pvc/node-daemon/pvcnoded/objects/CephInstance.py

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#!/usr/bin/env python3
# CephInstance.py - Class implementing a PVC node Ceph instance
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2021 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 json
import psutil
import daemon_lib.common as common
from distutils.util import strtobool
from re import search
class CephOSDInstance(object):
def __init__(self, zkhandler, this_node, osd_id):
self.zkhandler = zkhandler
self.this_node = this_node
self.osd_id = osd_id
self.node = None
self.size = None
self.stats = dict()
@self.zkhandler.zk_conn.DataWatch(
self.zkhandler.schema.path("osd.node", self.osd_id)
)
def watch_osd_node(data, stat, event=""):
if event and event.type == "DELETED":
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode("ascii")
except AttributeError:
data = ""
if data and data != self.node:
self.node = data
@self.zkhandler.zk_conn.DataWatch(
self.zkhandler.schema.path("osd.stats", self.osd_id)
)
def watch_osd_stats(data, stat, event=""):
if event and event.type == "DELETED":
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode("ascii")
except AttributeError:
data = ""
if data and data != self.stats:
self.stats = json.loads(data)
@staticmethod
def add_osd(
zkhandler, logger, node, device, weight, ext_db_flag=False, ext_db_ratio=0.05
):
# We are ready to create a new OSD on this node
logger.out("Creating new OSD disk on block device {}".format(device), state="i")
try:
# 1. Create an OSD; we do this so we know what ID will be gen'd
retcode, stdout, stderr = common.run_os_command("ceph osd create")
if retcode:
print("ceph osd create")
print(stdout)
print(stderr)
raise Exception
osd_id = stdout.rstrip()
# 2. Remove that newly-created OSD
retcode, stdout, stderr = common.run_os_command(
"ceph osd rm {}".format(osd_id)
)
if retcode:
print("ceph osd rm")
print(stdout)
print(stderr)
raise Exception
# 3a. Zap the disk to ensure it is ready to go
logger.out("Zapping disk {}".format(device), state="i")
retcode, stdout, stderr = common.run_os_command(
"ceph-volume lvm zap --destroy {}".format(device)
)
if retcode:
print("ceph-volume lvm zap")
print(stdout)
print(stderr)
raise Exception
dev_flags = "--data {}".format(device)
# 3b. Prepare the logical volume if ext_db_flag
if ext_db_flag:
_, osd_size_bytes, _ = common.run_os_command(
"blockdev --getsize64 {}".format(device)
)
osd_size_bytes = int(osd_size_bytes)
result = CephOSDInstance.create_osd_db_lv(
zkhandler, logger, osd_id, ext_db_ratio, osd_size_bytes
)
if not result:
raise Exception
db_device = "osd-db/osd-{}".format(osd_id)
dev_flags += " --block.db {}".format(db_device)
else:
db_device = ""
# 3c. Create the OSD for real
logger.out(
"Preparing LVM for new OSD disk with ID {} on {}".format(
osd_id, device
),
state="i",
)
retcode, stdout, stderr = common.run_os_command(
"ceph-volume lvm prepare --bluestore {devices}".format(
devices=dev_flags
)
)
if retcode:
print("ceph-volume lvm prepare")
print(stdout)
print(stderr)
raise Exception
# 4a. Get OSD FSID
logger.out(
"Getting OSD FSID for ID {} on {}".format(osd_id, device), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"ceph-volume lvm list {device}".format(device=device)
)
for line in stdout.split("\n"):
if "osd fsid" in line:
osd_fsid = line.split()[-1]
if not osd_fsid:
print("ceph-volume lvm list")
print("Could not find OSD fsid in data:")
print(stdout)
print(stderr)
raise Exception
# 4b. Activate the OSD
logger.out(
"Activating new OSD disk with ID {}".format(osd_id), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"ceph-volume lvm activate --bluestore {osdid} {osdfsid}".format(
osdid=osd_id, osdfsid=osd_fsid
)
)
if retcode:
print("ceph-volume lvm activate")
print(stdout)
print(stderr)
raise Exception
# 5. Add it to the crush map
logger.out(
"Adding new OSD disk with ID {} to CRUSH map".format(osd_id), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"ceph osd crush add osd.{osdid} {weight} root=default host={node}".format(
osdid=osd_id, weight=weight, node=node
)
)
if retcode:
print("ceph osd crush add")
print(stdout)
print(stderr)
raise Exception
time.sleep(0.5)
# 6. Verify it started
retcode, stdout, stderr = common.run_os_command(
"systemctl status ceph-osd@{osdid}".format(osdid=osd_id)
)
if retcode:
print("systemctl status")
print(stdout)
print(stderr)
raise Exception
# 7. Add the new OSD to the list
logger.out(
"Adding new OSD disk with ID {} to Zookeeper".format(osd_id), state="i"
)
zkhandler.write(
[
(("osd", osd_id), ""),
(("osd.node", osd_id), node),
(("osd.device", osd_id), device),
(("osd.db_device", osd_id), db_device),
(("osd.stats", osd_id), "{}"),
]
)
# Log it
logger.out("Created new OSD disk with ID {}".format(osd_id), state="o")
return True
except Exception as e:
# Log it
logger.out("Failed to create new OSD disk: {}".format(e), state="e")
return False
@staticmethod
def remove_osd(zkhandler, logger, osd_id, osd_obj):
logger.out("Removing OSD disk {}".format(osd_id), state="i")
try:
# 1. Verify the OSD is present
retcode, stdout, stderr = common.run_os_command("ceph osd ls")
osd_list = stdout.split("\n")
if osd_id not in osd_list:
logger.out(
"Could not find OSD {} in the cluster".format(osd_id), state="e"
)
return True
# 1. Set the OSD out so it will flush
logger.out("Setting out OSD disk with ID {}".format(osd_id), state="i")
retcode, stdout, stderr = common.run_os_command(
"ceph osd out {}".format(osd_id)
)
if retcode:
print("ceph osd out")
print(stdout)
print(stderr)
raise Exception
# 2. Wait for the OSD to flush
logger.out("Flushing OSD disk with ID {}".format(osd_id), state="i")
osd_string = str()
while True:
try:
retcode, stdout, stderr = common.run_os_command(
"ceph pg dump osds --format json"
)
dump_string = json.loads(stdout)
for osd in dump_string:
if str(osd["osd"]) == osd_id:
osd_string = osd
num_pgs = osd_string["num_pgs"]
if num_pgs > 0:
time.sleep(5)
else:
raise Exception
except Exception:
break
# 3. Stop the OSD process and wait for it to be terminated
logger.out("Stopping OSD disk with ID {}".format(osd_id), state="i")
retcode, stdout, stderr = common.run_os_command(
"systemctl stop ceph-osd@{}".format(osd_id)
)
if retcode:
print("systemctl stop")
print(stdout)
print(stderr)
raise Exception
# FIXME: There has to be a better way to do this /shrug
while True:
is_osd_up = False
# Find if there is a process named ceph-osd with arg '--id {id}'
for p in psutil.process_iter(attrs=["name", "cmdline"]):
if "ceph-osd" == p.info["name"] and "--id {}".format(
osd_id
) in " ".join(p.info["cmdline"]):
is_osd_up = True
# If there isn't, continue
if not is_osd_up:
break
# 4. Determine the block devices
retcode, stdout, stderr = common.run_os_command(
"readlink /var/lib/ceph/osd/ceph-{}/block".format(osd_id)
)
vg_name = stdout.split("/")[-2] # e.g. /dev/ceph-<uuid>/osd-block-<uuid>
retcode, stdout, stderr = common.run_os_command(
"vgs --separator , --noheadings -o pv_name {}".format(vg_name)
)
pv_block = stdout.strip()
# 5. Zap the volumes
logger.out(
"Zapping OSD disk with ID {} on {}".format(osd_id, pv_block), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"ceph-volume lvm zap --destroy {}".format(pv_block)
)
if retcode:
print("ceph-volume lvm zap")
print(stdout)
print(stderr)
raise Exception
# 6. Purge the OSD from Ceph
logger.out("Purging OSD disk with ID {}".format(osd_id), state="i")
retcode, stdout, stderr = common.run_os_command(
"ceph osd purge {} --yes-i-really-mean-it".format(osd_id)
)
if retcode:
print("ceph osd purge")
print(stdout)
print(stderr)
raise Exception
# 7. Remove the DB device
if zkhandler.exists(("osd.db_device", osd_id)):
db_device = zkhandler.read(("osd.db_device", osd_id))
logger.out(
'Removing OSD DB logical volume "{}"'.format(db_device), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"lvremove --yes --force {}".format(db_device)
)
# 8. Delete OSD from ZK
logger.out(
"Deleting OSD disk with ID {} from Zookeeper".format(osd_id), state="i"
)
zkhandler.delete(("osd", osd_id), recursive=True)
# Log it
logger.out("Removed OSD disk with ID {}".format(osd_id), state="o")
return True
except Exception as e:
# Log it
logger.out(
"Failed to purge OSD disk with ID {}: {}".format(osd_id, e), state="e"
)
return False
@staticmethod
def add_db_vg(zkhandler, logger, device):
logger.out(
"Creating new OSD database volume group on block device {}".format(device),
state="i",
)
try:
# 0. Check if an existsing volume group exists
retcode, stdout, stderr = common.run_os_command("vgdisplay osd-db")
if retcode != 5:
logger.out('Ceph OSD database VG "osd-db" already exists', state="e")
return False
# 1. Create an empty partition table
logger.out(
"Creating partitions on block device {}".format(device), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"sgdisk --clear {}".format(device)
)
if retcode:
print("sgdisk create partition table")
print(stdout)
print(stderr)
raise Exception
retcode, stdout, stderr = common.run_os_command(
"sgdisk --new 1:: --typecode 1:8e00 {}".format(device)
)
if retcode:
print("sgdisk create pv partition")
print(stdout)
print(stderr)
raise Exception
# Handle the partition ID portion
if search(r"by-path", device) or search(r"by-id", device):
# /dev/disk/by-path/pci-0000:03:00.0-scsi-0:1:0:0 -> pci-0000:03:00.0-scsi-0:1:0:0-part1
partition = "{}-part1".format(device)
elif search(r"nvme", device):
# /dev/nvme0n1 -> nvme0n1p1
partition = "{}p1".format(device)
else:
# /dev/sda -> sda1
# No other '/dev/disk/by-*' types are valid for raw block devices anyways
partition = "{}1".format(device)
# 2. Create the PV
logger.out("Creating PV on block device {}".format(partition), state="i")
retcode, stdout, stderr = common.run_os_command(
"pvcreate --force {}".format(partition)
)
if retcode:
print("pv creation")
print(stdout)
print(stderr)
raise Exception
# 2. Create the VG (named 'osd-db')
logger.out(
'Creating VG "osd-db" on block device {}'.format(partition), state="i"
)
retcode, stdout, stderr = common.run_os_command(
"vgcreate --force osd-db {}".format(partition)
)
if retcode:
print("vg creation")
print(stdout)
print(stderr)
raise Exception
# Log it
logger.out(
"Created new OSD database volume group on block device {}".format(
device
),
state="o",
)
return True
except Exception as e:
# Log it
logger.out(
"Failed to create OSD database volume group: {}".format(e), state="e"
)
return False
@staticmethod
def create_osd_db_lv(zkhandler, logger, osd_id, ext_db_ratio, osd_size_bytes):
logger.out(
"Creating new OSD database logical volume for OSD ID {}".format(osd_id),
state="i",
)
try:
# 0. Check if an existsing logical volume exists
retcode, stdout, stderr = common.run_os_command(
"lvdisplay osd-db/osd{}".format(osd_id)
)
if retcode != 5:
logger.out(
'Ceph OSD database LV "osd-db/osd{}" already exists'.format(osd_id),
state="e",
)
return False
# 1. Determine LV sizing
osd_db_size = int(osd_size_bytes * ext_db_ratio / 1024 / 1024)
# 2. Create the LV
logger.out(
'Creating DB LV "osd-db/osd-{}" of {}M ({} * {})'.format(
osd_id, osd_db_size, osd_size_bytes, ext_db_ratio
),
state="i",
)
retcode, stdout, stderr = common.run_os_command(
"lvcreate --yes --name osd-{} --size {} osd-db".format(
osd_id, osd_db_size
)
)
if retcode:
print("db lv creation")
print(stdout)
print(stderr)
raise Exception
# Log it
logger.out(
'Created new OSD database logical volume "osd-db/osd-{}"'.format(
osd_id
),
state="o",
)
return True
except Exception as e:
# Log it
logger.out(
"Failed to create OSD database logical volume: {}".format(e), state="e"
)
return False
class CephPoolInstance(object):
def __init__(self, zkhandler, this_node, name):
self.zkhandler = zkhandler
self.this_node = this_node
self.name = name
self.pgs = ""
self.stats = dict()
@self.zkhandler.zk_conn.DataWatch(
self.zkhandler.schema.path("pool.pgs", self.name)
)
def watch_pool_node(data, stat, event=""):
if event and event.type == "DELETED":
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode("ascii")
except AttributeError:
data = ""
if data and data != self.pgs:
self.pgs = data
@self.zkhandler.zk_conn.DataWatch(
self.zkhandler.schema.path("pool.stats", self.name)
)
def watch_pool_stats(data, stat, event=""):
if event and event.type == "DELETED":
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode("ascii")
except AttributeError:
data = ""
if data and data != self.stats:
self.stats = json.loads(data)
class CephVolumeInstance(object):
def __init__(self, zkhandler, this_node, pool, name):
self.zkhandler = zkhandler
self.this_node = this_node
self.pool = pool
self.name = name
self.stats = dict()
@self.zkhandler.zk_conn.DataWatch(
self.zkhandler.schema.path("volume.stats", f"{self.pool}/{self.name}")
)
def watch_volume_stats(data, stat, event=""):
if event and event.type == "DELETED":
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode("ascii")
except AttributeError:
data = ""
if data and data != self.stats:
self.stats = json.loads(data)
class CephSnapshotInstance(object):
def __init__(self, zkhandler, this_node, pool, volume, name):
self.zkhandler = zkhandler
self.this_node = this_node
self.pool = pool
self.volume = volume
self.name = name
self.stats = dict()
@self.zkhandler.zk_conn.DataWatch(
self.zkhandler.schema.path(
"snapshot.stats", f"{self.pool}/{self.volume}/{self.name}"
)
)
def watch_snapshot_stats(data, stat, event=""):
if event and event.type == "DELETED":
# The key has been deleted after existing before; terminate this watcher
# because this class instance is about to be reaped in Daemon.py
return False
try:
data = data.decode("ascii")
except AttributeError:
data = ""
if data and data != self.stats:
self.stats = json.loads(data)
# Primary command function
# This command pipe is only used for OSD adds and removes
def ceph_command(zkhandler, logger, this_node, data, d_osd):
# Get the command and args
command, args = data.split()
# Adding a new OSD
if command == "osd_add":
node, device, weight, ext_db_flag, ext_db_ratio = args.split(",")
ext_db_flag = bool(strtobool(ext_db_flag))
ext_db_ratio = float(ext_db_ratio)
if node == this_node.name:
# Lock the command queue
zk_lock = zkhandler.writelock("base.cmd.ceph")
with zk_lock:
# Add the OSD
result = CephOSDInstance.add_osd(
zkhandler, logger, node, device, weight, ext_db_flag, ext_db_ratio
)
# Command succeeded
if result:
# Update the command queue
zkhandler.write([("base.cmd.ceph", "success-{}".format(data))])
# Command failed
else:
# Update the command queue
zkhandler.write([("base.cmd.ceph", "failure-{}".format(data))])
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
time.sleep(1)
# Removing an OSD
elif command == "osd_remove":
osd_id = args
# Verify osd_id is in the list
if d_osd[osd_id] and d_osd[osd_id].node == this_node.name:
# Lock the command queue
zk_lock = zkhandler.writelock("base.cmd.ceph")
with zk_lock:
# Remove the OSD
result = CephOSDInstance.remove_osd(
zkhandler, logger, osd_id, d_osd[osd_id]
)
# Command succeeded
if result:
# Update the command queue
zkhandler.write([("base.cmd.ceph", "success-{}".format(data))])
# Command failed
else:
# Update the command queue
zkhandler.write([("base.cmd.ceph", "failure-{}".format(data))])
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
time.sleep(1)
# Adding a new DB VG
elif command == "db_vg_add":
node, device = args.split(",")
if node == this_node.name:
# Lock the command queue
zk_lock = zkhandler.writelock("base.cmd.ceph")
with zk_lock:
# Add the VG
result = CephOSDInstance.add_db_vg(zkhandler, logger, device)
# Command succeeded
if result:
# Update the command queue
zkhandler.write([("base.cmd.ceph", "success-{}".format(data))])
# Command failed
else:
# Update the command queue
zkhandler.write([("base.cmd.ceph", "failure={}".format(data))])
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
time.sleep(1)