Demo Setting up user contexts projectwise

In this demo, we’ll walk through setting up user contexts by defining a user with read-only access. This approach is particularly useful when a user needs to monitor and review resources—such as drafting reports—without having permissions to modify them.

Step 1: Create a New User

Begin by creating a new user named MikeUser. Run the following command:

PS C:\Users\mike\Desktop> oc create user mikeuser
user.user.openshift.io/mikeuser created
PS C:\Users\mike\Desktop> oc get user mikeuser
NAME       UID
mikeuser   eaf722-de5b-4c0e-8a25-3b205a24167c
PS C:\Users\mike\Desktop> oc describe user mikeuser
Name:         mikeuser
Created:      13 seconds ago
Labels:       <none>
Annotations:  <none>
Identities:   <none>

Step 2: Define a ClusterRole for Read-Only Access

Next, create a ClusterRole that grants read-only permissions to Pods. The YAML snippet below defines a ClusterRole named mikesreaduser that allows the user to “get,” “watch,” and “list” Pods:

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: mikesreaduser
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "watch", "list"]

Step 3: Bind the ClusterRole to the User

After defining the ClusterRole, bind it to MikeUser using a ClusterRoleBinding. Remember, the RBAC API is case sensitive, so ensure that the subject’s kind is capitalized as “User.” The complete YAML configuration, including both the ClusterRole and the ClusterRoleBinding, is provided below:

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: mikesreaduser
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "watch", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: mike-can-read-pods
subjects:
- kind: User
  name: mikeuser
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: mikesreaduser
  apiGroup: rbac.authorization.k8s.io

Save the above configuration to a file (e.g., role.yaml) and apply it by running:

PS C:\Users\mike\Desktop> oc apply -f .\role.yaml

If you encounter an error similar to:

clusterrole.rbac.authorization.k8s.io/mikesreaduser created
The ClusterRoleBinding "mike-can-read-pods" is invalid: subjects[0].kind: Unsupported value: "user": supported values: "ServiceAccount", "User", "Group"
PS C:\Users\mike\Desktop>

This indicates a case sensitivity issue. Make sure to use “User” (capitalized) as the subject’s kind in the ClusterRoleBinding.

Step 4: Verify the Configuration

After applying the YAML configuration, verify the setup by inspecting the ClusterRoleBinding. The sample output below confirms that MikeUser has an attached role binding, granting read-only access to Pods cluster-wide:

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: mike-can-read-pods
  uid: f6951a98-d8f2-4f4d-80de-74c66f7206e
  resourceVersion: '72095'
  creationTimestamp: '2022-09-20T11:53:02Z'
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: >-
      {"apiVersion":"rbac.authorization.k8s.io/v1","kind":"ClusterRoleBinding","metadata":{"annotations":{},"creationTimestamp":"2022-09-20T11:53:02Z","name":"mike-can-read-pods","resourceVersion":"72095","uid":"f6951a98-d8f2-4f4d-80de-74c66f7206e"},"roleRef":{"apiGroup":"rbac.authorization.k8s.io","kind":"ClusterRole","name":"mikesreaduser"},"subjects":[{"kind":"User","apiGroup":"rbac.authorization.k8s.io","name":"mikeuser"}]}
managedFields: ...
subjects:
  - kind: User
    apiGroup: rbac.authorization.k8s.io

After refreshing your cluster view, you should see that MikeUser now has the appropriate role binding to view Pods across the entire cluster.

This configuration is ideal for monitoring purposes, ensuring that users can review resources without risking unintended modifications.

Happy monitoring!

Introduction

Pre-Requisite – Docker and Kubernetes

Getting Started with Openshift

Openshift Concepts – Projects and Users

Concepts – Builds and Deployments

Networks, Services, Routes and Scaling

Storage, Templates and Catalog

Openshift Security

Conclusion and APPENDIX

Demo Setting up user contexts projectwise

Step 1: Create a New User

Step 2: Define a ClusterRole for Read-Only Access

Step 3: Bind the ClusterRole to the User

Step 4: Verify the Configuration

Watch Video

​Step 1: Create a New User

​Step 2: Define a ClusterRole for Read-Only Access

​Step 3: Bind the ClusterRole to the User

​Step 4: Verify the Configuration

Watch Video

Step 1: Create a New User

Step 2: Define a ClusterRole for Read-Only Access

Step 3: Bind the ClusterRole to the User

Step 4: Verify the Configuration