Removing Old HostedEngine Virtual Machine from Restored Self-Hosted Engine Environment and Enabling New HostedEngine Virtual Machine in the Manager.

Environment

• Red Hat Enterprise Virtualization 3.5

Issue

• After This content is not included.restoring HostedEngine Virtual Machine (HE VM) from Restored Self-Hosted Engine Environment, the original HE VM shows up in the Admin Portal as Unmanaged VM and cannot be removed.
• This old machine is not in use anymore and needs to be removed from the setup.
• The new HE VM is up and running, but cannot be migrated between the HE hosts.

Resolution

Note: in RHEV 3.6, the location of vm.conf is different, and it is: /var/run/ovirt-hosted-engine-ha/vm.conf. And this can be verified in /etc/ovirt-hosted-engine/hosted-engine.conf.

• Adjust present HostedEngine virtual machine setting and reconfigure database.

   On first HostedEngine host:
   
   1. Place the hosts into global maintenance mode:

      # hosted-engine --set-maintenance --mode=global

   2. Edit vmName entry of the vm.conf  change vmname:

      # vi /etc/ovirt-hosted-engine/vm.conf
      Before: 'vmName=HostedEngine'
      After: 'vmName=NewHostedEngine'

   3. Copy the vm.conf to all relevant hosts:

      # scp /etc/ovirt-hosted-engine/vm.conf root@<<hosted_engine_2.example.com>>:/etc/ovirt-hosted-engine/vm.conf

   4. Turn off global maintenance mode:

      # hosted-engine --set-maintenance --mode=none

   5. The HostedEngine virtual machine may need to be shutdown and restarted for this to take effect:
      
      # hosted-engine --vm-shutdown
      # hosted-engine --vm-start

    At this stage you should have the original HostedEngine virtual machine in a down state, 
    and the NewHostedEngine virtual machine ('external-NewHostedEngine') in an Up state. 
    The NewHostedEngine virtual machine ('external-NewHostedEngine') can be migrated between hosts using the Manager.

   6. To remove the old HostedEngine virtual machine, connect HostedEngine virtual machine.

      # ssh root@hosted-engine-virtual machine.example.com

   7. Run this command, replace 'HostedEngine' with the correct name, if different.

      # /usr/share/ovirt-engine/dbscripts/engine-psql.sh -c "select deletevm(vm_guid) from vm_static where vm_name like 'HostedEngine'"

Old HostedEngine virtual machine will disappear from the Administration Portal.

• Rename the NewHostedEngine virtual machine to original name.

    1. Place the HostedEngine environment into global maintenance mode to disable the high-availability agents: 

        # hosted-engine --set-maintenance --mode=global

    2. Edit the vm.conf file on any one of the hosts in the environment. The default location is /etc/ovirt-hosted-engine/vm.conf

        # vi /etc/ovirt-hosted-engine/vm.conf

    3. Manually copy the updated vm.conf file to all hosts in the HostedEngine environment:

        # scp /etc/ovirt-hosted-engine/vm.conf root@<<hosted_engine_2.example.com>>:/etc/ovirt-hosted-engine/vm.conf

    4. Shut down the HostedEngine virtual machine:

        # hosted-engine --vm-shutdown

    5. Start the HostedEngine virtual machine:

        # hosted-engine --vm-start

    6. Disable maintenance mode to enable the high-availability agents:

        # hosted-engine --set-maintenance --mode=none

    7. Connect to the HostedEngine virtual machine:

        # ssh root@hosted-engine-virtual machine.example.com

    8. Change into the postgres user: 

        #  /usr/share/ovirt-engine/dbscripts/engine-psql.sh -c "update vm_static set vm_name='New_HostedEngine_Name' where vm_name='HostedEngine'"

    9.  On any HostedEngine host, place the HostedEngine environment into global maintenance mode to disable the high-availability agents:

       # hosted-engine --set-maintenance --mode=global

   15. On the HostedEngine virtual machine, restart the ovirt-engine service so that the database changes can be affected in the environment:

       # service ovirt-engine restart

   16. On any HostedEngine host, disable maintenance mode:

       # hosted-engine --set-maintenance --mode=none

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