RBAC Example for Developer per Namespace

rbac-example.sh

export DEV_EMAIL=developer@example.com
export DEV_USERNAME=developer
export ADMIN_EMAIL=admin@example.com
export ADMIN_USERNAME=admin

# Grant the admin the ability to create new roles+bindings
kubectl create clusterrolebinding --clusterrole=cluster-admin --user=$ADMIN_EMAIL admin-$ADMIN_USERNAME

# Create RBAC resources to on
cat > dev-rbac.yaml <<EOF
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: dev-user
  namespace: $DEV_USERNAME
subjects:
- kind: User
  name: $DEV_EMAIL
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: Role
  name: namespace-admin
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: namespace-admin
  namespace: $DEV_USERNAME
rules:
- apiGroups: [""]
  resources: ["*"]
  verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: cluster-viewer
subjects:
  - kind: User
    name: $DEV_EMAIL
    apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: view
  apiGroup: rbac.authorization.k8s.io
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: cluster-viewer
subjects:
  - kind: User
    name: $DEV_EMAIL
    apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: view
  apiGroup: rbac.authorization.k8s.io
EOF
kubectl apply -f rbac.yaml