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Question 51

You work for a Travel company and your travel portal application is a collection of microservices that run on Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE).

You have noticed that Oracle has published a newer image of the Operating System (OS) for worker nodes. You want to upgrade your worker nodes to the latest version of the OS, at the same time ensuring that the application does not face any downtime.

Which procedure should you follow to upgrade without application downtime?

1. Create a new node pool using the latest available OS image

2. Run kubectl taint nodes --all node-role.kubernetes.io/master-

3. Delete the old node pool

1. Run kubectl cordon against all the worker nodes in the old pool to stop any new application pods to get scheduled

2. Run kubectl drain --delete-local-data –force –ignore-daemonsets to evict any Pods that are running

3. Download the patches for the new OS image

4. Patch the worker nodes to the latest OS image

1. Create a new node pool using the latest available OS image

2. Run kubectl cordon against all the worker nodes in the old pool to stop any new application pods to get scheduled

3. Run kubectl drain --delete-local-data –force –ignore-daemonsets to evict any Pods that are running

4. Delete the old node pool

1. Shutdown the worker nodes

2. Create a new node pool

3. Manually schedule the pods on the newly built node pool

Correct Answer: C

To upgrade your worker nodes without any downtime, the best approach is to create a new node pool using the latest OS image, then stop any new application pods from being scheduled on the old nodes using kubectl cordon. Next, evict any currently running pods on the old nodes with kubectl drain, and finally, delete the old node pool. This sequence ensures that your application remains operational while the upgrade is taking place.

Discussion

daws08322Option: C

c is correct https://docs.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengupgradingimageworkernode.htm