ConfigMaps

Why ConfigMaps

Keep environment-specific settings out of the container image so one image works in many environments.

Create from literals

Simple key/value example:

kubectl create configmap app-config \
  --from-literal=APP_MESSAGE=Hello \
  --from-literal=APP_COLOR=blue
kubectl get configmap app-config -o yaml

Use in a pod (concept)

Pods can load ConfigMap keys as environment variables or files. In YAML you reference the ConfigMap by name.

# Snippet idea inside a container spec:
# envFrom:
#   - configMapRef:
#       name: app-config

Not for secrets

Do not put passwords or API keys in ConfigMaps—use Secrets (next lesson) and real secret managers as you mature.