7.2.3. Generalizing a VM image

Procedure

1. Stop the RHEL VM if it is running, by entering the following command:

   $ virtctl stop <my_vm_name>

2. Optional: Clone the virtual machine to avoid losing the data from your original VM. You can then generalize the cloned VM.

3. Retrieve the dataVolume that stores the root filesystem for the VM by running the following command:

   $ oc get vm <my_vm_name> -o jsonpath="{.spec.template.spec.volumes}{'\n'}"

   Example output:

   [{"dataVolume":{"name":"<my_vm_volume>"},"name":"rootdisk"},{"cloudInitNoCloud":{...}]

4. Retrieve the persistent volume claim (PVC) that matches the listed dataVolume by running the followimg command:

   $ oc get pvc

   Example output:

   NAME            STATUS   VOLUME  CAPACITY   ACCESS MODES  STORAGECLASS     AGE
   <my_vm_volume> Bound  …

   참고

   If your cluster configuration does not enable you to clone a VM, to avoid losing the data from your original VM, you can clone the VM PVC to a data volume instead. You can then use the cloned PVC to create a boot source image.

   If you are creating a boot source image by cloning a PVC, continue with the next steps, using the cloned PVC.

5. Deploy a new interactive container with libguestfs-tools and attach the PVC to it by running the following command:

   $ virtctl guestfs <my-vm-volume> --uid 107

   This command opens a shell for you to run the next command.

6. Remove all configurations specific to your system by running the following command:

   $ virt-sysprep -a disk.img

7. In the OpenShift Container Platform console, click Virtualization Catalog.
8. Click Add volume.

9. In the Add volume window:

   1. From the Source type list, select Use existing Volume.
   2. From the Volume project list, select your project.
   3. From the Volume name list, select the correct PVC.
   4. In the Volume name field, enter a name for the new boot source image.
   5. From the Preference list, select the RHEL version you are using.
   6. From the Default Instance Type list, select the instance type with the correct CPU and memory requirements for the version of RHEL you selected previously.
   7. Heterogeneous clusters only: From the Architecture list, select the architecture that corresponds with the selected volume.
   8. Click Save.