Wrong answer found in one of the mock test exam

Kubernetes
#1

Hi - I was writing 1st Mock exam and found an issue with the answer.

Question was -
There is a requirement to share a volume between two containers that are running within the same pod. Use the following instructions to create the pod and related objects:

  • Create a pod named grape-pod-ckad06-str.

  • The main container should use the nginx image and mount a volume called grape-vol-ckad06-str at path /var/log/nginx.

  • The sidecar container can use busybox image, you might need to add a sleep command to this container to keep it running. Next, mount the same volume called grape-vol-ckad06-str at the path /usr/src.

  • The volume should be of type emptyDir.

Answer given in the kodekloud page is -

image
image695×857 24.4 KB

How initContainer is not part of the answer as in the question it is talking about sidecar container ??

#2

A sidecar doesn’t necessarily need to use an initContainer if there’s no initial set up to do. That covers this case. Note that the the emptyDir volume is mounted as /var/log/nginx, so the nginx container will write its logs into that volume. Our sidecar isn’t actually doing anything, but a sidecar might be hooked up into a log processing application to gather logs in a central database. This might not require any specific setup either, in which case you would not need an initContainer either.