The GKE certificates controller is responsible for monitoring certificate signing requests and (potentially) auto-approving and signing them within GKE.

A binary that can morph into all of the other kubernetes binaries.

apiserver is the main api server and master for the cluster.

The controller manager is responsible for monitoring replication controllers, and creating corresponding pods to achieve the desired state.

The kubelet binary is responsible for maintaining a set of containers on a particular host VM.