15.5. Updating the default machine type for hosts after an upgrade to RHOSP 17

Procedure

1. Log in to the undercloud as the stack user.

2. Source the stackrc file.

   $ source ~/stackrc

3. Log in to a Controller node as the heat-admin user:

   (undercloud)$ metalsmith list
   $ ssh heat-admin@<controller_ip>

   Replace <controller_ip> with the IP address of the Controller node.

4. Retrieve the list of instances that have no machine type set:

   [heat-admin@<controller_ip> ~]$ sudo podman exec -i -u root nova_api \
     nova-manage libvirt list_unset_machine_type

5. Check the NovaHWMachineType parameter in the nova-hw-machine-type-upgrade.yaml file for the default machine type for the instance host. The default value for the NovaHWMachineType parameter in RHOSP 16.2 is as follows:

   x86_64=pc-i440fx-rhel7.6.0,aarch64=virt-rhel7.6.0,ppc64=pseries-rhel7.6.0,ppc64le=pseries-rhel7.6.0

6. Update the system metadata of each instance with the default instance machine type:

   [heat-admin@<controller_ip> ~]$ sudo podman exec -i -u root nova_api \
     nova-manage libvirt update_machine_type <instance_uuid> <machine_type>

   • Replace <instance_uuid> with the UUID of the instance.

   • Replace <machine_type> with the machine type to record for the instance.

     주의

     If you set the machine type to something other than the machine type of the image on which the instance was booted, the existing instance might fail to boot.

7. Confirm that the machine type is recorded for all instances:

   [heat-admin@<controller_ip> ~]$ sudo podman exec -i -u root nova_api \
     nova-status upgrade check

   This command returns a warning if an instance is found without a machine type. If you get this warning, repeat this procedure from step 4.

8. Change the default value of NovaHWMachineType in a Compute environment file to x86_64=q35 and deploy the overcloud.

Verification

1. Create an instance that has the default machine type:

   (overcloud)$ openstack server create --flavor <flavor> \
     --image <image> --network <network> \
     --wait defaultMachineTypeInstance

   • Replace <flavor> with the name or ID of a flavor for the instance.
   • Replace <image> with the name or ID of an image that does not set hw_machine_type.
   • Replace <network> with the name or ID of the network to connect the instance to.

2. Verify that the instance machine type is set to the default value:

   [heat-admin@<controller_ip> ~]$ sudo podman exec -i -u root nova_api \
     nova-manage libvirt get_machine_type <instance_uuid>

   Replace <instance_uuid> with the UUID of the instance.

3. Hard reboot an instance with a machine type of x86_64=pc-i440fx:

   (overcloud)$ openstack server reboot --hard <instance_uuid>

   Replace <instance_uuid> with the UUID of the instance.

4. Verify that the instance machine type has not been changed:

   [heat-admin@<controller_ip> ~]$ sudo podman exec -i -u root nova_api \
     nova-manage libvirt get_machine_type <instance_uuid>

   Replace <instance_uuid> with the UUID of the instance.