Kubernetes for Developers

Environment variables

When defining a Pod specification, in addition to the mandatory name and image key, you can specify an env key. The environment key requires a name, and you can add a key that makes a reference using valueFrom: to get data from a ConfigMap.

For example, to expose our example configuration as an environment variable, you could add the following stanza to a Pod specification:

env:  - name: LOG_LEVEL_KEY    valueFrom:      configMapKeyRef:        name: example-config        Key: log.level

You can include multiple environment variables in the Pod specification, and each can reference a different ConfigMap if you have your configuration split up into multiple pieces to make it easier (or more sensible) to administer.

You can also map the entirety ...