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E.3. Enabling Gluster Block Storage as Backend for Metrics


Follow the tasks mentioned below to enable Gluster Block Storage as backend for metrics

Note

By default, since Container Native Storage performs three-way replication, data will be available to the restarted node from anywhere in the cluster. As a result, it is recommended that Cassandra-level replication is turned off to avoid capacity overhead
  1. The openshift_metrics_cassandra_storage_type ansible variable should be set to dynamic:
    [OSEv3:vars]openshift_metrics_cassandra_storage_type=dynamic
    Copy to Clipboard Toggle word wrap
    For example, a sample set of variables for openshift_metrics_ are listed below.
    openshift_metrics_cassandra_storage_type=dynamic
    openshift_metrics_cassandra_pvc_size=5G
    openshift_metrics_cassandra_replicas=3
    openshift_metrics_cassandra_limits_memory=2G
    openshift_metrics_cassandra_nodeselector={'region':'infra'}
    openshift_metrics_hawkular_nodeselector={'region':'infra'}
    openshift_metrics_heapster_nodeselector={'region':'infra'}
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  2. To verify, execute the following command:
    # oc get pods --n openshift-infra
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    It should list the following pods running:
    heapster-cassandra
    heapster-metrics
    hawkular-&*9
    Copy to Clipboard Toggle word wrap
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