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
- To enable metrics in Openshift Container platform, see https://access.redhat.com/documentation/en-us/openshift_container_platform/3.6/html-single/installation_and_configuration/#install-config-cluster-metrics
- The
openshift_metrics_cassandra_storage_type
ansible variable should be set todynamic
:[OSEv3:vars]openshift_metrics_cassandra_storage_type=dynamic
[OSEv3:vars]openshift_metrics_cassandra_storage_type=dynamic
Copy to Clipboard Copied! 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'}
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'}
Copy to Clipboard Copied! - Run the Ansible playbook. For more information, see https://access.redhat.com/documentation/en-us/openshift_container_platform/3.6/html-single/installation_and_configuration/#install-config-cluster-metrics.
- To verify, execute the following command:
oc get pods --n openshift-infra
# oc get pods --n openshift-infra
Copy to Clipboard Copied! It should list the following pods running:heapster-cassandra heapster-metrics hawkular-&*9
heapster-cassandra heapster-metrics hawkular-&*9
Copy to Clipboard Copied!
Note
For more information regarding metrics storage considerations, see https://access.redhat.com/documentation/en-us/openshift_container_platform/3.6/html-single/installation_and_configuration/#metrics-data-storage.