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CKADApplication Design and BuildSingle nodeEasy

Init container prepares content for nginx

Scenario ckad-des-002 · about 7 minutes · 9 points · 9 grader checks

Use an init container to write content into a shared volume before the main web container starts.

  • init-container
  • multi-container
  • emptydir
  • pod

What you will practise

  • Declare an init container
  • Understand that init containers complete before app containers start
  • Share files between an init container and the main container

Start this lab

With the CLI installed and signed in, this command provisions a single node cluster on your Mac, applies the scenario setup and prints the task below.

goldenkube start ckad-des-002

Task

The task text exactly as the CLI shows it. Solve it on the cluster, then run goldenkube submit.

In namespace "init" (create it if it does not exist) create a Pod named "web-init" that prepares its content with an init container: 1. Init container "fetch", image busybox:1.36, command: sh -c 'echo ready > /work/index.html' mounting an emptyDir volume named "content" at /work. 2. Container "web", image nginx:1.27, mounting the same volume "content" at /usr/share/nginx/html. The init container must run to completion before "web" starts, the Pod must be Running and Ready, and the file the init container wrote must be nginx's index.html (/usr/share/nginx/html/index.html contains "ready").

Requirements and details

Certification
CKAD · Certified Kubernetes Application Developer
Domain
Application Design and Build
Difficulty
Easy
Cluster topology
Single node
Cluster features
None beyond the base cluster
Recommended time
7 minutes
Points
9
Grader checks
9
Kubernetes version
1.37
Minimum CLI version
0.1.0
Scenario version
1
Published

Grading runs locally: 9 state checks read your cluster when you submit; the scenario passes when every check passes. Hints, the reference solution and the check definitions are available only inside the CLI, not on this page.

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Independent community project, not affiliated with or endorsed by CNCF or The Linux Foundation. Lab results are practice feedback, not an exam score.