Kubernetes Cookbook - Second Edition

Using ConfigMaps

Here is an example of using ConfigMaps:

# cat configmap/2-7-4_configmap.yamlapiVersion: v1kind: ConfigMapmetadata:  name: config-exampledata:  app.properties: |    name=kubernetes-cookbook    port=443// create configmap# kubectl create -f configmap/2-7-4_configmap.yamlconfigmap "config-example" created

Similar to Secret, ConfigMaps can be retrieved with environment variables or volumes:

# cat configmap/2-7-4_env.yamlapiVersion: v1kind: Podmetadata:  name: configmap-envspec:  containers:    - name: configmap      image: ubuntu      command: ["/bin/sh", "-c", "while : ;do echo $APP_NAME; sleep 10; done"]      env:        - name: APP_NAME          valueFrom:            configMapKeyRef:              name: config-example              key: app.properties// create the pod#kubectl create -f configmap/2-7-4_env.yaml ...