Sidecar container pattern in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a sidecar container named 'logger' to the pod spec.

Kubernetes

containers:
  - name: app
    image: myapp:latest
  - name: [1]
    image: busybox
    command: ['sh', '-c', 'tail -f /var/log/app.log']

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

Amain

Blogger

Csidecar

Dhelper

Attempts:

3 left

💡 Hint

Common Mistakes

Using generic names like 'main' or 'helper' which don't clarify the container's role.

The sidecar container is named 'logger' to clearly indicate its role alongside the main app container.

2fill in blank

medium

Complete the code to mount a shared volume named 'shared-logs' to both containers.

Kubernetes

volumes:
  - name: shared-logs
    emptyDir: {}
containers:
  - name: app
    image: myapp:latest
    volumeMounts:
      - name: shared-logs
        mountPath: [1]
  - name: logger
    image: busybox
    volumeMounts:
      - name: shared-logs
        mountPath: /var/log

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

A/tmp

B/var/log

C/data

D/app/logs

Attempts:

3 left

💡 Hint

Common Mistakes

Using different or unrelated paths that do not align between containers.

The app container writes logs to '/app/logs', which is shared with the logger container mounted at '/var/log'.

3fill in blank

hard

Fix the error in the sidecar container's command to continuously output logs.

Kubernetes

containers:
  - name: logger
    image: busybox
    command: ['sh', '-c', [1]]

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

A'head -f /var/log/app.log'

B'cat /var/log/app.log'

C'tail -f /var/log/app.log'

D'tail /var/log/app.log'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cat' which exits immediately, stopping the container.

Using 'head -f' which is invalid.

The command 'tail -f' keeps the log output streaming continuously, which is needed for a sidecar logger.

4fill in blank

hard

Fill both blanks to define a pod with a main and sidecar container sharing a volume.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
spec:
  containers:
  - name: main-app
    image: myapp:latest
    volumeMounts:
    - name: [1]
      mountPath: /app/logs
  - name: sidecar-logger
    image: busybox
    volumeMounts:
    - name: [2]
      mountPath: /var/log
  volumes:
  - name: shared-logs
    emptyDir: {}

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

Ashared-logs

Bapp-logs

Clogs

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using different volume names for each container, breaking sharing.

Both containers mount the same volume named 'shared-logs' to share log files.

5fill in blank

hard

Fill all three blanks to complete the sidecar container spec with proper image, command, and volume mount.

Kubernetes

containers:
  - name: sidecar-logger
    image: [1]
    command: ['sh', '-c', [2]]
    volumeMounts:
      - name: shared-logs
        mountPath: [3]

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

Abusybox

B'tail -f /var/log/app.log'

C/var/log

Dnginx

Attempts:

3 left

💡 Hint

Common Mistakes

Using a web server image like 'nginx' which is not suitable for logging.

Using a command that exits immediately.

The sidecar uses the 'busybox' image, runs 'tail -f' to follow logs, and mounts the shared volume at '/var/log'.