Managing Virtual Machines with Red Hat OpenShift Virtualization

From a command line on the workstation machine, use the oc command to log in to your OpenShift cluster as the admin user with redhatocp as the password.

Open a web browser and log in to the OpenShift web console at https://console-openshift-console.apps.ocp4.example.com.

1. From a command line, log in to your OpenShift cluster as the admin user.

   [student@workstation ~]$ oc login -u admin -p redhatocp \
     https://api.ocp4.example.com:6443
   Login Successful
   ...output omitted...

2. Open a web browser and navigate to https://console-openshift-console.apps.ocp4.example.com. Select htpasswd_provider and log in as the admin user with redhatocp as the password.

Create the dev-web-rhel8 VM template in the review-cr2 project.

1. Navigate to Virtualization → Templates and ensure that All Projects is selected in the Project list. Enter rhel8-server in the Search by Name field.

2. Click the vertical ellipsis icon ⋮ next to the rhel8-server-tiny line, and then click Clone.

3. Complete the form by using the following information and then click Clone.

   Field	Value
   Name	dev-web-rhel8
   Template project	review-cr2
   Template display name	dev-web-rhel8
   Template provider	Red Hat Training

   

4. From the dev-web-rhel8 Details page, navigate to the Disks tab.

5. Click the vertical ellipsis icon ⋮ next to the rootdisk line, and then click Detach. Click Detach to confirm.

6. Click Add disk. Complete the form by using the following information and then click Save.

   Field	Value
   Use this disk as a boot source	enabled
   Name	rootdisk
   Source	URL (creates PVC)
   URL	http://utility.lab.example.com:8080/openshift4/images/helloworld.qcow2
   Size	10 GiB
   Interface	virtio
   StorageClass	ocs-external-storagecluster-ceph-rbd-virtualization

7. Use the YAML editor to set the name of the rootdisk data volume to the name of the VM that the template creates. Navigate to the YAML tab and locate the spec.dataVolumeTemplates.metadata.name and spec.template.volumes.datavolume.name objects. Update the values of the objects to use the ${NAME} template variable and then click Save.

   apiVersion: template.openshift.io/v1
   kind: Template
   ...output omitted...
     spec:
       dataVolumeTemplates:
       - metadata:
           name: '${NAME}'
   ...output omitted...
       template:
         volumes:
         - name: rootdisk
           dataVolume:
             name: '${NAME}'
   ...output omitted...

Grant admin access to the developer user for the review-cr2 project.

1. From a command-line window on the workstation machine, use the oc create rolebinding command to grant admin access to the developer user.

   [student@workstation ~]$ oc create rolebinding admin --clusterrole=admin \
     --user=developer -n review-cr2
   rolebinding.rbac.authorization.k8s.io/admin created

2. Confirm that the developer user has admin rights.

   [student@workstation ~]$ oc get rolebindings -n review-cr2 -o wide
   NAME   ROLE               AGE   USERS      GROUPS    SERVICEACCOUNTS
   admin  ClusterRole/admin  39s   developer
   ...output omitted...

As the developer user, use the dev-web-rhel8 template to create the web1 VM in the review-cr2 namespace.

1. From the OpenShift web console, click admin → Log out.

2. Select htpasswd_provider and log in as the developer user with developer as the password.

3. Select the Administrator perspective.

4. Navigate to Virtualization → Catalog and then set the project to review-cr2.

5. Click User templates and then select the dev-web-rhel8 template.

6. Set the Virtual Machine Name field to web1 and then click Quick create VirtualMachine. Wait for the web1 VM to have the Running status.

Set the worker02 cluster node in maintenance mode and drain its workload.

1. From the command-line window on the workstation machine, use the oc adm cordon command to mark the node as unschedulable.

   [student@workstation ~]$ oc adm cordon worker02
   node/worker02 cordoned

2. Confirm that the node has the SchedulingDisabled status.

   [student@workstation ~]$ oc get nodes
   NAME       STATUS                     ROLES                         AGE   VERSION
   master01   Ready                      control-plane,master,worker   19d   v1.27.10+28ed2d7
   master02   Ready                      control-plane,master,worker   19d   v1.27.10+28ed2d7
   master03   Ready                      control-plane,master,worker   19d   v1.27.10+28ed2d7
   worker01   Ready                      worker                        19d   v1.27.10+28ed2d7
   worker02   Ready,SchedulingDisabled   worker                      19d   v1.27.10+28ed2d7

3. Run the oc adm drain command to evacuate all workloads from the node. This command might take a few minutes to complete.

   [student@workstation ~]$ oc adm drain worker02 \
     --delete-emptydir-data --ignore-daemonsets
   node/worker02 already cordoned
   ...output omitted...
   node/worker02 drained