Update Munin plugin example
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@ -4,38 +4,25 @@ This directory contains several monitoring resources that can be used with vario
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## Munin
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The included Munin plugin can be activated by linking to it from `/etc/munin/plugins/pvc`. By default, this plugin triggers a CRITICAL state when either the PVC or Storage cluster becomes Degraded, and is otherwise OK. The overall health is graphed numerically (Optimal is 0, Maintenance is 1, Degraded is 2) so that the cluster health can be tracked over time.
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The included Munin plugins can be activated by linking to them from `/etc/munin/plugins/`. Two plugins are provided:
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When using this plugin, it might be useful to adjust the thresholds with a plugin configuration. For instance, one could adjust the Degraded value from CRITICAL to WARNING by adjusting the critical threshold to a value higher than 1.99 (e.g. 3, 10, etc.) so that only the WARNING threshold will be hit. Alternatively one could instead make Maintenance mode trigger a WARNING by lowering the threshold to 0.99.
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* `pvc`: Checks the PVC cluster and node health, providing two graphs, one for each.
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Example plugin configuration:
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* `ceph_utilization`: Checks the Ceph cluster statistics, providing multiple graphs. Note that this plugin is independent of PVC itself, and makes local calls to various Ceph commands itself.
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```
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[pvc]
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# Make cluster warn on maintenance
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env.pvc_cluster_warning 0.99
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# Disable critical threshold (>2)
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env.pvc_cluster_critical 3
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# Make storage warn on maintenance, crit on degraded (latter is default)
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env.pvc_storage_warning 0.99
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env.pvc_storage_critical 1.99
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```
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The `pvc` plugin provides no configuration; the status is hardcoded such that <=90% health is warning, <=50% health is critical, and maintenance state forces OK.
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The `ceph_utilization` plugin provides no configuration; only the cluster utilization graph alerts such that >80% used is warning and >90% used is critical. Ceph itself begins warning above 80% as well.
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## CheckMK
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The included CheckMK plugin is divided into two parts: the agent plugin, and the monitoring server plugin, and can be activated as follows:
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The included CheckMK plugin is divided into two parts: the agent plugin, and the monitoring server plugin. This monitoring server plugin requires CheckMK version 2.0 or higher. The two parts can be installed as follows:
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### Agent plugin: `pvc`
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* `pvc`: Place this file in the `/usr/lib/check_mk_agent/plugins/` directory on each node.
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Place this file in the `/usr/lib/check_mk_agent/plugins/` directory on each node.
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* `pvc.py`: Place this file in the `~/local/lib/python3/cmk/base/plugins/agent_based/` directory on the CheckMK monitoring host for each monitoring site.
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### Server plugin: `pvc.py`
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This monitoring server plugin requires CheckMK version 2.0 or higher.
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Place this file in the `~/local/lib/python3/cmk/base/plugins/agent_based/` directory for each monitoring site.
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### Output
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The plugin provides no configuration: the status is hardcoded such that <=90% health is warning, <=50% health is critical, and maintenance state forces OK.
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With both the agent and server plugins installed, you can then run `cmk -II <node>` (or use WATO) to inventory each node, which should produce two new checks:
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@ -7,23 +7,6 @@
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pvc - Plugin to monitor a PVC cluster.
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=head1 CONFIGURATION
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Note that due to how Munin thresholds work, these values must always be slightly less than 1 or 2 respectively,
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or the alerts will never be triggered.
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Defaults (no config required):
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[pvc]
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env.warning 1.99
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env.critical 1.99
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Make degraded cluster WARN only (max value is 2, so 3 effectively disables):
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[pvc]
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env.pvc_cluster_warning 1.99
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env.pvc_cluster_critical 3
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=head1 AUTHOR
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Joshua Boniface <joshua@boniface.me>
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@ -45,24 +28,14 @@ GPLv3
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. "$MUNIN_LIBDIR/plugins/plugin.sh"
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warning=1.99
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critical=1.99
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warning=1
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critical=2
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export PVC_CLIENT_DIR="/run/shm/munin-pvc"
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PVC_CMD="/usr/bin/pvc --quiet --cluster local status --format json-pretty"
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JQ_CMD="/usr/bin/jq"
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output_usage() {
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echo "This plugin outputs numerical values based on the health of the PVC cluster."
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echo
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echo "There are separate outputs for both the PVC cluster itself as well as the Ceph storage cluster."
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echo "In normal operation, i.e. when both clusters are in 'Optimal' state, the plugin returns 0 for"
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echo "each cluster. When the cluster is placed into 'Maintenance' mode,the plugin returns 1 for each"
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echo "cluster, and goes into WARN state (limit 0.99); this can be adjusted by overriding the WARNING"
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echo "threshold of the plugin to something other than 0.99 - note that due to Munin's alerting design,"
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echo "the warning value must always be very slightly below the whole number. When either cluster"
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echo "element becomes 'Degraded', the plugin returns 2 for the relevant cluster, which is treated as a"
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echo "critical. Like the WARNING threshold, this can be overridden, and with the same caveat about limit."
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exit 0
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}
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@ -84,72 +57,73 @@ output_autoconf() {
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}
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output_config() {
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echo 'graph_title PVC Clusters'
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echo 'graph_args --base 1000'
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echo 'graph_title PVC CHealth'
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echo 'graph_args --base 100'
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echo 'graph_vlabel Count'
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echo 'graph_category pvc'
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echo 'graph_period second'
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echo 'graph_info This graph shows the nodes in the PVC cluster.'
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echo 'graph_info These graphs show the health of the PVC cluster and specific node.'
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echo 'pvc_cluster.label Cluster Degradation'
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echo 'pvc_cluster.label Cluster Health'
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echo 'pvc_cluster.type GAUGE'
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echo 'pvc_cluster.max 2'
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echo 'pvc_cluster.info Whether the PVC cluster is in a degraded state.'
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print_warning pvc_cluster
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print_critical pvc_cluster
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echo 'pvc_cluster.max 100'
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echo 'pvc_cluster.info Health of the PVC cluster in %.'
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echo 'pvc_storage.label Storage Degradation'
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echo 'pvc_storage.type GAUGE'
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echo 'pvc_storage.max 2'
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echo 'pvc_storage.info Whether the storage cluster is in a degraded state.'
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print_warning pvc_storage
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print_critical pvc_storage
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echo 'pvc_cluster_alert.label Cluster Health State'
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echo 'pvc_cluster_alert.type GAUGE'
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echo 'pvc_cluster_alert.max 2',
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echo 'pvc_cluster_alert.info Alerting state of the PVC cluster health'
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print_warning pvc_cluster_alert
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print_critical pvc_cluster_alert
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echo 'pvc_node.label Node Health'
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echo 'pvc_node.type GAUGE'
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echo 'pvc_node.max 100'
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echo 'pvc_node.info Health of the PVC node in %.'
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echo 'pvc_node_alert.label Node Health State'
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echo 'pvc_node_alert.type GAUGE'
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echo 'pvc_node_alert.max 2',
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echo 'pvc_node_alert.info Alerting state of the PVC node health'
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print_warning pvc_node_alert
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print_critical pvc_node_alert
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exit 0
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}
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output_values() {
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PVC_OUTPUT="$( $PVC_CMD )"
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HOST="$( hostname --short )"
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cluster_health="$( $JQ_CMD '.health' <<<"${PVC_OUTPUT}" | tr -d '"' )"
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cluster_failed_reason="$( $JQ_CMD -r '.health_msg | @csv' <<<"${PVC_OUTPUT}" | tr -d '"' | sed 's/,/, /g' )"
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case $cluster_health in
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"Optimal")
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cluster_value="0"
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;;
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"Maintenance")
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cluster_value="1"
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;;
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"Degraded")
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cluster_value="2"
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esac
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in_maintenance="$( $JQ_CMD ".maintenance" <<<"${PVC_OUTPUT}" | tr -d '"' )"
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storage_health="$( $JQ_CMD '.storage_health' <<<"${PVC_OUTPUT}" | tr -d '"' )"
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storage_failed_reason="$( $JQ_CMD -r '.storage_health_msg | @csv' <<<"${PVC_OUTPUT}" | tr -d '"' | sed 's/,/, /g' )"
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case $storage_health in
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"Optimal")
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storage_value="0"
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;;
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"Maintenance")
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storage_value="1"
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;;
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"Degraded")
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storage_value="2"
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esac
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cluster_health="$( $JQ_CMD ".cluster_health.health" <<<"${PVC_OUTPUT}" | tr -d '"' )"
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cluster_health_messages="$( $JQ_CMD -r ".cluster_health.messages | @csv" <<<"${PVC_OUTPUT}" | tr -d '"' | sed 's/,/, /g' )"
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echo "pvc_cluster.value ${cluster_health}"
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echo "pvc_cluster.extinfo ${cluster_health_messages}"
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if [[ ${cluster_health} -le 50 && ${is_maintenance} == "false" ]]; then
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cluster_health_alert=2
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elif [[ ${cluster_health} -le 90 && ${is_maintenance} == "false" ]]; then
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cluster_health_alert=1
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else
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cluster_health_alert=0
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fi
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echo "pvc_cluster_alert.value ${cluster_health_alert}"
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echo "pvc_cluster.value $cluster_value"
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if [[ $cluster_value -eq 1 ]]; then
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echo "pvc_cluster.extinfo Cluster in maintenance mode"
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elif [[ $cluster_value -eq 2 ]]; then
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echo "pvc_cluster.extinfo ${cluster_failed_reason}"
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fi
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echo "pvc_storage.value $storage_value"
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if [[ $storage_value -eq 1 ]]; then
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echo "pvc_storage.extinfo Cluster in maintenance mode"
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elif [[ $storage_value -eq 2 ]]; then
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echo "pvc_storage.extinfo ${storage_failed_reason}"
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fi
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node_health="$( $JQ_CMD ".node_health.${HOST}.health" <<<"${PVC_OUTPUT}" | tr -d '"' )"
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node_health_messages="$( $JQ_CMD -r ".node_health.${HOST}.messages | @csv" <<<"${PVC_OUTPUT}" | tr -d '"' | sed 's/,/, /g' )"
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echo "pvc_node.value ${node_health}"
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echo "pvc_node.extinfo ${node_health_messages}"
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if [[ ${node_health} -le 50 && ${is_maintenance} == "false" ]]; then
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node_health_alert=2
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elif [[ ${node_health} -le 90 && ${is_maintenance} == "false" ]]; then
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node_health_alert=1
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else
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node_health_alert=0
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fi
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echo "pvc_node_alert.value ${node_health_alert}"
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}
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case $# in
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