Cloud / Kubernetes / OpenShift
OpenShift 4: AlertManager + Slack Configuration
Objective
Sending alert to Slack and defined proper channel for each alert type.
Pre-Requisites:
- Three channels created in slack
- #watchdog
- #clusterwatch
- Incoming webhook configured for each of the channel.
Default openshift-monitoring stack only monitor platform specific object and target. For application, there is technology-preview features here.
Steps
1. Get each of the webhook URL from above pre-req.
2. Create alertmanager.yaml as below example:
"global":
"resolve_timeout": "5m"
"receivers":
- "name": "watchdog_receiver"
"slack_configs":
- "api_url": "https://hooks.slack.com/services/XXXX/XXXX/XXXX"
"channel": "#watchdog"
- "name": "cluster_receiver"
"slack_configs":
- "api_url": "https://hooks.slack.com/services/XXXX/XXXX/XXXX"
"channel": "#clusterwatch"
# set a proper receiver if you want a default receiver for all alerts
- "name": "null"
"route":
"group_by": ['alertname', 'cluster', 'service']
# Below interval as for lab purpose, please set proper value for your environment.
"group_interval": "1m"
"group_wait": "10s"
"repeat_interval": "2m"
# set a proper receiver if you want a default receiver for all alerts
"receiver": "null"
"routes":
- "match":
"alertname": "Watchdog"
"receiver": "watchdog_receiver"
- "match_re":
"namespace": "^(openshift|kube)$"
"receiver": "cluster_receiver"
# To get alertname, browse to Prometheus UI > Alerts
- "match_re":
"alertname": "^(Cluster|Cloud|Machine|Pod|Kube|MCD|Alertmanager|etcd|TargetDown|CPU|Node|Clock|Prometheus|Failing|Network|IPTable)$"
"receiver": "cluster_receiver"
- "match":
"severity": "critical"
"receiver": "cluster_receiver"
3. Replace a new secret:
# oc -n openshift-monitoring create secret generic alertmanager-main --from-file=alertmanager.yaml --dry-run -o=yaml | oc -n openshift-monitoring replace secret --filename=-
4. Optionally restart all AlertManager pod:
# oc delete po -l alertmanager=main -n openshift-monitoringResources
- https://github.com/prometheus/alertmanager/blob/master/doc/examples/simple.yml
- https://prometheus.io/docs/alerting/configuration
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