This post will explain you about What is Kubernetes ClusterRole. It is a simplied information of Kubernetes ClusterRole.
Kubernetes ClusterRole is also one of the important objects available in Kubernetes that plays main role in managing the access control of Kubernetes resources. In this article, we will look into ClusterRole, what is Clusterrole, and how Clusterrole works.
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What is Kubernetes ClusterRole?
Kubernetes ClusterRole is a set of permissions that we define what a user, group, or service account can do within a Kubernetes cluster. It is used to control and manage access to Kubernetes resources, such as pods, nodes, namespaces, and services. Kubernetes ClusterRole is a powerful kubernetes objects that allows cluster administrators to provide or remove access to specific resources or operations within the kubernetes cluster.
Understanding Kubernetes ClusterRole
Mostly, all kubernetes resources or objects defined in YAML file. Similarly, Kubernetes ClusterRole is also defined in YAML file, and it will contain set of rules where we define the permissions for the role. The ClusterRole can then be assigned to users, groups, or service accounts using a Kubernetes RoleBinding. ClusterRoles can be categorized into two types: pre-defined ClusterRoles and custom ClusterRoles.
Pre-defined ClusterRoles
Kubernetes provides several types of pre-defined ClusterRoles that can be used to assign permissions to users, groups, or service accounts. These ClusterRoles include:
- cluster-admin: This ClusterRole has full control of the cluster resources and is meant for cluster administrators.
- system: This ClusterRole provides access to the Kubernetes system resources, such as nodes and namespaces.
- edit: This ClusterRole provides read and write access to most of the objects in a namespace.
- view: This ClusterRole provides read-only access to most of the objects in a namespace.
Custom ClusterRoles
Kubernetes Custom ClusterRoles are ClusterRoles that are defined by the user. They can be created for specific needs and can be used to grant or revoke access to specific resources or operations within the cluster. To create a custom ClusterRole, you can use the following clusterrole options along with kubectl command:
kubectl create clusterrole <clusterrole-name> --verb=<verb> --resource=<resource> --namespace=<namespace>
In the above command, you need to replace the <clusterrole-name>, <verb>, <resource>, and <namespace> placeholders with the actual values.
Using Kubernetes ClusterRole
Once the Kubernetes ClusterRole is created, you can use the RoleBinding to assign the Kubernetes ClusterRole to a user, group, or service account. To create a RoleBinding, again you can use the kubectl command along with rolebinding option this time:
kubectl create rolebinding <rolebinding-name> --clusterrole=<clusterrole-name> --user=<user> --group=<group> --serviceaccount=<serviceaccount> --namespace=<namespace>
In the above command, you need to replace the <rolebinding-name>, <clusterrole-name>, <user>, <group>, <serviceaccount>, and <namespace> placeholders with the actual values.
So, Kubernetes ClusterRole is also one of the important Kubernetes resources that plays a main role in managing the access control of Kubernetes resources. It allows cluster administrators to grant or revoke access to specific resources or operations within the cluster.
In this post, we have discussed what is Kubernetes ClusterRole, how Kubernetes Clusterrole works, and how to use Kubernetes Clusterrole. Hope you had better idea about kubernetes clusterrole.
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