This small cheat sheet is about “how you update a master node of an IBM Cloud OpenShift cluster” and it is also related to an older blog post I wrote called Using a Red Hat OpenShift cluster on IBM Cloud some basic thoughts. (Link to the IBM Cloud documentation)
Step 1: Login to your IBM Cloud account where your cluster exists
export CLUSTERNAME=XXXX
ibmcloud login (--sso)
Step 2: Get cluster configuration
ibmcloud oc cluster config -c $CLUSTERNAME --admin
- Example output:
OK
The configuration for $CLUSTERNAME was downloaded successfully.
Added context for $CLUSTERNAME to the current kubeconfig file.
You can now execute 'kubectl' commands against your cluster. For example, run 'kubectl get nodes'.
If you are accessing the cluster for the first time, 'kubectl' commands might fail for a few seconds while RBAC synchronizes.
Step 3: Get cluster configuration
Get a basic overview of your current cluster configuration.
ibmcloud oc cluster get -c $CLUSTERNAME
- Example output:
Retrieving cluster $CLUSTERNAME...
OK
Name: XXXXX
ID: XXXX
State: warning
Status: Some Workers Not Normal
Created: 2021-XX-03 17:32:08 +0100 (X month ago)
Resource Group ID: XXXX
Resource Group Name: Default
Pod Subnet: XX.17.0.0/18
Service Subnet: XX.21.0.0/16
Workers: 6
Worker Zones: eu-de-1
Ingress Subdomain: XXXXX.eu-de.containers.appdomain.cloud
Ingress Secret: XXXXX
Ingress Status: healthy
Ingress Message: All Ingress components are healthy
Public Service Endpoint URL: https://XXXXX.eu-de.containers.cloud.ibm.com:3XXX
Private Service Endpoint URL: https://XXXXX.private.eu-de.containers.cloud.ibm.com:3XXX
Pull Secrets: enabled in the default namespace
VPCs: XXXXX
Master
Status: Ready (1 month ago)
State: deployed
Health: normal
Version: 4.8.21_1537_openshift
Location: Frankfurt
URL: https://XXXXX.eu-de.containers.cloud.ibm.com:30160
Step 4: Update master node
ibmcloud oc cluster master update --cluster $CLUSTERNAME
- Example output:
Checking for the default Kubernetes version...
During the update, you cannot access or change the cluster. Worker nodes, apps, and resources that have been deployed by the user are not modified and will continue to run.
You might need to change your YAML files for future deployments. Review the docs for details: 'https://ibm.biz/iks-versions'.
Are you sure you want to update your Kubernetes API server sag-operation-eu-de-1-bx2.16x64 to 4.8.21_openshift? [y/N]>
I hope this was useful for you and let’s see what’s next?
Greetings,
Thomas
#ibmcloud , #ibmcloudcli, #openshift
Thomas Suedbroecker's Blog 
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