namesspace-role-rolebinding-deployment

...
apiVersion: v1
kind: Namespace 
metadata:
    name: mynamespace
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
    name: developer-acces 
    namespace: mynamespace
rules:
- apiGroups: [""] #it indicate the API group
  resources: ["pod"]
  verbs: ["get","watch","list","create"]
- apiGroups: ["","extensions","apps"]
  resources: ["deployment"]
  verbs: ["get","list","watch","create","delete"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
    name: developer-RoleBinding
    namespace: mynamespace
subjects:
- kind: User
  name: peter 
  namespace: mynamespace
  apiGroup: rbac.authorization.k8s.io
- kind: User
  name: sonja   
  namespace: mynamespace
  apiGroup: rbac.authorization.k8s.io

roleRef: #specific the binding to a role/Clusterrole
    kind: Role
    name: developer-access
    apiGroup: rbac.authorization.k8s.io
---
apiVersion: apps/v1
kind: Deployment
metadata:
    name: nginx-deployment 
    namespace: mynamespace
    labels:
        app: nginx
spec:
    replicas: 3
    selector:
        matchLabels:
            app: nginx
    template:
        metadata:
            labels:
                app: nginx
        spec:
            containers:
                - name: k8s-demo 
                  image: nginx
                  ports:
                    - name: nginx-port 
                      containerPort: 8080