Move Ceph health to global cluster health
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#!/usr/bin/env python3
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# ceph.py - PVC Monitoring example plugin for Ceph status
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2022 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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# This script provides an example of a PVC monitoring plugin script. It will create
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# a simple plugin to check the Ceph cluster health for anomalies, and return a health
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# delta reflective of the overall Ceph status (HEALTH_WARN = 10, HEALTH_ERR = 50).
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# This script can thus be used as an example or reference implementation of a
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# PVC monitoring pluginscript and expanded upon as required.
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# A monitoring plugin script must implement the class "MonitoringPluginScript" which
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# extends "MonitoringPlugin", providing the 3 functions indicated. Detailed explanation
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# of the role of each function is provided in context of the example; see the other
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# examples for more potential uses.
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# WARNING:
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#
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# This script will run in the context of the node daemon keepalives as root.
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# DO NOT install untrusted, unvetted plugins under any circumstances.
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# This import is always required here, as MonitoringPlugin is used by the
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# MonitoringPluginScript class
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from pvcnoded.objects.MonitoringInstance import MonitoringPlugin
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# A monitoring plugin script must always expose its nice name, which must be identical to
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# the file name
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PLUGIN_NAME = "ceph"
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# The MonitoringPluginScript class must be named as such, and extend MonitoringPlugin.
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class MonitoringPluginScript(MonitoringPlugin):
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def setup(self):
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"""
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setup(): Perform special setup steps during node daemon startup
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This step is optional and should be used sparingly.
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If you wish for the plugin to not load in certain conditions, do any checks here
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and return a non-None failure message to indicate the error.
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"""
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pass
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def run(self):
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"""
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run(): Perform the check actions and return a PluginResult object
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"""
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# Run any imports first
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from rados import Rados
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from json import loads, dumps
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# Connect to the Ceph cluster
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try:
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ceph_conn = Rados(
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conffile=self.config["ceph_config_file"],
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conf=dict(keyring=self.config["ceph_admin_keyring"]),
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)
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ceph_conn.connect(timeout=1)
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except Exception as e:
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self.log(f"Failed to connect to Ceph cluster: {e}", state="e")
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return self.plugin_result
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# Get the Ceph cluster health
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try:
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health_status = loads(
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ceph_conn.mon_command(dumps({"prefix": "health", "format": "json"}), b"", timeout=1)[1]
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)
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ceph_health = health_status["status"]
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except Exception as e:
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self.log(f"Failed to get health data from Ceph cluster: {e}", state="e")
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return self.plugin_result
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finally:
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ceph_conn.shutdown()
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# Get a list of error entries in the health status output
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error_entries = health_status["checks"].keys()
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# Set the health delta based on the errors presented
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if ceph_health == "HEALTH_ERR":
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health_delta = 50
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message = f"Ceph cluster in ERROR state: {', '.join(error_entries)}"
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elif ceph_health == "HEALTH_WARN":
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health_delta = 10
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message = f"Ceph cluster in WARNING state: {', '.join(error_entries)}"
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else:
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health_delta = 0
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message = "Ceph cluster in OK state"
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# Set the health delta in our local PluginResult object
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self.plugin_result.set_health_delta(health_delta)
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# Set the message in our local PluginResult object
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self.plugin_result.set_message(message)
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# Set the detailed data in our local PluginResult object
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self.plugin_result.set_data(health_status)
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# Return our local PluginResult object
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return self.plugin_result
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def cleanup(self):
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"""
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cleanup(): Perform special cleanup steps during node daemon termination
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This step is optional and should be used sparingly.
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"""
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pass
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