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9.2. Upgrading the Red Hat Gluster Storage Pods
Following are the steps for updating a DaemonSet for glusterfs:
- Execute the following command to delete the DeamonSet:
# oc delete ds <ds-name> --cascade=false
Using--cascade=falseoption while deleting the old DaemonSet does not delete the gluster pods but deletes only the DaemonSet. After deleting the old DaemonSet, you must load the new one. When you manually delete the old pods, the new pods which are created will have the configurations of the new DaemonSet.For example,# oc delete ds glusterfs --cascade=false daemonset "glusterfs" deleted
- Execute the following commands to verify all the old pods are up:
# oc get pods
For example,# oc get pods NAME READY STATUS RESTARTS AGE glusterfs-0h68l 1/1 Running 0 3d glusterfs-0vcf3 1/1 Running 0 3d glusterfs-gr9gh 1/1 Running 0 3d heketi-1-zpw4d 1/1 Running 0 3h storage-project-router-2-db2wl 1/1 Running 0 4d
- Execute the following command to delete the old glusterfs template:
# oc delete templates glusterfs
For example,# oc delete templates glusterfs template “glusterfs” deleted
- Execute the following command to register new gluster template:
# oc create -f /usr/share/heketi/templates/glusterfs-template.yaml
For example,# oc create -f /usr/share/heketi/templates/glusterfs-template.yaml template “glusterfs” created
- Execute the following commands to start the gluster DeamonSet:
# oc process glusterfs | oc create -f -
For example,# oc process glusterfs | oc create -f - Deamonset “glusterfs” created
- Execute the following command to identify the old gluster pods that needs to be deleted:
# oc get pods
For example,# oc get pods NAME READY STATUS RESTARTS AGE glusterfs-0h68l 1/1 Running 0 3d glusterfs-0vcf3 1/1 Running 0 3d glusterfs-gr9gh 1/1 Running 0 3d heketi-1-zpw4d 1/1 Running 0 3h storage-project-router-2-db2wl 1/1 Running 0 4d
- Execute the following command to delete the old gluster pods:
# oc delete pod <gluster_pod>
For example,# oc delete pod glusterfs-0vcf3 pod “glusterfs-0vcf3” deleted
The delete pod command will terminate the old pod and create a new pod. Run# oc get pods -wand check theAgeof the pod andREADYstatus should be 1/1. The following is the example output showing the status progression from termination to creation of the pod.# oc get pods -w NAME READY STATUS RESTARTS AGE glusterfs-0vcf3 1/1 Terminating 0 3d … # oc get pods -w NAME READY STATUS RESTARTS AGE glusterfs-pqfs6 0/1 ContainerCreating 0 1s … # oc get pods -w NAME READY STATUS RESTARTS AGE glusterfs-pqfs6 1/1 Running 0 2m
- Repeat Step 7 to delete all the gluster pods.
Gluster pods should follow rolling upgrade. Hence, you must ensure that the new pod is running before deleting the next old gluster pod. In this release, we support. WithOnDelete StrategyDaemonSet update strategyOnDelete Strategyupdate strategy, after you update a DaemonSet template, new DaemonSet pods will only be created when you manually delete old DaemonSet pods. - Execute the following command to verify that the pods are running:
# oc get pods
For example,# oc get pods NAME READY STATUS RESTARTS AGE glusterfs-j241c 1/1 Running 0 4m glusterfs-pqfs6 1/1 Running 0 7m glusterfs-wrn6n 1/1 Running 0 12m heketi-1-zpw4d 1/1 Running 0 4h storage-project-router-2-db2wl 1/1 Running 0 4d
- Execute the following command to verify if you have upgraded the pod to the latest version:
# oc rsh <gluster_pod_name> glusterd --version
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