System:serviceaccount:

system:serviceaccount:

system:serviceaccount: (singular) is the prefix for service account usernames.
system:serviceaccounts: (plural) is the prefix for service account groups.

system:serviceaccount:kube-system:default

system:serviceaccount:nginx-ingress:nginx-ingress-controller

Related

• system:masters
• system:
• service-account-controller
• Configuring a Kubernetes service account to assume an IAM role

See also

• Kubernetes service account, ServiceAccount:, kubectl get serviceaccounts, kubectl create serviceaccount, kubectl describe serviceaccount, kubernetes.io/service-account-token, Kubernetes users, Kubernetes groups, Kubernetes roles
• system:, system:masters, system:controller:, system:anonymous, system:serviceaccount:, system:serviceaccounts:, system:bootstrappers, system:node, system:nodes, kubectl get clusterroles