DevOps with Kubernetes - Second Edition

Using ConfigMap via environment variables

To use ConfigMap inside a pod, you'll have to use configMapKeyRef as the value source in the env section. This will populate whole ConfigMap pairs to environment variables:

# cat 3-2-3_pod_ev_configmap.yamlapiVersion: v1kind: Podmetadata:  name: configmap-evspec:  containers:    - name: configmap      image: centos      command: ["/bin/sh", "-c", "while : ;do echo $DATABASE_ENDPOINT; sleep 10; done"]      env:        - name: DATABASE_ENDPOINT          valueFrom:            configMapKeyRef:              name: example              key: database.properties// create configmap# kubectl create -f 3-2-3_pod_ev_configmap.yamlpod/configmap-ev created// check out the logs# kubectl logs configmap-evendpoint=k8s.us-east-1.rds.amazonaws.com port=1521

The Kubernetes system itself also ...