385 lines
13 KiB
Python
385 lines
13 KiB
Python
#!/usr/bin/env python3
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# cluster.py - PVC client function library, cluster management
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2021 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import re
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import daemon_lib.common as common
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import daemon_lib.vm as pvc_vm
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import daemon_lib.node as pvc_node
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import daemon_lib.network as pvc_network
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import daemon_lib.ceph as pvc_ceph
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def set_maintenance(zkhandler, maint_state):
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current_maint_state = zkhandler.read("base.config.maintenance")
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if maint_state == current_maint_state:
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if maint_state == "true":
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return True, "Cluster is already in maintenance mode"
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else:
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return True, "Cluster is already in normal mode"
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if maint_state == "true":
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zkhandler.write([("base.config.maintenance", "true")])
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return True, "Successfully set cluster in maintenance mode"
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else:
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zkhandler.write([("base.config.maintenance", "false")])
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return True, "Successfully set cluster in normal mode"
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def getClusterInformation(zkhandler):
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# Get cluster maintenance state
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maint_state = zkhandler.read("base.config.maintenance")
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# List of messages to display to the clients
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cluster_health_msg = []
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storage_health_msg = []
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# Get node information object list
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retcode, node_list = pvc_node.get_list(zkhandler, None)
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# Get vm information object list
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retcode, vm_list = pvc_vm.get_list(zkhandler, None, None, None, None)
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# Get network information object list
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retcode, network_list = pvc_network.get_list(zkhandler, None, None)
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# Get storage information object list
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retcode, ceph_osd_list = pvc_ceph.get_list_osd(zkhandler, None)
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retcode, ceph_pool_list = pvc_ceph.get_list_pool(zkhandler, None)
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retcode, ceph_volume_list = pvc_ceph.get_list_volume(zkhandler, None, None)
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retcode, ceph_snapshot_list = pvc_ceph.get_list_snapshot(
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zkhandler, None, None, None
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)
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# Determine, for each subsection, the total count
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node_count = len(node_list)
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vm_count = len(vm_list)
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network_count = len(network_list)
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ceph_osd_count = len(ceph_osd_list)
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ceph_pool_count = len(ceph_pool_list)
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ceph_volume_count = len(ceph_volume_list)
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ceph_snapshot_count = len(ceph_snapshot_list)
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# Determinations for general cluster health
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cluster_healthy_status = True
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# Check for (n-1) overprovisioning
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# Assume X nodes. If the total VM memory allocation (counting only running VMss) is greater than
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# the total memory of the (n-1) smallest nodes, trigger this warning.
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n_minus_1_total = 0
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alloc_total = 0
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node_largest_index = None
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node_largest_count = 0
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for index, node in enumerate(node_list):
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node_mem_total = node["memory"]["total"]
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node_mem_alloc = node["memory"]["allocated"]
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alloc_total += node_mem_alloc
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# Determine if this node is the largest seen so far
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if node_mem_total > node_largest_count:
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node_largest_index = index
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node_largest_count = node_mem_total
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n_minus_1_node_list = list()
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for index, node in enumerate(node_list):
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if index == node_largest_index:
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continue
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n_minus_1_node_list.append(node)
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for index, node in enumerate(n_minus_1_node_list):
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n_minus_1_total += node["memory"]["total"]
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if alloc_total > n_minus_1_total:
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cluster_healthy_status = False
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cluster_health_msg.append(
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"Total VM memory ({}) is overprovisioned (max {}) for (n-1) failure scenarios".format(
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alloc_total, n_minus_1_total
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)
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)
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# Determinations for node health
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node_healthy_status = list(range(0, node_count))
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node_report_status = list(range(0, node_count))
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for index, node in enumerate(node_list):
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daemon_state = node["daemon_state"]
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domain_state = node["domain_state"]
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if daemon_state != "run" and domain_state != "ready":
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node_healthy_status[index] = False
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cluster_health_msg.append(
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"Node '{}' in {},{} state".format(
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node["name"], daemon_state, domain_state
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)
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)
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else:
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node_healthy_status[index] = True
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node_report_status[index] = daemon_state + "," + domain_state
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# Determinations for VM health
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vm_healthy_status = list(range(0, vm_count))
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vm_report_status = list(range(0, vm_count))
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for index, vm in enumerate(vm_list):
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vm_state = vm["state"]
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if vm_state not in ["start", "disable", "migrate", "unmigrate", "provision"]:
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vm_healthy_status[index] = False
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cluster_health_msg.append(
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"VM '{}' in {} state".format(vm["name"], vm_state)
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)
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else:
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vm_healthy_status[index] = True
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vm_report_status[index] = vm_state
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# Determinations for OSD health
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ceph_osd_healthy_status = list(range(0, ceph_osd_count))
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ceph_osd_report_status = list(range(0, ceph_osd_count))
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for index, ceph_osd in enumerate(ceph_osd_list):
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try:
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ceph_osd_up = ceph_osd["stats"]["up"]
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except KeyError:
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ceph_osd_up = 0
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try:
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ceph_osd_in = ceph_osd["stats"]["in"]
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except KeyError:
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ceph_osd_in = 0
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up_texts = {1: "up", 0: "down"}
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in_texts = {1: "in", 0: "out"}
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if not ceph_osd_up or not ceph_osd_in:
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ceph_osd_healthy_status[index] = False
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cluster_health_msg.append(
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"OSD {} in {},{} state".format(
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ceph_osd["id"], up_texts[ceph_osd_up], in_texts[ceph_osd_in]
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)
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)
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else:
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ceph_osd_healthy_status[index] = True
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ceph_osd_report_status[index] = (
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up_texts[ceph_osd_up] + "," + in_texts[ceph_osd_in]
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)
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# Find out the overall cluster health; if any element of a healthy_status is false, it's unhealthy
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if maint_state == "true":
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cluster_health = "Maintenance"
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elif (
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cluster_healthy_status is False
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or False in node_healthy_status
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or False in vm_healthy_status
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or False in ceph_osd_healthy_status
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):
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cluster_health = "Degraded"
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else:
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cluster_health = "Optimal"
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# Find out our storage health from Ceph
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ceph_status = zkhandler.read("base.storage").split("\n")
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ceph_health = ceph_status[2].split()[-1]
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# Parse the status output to get the health indicators
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line_record = False
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for index, line in enumerate(ceph_status):
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if re.search("services:", line):
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line_record = False
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if line_record and len(line.strip()) > 0:
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storage_health_msg.append(line.strip())
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if re.search("health:", line):
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line_record = True
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if maint_state == "true":
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storage_health = "Maintenance"
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elif ceph_health != "HEALTH_OK":
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storage_health = "Degraded"
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else:
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storage_health = "Optimal"
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# State lists
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node_state_combinations = [
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"run,ready",
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"run,flush",
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"run,flushed",
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"run,unflush",
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"init,ready",
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"init,flush",
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"init,flushed",
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"init,unflush",
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"stop,ready",
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"stop,flush",
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"stop,flushed",
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"stop,unflush",
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"dead,ready",
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"dead,flush",
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"dead,flushed",
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"dead,unflush",
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]
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vm_state_combinations = [
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"start",
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"restart",
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"shutdown",
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"stop",
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"disable",
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"fail",
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"migrate",
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"unmigrate",
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"provision",
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]
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ceph_osd_state_combinations = ["up,in", "up,out", "down,in", "down,out"]
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# Format the Node states
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formatted_node_states = {"total": node_count}
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for state in node_state_combinations:
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state_count = 0
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for node_state in node_report_status:
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if node_state == state:
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state_count += 1
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if state_count > 0:
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formatted_node_states[state] = state_count
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# Format the VM states
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formatted_vm_states = {"total": vm_count}
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for state in vm_state_combinations:
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state_count = 0
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for vm_state in vm_report_status:
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if vm_state == state:
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state_count += 1
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if state_count > 0:
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formatted_vm_states[state] = state_count
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# Format the OSD states
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formatted_osd_states = {"total": ceph_osd_count}
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for state in ceph_osd_state_combinations:
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state_count = 0
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for ceph_osd_state in ceph_osd_report_status:
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if ceph_osd_state == state:
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state_count += 1
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if state_count > 0:
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formatted_osd_states[state] = state_count
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# Format the status data
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cluster_information = {
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"health": cluster_health,
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"health_msg": cluster_health_msg,
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"storage_health": storage_health,
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"storage_health_msg": storage_health_msg,
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"primary_node": common.getPrimaryNode(zkhandler),
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"upstream_ip": zkhandler.read("base.config.upstream_ip"),
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"nodes": formatted_node_states,
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"vms": formatted_vm_states,
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"networks": network_count,
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"osds": formatted_osd_states,
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"pools": ceph_pool_count,
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"volumes": ceph_volume_count,
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"snapshots": ceph_snapshot_count,
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}
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return cluster_information
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def get_info(zkhandler):
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# This is a thin wrapper function for naming purposes
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cluster_information = getClusterInformation(zkhandler)
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if cluster_information:
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return True, cluster_information
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else:
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return False, "ERROR: Failed to obtain cluster information!"
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def cluster_initialize(zkhandler, overwrite=False):
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# Abort if we've initialized the cluster before
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if zkhandler.exists("base.config.primary_node") and not overwrite:
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return False, "ERROR: Cluster contains data and overwrite not set."
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if overwrite:
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# Delete the existing keys
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for key in zkhandler.schema.keys("base"):
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if key == "root":
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# Don't delete the root key
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continue
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status = zkhandler.delete("base.{}".format(key), recursive=True)
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if not status:
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return (
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False,
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"ERROR: Failed to delete data in cluster; running nodes perhaps?",
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)
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# Create the root keys
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zkhandler.schema.apply(zkhandler)
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return True, "Successfully initialized cluster"
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def cluster_backup(zkhandler):
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# Dictionary of values to come
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cluster_data = dict()
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def get_data(path):
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data = zkhandler.read(path)
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children = zkhandler.children(path)
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cluster_data[path] = data
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if children:
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if path == "/":
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child_prefix = "/"
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else:
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child_prefix = path + "/"
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for child in children:
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if child_prefix + child == "/zookeeper":
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# We must skip the built-in /zookeeper tree
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continue
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if child_prefix + child == "/patroni":
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# We must skip the /patroni tree
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continue
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get_data(child_prefix + child)
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try:
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get_data("/")
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except Exception as e:
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return False, "ERROR: Failed to obtain backup: {}".format(e)
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return True, cluster_data
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def cluster_restore(zkhandler, cluster_data):
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# Build a key+value list
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kv = []
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schema_version = None
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for key in cluster_data:
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if key == zkhandler.schema.path("base.schema.version"):
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schema_version = cluster_data[key]
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data = cluster_data[key]
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kv.append((key, data))
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if int(schema_version) != int(zkhandler.schema.version):
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return (
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False,
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"ERROR: Schema version of backup ({}) does not match cluster schema version ({}).".format(
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schema_version, zkhandler.schema.version
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),
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)
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# Close the Zookeeper connection
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result = zkhandler.write(kv)
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if result:
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return True, "Restore completed successfully."
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else:
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return False, "Restore failed."
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