OOMKilled containers in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to check pods that were OOMKilled.

Kubernetes

kubectl get pods --field-selector status.phase=Failed -o json | jq '.items[] | select(.status.containerStatuses[].state.terminated.reason == "[1]") | .metadata.name'

Drag options to blanks, or click blank then click option'

ACompleted

BCrashLoopBackOff

COOMKilled

DError

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'CrashLoopBackOff' instead of 'OOMKilled'.

Using 'Error' which is too generic.

The reason for containers killed due to out-of-memory is OOMKilled.

2fill in blank

medium

Complete the YAML snippet to set memory limit to 256Mi for a container.

Kubernetes

resources:
  limits:
    memory: [1]

Drag options to blanks, or click blank then click option'

A256MB

B256Mi

C256mb

D256M

Attempts:

3 left

💡 Hint

Common Mistakes

Using '256MB' which is invalid in Kubernetes YAML.

Using lowercase units like 'mb'.

In Kubernetes, memory limits use Mi (mebibytes) notation, so 256Mi is correct.

3fill in blank

hard

Fix the error in the command to describe a pod named 'webapp' in namespace 'prod'.

Kubernetes

kubectl describe pod [1] -n prod

Drag options to blanks, or click blank then click option'

Aprod

Bpod/webapp

C--webapp

Dwebapp

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prod' as pod name.

Using '--webapp' which is invalid flag.

The pod name is passed directly without prefix or flags. So just webapp is correct.

4fill in blank

hard

Fill both blanks to create a pod spec with memory request 128Mi and limit 256Mi.

Kubernetes

resources:
  requests:
    memory: [1]
  limits:
    memory: [2]

Drag options to blanks, or click blank then click option'

A128Mi

B256Mi

C512Mi

D64Mi

Attempts:

3 left

💡 Hint

Common Mistakes

Setting requests higher than limits.

Using invalid memory units.

Memory requests should be lower or equal to limits. Here, 128Mi request and 256Mi limit is correct.

5fill in blank

hard

Fill all three blanks to create a pod spec with container name 'app', memory request 100Mi, and limit 200Mi.

Kubernetes

containers:
- name: [1]
  resources:
    requests:
      memory: [2]
    limits:
      memory: [3]

Drag options to blanks, or click blank then click option'

Aapp

B100Mi

C200Mi

Dweb

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong container name.

Swapping request and limit values.

The container name is 'app', with memory request 100Mi and limit 200Mi as per spec.