Environment Variables and Config Injection

Environment variables in Kubernetes allow you to inject configuration values into containers at runtime.

Static Environment Variables:

env:
- name: ENVIRONMENT
  value: production

Dynamic from ConfigMaps:

env:
- name: APP_MODE
  valueFrom:
    configMapKeyRef:
      name: app-config
      key: APP_MODE

Dynamic from Secrets:

env:
- name: DB_PASSWORD
  valueFrom:
    secretKeyRef:
      name: db-secret
      key: password

Injecting configs this way keeps your application code clean and your configurations centralized.