Kubernetes Cookbook - Second Edition

By environment variables

In terms of accessing Secrets inside a Pod, add env section inside the container spec as follows:

// using access-token Secret inside a Pod# cat 2-7-2_env.yamlapiVersion: v1kind: Podmetadata:  name: secret-example-envspec:  containers:  - name: ubuntu    image: ubuntu    command: ["/bin/sh", "-c", "while : ;do echo $ACCESS_TOKEN; sleep 10; done"]    env:        - name: ACCESS_TOKEN          valueFrom:            secretKeyRef:              name: access-token              key: 2-7-1_access-token// create a pod# kubectl create -f 2-7-2_env.yamlpod "secret-example-env" created

In the preceding example, we expose 2-7-1_access-token key in access-token Secret as ACCESS_TOKEN environment variable, and print it out through a while infinite loop. Check the stdout via kubectl log command: ...