8.2. Configuring cluster monitoring

Procedure

To increase the storage capacity for Prometheus:

Create a YAML configuration file, cluster-monitoring-config.yml. For example:

apiVersion: v1
kind: ConfigMap
data:
  config.yaml: |
    prometheusOperator:
      baseImage: quay.io/coreos/prometheus-operator
      prometheusConfigReloaderBaseImage: quay.io/coreos/prometheus-config-reloader
      configReloaderBaseImage: quay.io/coreos/configmap-reload
      nodeSelector:
        node-role.kubernetes.io/infra: ""
    prometheusK8s:
      retention: {{PROMETHEUS_RETENTION_PERIOD}}


      baseImage: openshift/prometheus
      nodeSelector:
        node-role.kubernetes.io/infra: ""
      volumeClaimTemplate:
        spec:
          storageClassName: gp2
          resources:
            requests:
              storage: {{PROMETHEUS_STORAGE_SIZE}}


    alertmanagerMain:
      baseImage: openshift/prometheus-alertmanager
      nodeSelector:
        node-role.kubernetes.io/infra: ""
      volumeClaimTemplate:
        spec:
          storageClassName: gp2
          resources:
            requests:
              storage: {{ALERTMANAGER_STORAGE_SIZE}}


    nodeExporter:
      baseImage: openshift/prometheus-node-exporter
    kubeRbacProxy:
      baseImage: quay.io/coreos/kube-rbac-proxy
    kubeStateMetrics:
      baseImage: quay.io/coreos/kube-state-metrics
      nodeSelector:
        node-role.kubernetes.io/infra: ""
    grafana:
      baseImage: grafana/grafana
      nodeSelector:
        node-role.kubernetes.io/infra: ""
    auth:
      baseImage: openshift/oauth-proxy
    k8sPrometheusAdapter:
      nodeSelector:
        node-role.kubernetes.io/infra: ""
metadata:
  name: cluster-monitoring-config
namespace: openshift-monitoring

1: A typical value is PROMETHEUS_RETENTION_PERIOD=15d. Units are measured in time using one of these suffixes: s, m, h, d.
2: A typical value is PROMETHEUS_STORAGE_SIZE=2000Gi. Storage values can be a plain integer or as a fixed-point integer using one of these suffixes: E, P, T, G, M, K. You can also use the power-of-two equivalents: Ei, Pi, Ti, Gi, Mi, Ki.
3: A typical value is ALERTMANAGER_STORAGE_SIZE=20Gi. Storage values can be a plain integer or as a fixed-point integer using one of these suffixes: E, P, T, G, M, K. You can also use the power-of-two equivalents: Ei, Pi, Ti, Gi, Mi, Ki.

Set the values like the retention period and storage sizes.

Apply the changes by running:

$ oc create -f cluster-monitoring-config.yml

8.2. Configuring cluster monitoring

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