configmapcontroller

This controller watches for changes to ConfigMap objects and performs rolling upgrades on their associated deployments,daemonsets or statefulsets for apps which are not capable of watching the ConfigMap and updating dynamically.

This is particularly useful if the ConfigMap is used to define environment variables - or your app cannot easily and reliably watch the ConfigMap and update itself on the fly.

How to use configmapcontroller

For an object(DaemonSet, Deployment, StatefulSet) called foo have a ConfigMap called foo. Then add this annotation to your manifest:

metadata:
  annotations:
    configmap.fabric8.io/update-on-change: "foo"

Then, providing configmapcontroller is running, whenever you edit the ConfigMap called foo the configmapcontroller will update the Deployment, StatefulSet or DaemonSet by labeling it and hence triggering a rolling update on the object provided that .spec.updateStrategy.type is set to RollingUpdate.

The label would be

FABRICB_FOO_REVISION=${configMapRevision}