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Kubernetes has an **authorization module named Role-Based Access Control** ([**RBAC**](https://kubernetes.io/docs/reference/access-authn-authz/rbac/)) that helps to set utilization permissions to the API server.
1.**Role\ClusterRole –** The actual permission. It contains _**rules**_ that represent a set of permissions. Each rule contains [resources](https://kubernetes.io/docs/reference/kubectl/overview/#resource-types) and [verbs](https://kubernetes.io/docs/reference/access-authn-authz/authorization/#determine-the-request-verb). The verb is the action that will apply on the resource.
2.**Subject (User, Group or ServiceAccount) –** The object that will receive the permissions.
3.**RoleBinding\ClusterRoleBinding –** The connection between Role\ClusterRole and the subject.
The difference between “**Roles**” and “**ClusterRoles**” is just where the role will be applied – a “**Role**” will grant access to only **one****specific****namespace**, while a “**ClusterRole**” can be used in **all namespaces** in the cluster. Moreover, **ClusterRoles** can also grant access to:
* **cluster-scoped** resources (like nodes).
* **non-resource** endpoints (like /healthz).
* namespaced resources (like Pods), **across all namespaces**.
In the template of a **Role** or a **ClusterRole** you will need to indicate the **name of the role**, the **namespace** (in roles) and then the **apiGroups**, **resources** and **verbs** of the role:
* The **apiGroups** is an array that contains the different **API namespaces** that this rule applies to. For example, a Pod definition uses apiVersion: v1. _It can has values such as rbac.authorization.k8s.io or \[\*]_.
* The **resources** is an array that defines **which resources this rule applies to**. You can find all the resources with: `kubectl api-resources --namespaced=true`
* The **verbs** is an array that contains the **allowed verbs**. The verb in Kubernetes defines the **type of action** you need to apply to the resource. For example, the list verb is used against collections while "get" is used against a single resource.
### Rules Verbs
(_This info was taken from_ [_**here**_](https://kubernetes.io/docs/reference/access-authn-authz/authorization/#determine-the-request-verb))
| GET, HEAD | get (for individual resources), list (for collections, including full object content), watch (for watching an individual resource or collection of resources) |
A **role binding****grants the permissions defined in a role to a user or set of users**. It holds a list of subjects (users, groups, or service accounts), and a reference to the role being granted. A **RoleBinding** grants permissions within a specific **namespace** whereas a **ClusterRoleBinding** grants that access **cluster-wide**.
**Permissions are additive** so if you have a clusterRole with “list” and “delete” secrets you can add it with a Role with “get”. So be aware and test always your roles and permissions and **specify what is ALLOWED, because everything is DENIED by default.**
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