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Chapter 4. Configuring external Alertmanager instances
The OpenShift Dedicated monitoring stack includes a local Alertmanager instance that routes alerts from Prometheus.
You can add external Alertmanager instances to route alerts for user-defined projects.
If you add the same external Alertmanager configuration for multiple clusters and disable the local instance for each cluster, you can then manage alert routing for multiple clusters by using a single external Alertmanager instance.
Prerequisites
-
You have access to the cluster as a user with the
dedicated-adminrole. -
The
user-workload-monitoring-configConfigMapobject exists. This object is created by default when the cluster is created. -
You have installed the OpenShift CLI (
oc).
Procedure
Edit the
user-workload-monitoring-configconfig map in theopenshift-user-workload-monitoringproject:$ oc -n openshift-user-workload-monitoring edit configmap user-workload-monitoring-config
Add an
additionalAlertmanagerConfigssection with configuration details underdata/config.yaml/<component>:apiVersion: v1 kind: ConfigMap metadata: name: user-workload-monitoring-config namespace: openshift-user-workload-monitoring data: config.yaml: | <component>: 1 additionalAlertmanagerConfigs: - <alertmanager_specification> 2- 2
- Substitute
<alertmanager_specification>with authentication and other configuration details for additional Alertmanager instances. Currently supported authentication methods are bearer token (bearerToken) and client TLS (tlsConfig). - 1
- Substitute
<component>for one of two supported external Alertmanager components:prometheusorthanosRuler.
The following sample config map configures an additional Alertmanager for Thanos Ruler by using a bearer token with client TLS authentication:
apiVersion: v1 kind: ConfigMap metadata: name: user-workload-monitoring-config namespace: openshift-user-workload-monitoring data: config.yaml: | thanosRuler: additionalAlertmanagerConfigs: - scheme: https pathPrefix: / timeout: "30s" apiVersion: v1 bearerToken: name: alertmanager-bearer-token key: token tlsConfig: key: name: alertmanager-tls key: tls.key cert: name: alertmanager-tls key: tls.crt ca: name: alertmanager-tls key: tls.ca staticConfigs: - external-alertmanager1-remote.com - external-alertmanager1-remote2.com- Save the file to apply the changes. The pods affected by the new configuration are automatically redeployed.
