7.8. Updating Individual Hosts
Use the host upgrade manager to update individual hosts directly from the Administration Portal.
The upgrade manager only checks hosts with a status of Up or Non-operational, but not Maintenance.
On RHVH, the update only preserves modified content in the
/vardirectories. Modified data in other paths is overwritten during an update.
- If the cluster has migration enabled, virtual machines are automatically migrated to another host in the cluster. Update a host when its usage is relatively low.
- In a self-hosted engine environment, the Manager virtual machine can only migrate between self-hosted engine nodes in the same cluster. It cannot migrate to standard hosts.
- The cluster must have sufficient memory reserved for its hosts to perform maintenance. Otherwise, virtual machine migrations will hang and fail. You can reduce the memory usage of host updates by shutting down some or all virtual machines before updating hosts.
- Do not update all hosts at the same time, as one host must remain available to perform Storage Pool Manager (SPM) tasks.
- You cannot migrate a pinned virtual machine (such as a virtual machine using a vGPU) to another host. Pinned virtual machines must be shut down before updating the host.
Ensure that the correct repositories are enabled. To view a list of currently enabled repositories, run
For Red Hat Virtualization Hosts:
# subscription-manager repos --enable=rhvh-4-for-rhel-8-x86_64-rpms
For Red Hat Enterprise Linux hosts:
# subscription-manager repos \ --enable=rhel-8-for-x86_64-baseos-rpms \ --enable=rhel-8-for-x86_64-appstream-rpms \ --enable=rhv-4-mgmt-agent-for-rhel-8-x86_64-rpms \ --enable=advanced-virt-for-rhel-8-x86_64-rpms \ --enable=fast-datapath-for-rhel-8-x86_64-rpms
- In the Administration Portal, click → and select the host to be updated.
Click→ and click .
Open the Notification Drawer ( ) and expand the Events section to see the result.
- If an update is available, click → .
Clickto update the host. Running virtual machines are migrated according to their migration policy. If migration is disabled for any virtual machines, you are prompted to shut them down.
The details of the host are updated in→ and the status transitions through these stages:
Maintenance > Installing > Reboot > UpNote
If the update fails, the host’s status changes to Install Failed. From Install Failed you can click → again.
Repeat this procedure for each host in the Red Hat Virtualization environment.
You should update the hosts from the Administration Portal. However, you can update the hosts using
dnf upgrade instead.