Add Environment Variables¶

Problem¶

Applications frequently rely on environment variables for runtime configuration.

These values must be injected into containers at runtime.

Step 1 — Define Environment Variables¶

Update container configuration.

deployment.yaml

env:
  - name: APP_ENV
    value: production
  - name: LOG_LEVEL
    value: info

Full example:

containers:
  - name: app
    image: nginx
    env:
      - name: APP_ENV
        value: production
      - name: LOG_LEVEL
        value: info

Step 2 — Apply Deployment¶

Run:

kubectl apply -f deployment.yaml

Step 3 — Verify Variables¶

Enter container.

kubectl exec -it <pod-name> -- /bin/sh

Check:

env

Expected:

APP_ENV=production
LOG_LEVEL=info