Can someone please help me to understand where *"system:master group"* is defin . . .

Kubernetes-Slack Discussions
#1

Ravi Paragi:
Can someone please help me to understand where “system:master group” is defined in the below clusterrolebinding -

kubectl describe <http://clusterrolebindings.rbac.authorization.k8s.io|clusterrolebindings.rbac.authorization.k8s.io> cluster-admin 
Name:         cluster-admin
Labels:       <http://kubernetes.io/bootstrapping=rbac-defaults|kubernetes.io/bootstrapping=rbac-defaults>
Annotations:  <http://rbac.authorization.kubernetes.io/autoupdate|rbac.authorization.kubernetes.io/autoupdate>: true
Role:
  Kind:  ClusterRole
  Name:  cluster-admin
Subjects:
  Kind   Name            Namespace
  ----   ----            ---------
  Group  system:masters
#2

Gurudutt Dongre:
Pls look into the Subjects: sections and under name you will see system:masters

#3

Ravi Paragi:
@Gurudutt Dongre - got it, but my question is where “system:master group” is defined ?

#4

Gurudutt Dongre:
As far as I have understood thats the group built into Kubernetes source code which gives one unlimited access to the cluster.