Kubernetes ConfigMap in Pods

ConfigMap spec.containers.env:

env:
- name: APP_COLOR
  valueFrom:
    configMapKeyRef: 
      name: my-cm # The ConfigMap containing the value you want to assign to APP_COLOR
      key: color  # Specify the key associated with the value

Use spec.containers.envFrom to define all of the ConfigMap's data as container environment variables. The key from the ConfigMap becomes the environment variable name in the Pod:

envFrom:
- configMapRef:
    name: special-config

Add the ConfigMap data as files to the directory specified as spec.containers.volumeMounts.mountPath.
spec.volumes:

volumes:
- name: config-volume
  configMap:
    # Provide the name of the ConfigMap containing the files you want
    # to add to the container
    name: special-config

spec.containers.volumeMounts:

volumeMounts:
- name: config-volume
  mountPath: /etc/config