pvc/node-daemon/plugins/ceph

127 lines
4.6 KiB
Python

#!/usr/bin/env python3
# ceph.py - PVC Monitoring example plugin for Ceph status
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018-2022 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/>.
#
###############################################################################
# This script provides an example of a PVC monitoring plugin script. It will create
# a simple plugin to check the Ceph cluster health for anomalies, and return a health
# delta reflective of the overall Ceph status (HEALTH_WARN = 10, HEALTH_ERR = 50).
# This script can thus be used as an example or reference implementation of a
# PVC monitoring pluginscript and expanded upon as required.
# A monitoring plugin script must implement the class "MonitoringPluginScript" which
# extends "MonitoringPlugin", providing the 3 functions indicated. Detailed explanation
# of the role of each function is provided in context of the example; see the other
# examples for more potential uses.
# WARNING:
#
# This script will run in the context of the node daemon keepalives as root.
# DO NOT install untrusted, unvetted plugins under any circumstances.
# This import is always required here, as MonitoringPlugin is used by the
# MonitoringPluginScript class
from pvcnoded.objects.MonitoringInstance import MonitoringPlugin
# A monitoring plugin script must always expose its nice name, which must be identical to
# the file name
PLUGIN_NAME = "ceph"
# The MonitoringPluginScript class must be named as such, and extend MonitoringPlugin.
class MonitoringPluginScript(MonitoringPlugin):
def setup(self):
"""
setup(): Perform special setup steps during node daemon startup
This step is optional and should be used sparingly.
"""
pass
def run(self):
"""
run(): Perform the check actions and return a PluginResult object
"""
# Run any imports first
from rados import Rados
from json import loads, dumps
# Connect to the Ceph cluster
try:
ceph_conn = Rados(
conffile=self.config["ceph_config_file"],
conf=dict(keyring=self.config["ceph_admin_keyring"]),
)
ceph_conn.connect(timeout=1)
except Exception as e:
self.log(f"Failed to connect to Ceph cluster: {e}", state="e")
return self.plugin_result
# Get the Ceph cluster health
try:
health_status = loads(
ceph_conn.mon_command(dumps({"prefix": "health", "format": "json"}), b"", timeout=1)[1]
)
ceph_health = health_status["status"]
except Exception as e:
self.log(f"Failed to get health data from Ceph cluster: {e}", state="e")
return self.plugin_result
finally:
ceph_conn.shutdown()
# Get a list of error entries in the health status output
error_entries = health_status["checks"].keys()
# Set the health delta based on the errors presented
if ceph_health == "HEALTH_ERR":
health_delta = 50
message = f"Ceph cluster in ERROR state: {', '.join(error_entries)}"
elif ceph_health == "HEALTH_WARN":
health_delta = 10
message = f"Ceph cluster in WARNING state: {', '.join(error_entries)}"
else:
health_delta = 0
message = "Ceph cluster in OK state"
# Set the health delta in our local PluginResult object
self.plugin_result.set_health_delta(health_delta)
# Set the message in our local PluginResult object
self.plugin_result.set_message(message)
# Set the detailed data in our local PluginResult object
self.plugin_result.set_data(health_status)
# Return our local PluginResult object
return self.plugin_result
def cleanup(self):
"""
cleanup(): Perform special cleanup steps during node daemon termination
This step is optional and should be used sparingly.
"""
pass