Addon-manager "Reconcile" annotation deletes default-http-backend service and deployment

[addisonbair]

After deploying GLBC via deploy/glbc/script.sh, I noticed the service and deployment for the default-http-backend was getting deleted after approximately 15 seconds.

Since I don't have access to the masters (GKE) I can't be completely sure, but it appears there is a conflict between the Addon-manager running on the master and the annotations on the objects within deploy/glbc/yaml/default-http-backend.yaml. By changing the annotations to addonmanager.kubernetes.io/mode: EnsureExists from addonmanager.kubernetes.io/mode: Reconcile, the Addon-manager does not delete these objects.

[MrHohn]

Ref https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/addon-manager/README.md.

Object with addonmanager.kubernetes.io/mode=Reconcile being deleted by addon-manager is as expected. We should just remove addonmanager.kubernetes.io/mode label completely from https://github.com/kubernetes/ingress-gce/blob/master/deploy/glbc/yaml/default-http-backend.yaml given using that yaml basically means it is managed by the user but not addon-manager.