6.5. Updating Individual Hosts

Use the host upgrade manager to update individual hosts directly from the Administration Portal.

Note

The upgrade manager only checks hosts with a status of Up or Non-operational, but not Maintenance.

Limitations

  • On RHVH, the update only preserves modified content in the /etc and /var directories. Modified data in other paths is overwritten during an update.
  • If migration is enabled at the cluster level, 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.

Procedure

  1. Ensure that the correct repositories are enabled. To view a list of currently enabled repositories, run yum repolist.

    • For Red Hat Virtualization Hosts:

      # subscription-manager repos --enable=rhel-7-server-rhvh-4-rpms
    • For Red Hat Enterprise Linux hosts:

      # subscription-manager repos \
          --enable=rhel-7-server-rpms \
          --enable=rhel-7-server-rhv-4-mgmt-agent-rpms \
          --enable=rhel-7-server-ansible-2-rpms
  2. In the Administration Portal, click ComputeHosts and select the host to be updated.
  3. Click InstallationCheck for Upgrade and click OK.

    Open the Notification Drawer ( EventsIcon ) and expand the Events section to see the result.

  4. If an update is available, click InstallationUpgrade.
  5. Click OK to 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 ComputeHosts and the status transitions through these stages:

    Maintenance > Installing > Reboot > Up

    Note

    If the update fails, the host’s status changes to Install Failed. From Install Failed you can click InstallationUpgrade again.

Repeat this procedure for each host in the Red Hat Virtualization environment.

You can now change the cluster compatibility version to 4.2.