pvc/daemon-common/vm.py

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#!/usr/bin/env python3
# vm.py - PVC client function library, VM fuctions
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2024 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################
import time
import re
import os.path
import lxml.objectify
import lxml.etree
from concurrent.futures import ThreadPoolExecutor
from datetime import datetime
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from distutils.util import strtobool
from json import dump as jdump
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from json import load as jload
from json import loads as jloads
from libvirt import open as lvopen
from os import scandir
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from shutil import rmtree
from socket import gethostname
from uuid import UUID
import daemon_lib.common as common
import daemon_lib.ceph as ceph
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from daemon_lib.network import set_sriov_vf_vm, unset_sriov_vf_vm
from daemon_lib.celery import start, update, fail, finish
#
# Cluster search functions
#
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def getClusterDomainList(zkhandler):
# Get a list of UUIDs by listing the children of /domains
uuid_list = zkhandler.children("base.domain")
name_list = []
# For each UUID, get the corresponding name from the data
for uuid in uuid_list:
name_list.append(zkhandler.read(("domain", uuid)))
return uuid_list, name_list
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def searchClusterByUUID(zkhandler, uuid):
try:
# Get the lists
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uuid_list, name_list = getClusterDomainList(zkhandler)
# We're looking for UUID, so find that element ID
index = uuid_list.index(uuid)
# Get the name_list element at that index
name = name_list[index]
except ValueError:
# We didn't find anything
return None
return name
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def searchClusterByName(zkhandler, name):
try:
# Get the lists
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uuid_list, name_list = getClusterDomainList(zkhandler)
# We're looking for name, so find that element ID
index = name_list.index(name)
# Get the uuid_list element at that index
uuid = uuid_list[index]
except ValueError:
# We didn't find anything
return None
return uuid
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def getDomainUUID(zkhandler, domain):
# Validate that VM exists in cluster
if common.validateUUID(domain):
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dom_name = searchClusterByUUID(zkhandler, domain)
dom_uuid = searchClusterByName(zkhandler, dom_name)
else:
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dom_uuid = searchClusterByName(zkhandler, domain)
dom_name = searchClusterByUUID(zkhandler, dom_uuid)
return dom_uuid
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def getDomainName(zkhandler, domain):
# Validate that VM exists in cluster
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if common.validateUUID(domain):
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dom_name = searchClusterByUUID(zkhandler, domain)
dom_uuid = searchClusterByName(zkhandler, dom_name)
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else:
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dom_uuid = searchClusterByName(zkhandler, domain)
dom_name = searchClusterByUUID(zkhandler, dom_uuid)
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return dom_name
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#
# Helper functions
#
def change_state(zkhandler, dom_uuid, new_state):
lock = zkhandler.exclusivelock(("domain.state", dom_uuid))
with lock:
zkhandler.write([(("domain.state", dom_uuid), new_state)])
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# Wait for 1/2 second to allow state to flow to all nodes
time.sleep(0.5)
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#
# Direct functions
#
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def is_migrated(zkhandler, domain):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
last_node = zkhandler.read(("domain.last_node", dom_uuid))
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if last_node:
return True
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else:
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return False
def define_vm(
zkhandler,
config_data,
target_node,
node_limit,
node_selector,
node_autostart,
migration_method=None,
migration_max_downtime=300,
profile=None,
tags=[],
initial_state="stop",
):
# Parse the XML data
try:
parsed_xml = lxml.objectify.fromstring(config_data)
except Exception as e:
return False, f"ERROR: Failed to parse XML data: {e}"
# Extract the required items from the XML document and error if not valid
next_field = 0
next_map = {
0: "uuid",
1: "name",
2: "memory",
3: "vcpu",
4: "networks",
5: "disks",
}
try:
dom_uuid = parsed_xml.uuid.text
next_field += 1
dom_name = parsed_xml.name.text
next_field += 1
parsed_memory = int(parsed_xml.memory.text)
next_field += 1
parsed_vcpu = int(parsed_xml.vcpu.text)
next_field += 1
dnetworks = common.getDomainNetworks(parsed_xml, {})
next_field += 1
ddisks = common.getDomainDisks(parsed_xml, {})
next_field += 1
except Exception as e:
return (
False,
f'ERROR: Failed to parse XML data: field data for "{next_map[next_field]}" is not valid: {e}',
)
# Ensure that the UUID and name are unique
if searchClusterByUUID(zkhandler, dom_uuid) or searchClusterByName(
zkhandler, dom_name
):
return (
False,
'ERROR: Specified VM "{}" or UUID "{}" matches an existing VM on the cluster'.format(
dom_name, dom_uuid
),
)
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if not target_node:
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target_node = common.findTargetNode(zkhandler, dom_uuid)
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else:
# Verify node is valid
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valid_node = common.verifyNode(zkhandler, target_node)
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if not valid_node:
return False, 'ERROR: Specified node "{}" is invalid.'.format(target_node)
# Validate the new RAM against the current active node
node_total_memory = int(zkhandler.read(("node.memory.total", target_node)))
if parsed_memory >= node_total_memory:
return (
False,
'ERROR: VM configuration specifies more memory ({} MiB) than node "{}" has available ({} MiB).'.format(
parsed_memory, target_node, node_total_memory
),
)
# Validate the number of vCPUs against the current active node
node_total_cpus = int(zkhandler.read(("node.data.static", target_node)).split()[0])
if parsed_vcpu >= (node_total_cpus - 2):
return (
False,
'ERROR: VM configuration specifies more vCPUs ({}) than node "{}" has available ({} minus 2).'.format(
parsed_vcpu, target_node, node_total_cpus
),
)
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# If a SR-IOV network device is being added, set its used state
for network in dnetworks:
if network["type"] in ["direct", "hostdev"]:
dom_node = zkhandler.read(("domain.node", dom_uuid))
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# Check if the network is already in use
is_used = zkhandler.read(
("node.sriov.vf", dom_node, "sriov_vf.used", network["source"])
)
if is_used == "True":
used_by_name = searchClusterByUUID(
zkhandler,
zkhandler.read(
(
"node.sriov.vf",
dom_node,
"sriov_vf.used_by",
network["source"],
)
),
)
return (
False,
'ERROR: Attempted to use SR-IOV network "{}" which is already used by VM "{}" on node "{}".'.format(
network["source"], used_by_name, dom_node
),
)
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# We must update the "used" section
set_sriov_vf_vm(
zkhandler,
dom_uuid,
dom_node,
network["source"],
network["mac"],
network["type"],
)
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# Obtain the RBD disk list using the common functions
rbd_list = []
for disk in ddisks:
if disk["type"] == "rbd":
rbd_list.append(disk["name"])
# Join the limit
if isinstance(node_limit, list) and node_limit:
formatted_node_limit = ",".join(node_limit)
else:
formatted_node_limit = ""
# Join the RBD list
if isinstance(rbd_list, list) and rbd_list:
formatted_rbd_list = ",".join(rbd_list)
else:
formatted_rbd_list = ""
# Add the new domain to Zookeeper
zkhandler.write(
[
(("domain", dom_uuid), dom_name),
(("domain.xml", dom_uuid), config_data),
(("domain.state", dom_uuid), initial_state),
(("domain.profile", dom_uuid), profile),
(("domain.stats", dom_uuid), ""),
(("domain.node", dom_uuid), target_node),
(("domain.last_node", dom_uuid), ""),
(("domain.failed_reason", dom_uuid), ""),
(("domain.storage.volumes", dom_uuid), formatted_rbd_list),
(("domain.console.log", dom_uuid), ""),
(("domain.console.vnc", dom_uuid), ""),
(("domain.meta.autostart", dom_uuid), node_autostart),
(("domain.meta.migrate_method", dom_uuid), str(migration_method).lower()),
(
("domain.meta.migrate_max_downtime", dom_uuid),
int(migration_max_downtime),
),
(("domain.meta.node_limit", dom_uuid), formatted_node_limit),
(("domain.meta.node_selector", dom_uuid), str(node_selector).lower()),
(("domain.meta.tags", dom_uuid), ""),
(("domain.migrate.sync_lock", dom_uuid), ""),
(("domain.snapshots", dom_uuid), ""),
]
)
for tag in tags:
tag_name = tag["name"]
zkhandler.write(
[
(("domain.meta.tags", dom_uuid, "tag.name", tag_name), tag["name"]),
(("domain.meta.tags", dom_uuid, "tag.type", tag_name), tag["type"]),
(
("domain.meta.tags", dom_uuid, "tag.protected", tag_name),
tag["protected"],
),
]
)
return True, 'Added new VM with Name "{}" and UUID "{}" to database.'.format(
dom_name, dom_uuid
)
def modify_vm_metadata(
zkhandler,
domain,
node_limit,
node_selector,
node_autostart,
provisioner_profile,
migration_method,
migration_max_downtime,
):
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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update_list = list()
if node_limit is not None:
update_list.append((("domain.meta.node_limit", dom_uuid), node_limit))
if node_selector is not None:
update_list.append(
(("domain.meta.node_selector", dom_uuid), str(node_selector).lower())
)
if node_autostart is not None:
update_list.append((("domain.meta.autostart", dom_uuid), node_autostart))
if provisioner_profile is not None:
update_list.append((("domain.profile", dom_uuid), provisioner_profile))
if migration_method is not None:
update_list.append(
(("domain.meta.migrate_method", dom_uuid), str(migration_method).lower())
)
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if migration_max_downtime is not None:
update_list.append(
(
("domain.meta.migrate_max_downtime", dom_uuid),
int(migration_max_downtime),
)
)
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if len(update_list) < 1:
return False, "ERROR: No updates to apply."
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zkhandler.write(update_list)
return True, 'Successfully modified PVC metadata of VM "{}".'.format(domain)
def modify_vm_tag(zkhandler, domain, action, tag, protected=False):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
if action == "add":
zkhandler.write(
[
(("domain.meta.tags", dom_uuid, "tag.name", tag), tag),
(("domain.meta.tags", dom_uuid, "tag.type", tag), "user"),
(("domain.meta.tags", dom_uuid, "tag.protected", tag), protected),
]
)
return True, 'Successfully added tag "{}" to VM "{}".'.format(tag, domain)
elif action == "remove":
if not zkhandler.exists(("domain.meta.tags", dom_uuid, "tag", tag)):
return False, 'The tag "{}" does not exist.'.format(tag)
if zkhandler.read(("domain.meta.tags", dom_uuid, "tag.type", tag)) != "user":
return (
False,
'The tag "{}" is not a user tag and cannot be removed.'.format(tag),
)
if bool(
strtobool(
zkhandler.read(("domain.meta.tags", dom_uuid, "tag.protected", tag))
)
):
return False, 'The tag "{}" is protected and cannot be removed.'.format(tag)
zkhandler.delete([(("domain.meta.tags", dom_uuid, "tag", tag))])
return True, 'Successfully removed tag "{}" from VM "{}".'.format(tag, domain)
else:
return False, "Specified tag action is not available."
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def modify_vm(zkhandler, domain, restart, new_vm_config):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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dom_name = getDomainName(zkhandler, domain)
# Parse and valiate the XML
try:
parsed_xml = lxml.objectify.fromstring(new_vm_config)
except Exception:
return False, "ERROR: Failed to parse new XML data."
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# Extract the required items from the XML document and error if not valid
next_field = 0
next_map = {
0: "uuid",
1: "name",
2: "memory",
3: "vcpu",
4: "networks",
5: "disks",
}
try:
dom_uuid = parsed_xml.uuid.text
next_field += 1
dom_name = parsed_xml.name.text
next_field += 1
parsed_memory = int(parsed_xml.memory.text)
next_field += 1
parsed_vcpu = int(parsed_xml.vcpu.text)
next_field += 1
dnetworks = common.getDomainNetworks(parsed_xml, {})
next_field += 1
ddisks = common.getDomainDisks(parsed_xml, {})
next_field += 1
except Exception as e:
return (
False,
f'ERROR: Failed to parse XML data: field data for "{next_map[next_field]}" is not valid: {e}',
)
# Get our old network list for comparison purposes
old_vm_config = zkhandler.read(("domain.xml", dom_uuid))
old_parsed_xml = lxml.objectify.fromstring(old_vm_config)
old_dnetworks = common.getDomainNetworks(old_parsed_xml, {})
# Validate the new RAM against the current active node
node_name = zkhandler.read(("domain.node", dom_uuid))
node_total_memory = int(zkhandler.read(("node.memory.total", node_name)))
if parsed_memory >= node_total_memory:
return (
False,
'ERROR: Updated VM configuration specifies more memory ({} MiB) than node "{}" has available ({} MiB).'.format(
parsed_memory, node_name, node_total_memory
),
)
# Validate the number of vCPUs against the current active node
node_total_cpus = int(zkhandler.read(("node.data.static", node_name)).split()[0])
if parsed_vcpu >= (node_total_cpus - 2):
return (
False,
'ERROR: Updated VM configuration specifies more vCPUs ({}) than node "{}" has available ({} minus 2).'.format(
parsed_vcpu, node_name, node_total_cpus
),
)
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# If a SR-IOV network device is being added, set its used state
for network in dnetworks:
# Ignore networks that are already there
if network["source"] in [net["source"] for net in old_dnetworks]:
continue
if network["type"] in ["direct", "hostdev"]:
dom_node = zkhandler.read(("domain.node", dom_uuid))
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# Check if the network is already in use
is_used = zkhandler.read(
("node.sriov.vf", dom_node, "sriov_vf.used", network["source"])
)
if is_used == "True":
used_by_name = searchClusterByUUID(
zkhandler,
zkhandler.read(
(
"node.sriov.vf",
dom_node,
"sriov_vf.used_by",
network["source"],
)
),
)
return (
False,
'ERROR: Attempted to use SR-IOV network "{}" which is already used by VM "{}" on node "{}".'.format(
network["source"], used_by_name, dom_node
),
)
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# We must update the "used" section
set_sriov_vf_vm(
zkhandler,
dom_uuid,
dom_node,
network["source"],
network["mac"],
network["type"],
)
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# If a SR-IOV network device is being removed, unset its used state
for network in old_dnetworks:
if network["type"] in ["direct", "hostdev"]:
if network["mac"] not in [n["mac"] for n in dnetworks]:
dom_node = zkhandler.read(("domain.node", dom_uuid))
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# We must update the "used" section
unset_sriov_vf_vm(zkhandler, dom_node, network["source"])
# Obtain the RBD disk list using the common functions
rbd_list = []
for disk in ddisks:
if disk["type"] == "rbd":
rbd_list.append(disk["name"])
# Join the RBD list
if isinstance(rbd_list, list) and rbd_list:
formatted_rbd_list = ",".join(rbd_list)
else:
formatted_rbd_list = ""
# Add the modified config to Zookeeper
zkhandler.write(
[
(("domain", dom_uuid), dom_name),
(("domain.storage.volumes", dom_uuid), formatted_rbd_list),
(("domain.xml", dom_uuid), new_vm_config),
]
)
if restart:
change_state(zkhandler, dom_uuid, "restart")
return True, 'Successfully modified configuration of VM "{}".'.format(domain)
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def dump_vm(zkhandler, domain):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
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return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Gram the domain XML and dump it to stdout
vm_xml = zkhandler.read(("domain.xml", dom_uuid))
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return True, vm_xml
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def rename_vm(zkhandler, domain, new_domain):
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Verify that the VM is in a stopped state; renaming is not supported otherwise
state = zkhandler.read(("domain.state", dom_uuid))
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if state not in ["stop", "disable"]:
return (
False,
'ERROR: VM "{}" is not in stopped state; VMs cannot be renamed while running.'.format(
domain
),
)
# Parse and valiate the XML
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vm_config = common.getDomainXML(zkhandler, dom_uuid)
# Obtain the RBD disk list using the common functions
ddisks = common.getDomainDisks(vm_config, {})
pool_list = []
rbd_list = []
for disk in ddisks:
if disk["type"] == "rbd":
pool_list.append(disk["name"].split("/")[0])
rbd_list.append(disk["name"].split("/")[1])
# Rename each volume in turn
for idx, rbd in enumerate(rbd_list):
rbd_new = re.sub(r"{}".format(domain), new_domain, rbd)
# Skip renaming if nothing changed
if rbd_new == rbd:
continue
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ceph.rename_volume(zkhandler, pool_list[idx], rbd, rbd_new)
# Replace the name in the config
vm_config_new = (
lxml.etree.tostring(vm_config, encoding="ascii", method="xml")
.decode()
.replace(domain, new_domain)
)
# Get VM information
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_b, dom_info = get_info(zkhandler, dom_uuid)
# Undefine the old VM
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undefine_vm(zkhandler, dom_uuid)
# Define the new VM
define_vm(
zkhandler,
vm_config_new,
dom_info["node"],
dom_info["node_limit"],
dom_info["node_selector"],
dom_info["node_autostart"],
migration_method=dom_info["migration_method"],
migration_max_downtime=dom_info["migration_max_downtime"],
profile=dom_info["profile"],
tags=dom_info["tags"],
initial_state="stop",
)
# If the VM is migrated, store that
if dom_info["migrated"] != "no":
zkhandler.write([(("domain.last_node", dom_uuid), dom_info["last_node"])])
return True, 'Successfully renamed VM "{}" to "{}".'.format(domain, new_domain)
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def undefine_vm(zkhandler, domain):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Shut down the VM
current_vm_state = zkhandler.read(("domain.state", dom_uuid))
if current_vm_state != "stop":
change_state(zkhandler, dom_uuid, "stop")
# Gracefully terminate the class instances
change_state(zkhandler, dom_uuid, "delete")
# Delete the configurations
zkhandler.delete([("domain", dom_uuid)])
return True, 'Undefined VM "{}" from the cluster.'.format(domain)
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def remove_vm(zkhandler, domain):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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disk_list = common.getDomainDiskList(zkhandler, dom_uuid)
# Shut down the VM
current_vm_state = zkhandler.read(("domain.state", dom_uuid))
if current_vm_state != "stop":
change_state(zkhandler, dom_uuid, "stop")
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# Wait for 1 second to allow state to flow to all nodes
time.sleep(1)
# Remove disks
for disk in disk_list:
# vmpool/vmname_volume
try:
disk_pool, disk_name = disk.split("/")
except ValueError:
continue
retcode, message = ceph.remove_volume(zkhandler, disk_pool, disk_name)
if not retcode:
if re.match("^ERROR: No volume with name", message):
continue
else:
return False, message
# Gracefully terminate the class instances
change_state(zkhandler, dom_uuid, "delete")
# Wait for 1/2 second to allow state to flow to all nodes
time.sleep(0.5)
# Delete the VM configuration from Zookeeper
zkhandler.delete([("domain", dom_uuid)])
return True, 'Removed VM "{}" and its disks from the cluster.'.format(domain)
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def start_vm(zkhandler, domain):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Set the VM to start
change_state(zkhandler, dom_uuid, "start")
return True, 'Starting VM "{}".'.format(domain)
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def restart_vm(zkhandler, domain, wait=False):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get state and verify we're OK to proceed
current_state = zkhandler.read(("domain.state", dom_uuid))
if current_state != "start":
return False, 'ERROR: VM "{}" is not in "start" state!'.format(domain)
retmsg = 'Restarting VM "{}".'.format(domain)
# Set the VM to restart
change_state(zkhandler, dom_uuid, "restart")
if wait:
while zkhandler.read(("domain.state", dom_uuid)) == "restart":
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time.sleep(0.5)
retmsg = 'Restarted VM "{}"'.format(domain)
return True, retmsg
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def shutdown_vm(zkhandler, domain, wait=False):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get state and verify we're OK to proceed
current_state = zkhandler.read(("domain.state", dom_uuid))
if current_state != "start":
return False, 'ERROR: VM "{}" is not in "start" state!'.format(domain)
retmsg = 'Shutting down VM "{}"'.format(domain)
# Set the VM to shutdown
change_state(zkhandler, dom_uuid, "shutdown")
if wait:
while zkhandler.read(("domain.state", dom_uuid)) == "shutdown":
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time.sleep(0.5)
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retmsg = 'Shut down VM "{}"'.format(domain)
return True, retmsg
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def stop_vm(zkhandler, domain):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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# Set the VM to stop
change_state(zkhandler, dom_uuid, "stop")
return True, 'Forcibly stopping VM "{}".'.format(domain)
def disable_vm(zkhandler, domain, force=False):
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# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get state and perform a shutdown/stop if VM is online
current_state = zkhandler.read(("domain.state", dom_uuid))
if current_state in ["start"]:
if force:
change_state(zkhandler, dom_uuid, "stop")
# Wait for the command to be registered by the node
time.sleep(0.5)
else:
change_state(zkhandler, dom_uuid, "shutdown")
# Wait for the shutdown to complete
while zkhandler.read(("domain.state", dom_uuid)) != "stop":
time.sleep(0.5)
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# Set the VM to disable
change_state(zkhandler, dom_uuid, "disable")
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return True, 'Disabled VM "{}".'.format(domain)
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def update_vm_sriov_nics(zkhandler, dom_uuid, source_node, target_node):
# Update all the SR-IOV device states on both nodes, used during migrations but called by the node-side
vm_config = zkhandler.read(("domain.xml", dom_uuid))
parsed_xml = lxml.objectify.fromstring(vm_config)
# Extract the required items from the XML document and error if not valid
try:
dnetworks = common.getDomainNetworks(parsed_xml, {})
except Exception as e:
return (
False,
f'ERROR: Failed to parse XML data: field data for "networks" is not valid: {e}',
)
retcode = True
retmsg = ""
for network in dnetworks:
if network["type"] in ["direct", "hostdev"]:
# Check if the network is already in use
is_used = zkhandler.read(
("node.sriov.vf", target_node, "sriov_vf.used", network["source"])
)
if is_used == "True":
used_by_name = searchClusterByUUID(
zkhandler,
zkhandler.read(
(
"node.sriov.vf",
target_node,
"sriov_vf.used_by",
network["source"],
)
),
)
if retcode:
retcode_this = False
retmsg = 'Attempting to use SR-IOV network "{}" which is already used by VM "{}"'.format(
network["source"], used_by_name
)
else:
retcode_this = True
# We must update the "used" section
if retcode_this:
# This conditional ensure that if we failed the is_used check, we don't try to overwrite the information of a VF that belongs to another VM
set_sriov_vf_vm(
zkhandler,
dom_uuid,
target_node,
network["source"],
network["mac"],
network["type"],
)
# ... but we still want to free the old node in an case
unset_sriov_vf_vm(zkhandler, source_node, network["source"])
if not retcode_this:
retcode = retcode_this
return retcode, retmsg
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def move_vm(zkhandler, domain, target_node, wait=False, force_live=False):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get state and verify we're OK to proceed
current_state = zkhandler.read(("domain.state", dom_uuid))
if current_state != "start":
# If the current state isn't start, preserve it; we're not doing live migration
target_state = current_state
else:
if force_live:
target_state = "migrate-live"
else:
target_state = "migrate"
current_node = zkhandler.read(("domain.node", dom_uuid))
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if not target_node:
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target_node = common.findTargetNode(zkhandler, dom_uuid)
else:
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# Verify node is valid
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valid_node = common.verifyNode(zkhandler, target_node)
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if not valid_node:
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return False, 'ERROR: Specified node "{}" is invalid.'.format(target_node)
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# Check if node is within the limit
node_limit = zkhandler.read(("domain.meta.node_limit", dom_uuid))
if node_limit and target_node not in node_limit.split(","):
return (
False,
'ERROR: Specified node "{}" is not in the allowed list of nodes for VM "{}".'.format(
target_node, domain
),
)
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# Verify if node is current node
if target_node == current_node:
last_node = zkhandler.read(("domain.last_node", dom_uuid))
if last_node:
zkhandler.write([(("domain.last_node", dom_uuid), "")])
return True, 'Making temporary migration permanent for VM "{}".'.format(
domain
)
return False, 'ERROR: VM "{}" is already running on node "{}".'.format(
domain, current_node
)
if not target_node:
return (
False,
'ERROR: Could not find a valid migration target for VM "{}".'.format(
domain
),
)
retmsg = 'Permanently migrating VM "{}" to node "{}".'.format(domain, target_node)
lock = zkhandler.exclusivelock(("domain.state", dom_uuid))
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with lock:
zkhandler.write(
[
(("domain.state", dom_uuid), target_state),
(("domain.node", dom_uuid), target_node),
(("domain.last_node", dom_uuid), ""),
]
)
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# Wait for 1/2 second for migration to start
time.sleep(0.5)
# Update any SR-IOV NICs
update_vm_sriov_nics(zkhandler, dom_uuid, current_node, target_node)
if wait:
while zkhandler.read(("domain.state", dom_uuid)) == target_state:
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time.sleep(0.5)
retmsg = 'Permanently migrated VM "{}" to node "{}"'.format(domain, target_node)
return True, retmsg
def migrate_vm(
zkhandler, domain, target_node, force_migrate, wait=False, force_live=False
):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get state and verify we're OK to proceed
current_state = zkhandler.read(("domain.state", dom_uuid))
if current_state != "start":
# If the current state isn't start, preserve it; we're not doing live migration
target_state = current_state
else:
if force_live:
target_state = "migrate-live"
else:
target_state = "migrate"
current_node = zkhandler.read(("domain.node", dom_uuid))
last_node = zkhandler.read(("domain.last_node", dom_uuid))
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if last_node and not force_migrate:
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return False, 'ERROR: VM "{}" has been previously migrated.'.format(domain)
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if not target_node:
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target_node = common.findTargetNode(zkhandler, dom_uuid)
else:
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# Verify node is valid
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valid_node = common.verifyNode(zkhandler, target_node)
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if not valid_node:
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return False, 'ERROR: Specified node "{}" is invalid.'.format(target_node)
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# Check if node is within the limit
node_limit = zkhandler.read(("domain.meta.node_limit", dom_uuid))
if node_limit and target_node not in node_limit.split(","):
return (
False,
'ERROR: Specified node "{}" is not in the allowed list of nodes for VM "{}".'.format(
target_node, domain
),
)
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# Verify if node is current node
if target_node == current_node:
return False, 'ERROR: VM "{}" is already running on node "{}".'.format(
domain, current_node
)
if not target_node:
return (
False,
'ERROR: Could not find a valid migration target for VM "{}".'.format(
domain
),
)
# Don't overwrite an existing last_node when using force_migrate
real_current_node = current_node # Used for the SR-IOV update
if last_node and force_migrate:
current_node = last_node
retmsg = 'Migrating VM "{}" to node "{}".'.format(domain, target_node)
lock = zkhandler.exclusivelock(("domain.state", dom_uuid))
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with lock:
zkhandler.write(
[
(("domain.state", dom_uuid), target_state),
(("domain.node", dom_uuid), target_node),
(("domain.last_node", dom_uuid), current_node),
]
)
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# Wait for 1/2 second for migration to start
time.sleep(0.5)
# Update any SR-IOV NICs
update_vm_sriov_nics(zkhandler, dom_uuid, real_current_node, target_node)
if wait:
while zkhandler.read(("domain.state", dom_uuid)) == target_state:
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time.sleep(0.5)
retmsg = 'Migrated VM "{}" to node "{}"'.format(domain, target_node)
return True, retmsg
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def unmigrate_vm(zkhandler, domain, wait=False, force_live=False):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get state and verify we're OK to proceed
current_state = zkhandler.read(("domain.state", dom_uuid))
if current_state != "start":
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# If the current state isn't start, preserve it; we're not doing live migration
target_state = current_state
else:
if force_live:
target_state = "migrate-live"
else:
target_state = "migrate"
current_node = zkhandler.read(("domain.node", dom_uuid))
target_node = zkhandler.read(("domain.last_node", dom_uuid))
if target_node == "":
return False, 'ERROR: VM "{}" has not been previously migrated.'.format(domain)
retmsg = 'Unmigrating VM "{}" back to node "{}".'.format(domain, target_node)
lock = zkhandler.exclusivelock(("domain.state", dom_uuid))
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with lock:
zkhandler.write(
[
(("domain.state", dom_uuid), target_state),
(("domain.node", dom_uuid), target_node),
(("domain.last_node", dom_uuid), ""),
]
)
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# Wait for 1/2 second for migration to start
time.sleep(0.5)
# Update any SR-IOV NICs
update_vm_sriov_nics(zkhandler, dom_uuid, current_node, target_node)
if wait:
while zkhandler.read(("domain.state", dom_uuid)) == target_state:
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time.sleep(0.5)
retmsg = 'Unmigrated VM "{}" back to node "{}"'.format(domain, target_node)
return True, retmsg
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def get_console_log(zkhandler, domain, lines=1000):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Get the data from ZK
console_log = zkhandler.read(("domain.console.log", dom_uuid))
if console_log is None:
return True, ""
# Shrink the log buffer to length lines
shrunk_log = console_log.split("\n")[-lines:]
loglines = "\n".join(shrunk_log)
return True, loglines
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def get_info(zkhandler, domain):
# Validate that VM exists in cluster
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dom_uuid = getDomainUUID(zkhandler, domain)
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if not dom_uuid:
return False, 'ERROR: No VM named "{}" is present in the cluster.'.format(
domain
)
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# Gather information from XML config and print it
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domain_information = common.getInformationFromXML(zkhandler, dom_uuid)
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if not domain_information:
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return False, 'ERROR: Could not get information about VM "{}".'.format(domain)
return True, domain_information
def get_list(
zkhandler, node=None, state=None, tag=None, limit=None, is_fuzzy=True, negate=False
):
if node is not None:
# Verify node is valid
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if not common.verifyNode(zkhandler, node):
return False, 'Specified node "{}" is invalid.'.format(node)
if state is not None:
valid_states = [
"start",
"restart",
"shutdown",
"stop",
"disable",
"fail",
"migrate",
"unmigrate",
"provision",
]
if state not in valid_states:
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return False, 'VM state "{}" is not valid.'.format(state)
full_vm_list = zkhandler.children("base.domain")
full_vm_list.sort()
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# Set our limit to a sensible regex
if limit is not None:
# Check if the limit is a UUID
is_limit_uuid = False
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try:
uuid_obj = UUID(limit, version=4)
limit = str(uuid_obj)
is_limit_uuid = True
except ValueError:
pass
if is_fuzzy and not is_limit_uuid:
try:
# Implcitly assume fuzzy limits
if not re.match(r"\^.*", limit):
limit = ".*" + limit
if not re.match(r".*\$", limit):
limit = limit + ".*"
except Exception as e:
return False, "Regex Error: {}".format(e)
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get_vm_info = dict()
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for vm in full_vm_list:
name = zkhandler.read(("domain", vm))
is_limit_match = False
is_tag_match = False
is_node_match = False
is_state_match = False
# Check on limit
if limit is not None:
# Try to match the limit against the UUID (if applicable) and name
try:
if is_limit_uuid and re.fullmatch(limit, vm):
is_limit_match = True
if re.fullmatch(limit, name):
is_limit_match = True
except Exception as e:
return False, "Regex Error: {}".format(e)
else:
is_limit_match = True
if tag is not None:
vm_tags = zkhandler.children(("domain.meta.tags", vm))
if negate and tag not in vm_tags:
is_tag_match = True
if not negate and tag in vm_tags:
is_tag_match = True
else:
is_tag_match = True
# Check on node
if node is not None:
vm_node = zkhandler.read(("domain.node", vm))
if negate and vm_node != node:
is_node_match = True
if not negate and vm_node == node:
is_node_match = True
else:
is_node_match = True
# Check on state
if state is not None:
vm_state = zkhandler.read(("domain.state", vm))
if negate and vm_state != state:
is_state_match = True
if not negate and vm_state == state:
is_state_match = True
else:
is_state_match = True
get_vm_info[vm] = (
True
if is_limit_match and is_tag_match and is_node_match and is_state_match
else False
)
# Obtain our VM data in a thread pool
# This helps parallelize the numerous Zookeeper calls a bit, within the bounds of the GIL, and
# should help prevent this task from becoming absurdly slow with very large numbers of VMs.
# The max_workers is capped at 32 to avoid creating an absurd number of threads especially if
# the list gets called multiple times simultaneously by the API, but still provides a noticeable
# speedup.
vm_execute_list = [vm for vm in full_vm_list if get_vm_info[vm]]
vm_data_list = list()
with ThreadPoolExecutor(max_workers=32, thread_name_prefix="vm_list") as executor:
futures = []
for vm_uuid in vm_execute_list:
futures.append(
executor.submit(common.getInformationFromXML, zkhandler, vm_uuid)
)
for future in futures:
try:
vm_data_list.append(future.result())
except Exception:
pass
return True, sorted(vm_data_list, key=lambda d: d["name"])
#
# VM Snapshot Tasks
#
def create_vm_snapshot(zkhandler, domain, snapshot_name=None):
# Validate that VM exists in cluster
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
if snapshot_name is None:
now = datetime.now()
snapshot_name = now.strftime("%Y%m%d%H%M%S")
else:
reg = re.compile("^[a-z0-9.-_]+$")
if not reg.match(snapshot_name):
return (
False,
f'ERROR: Snapshot name "{snapshot_name}" contains invalid characters; only alphanumeric, ".", "-", and "_" characters are allowed!',
)
current_snapshots = zkhandler.children(("domain.snapshots", dom_uuid))
if current_snapshots and snapshot_name in current_snapshots:
return (
False,
f'ERROR: Snapshot name "{snapshot_name}" already exists for VM "{domain}"!',
)
tstart = time.time()
# Get the list of all RBD volumes
rbd_list = zkhandler.read(("domain.storage.volumes", dom_uuid)).split(",")
snap_list = list()
# If a snapshot fails, clean up any snapshots that were successfuly created
def cleanup_failure():
for snapshot in snap_list:
rbd, snapshot_name = snapshot.split("@")
pool, volume = rbd.split("/")
# We capture no output here, because if this fails too we're in a deep
# error chain and will just ignore it
ceph.remove_snapshot(zkhandler, pool, volume, snapshot_name)
# Iterrate through and create a snapshot for each RBD volume
for rbd in rbd_list:
pool, volume = rbd.split("/")
ret, msg = ceph.add_snapshot(zkhandler, pool, volume, snapshot_name)
if not ret:
cleanup_failure()
return False, msg
else:
snap_list.append(f"{pool}/{volume}@{snapshot_name}")
# Get the current domain XML
vm_config = zkhandler.read(("domain.xml", dom_uuid))
# Add the snapshot entry to Zookeeper
zkhandler.write(
[
(
(
"domain.snapshots",
dom_uuid,
"domain_snapshot.name",
snapshot_name,
),
snapshot_name,
),
(
(
"domain.snapshots",
dom_uuid,
"domain_snapshot.timestamp",
snapshot_name,
),
tstart,
),
(
(
"domain.snapshots",
dom_uuid,
"domain_snapshot.xml",
snapshot_name,
),
vm_config,
),
(
(
"domain.snapshots",
dom_uuid,
"domain_snapshot.rbd_snapshots",
snapshot_name,
),
",".join(snap_list),
),
]
)
tend = time.time()
ttot = round(tend - tstart, 2)
return (
True,
f'Successfully created snapshot "{snapshot_name}" of VM "{domain}" in {ttot}s.',
)
def remove_vm_snapshot(zkhandler, domain, snapshot_name):
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# Validate that VM exists in cluster
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
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if not zkhandler.exists(
("domain.snapshots", dom_uuid, "domain_snapshot.name", snapshot_name)
):
return (
False,
f'ERROR: Could not find snapshot "{snapshot_name}" of VM "{domain}"!',
)
tstart = time.time()
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_snapshots = zkhandler.read(
("domain.snapshots", dom_uuid, "domain_snapshot.rbd_snapshots", snapshot_name)
)
rbd_snapshots = _snapshots.split(",")
for snap in rbd_snapshots:
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rbd, name = snap.split("@")
pool, volume = rbd.split("/")
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ret, msg = ceph.remove_snapshot(zkhandler, pool, volume, name)
if not ret:
return False, msg
ret = zkhandler.delete(
("domain.snapshots", dom_uuid, "domain_snapshot.name", snapshot_name)
)
if not ret:
return (
False,
f'ERROR: Failed to delete snapshot "{snapshot_name}" of VM "{domain}" in Zookeeper.',
)
tend = time.time()
ttot = round(tend - tstart, 2)
return (
True,
f'Successfully removed snapshot "{snapshot_name}" of VM "{domain}" in {ttot}s.',
)
def rollback_vm_snapshot(zkhandler, domain, snapshot_name):
pass
#
# VM Backup Tasks
#
def backup_vm(
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zkhandler, domain, backup_path, incremental_parent=None, retain_snapshot=False
):
# 0a. Set datestring in YYYYMMDDHHMMSS format
now = datetime.now()
datestring = now.strftime("%Y%m%d%H%M%S")
snapshot_name = f"backup_{datestring}"
# 0b. Validations part 1
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# Validate that the target path is valid
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if not re.match(r"^/", backup_path):
return (
False,
f"ERROR in backup {datestring}: Target path {backup_path} is not a valid absolute path on the primary coordinator!",
)
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# Ensure that backup_path (on this node) exists
if not os.path.isdir(backup_path):
return (
False,
f"ERROR in backup {datestring}: Target path {backup_path} does not exist!",
)
# 1a. Create destination directory
vm_target_root = f"{backup_path}/{domain}"
vm_target_backup = f"{backup_path}/{domain}/{datestring}/pvcdisks"
if not os.path.isdir(vm_target_backup):
try:
os.makedirs(vm_target_backup)
except Exception as e:
return (
False,
f"ERROR in backup {datestring}: Failed to create backup directory: {e}",
)
tstart = time.time()
backup_type = "incremental" if incremental_parent is not None else "full"
# 1b. Prepare backup JSON write (it will write on any result
def write_pvcbackup_json(
result=False,
result_message="",
vm_detail=None,
backup_files=None,
backup_files_size=0,
ttot=None,
):
if ttot is None:
tend = time.time()
ttot = round(tend - tstart, 2)
backup_details = {
"type": backup_type,
"datestring": datestring,
"incremental_parent": incremental_parent,
"retained_snapshot": retain_snapshot,
"result": result,
"result_message": result_message,
"runtime_secs": ttot,
"vm_detail": vm_detail,
"backup_files": backup_files,
"backup_size_bytes": backup_files_size,
}
with open(f"{vm_target_root}/{datestring}/pvcbackup.json", "w") as fh:
jdump(backup_details, fh)
# 2. Validations part 2
# Disallow retaining snapshots with an incremental parent
if incremental_parent is not None and retain_snapshot:
error_message = "Retaining snapshots of incremental backups is not supported!"
write_pvcbackup_json(result=False, result_message=f"ERROR: {error_message}")
return (
False,
f"ERROR in backup {datestring}: {error_message}",
)
# Validate that VM exists in cluster
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
error_message = f'Could not find VM "{domain}" in the cluster!'
write_pvcbackup_json(result=False, result_message=f"ERROR: {error_message}")
return False, f"ERROR in backup {datestring}: {error_message}"
# 3. Get information about VM
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vm_detail = get_list(zkhandler, limit=dom_uuid, is_fuzzy=False)[1][0]
if not isinstance(vm_detail, dict):
error_message = f"VM listing returned invalid data: {vm_detail}"
write_pvcbackup_json(result=False, result_message=f"ERROR: {error_message}")
return False, f"ERROR in backup {datestring}: {error_message}"
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vm_volumes = list()
for disk in vm_detail["disks"]:
if disk["type"] != "rbd":
continue
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pool, volume = disk["name"].split("/")
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retcode, retdata = ceph.get_list_volume(zkhandler, pool, volume, is_fuzzy=False)
if not retcode or len(retdata) != 1:
if len(retdata) < 1:
retdata = "No volumes returned."
elif len(retdata) > 1:
retdata = "Multiple volumes returned."
error_message = (
f"Failed to get volume details for {pool}/{volume}: {retdata}"
)
write_pvcbackup_json(
result=False,
result_message=f"ERROR: {error_message}",
vm_detail=vm_detail,
)
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return (
False,
f"ERROR in backup {datestring}: {error_message}",
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)
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try:
size = retdata[0]["stats"]["size"]
except Exception as e:
error_message = f"Failed to get volume size for {pool}/{volume}: {e}"
write_pvcbackup_json(
result=False,
result_message=f"ERROR: {error_message}",
vm_detail=vm_detail,
)
return (
False,
f"ERROR in backup {datestring}: {error_message}",
)
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vm_volumes.append((pool, volume, size))
# 4a. Validate that all volumes exist (they should, but just in case)
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for pool, volume, _ in vm_volumes:
if not ceph.verifyVolume(zkhandler, pool, volume):
error_message = f"VM defines a volume {pool}/{volume} which does not exist!"
write_pvcbackup_json(
result=False,
result_message=f"ERROR: {error_message}",
vm_detail=vm_detail,
)
return (
False,
f"ERROR in backup {datestring}: {error_message}",
)
# 4b. Validate that, if an incremental_parent is given, it is valid
# The incremental parent is just a datestring
if incremental_parent is not None:
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for pool, volume, _ in vm_volumes:
if not ceph.verifySnapshot(
zkhandler, pool, volume, f"backup_{incremental_parent}"
):
error_message = f"Incremental parent {incremental_parent} given, but no snapshots were found; cannot export an incremental backup."
write_pvcbackup_json(
result=False,
result_message=f"ERROR: {error_message}",
vm_detail=vm_detail,
)
return (
False,
f"ERROR in backup {datestring}: {error_message}",
)
export_fileext = "rbddiff"
else:
export_fileext = "rbdimg"
# 4c. Validate that there's enough space on the target
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# TODO
# 5. Take snapshot of each disks with the name @backup_{datestring}
is_snapshot_create_failed = False
which_snapshot_create_failed = list()
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for pool, volume, _ in vm_volumes:
retcode, retmsg = ceph.add_snapshot(zkhandler, pool, volume, snapshot_name)
if not retcode:
is_snapshot_create_failed = True
which_snapshot_create_failed.append(f"{pool}/{volume}")
if is_snapshot_create_failed:
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for pool, volume, _ in vm_volumes:
if ceph.verifySnapshot(zkhandler, pool, volume, snapshot_name):
ceph.remove_snapshot(zkhandler, pool, volume, snapshot_name)
error_message = f'Failed to create snapshot for volume(s) {", ".join(which_snapshot_create_failed)}'
write_pvcbackup_json(
result=False,
result_message=f"ERROR: {error_message}",
vm_detail=vm_detail,
)
return (
False,
f"ERROR in backup {datestring}: {error_message}",
)
# 6. Dump snapshot to folder with `rbd export` (full) or `rbd export-diff` (incremental)
is_snapshot_export_failed = False
which_snapshot_export_failed = list()
backup_files = list()
for pool, volume, size in vm_volumes:
if incremental_parent is not None:
incremental_parent_snapshot_name = f"backup_{incremental_parent}"
retcode, stdout, stderr = common.run_os_command(
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f"rbd export-diff --from-snap {incremental_parent_snapshot_name} {pool}/{volume}@{snapshot_name} {vm_target_backup}/{pool}.{volume}.{export_fileext}"
)
if retcode:
is_snapshot_export_failed = True
which_snapshot_export_failed.append(f"{pool}/{volume}")
else:
backup_files.append(
(f"pvcdisks/{pool}.{volume}.{export_fileext}", size)
)
else:
retcode, stdout, stderr = common.run_os_command(
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f"rbd export --export-format 2 {pool}/{volume}@{snapshot_name} {vm_target_backup}/{pool}.{volume}.{export_fileext}"
)
if retcode:
is_snapshot_export_failed = True
which_snapshot_export_failed.append(f"{pool}/{volume}")
else:
backup_files.append(
(f"pvcdisks/{pool}.{volume}.{export_fileext}", size)
)
def get_dir_size(path):
total = 0
with scandir(path) as it:
for entry in it:
if entry.is_file():
total += entry.stat().st_size
elif entry.is_dir():
total += get_dir_size(entry.path)
return total
backup_files_size = get_dir_size(vm_target_backup)
if is_snapshot_export_failed:
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for pool, volume, _ in vm_volumes:
if ceph.verifySnapshot(zkhandler, pool, volume, snapshot_name):
ceph.remove_snapshot(zkhandler, pool, volume, snapshot_name)
error_message = f'Failed to export snapshot for volume(s) {", ".join(which_snapshot_export_failed)}'
write_pvcbackup_json(
result=False,
result_message=f"ERROR: {error_message}",
vm_detail=vm_detail,
backup_files=backup_files,
backup_files_size=backup_files_size,
)
return (
False,
f"ERROR in backup {datestring}: {error_message}",
)
# 8. Remove snapshots if retain_snapshot is False
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is_snapshot_remove_failed = False
which_snapshot_remove_failed = list()
if not retain_snapshot:
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for pool, volume, _ in vm_volumes:
if ceph.verifySnapshot(zkhandler, pool, volume, snapshot_name):
retcode, retmsg = ceph.remove_snapshot(
zkhandler, pool, volume, snapshot_name
)
if not retcode:
is_snapshot_remove_failed = True
which_snapshot_remove_failed.append(f"{pool}/{volume}")
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tend = time.time()
ttot = round(tend - tstart, 2)
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retlines = list()
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if is_snapshot_remove_failed:
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retlines.append(
f"WARNING: Failed to remove snapshot(s) as requested for volume(s) {', '.join(which_snapshot_remove_failed)}"
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)
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myhostname = gethostname().split(".")[0]
if retain_snapshot:
result_message = f"Successfully backed up VM '{domain}' ({backup_type}@{datestring}, snapshots retained) to '{myhostname}:{backup_path}' in {ttot}s."
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else:
result_message = f"Successfully backed up VM '{domain}' ({backup_type}@{datestring}) to '{myhostname}:{backup_path}' in {ttot}s."
retlines.append(result_message)
write_pvcbackup_json(
result=True,
result_message=result_message,
vm_detail=vm_detail,
backup_files=backup_files,
backup_files_size=backup_files_size,
ttot=ttot,
)
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return True, "\n".join(retlines)
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def remove_backup(zkhandler, domain, backup_path, datestring):
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tstart = time.time()
# 0. Validation
# Validate that VM exists in cluster
dom_uuid = getDomainUUID(zkhandler, domain)
if not dom_uuid:
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Validate that the source path is valid
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if not re.match(r"^/", backup_path):
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return (
False,
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f"ERROR: Source path {backup_path} is not a valid absolute path on the primary coordinator!",
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)
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# Ensure that backup_path (on this node) exists
if not os.path.isdir(backup_path):
return False, f"ERROR: Source path {backup_path} does not exist!"
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# Ensure that domain path (on this node) exists
vm_backup_path = f"{backup_path}/{domain}"
if not os.path.isdir(vm_backup_path):
return False, f"ERROR: Source VM path {vm_backup_path} does not exist!"
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# Ensure that the archives are present
backup_source_pvcbackup_file = f"{vm_backup_path}/{datestring}/pvcbackup.json"
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if not os.path.isfile(backup_source_pvcbackup_file):
return False, "ERROR: The specified source backup files do not exist!"
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backup_source_pvcdisks_path = f"{vm_backup_path}/{datestring}/pvcdisks"
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if not os.path.isdir(backup_source_pvcdisks_path):
return False, "ERROR: The specified source backup files do not exist!"
# 1. Read the backup file and get VM details
try:
with open(backup_source_pvcbackup_file) as fh:
backup_source_details = jload(fh)
except Exception as e:
return False, f"ERROR: Failed to read source backup details: {e}"
# 2. Remove snapshots
is_snapshot_remove_failed = False
which_snapshot_remove_failed = list()
if backup_source_details["retained_snapshot"]:
for volume_file, _ in backup_source_details.get("backup_files"):
pool, volume, _ = volume_file.split("/")[-1].split(".")
snapshot = f"backup_{datestring}"
retcode, retmsg = ceph.remove_snapshot(zkhandler, pool, volume, snapshot)
if not retcode:
is_snapshot_remove_failed = True
which_snapshot_remove_failed.append(f"{pool}/{volume}")
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# 3. Remove files
is_files_remove_failed = False
msg_files_remove_failed = None
try:
rmtree(f"{vm_backup_path}/{datestring}")
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except Exception as e:
is_files_remove_failed = True
msg_files_remove_failed = e
tend = time.time()
ttot = round(tend - tstart, 2)
retlines = list()
if is_snapshot_remove_failed:
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retlines.append(
f"WARNING: Failed to remove snapshot(s) as requested for volume(s) {', '.join(which_snapshot_remove_failed)}"
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)
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if is_files_remove_failed:
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retlines.append(
f"WARNING: Failed to remove backup file(s) from {backup_path}: {msg_files_remove_failed}"
)
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myhostname = gethostname().split(".")[0]
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retlines.append(
f"Removed VM backup {datestring} for '{domain}' from '{myhostname}:{backup_path}' in {ttot}s."
)
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return True, "\n".join(retlines)
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def restore_vm(zkhandler, domain, backup_path, datestring, retain_snapshot=False):
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tstart = time.time()
# 0. Validations
# Validate that VM does not exist in cluster
dom_uuid = getDomainUUID(zkhandler, domain)
if dom_uuid:
return (
False,
f'ERROR: VM "{domain}" already exists in the cluster! Remove or rename it before restoring a backup.',
)
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# Validate that the source path is valid
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if not re.match(r"^/", backup_path):
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return (
False,
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f"ERROR: Source path {backup_path} is not a valid absolute path on the primary coordinator!",
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)
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# Ensure that backup_path (on this node) exists
if not os.path.isdir(backup_path):
return False, f"ERROR: Source path {backup_path} does not exist!"
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# Ensure that domain path (on this node) exists
vm_backup_path = f"{backup_path}/{domain}"
if not os.path.isdir(vm_backup_path):
return False, f"ERROR: Source VM path {vm_backup_path} does not exist!"
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# Ensure that the archives are present
backup_source_pvcbackup_file = f"{vm_backup_path}/{datestring}/pvcbackup.json"
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if not os.path.isfile(backup_source_pvcbackup_file):
return False, "ERROR: The specified source backup files do not exist!"
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# 1. Read the backup file and get VM details
try:
with open(backup_source_pvcbackup_file) as fh:
backup_source_details = jload(fh)
except Exception as e:
return False, f"ERROR: Failed to read source backup details: {e}"
# Handle incrementals
incremental_parent = backup_source_details.get("incremental_parent", None)
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if incremental_parent is not None:
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backup_source_parent_pvcbackup_file = (
f"{vm_backup_path}/{incremental_parent}/pvcbackup.json"
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)
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if not os.path.isfile(backup_source_parent_pvcbackup_file):
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return (
False,
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"ERROR: The specified backup is incremental but the required incremental parent source backup files do not exist!",
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)
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try:
with open(backup_source_parent_pvcbackup_file) as fh:
backup_source_parent_details = jload(fh)
except Exception as e:
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return (
False,
f"ERROR: Failed to read source incremental parent backup details: {e}",
)
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# 2. Import VM config and metadata in provision state
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try:
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retcode, retmsg = define_vm(
zkhandler,
backup_source_details["vm_detail"]["xml"],
backup_source_details["vm_detail"]["node"],
backup_source_details["vm_detail"]["node_limit"],
backup_source_details["vm_detail"]["node_selector"],
backup_source_details["vm_detail"]["node_autostart"],
backup_source_details["vm_detail"]["migration_method"],
backup_source_details["vm_detail"]["migration_max_downtime"],
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backup_source_details["vm_detail"]["profile"],
backup_source_details["vm_detail"]["tags"],
"restore",
)
if not retcode:
return False, f"ERROR: Failed to define restored VM: {retmsg}"
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except Exception as e:
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return False, f"ERROR: Failed to parse VM backup details: {e}"
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# 4. Import volumes
is_snapshot_remove_failed = False
which_snapshot_remove_failed = list()
if incremental_parent is not None:
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for volume_file, volume_size in backup_source_details.get("backup_files"):
pool, volume, _ = volume_file.split("/")[-1].split(".")
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try:
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parent_volume_file = [
f[0]
for f in backup_source_parent_details.get("backup_files")
if f[0].split("/")[-1].replace(".rbdimg", "")
== volume_file.split("/")[-1].replace(".rbddiff", "")
][0]
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except Exception as e:
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return (
False,
f"ERROR: Failed to find parent volume for volume {pool}/{volume}; backup may be corrupt or invalid: {e}",
)
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# First we create the expected volumes then clean them up
# This process is a bit of a hack because rbd import does not expect an existing volume,
# but we need the information in PVC.
# Thus create the RBD volume using ceph.add_volume based on the backup size, and then
# manually remove the RBD volume (leaving the PVC metainfo)
retcode, retmsg = ceph.add_volume(zkhandler, pool, volume, volume_size)
if not retcode:
return False, f"ERROR: Failed to create restored volume: {retmsg}"
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retcode, stdout, stderr = common.run_os_command(
f"rbd remove {pool}/{volume}"
)
if retcode:
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return (
False,
f"ERROR: Failed to remove temporary RBD volume '{pool}/{volume}': {stderr}",
)
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# Next we import the parent images
retcode, stdout, stderr = common.run_os_command(
f"rbd import --export-format 2 --dest-pool {pool} {backup_path}/{domain}/{incremental_parent}/{parent_volume_file} {volume}"
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)
if retcode:
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return (
False,
f"ERROR: Failed to import parent backup image {parent_volume_file}: {stderr}",
)
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# Then we import the incremental diffs
retcode, stdout, stderr = common.run_os_command(
f"rbd import-diff {backup_path}/{domain}/{datestring}/{volume_file} {pool}/{volume}"
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)
if retcode:
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return (
False,
f"ERROR: Failed to import incremental backup image {volume_file}: {stderr}",
)
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# Finally we remove the parent and child snapshots (no longer required required)
if retain_snapshot:
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retcode, retmsg = ceph.add_snapshot(
zkhandler,
pool,
volume,
f"backup_{incremental_parent}",
zk_only=True,
)
if not retcode:
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return (
False,
f"ERROR: Failed to add imported image snapshot for {parent_volume_file}: {retmsg}",
)
else:
retcode, stdout, stderr = common.run_os_command(
f"rbd snap rm {pool}/{volume}@backup_{incremental_parent}"
)
if retcode:
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is_snapshot_remove_failed = True
which_snapshot_remove_failed.append(f"{pool}/{volume}")
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retcode, stdout, stderr = common.run_os_command(
f"rbd snap rm {pool}/{volume}@backup_{datestring}"
)
if retcode:
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is_snapshot_remove_failed = True
which_snapshot_remove_failed.append(f"{pool}/{volume}")
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else:
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for volume_file, volume_size in backup_source_details.get("backup_files"):
pool, volume, _ = volume_file.split("/")[-1].split(".")
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# First we create the expected volumes then clean them up
# This process is a bit of a hack because rbd import does not expect an existing volume,
# but we need the information in PVC.
# Thus create the RBD volume using ceph.add_volume based on the backup size, and then
# manually remove the RBD volume (leaving the PVC metainfo)
retcode, retmsg = ceph.add_volume(zkhandler, pool, volume, volume_size)
if not retcode:
return False, f"ERROR: Failed to create restored volume: {retmsg}"
retcode, stdout, stderr = common.run_os_command(
f"rbd remove {pool}/{volume}"
)
if retcode:
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return (
False,
f"ERROR: Failed to remove temporary RBD volume '{pool}/{volume}': {stderr}",
)
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# Then we perform the actual import
retcode, stdout, stderr = common.run_os_command(
f"rbd import --export-format 2 --dest-pool {pool} {backup_path}/{domain}/{datestring}/{volume_file} {volume}"
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)
if retcode:
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return (
False,
f"ERROR: Failed to import backup image {volume_file}: {stderr}",
)
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# Finally we remove the source snapshot (not required)
if retain_snapshot:
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retcode, retmsg = ceph.add_snapshot(
zkhandler,
pool,
volume,
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f"backup_{datestring}",
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zk_only=True,
)
if not retcode:
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return (
False,
f"ERROR: Failed to add imported image snapshot for {volume_file}: {retmsg}",
)
else:
retcode, stdout, stderr = common.run_os_command(
f"rbd snap rm {pool}/{volume}@backup_{datestring}"
)
if retcode:
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return (
False,
f"ERROR: Failed to remove imported image snapshot for {volume_file}: {stderr}",
)
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# 5. Start VM
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retcode, retmsg = start_vm(zkhandler, domain)
if not retcode:
return False, f"ERROR: Failed to start restored VM {domain}: {retmsg}"
tend = time.time()
ttot = round(tend - tstart, 2)
retlines = list()
if is_snapshot_remove_failed:
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retlines.append(
f"WARNING: Failed to remove hanging snapshot(s) as requested for volume(s) {', '.join(which_snapshot_remove_failed)}"
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)
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myhostname = gethostname().split(".")[0]
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retlines.append(
f"Successfully restored VM backup {datestring} for '{domain}' from '{myhostname}:{backup_path}' in {ttot}s."
)
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return True, "\n".join(retlines)
#
# Celery worker tasks (must be run on node, outputs log messages to worker)
#
def vm_worker_helper_getdom(tuuid):
lv_conn = None
libvirt_uri = "qemu:///system"
# Convert (text) UUID into bytes
buuid = UUID(tuuid).bytes
try:
lv_conn = lvopen(libvirt_uri)
if lv_conn is None:
raise Exception("Failed to open local libvirt connection")
# Lookup the UUID
dom = lv_conn.lookupByUUID(buuid)
except Exception as e:
print(f"Error: {e}")
dom = None
finally:
if lv_conn is not None:
lv_conn.close()
return dom
def vm_worker_flush_locks(zkhandler, celery, domain, force_unlock=False):
current_stage = 0
total_stages = 3
start(
celery,
f"Flushing RBD locks for VM {domain} [forced={force_unlock}]",
current=current_stage,
total=total_stages,
)
dom_uuid = getDomainUUID(zkhandler, domain)
# Check that the domain is stopped (unless force_unlock is set)
domain_state = zkhandler.read(("domain.state", dom_uuid))
if not force_unlock and domain_state not in ["stop", "disable", "fail"]:
fail(
celery,
f"VM state {domain_state} not in [stop, disable, fail] and not forcing",
)
return
# Get the list of RBD images
rbd_list = zkhandler.read(("domain.storage.volumes", dom_uuid)).split(",")
current_stage += 1
update(
celery,
f"Obtaining RBD locks for VM {domain}",
current=current_stage,
total=total_stages,
)
# Prepare a list of locks
rbd_locks = list()
for rbd in rbd_list:
# Check if a lock exists
(
lock_list_retcode,
lock_list_stdout,
lock_list_stderr,
) = common.run_os_command(f"rbd lock list --format json {rbd}")
if lock_list_retcode != 0:
fail(
celery,
f"Failed to obtain lock list for volume {rbd}: {lock_list_stderr}",
)
return
try:
lock_list = jloads(lock_list_stdout)
except Exception as e:
fail(
celery,
f"Failed to parse JSON lock list for volume {rbd}: {e}",
)
return
if lock_list:
for lock in lock_list:
rbd_locks.append({"rbd": rbd, "lock": lock})
current_stage += 1
update(
celery,
f"Freeing RBD locks for VM {domain}",
current=current_stage,
total=total_stages,
)
for _lock in rbd_locks:
rbd = _lock["rbd"]
lock = _lock["lock"]
(
lock_remove_retcode,
lock_remove_stdout,
lock_remove_stderr,
) = common.run_os_command(
f"rbd lock remove {rbd} \"{lock['id']}\" \"{lock['locker']}\""
)
if lock_remove_retcode != 0:
fail(
celery,
f"Failed to free RBD lock {lock['id']} on volume {rbd}: {lock_remove_stderr}",
)
return
current_stage += 1
return finish(
celery,
f"Successfully flushed RBD locks for VM {domain}",
current=4,
total=4,
)
def vm_worker_attach_device(zkhandler, celery, domain, xml_spec):
current_stage = 0
total_stages = 1
start(
celery,
f"Hot-attaching XML device to VM {domain}",
current=current_stage,
total=total_stages,
)
dom_uuid = getDomainUUID(zkhandler, domain)
state = zkhandler.read(("domain.state", dom_uuid))
if state not in ["start"]:
fail(
celery,
f"VM {domain} not in start state; hot-attach unnecessary or impossible",
)
return
dom = vm_worker_helper_getdom(dom_uuid)
if dom is None:
fail(
celery,
f"Failed to find Libvirt object for VM {domain}",
)
return
try:
dom.attachDevice(xml_spec)
except Exception as e:
fail(celery, e)
return
current_stage += 1
return finish(
celery,
f"Successfully hot-attached XML device to VM {domain}",
current=current_stage,
total=total_stages,
)
def vm_worker_detach_device(zkhandler, celery, domain, xml_spec):
current_stage = 0
total_stages = 1
start(
celery,
f"Hot-detaching XML device from VM {domain}",
current=current_stage,
total_stages=total_stages,
)
dom_uuid = getDomainUUID(zkhandler, domain)
state = zkhandler.read(("domain.state", dom_uuid))
if state not in ["start"]:
fail(
celery,
f"VM {domain} not in start state; hot-detach unnecessary or impossible",
)
return
dom = vm_worker_helper_getdom(dom_uuid)
if dom is None:
fail(
celery,
f"Failed to find Libvirt object for VM {domain}",
)
return
try:
dom.detachDevice(xml_spec)
except Exception as e:
fail(celery, e)
return
current_stage += 1
return finish(
celery,
f"Successfully hot-detached XML device from VM {domain}",
current=current_stage,
total_stages=total_stages,
)