Managing Virtual Machines with Red Hat OpenShift Virtualization

Instructions

1. As the admin user, clone a template to the template-create namespace and name it template-create. Configure the eviction strategy as Live Migration. Configure the template to use a mariadb-server image that is hosted on a website. Configure the rootdisk to use the ocs-external-storagecluster-ceph-rbd storage class. The template must use the Server workload type. Configure the cloud-init service to create the developer user with developer as the password.

   1. Open a web browser and navigate to https://console-openshift-console.apps.ocp4.example.com.

   2. Click htpasswd_provider and log in as the admin user with redhatocp as the password.

   3. Navigate to Virtualization → Templates. Select the All Projects project from the Projects list and search for rhel8-server-small. Click the vertical ellipsis icon ⋮ and select Clone.

      Figure 6.15: Clone template

   4. In the Clone template form, change the Template name to template-create. Change the Template project to template-create. Leave the other form fields with their default values. Click Clone.

      Figure 6.16: Create template

   5. Navigate to Virtualization → Templates. Select the template-create project from the Projects list and select the template-create template.

      Figure 6.17: Find template

   6. Select the Scheduling tab and click the pencil icon under Eviction strategy. Confirm that the checkbox for Live Migration is selected, and then click Save.

      Figure 6.18: Scheduling

   7. Select the Network interfaces tab and confirm that the default interface is on the Pod Networking network and that it uses the Masquerade type.

      Figure 6.19: Network review

   8. Select the Disks tab and detach the rootdisk disk. Click the vertical ellipsis icon ⋮ next to the rootdisk line, and then click Detach. Click Detach to confirm.

      Figure 6.20: Detach disk

   9. Create a new rootdisk. Click Add disk. Complete the form by using the following information and then click Save.

      Parameters	Value
      Use this disk as a boot source	enabled
      Name	rootdisk
      Source	URL (creates PVC)
      URL	http://utility.lab.example.com:8080/openshift4/images/mariadb-server.qcow2
      Size	30 GiB
      Interface	virtio
      StorageClass	ocs-external-storagecluster-ceph-rbd

   10. Review the storage settings to confirm that the rootdisk volume storage size is 30 GiB and that it uses the ocs-external-storagecluster-ceph-rbd storage class.

       Figure 6.21: Review disks

   11. 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 object values 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...

   12. Configure Cloud-init to create the developer user with developer as the password. Select the Scripts tab and click Edit next to Cloud-init. In the User and Password fields, enter developer and then click Apply.

       Figure 6.22: Cloud-init

2. Create a VM from the template-create template.

   1. Navigate to Virtualization → Catalog. On the right panel of filter options, under Template project, select the template-create project and select the newly created template Red Hat Enterprise Linux 8 VM.

      Figure 6.23: Use template

   2. Change the VirtualMachine name to template-create-vm and click Quick create VirtualMachine.

      Figure 6.24: Name of VM

   3. Wait for the template-create-vm VM to provision and display the Running status.

      Figure 6.25: VM status

3. Access the template-create-vm VM.

   1. Navigate to Virtualization → VirtualMachines.

   2. Click the template-create-vm link to access the Overview tab for the VM.

   3. Navigate to the Console tab. Wait for the console to display the login prompt.

      Figure 6.26: VM console

   4. Use the console to log in as the developer user with developer as the password.

      template-create-vm login: developer
      Password: developer
      [developer@template-create-vm ~]$

   5. Confirm that the preconfigured database, sakila, is available. Use the mysql command to log in as the devuser with developer as the password.

      [developer@template-create-vm ~]$ mysql sakila -u devuser -p
      Enter password: developer
      Welcome to the MariaDB monitor. Command end with ; or \g.
      ...output omitted...
      MariaDB [sakila]>

   6. Exit the sakila database and the template-create-vm VM.

      MariaDB [sakila]> EXIT;
      Bye
      [developer@template-create-vm ~]$ exit

4. Delete the template-create-vm VM and the template-create template.

   1. Navigate to Virtualization → VirtualMachines.

   2. Click the vertical ellipsis icon to the right of the template-create-vm VM and select Delete. Click Delete in the confirmation window.

      Figure 6.27: Delete VM

   3. Navigate to Virtualization → Templates.

   4. Click the vertical ellipsis icon to the right of the template-create template row, and click Delete Template. Click Delete in the confirmation window.

      Figure 6.28: Delete template