Challenge, Medium,  on  Kubernetes

Mount Specific ConfigMap Keys as Files into a Node.js Deployment

Scenario

A Deployment named orders-api-reader exists in namespace production, but its Pods are failing because the application configuration is missing.

A ConfigMap named app-config exists in the same namespace and contains multiple configuration keys for a Node.js application. However, the application requires only three keys: api.url, app.port, and app.order.

The Deployment manifest is located on dev-machine:

/home/laborant/nodejs-deployment.yaml

Task

Mount only the following three keys from the app-config ConfigMap as files inside /etc/app/config using a volume named app-config-vol. No other keys from app-config should be accessible inside the Pod.

api.url
app.port
app.order

Edit /home/laborant/nodejs-deployment.yaml and apply the updated manifest after making changes.

The diagram shows only selected ConfigMap keys mounted as files inside the Pod.

The diagram shows only selected ConfigMap keys mounted as files inside the Pod.

⚠️ Add only the required YAML changes; do not modify or add anything unnecessary.

Hint 1

Use items inside the ConfigMap volume definition to mount only specific keys. Each item maps a ConfigMap key to a file path inside the mount directory.

See the official docs: Configure a Pod to Use a ConfigMap

Test Cases

How to Author Challenges on iximiuz Labs

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Install labctl CLI

curl -sf https://labs.iximiuz.com/cli/install.sh | sh

This will download and install the latest version of the labctl CLI. You only need to do this once per workstation.

Authorize labctl

labctl auth login

This will open a browser window asking you to authorize labctl to access your account. You need to do it after a fresh install of labctl and repeat it whenever the auth session expires.

Pull challenge content

labctl content pull challenge mount-specific-configmap-keys-da23a7a4

This will create a local copy of the challenge content in a directory named mount-specific-configmap-keys-da23a7a4. You only need to do this once per challenge.

Stream your changes

labctl content push -fw challenge mount-specific-configmap-keys-da23a7a4

Run this command in a separate terminal to continuously upload your changes to the server while editing the challenge in your favorite text editor or IDE.

You can also use labctl to create, list, and delete your content. Learn more about the available commands: labctl content --help

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