How to Create a ClusterRole and RoleBinding in Kubernetes
- Last Updated On: February 15, 2024
- By: Aswin Vijayan
In this blog, we are going to see how to create a clusterrole and rolebinding in Kubernetes.
In this example, I am going to create a clusterrole and bind it to a service account.
Create ServiceAccount
First, we are going to create a ServiceAccount on the default namespace, create a YAML file sa.yaml, and copy the below content to it
apiVersion: v1
kind: ServiceAccount
metadata:
name: cluster-service-account
namespace: default
Run the following command to create the ServiceAccount
kubectl apply -f sa.yaml
This file will create a ServiceAccount cluster-service-account on the default namespace.
Create ClusterRole
Now, create a ClusterRole to attach it to the ServiceAccount, create a YAML file role.yaml, and copy the below content
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: cluster-role
namespace: default
rules:
- apiGroups: [""]
resources: ["nodes"]
verbs: ["get", "list"]
Run the following command to create a role
kubectl apply -f role.yaml
This file will create a clusterrole cluster-role on the default namespace.
Create RoleBinding
Now, that the ServiceAccount and Role have been created, the next step is to bind the Role to the ServiceAccount.
Create a YAML file rolebinding.yaml and copy the below content
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: cluster-role-binding
subjects:
- kind: ServiceAccount
name: cluster-service-account
namespace: default
roleRef:
kind: Role
name: cluster-role
apiGroup: rbac.authorization.k8s.io
Run the following to bind the clusterrole to the serviceaccount
kubectl apply -f rolebinding.yaml
This will bind the role cluster-role to the serviceaccount cluster-service-account
Conclusion
In Kubernetes, with the help of clusterrole, you can control the access given to a user on the cluster.
I hope this quick guide helps you to set up clusterrole and bind the role to a serviceaccount.
Aswin Vijayan
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