Certified Kubernetes Administrator CKA — Question 13

Topic 1 · Question 13 of 23

Topic 1 · Question 13

SIMULATION - Context - An existing Pod needs to be integrated into the Kubernetes built-in logging architecture (e.g. kubectl logs). Adding a streaming sidecar container is a good and common way to accomplish this requirement. Task - Add a sidecar container named sidecar, using the busybox image, to the existing Pod big-corp-app. The new sidecar container has to run the following command: Use a Volume, mounted at /var/log, to make the log file big-corp-app.log available to the sidecar container.

Suggested solution

kubectl get pod big-corp-app -o yaml > pod.yaml
# Recreate the Pod with an emptyDir mounted at /var/log in both containers and add:
# - name: sidecar
#   image: busybox
#   args: [/bin/sh, -c, 'tail -n+1 -F /var/log/big-corp-app.log']
#   volumeMounts: [{name: varlog, mountPath: /var/log}]
kubectl replace --force -f pod.yaml
kubectl logs big-corp-app -c sidecar

The shared emptyDir lets the sidecar continuously stream the main container's log file; the omitted command is recovered from the discussion and screenshot.

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