Chapter 5. Migrating from Bare Metal to a RHEL-Based Self-Hosted Environment

5.1. Migrating to a Self-Hosted Environment

To migrate an existing instance of a standard Red Hat Enterprise Virtualization to a self-hosted engine environment, use the hosted-engine script to assist with the task. The script asks you a series of questions, and configures your environment based on your answers. The Manager from the standard Red Hat Enterprise Virtualization environment is referred to as the BareMetal-Manager in the following procedure.
The migration involves the following key actions:
  • Run the hosted-engine script to configure the host to be used as a self-hosted engine host and to create a new Red Hat Enterprise Virtualization virtual machine.
  • Back up the the engine database and configuration files using the engine-backup tool, copy the backup to the new Manager virtual machine, and restore the backup using the --mode=restore parameter of engine-backup. Run engine-setup to complete the Manager virtual machine configuration.
  • Follow the hosted-engine script to complete the setup.
In the following procedure, the Manager operating system is installed manually. Optionally, use the RHEV-M Virtual Appliance to ease that part of the process. See Section 5.2, “Migrating to a Self-Hosted Environment using the RHEV-M Virtual Appliance” for more information.

Prerequisites

  • Prepare a new hypervisor host with the ovirt-hosted-engine-setup package installed. See Chapter 3, Deploying Self-Hosted Engine on a Red Hat Enterprise Linux Host for more information on subscriptions and package installation. The host must be a supported version of the current Red Hat Enterprise Virtualization environment.

    Note

    If you intend to use an existing host, place the host in maintenance and remove it from the existing environment. See Removing a Host in the Administration Guide for more information.
  • Prepare storage for your self-hosted engine environment. The self-hosted engine requires a shared storage domain dedicated to the Manager virtual machine. This domain is created during deployment, and must be at least 60 GB. For more information on preparing storage for your deployment, see the Storage chapter of the Administration Guide.
  • Prepare an installation media of the same version of the operating system used for the BareMetal-Manager.
  • The fully qualified domain name of the new Manager must be the same fully qualified domain name as that of the BareMetal-Manager. Forward and reverse lookup records must both be set in DNS.
  • You must have access and can make changes to the BareMetal-Manager.

Procedure 5.1. Migrating to a Self-Hosted Environment

  1. Initiating a Self-Hosted Engine Deployment

    Note

    If your original installation was version 3.5 or earlier, and the current name of the management network is rhevm, you must modify the answer file prior to running hosted-engine --deploy. For more information, see https://access.redhat.com/solutions/2292861.
    Run the hosted-engine script. To escape the script at any time, use the CTRL+D keyboard combination to abort deployment. It is recommended to use the screen window manager to run the script to avoid losing the session in case of network or terminal disruption. If not already installed, install the screen package, which is available in the standard Red Hat Enterprise Linux repository.
    # yum install screen
    # screen
    # hosted-engine --deploy

    Note

    In the event of session timeout or connection disruption, run screen -d -r to recover the hosted-engine deployment session.
  2. Configuring Storage

    Select the type of storage to use.
    During customization use CTRL-D to abort.
    Please specify the storage you would like to use (glusterfs, iscsi, fc, nfs3, nfs4)[nfs3]:
    • For NFS storage types, specify the full address, using either the FQDN or IP address, and path name of the shared storage domain.
      Please specify the full shared storage connection path to use (example: host:/path): storage.example.com:/hosted_engine/nfs
    • For iSCSI, specify the iSCSI portal IP address, port, user name and password, and select a target name from the auto-detected list. You can only select one iSCSI target during the deployment.
      Please specify the iSCSI portal IP address:           
      Please specify the iSCSI portal port [3260]:           
      Please specify the iSCSI portal user:           
      Please specify the iSCSI portal password:
      Please specify the target name (auto-detected values) [default]:
    • For Gluster storage, specify the full address, using either the FQDN or IP address, and path name of the shared storage domain.

      Important

      Only replica 3 Gluster storage is supported. Ensure the following configuration has been made:
      • In the /etc/glusterfs/glusterd.vol file on all three Gluster servers, set rpc-auth-allow-insecure to on.
        option rpc-auth-allow-insecure on
      • Configure the volume as follows:
        gluster volume set volume cluster.quorum-type auto
        gluster volume set volume network.ping-timeout 10
        gluster volume set volume auth.allow \*
        gluster volume set volume group virt
        gluster volume set volume storage.owner-uid 36
        gluster volume set volume storage.owner-gid 36
        gluster volume set volume server.allow-insecure on
      Please specify the full shared storage connection path to use (example: host:/path): storage.example.com:/hosted_engine/gluster_volume
    • For Fibre Channel, the host bus adapters must be configured and connected, and the hosted-engine script will auto-detect the LUNs available. The LUNs must not contain any existing data.
      The following luns have been found on the requested target:
      [1]     3514f0c5447600351       30GiB   XtremIO XtremApp
                              status: used, paths: 2 active
                
      [2]     3514f0c5447600352       30GiB   XtremIO XtremApp
                              status: used, paths: 2 active
      
      Please select the destination LUN (1, 2) [1]:
    Choose the storage domain and storage data center names to be used in the environment.
    [ INFO  ] Installing on first host
    Please provide storage domain name. [hosted_storage]: 
    Local storage datacenter name is an internal name and currently will not be shown in engine's admin UI.Please enter local datacenter name [hosted_datacenter]:
  3. Configuring the Network

    The script detects possible network interface controllers (NICs) to use as a management bridge for the environment. It then checks your firewall configuration and offers to modify it for console (SPICE or VNC) access HostedEngine-VM. Provide a pingable gateway IP address, to be used by the ovirt-ha-agent to help determine a host's suitability for running HostedEngine-VM.
    Please indicate a nic to set rhevm bridge on: (eth1, eth0) [eth1]:
    iptables was detected on your computer, do you wish setup to configure it? (Yes, No)[Yes]: 
    Please indicate a pingable gateway IP address [X.X.X.X]:
  4. Configuring the Virtual Machine

    The script creates a virtual machine to be configured as the Red Hat Enterprise Virtualization Manager, referred to in this procedure as HostedEngine-VM. Specify the boot device and, if applicable, the path name of the installation media, the CPU type, the number of virtual CPUs, and the disk size. Specify a MAC address for the HostedEngine-VM, or accept a randomly generated one. The MAC address can be used to update your DHCP server prior to installing the operating system on the virtual machine. Specify memory size and console connection type for the creation of HostedEngine-VM.
    Please specify the device to boot the VM from (cdrom, disk, pxe) [cdrom]: 
    The following CPU types are supported by this host:
              - model_Penryn: Intel Penryn Family
              - model_Conroe: Intel Conroe Family
    Please specify the CPU type to be used by the VM [model_Penryn]: 
    Please specify the number of virtual CPUs for the VM [Defaults to minimum requirement: 2]: 
    Please specify the disk size of the VM in GB [Defaults to minimum requirement: 25]: 
    You may specify a MAC address for the VM or accept a randomly generated default [00:16:3e:77:b2:a4]: 
    Please specify the memory size of the VM in MB [Defaults to minimum requirement: 4096]: 
    Please specify the console type you want to use to connect to the VM (vnc, spice) [vnc]:
  5. Configuring the Self-Hosted Engine

    Specify the name for Host-HE1 to be identified in the Red Hat Enterprise Virtualization environment, and the password for the admin@internal user to access the Administration Portal. Provide the FQDN for HostedEngine-VM; this procedure uses the FQDN manager.example.com. Finally, provide the name and TCP port number of the SMTP server, the email address used to send email notifications, and a comma-separated list of email addresses to receive these notifications.

    Important

    The FQDN provided for the engine must be the same FQDN provided for the BareMetal-Manager.
    Enter the name which will be used to identify this host inside the Administrator Portal [hosted_engine_1]: Host-HE1
    Enter 'admin@internal' user password that will be used for accessing the Administrator Portal: 
    Confirm 'admin@internal' user password: 
    Please provide the FQDN for the engine you want to use. This needs to match the FQDN that you will use for the engine installation within the VM: manager.example.com
    Please provide the name of the SMTP server through which we will send notifications [localhost]: 
    Please provide the TCP port number of the SMTP server [25]: 
    Please provide the email address from which notifications will be sent [root@localhost]: 
    Please provide a comma-separated list of email addresses which will get notifications [root@localhost]:
  6. Configuration Preview

    Before proceeding, the hosted-engine script displays the configuration values you have entered, and prompts for confirmation to proceed with these values.
    Bridge interface                   : eth1
    Engine FQDN                        : manager.example.com
    Bridge name                        : rhevm
    SSH daemon port                    : 22
    Firewall manager                   : iptables
    Gateway address                    : X.X.X.X
    Host name for web application      : Host-HE1
    Host ID                            : 1
    Image size GB                      : 25
    Storage connection                 : storage.example.com:/hosted_engine/nfs
    Console type                       : vnc
    Memory size MB                     : 4096
    MAC address                        : 00:16:3e:77:b2:a4
    Boot type                          : pxe
    Number of CPUs                     : 2
    CPU Type                           : model_Penryn
    
    Please confirm installation settings (Yes, No)[No]:
  7. Creating HostedEngine-VM

    The script creates the virtual machine to be configured as HostedEngine-VM and provides connection details. You must install an operating system on HostedEngine-VM before the hosted-engine script can proceed on Host-HE1.
    [ INFO  ] Stage: Transaction setup
    ...
    [ INFO  ] Creating VM
    You can now connect to the VM with the following command:
    	/usr/bin/remote-viewer vnc://localhost:5900
    Use temporary password "5379skAb" to connect to vnc console.
    Please note that in order to use remote-viewer you need to be able to run graphical applications.
    This means that if you are using ssh you have to supply the -Y flag (enables trusted X11 forwarding).
    Otherwise you can run the command from a terminal in your preferred desktop environment.
    If you cannot run graphical applications you can connect to the graphic console from another host or connect to the console using the following command:
    virsh -c qemu+tls://Test/system console HostedEngine
    If you need to reboot the VM you will need to start it manually using the command:
    hosted-engine --vm-start
    You can then set a temporary password using the command:
    hosted-engine --add-console-password
    The VM has been started.  Install the OS and shut down or reboot it.  To continue please make a selection:
             
              (1) Continue setup - VM installation is complete
              (2) Reboot the VM and restart installation
              (3) Abort setup
              (4) Destroy VM and abort setup
             
              (1, 2, 3, 4)[1]:
    Connect to the virtual machine using the VNC protocol with the following command. Replace FQDN wit the fully qualified domain name or the IP address of the self-hosted engine host.
    /usr/bin/remote-viewer vnc://FQDN:5900
  8. Installing the Virtual Machine Operating System

    Connect to HostedEngine-VM, the virtual machine created by the hosted-engine script, and install a Red Hat Enterprise Linux 6.7 operating system.
  9. Synchronizing the Host and the Virtual Machine

    Return to Host-HE1 and continue the hosted-engine deployment script by selecting option 1:
    (1) Continue setup - VM installation is complete
  10. Installing the Manager

    Connect to HostedEngine-VM, and subscribe to the appropriate Red Hat Enterprise Virtualization Manager repositories. See Subscribing to the Required Entitlements in the Installation Guide.
    Ensure that the most up-to-date versions of all installed packages are in use, and install the rhevm packages.
    # yum update
    # yum install rhevm
  11. Disabling BareMetal-Manager

    Connect to BareMetal-Manager, the Manager of your established Red Hat Enterprise Virtualization environment, and stop the engine and prevent it from running.
    # service ovirt-engine stop
    # chkconfig ovirt-engine off

    Note

    Though stopping BareMetal-Manager from running is not obligatory, it is recommended as it ensures no changes will be made to the environment after the backup has been created. Additionally, it prevents BareMetal-Manager and HostedEngine-VM from simultaneously managing existing resources.
  12. Updating DNS

    Update your DNS so that the FQDN of the Red Hat Enterprise Virtualization environment correlates to the IP address of HostedEngine-VM and the FQDN previously provided when configuring the hosted-engine deployment script on Host-HE1. In this procedure, FQDN was set as manager.example.com because in a migrated hosted-engine setup, the FQDN provided for the engine must be identical to that given in the engine setup of the original engine.
  13. Creating a Backup of BareMetal-Manager

    1. Ensure that the management network (ovirtmgmt)is configured as a VM network prior to performing the backup. For more information on configuring networks, see Explanation of Settings and Controls in the New Logical Network and Edit Logical Network Windows in the Administration Guide.
    2. Connect to BareMetal-Manager and run the engine-backup command with the --mode=backup, --file=FILE, and --log=LogFILE parameters to specify the backup mode, the name of the backup file created and used for the backup, and the name of the log file to be created to store the backup log.
      # engine-backup --mode=backup --file=FILE --log=LogFILE
  14. Copying the Backup File to HostedEngine-VM

    On BareMetal-Manager, secure copy the backup file to HostedEngine-VM. In the following example, [manager.example.com] is the FQDN for HostedEngine-VM, and /backup/ is any designated folder or path. If the designated folder or path does not exist, you must connect to HostedEngine-VM and create it before secure copying the backup from BareMetal-Manager.
    # scp -p FILE LogFILE manager.example.com:/backup/
  15. Restoring the Backup File on HostedEngine-VM

    Use the engine-backup tool to restore a complete backup. If you configured the BareMetal-Manager database(s) manually during engine-setup, follow the instructions at Section 7.2.3, “Restoring the Self-Hosted Engine Manager Manually” to restore the backup environment manually.
    • If you are only restoring the Manager, run:
      # engine-backup --mode=restore --file=file_name --log=log_file_name --provision-db --restore-permissions
    • If you are restoring the Manager, Reports, and Data Warehouse, run:
      # engine-backup --mode=restore --file=file_name --log=log_file_name --provision-db --provision-dwh-db --provision-reports-db --restore-permissions
    If successful, the following output displays:
    You should now run engine-setup.
    Done.
  16. Configuring HostedEngine-VM

    Configure the restored Manager virtual machine. This process identifies the existing configuration settings and database content. Confirm the settings. Upon completion, the setup provides an SSH fingerprint and an internal Certificate Authority hash.
    # engine-setup
    [ INFO  ] Stage: Initializing
    [ INFO  ] Stage: Environment setup
    Configuration files: ['/etc/ovirt-engine-setup.conf.d/10-packaging.conf', '/etc/ovirt-engine-setup.conf.d/20-setup-ovirt-post.conf']
    Log file: /var/log/ovirt-engine/setup/ovirt-engine-setup-20140304075238.log
    Version: otopi-1.1.2 (otopi-1.1.2-1.el6ev)
    [ INFO  ] Stage: Environment packages setup
    [ INFO  ] Yum Downloading: rhel-65-zstream/primary_db 2.8 M(70%)
    [ INFO  ] Stage: Programs detection
    [ INFO  ] Stage: Environment setup
    [ INFO  ] Stage: Environment customization
             
              --== PACKAGES ==--
             
    [ INFO  ] Checking for product updates...
    [ INFO  ] No product updates found
             
              --== NETWORK CONFIGURATION ==--
             
    Setup can automatically configure the firewall on this system.
    Note: automatic configuration of the firewall may overwrite current settings.
    Do you want Setup to configure the firewall? (Yes, No) [Yes]: 
    [ INFO  ] iptables will be configured as firewall manager.
             
              --== DATABASE CONFIGURATION ==--
             
             
              --== OVIRT ENGINE CONFIGURATION ==--
             
             
              --== PKI CONFIGURATION ==--
             
             
              --== APACHE CONFIGURATION ==--
             
             
              --== SYSTEM CONFIGURATION ==--
             
             
              --== END OF CONFIGURATION ==--
             
    [ INFO  ] Stage: Setup validation
    [ INFO  ] Cleaning stale zombie tasks
             
              --== CONFIGURATION PREVIEW ==--
             
              Default SAN wipe after delete           : False
              Firewall manager                        : iptables
              Update Firewall                         : True
              Host FQDN                               : manager.example.com
              Engine database secured connection      : False
              Engine database host                    : X.X.X.X
              Engine database user name               : engine
              Engine database name                    : engine
              Engine database port                    : 5432
              Engine database host name validation    : False
              Engine installation                     : True
              PKI organization                        : example.com
              NFS mount point                         : /var/lib/exports/iso
              Configure VMConsole Proxy               : True
              Engine Host FQDN                        : manager.example.com
              Configure WebSocket Proxy               : True
             
              Please confirm installation settings (OK, Cancel) [OK]:
  17. Synchronizing the Host and the Manager

    Return to Host-HE1 and continue the hosted-engine deployment script by selecting option 1:
    (1) Continue setup - engine installation is complete
    [ INFO  ] Engine replied: DB Up!Welcome to Health Status!
    [ INFO  ] Waiting for the host to become operational in the engine. This may take several minutes...
    [ INFO  ] Still waiting for VDSM host to become operational...
    [ INFO  ] The VDSM Host is now operational
              Please shutdown the VM allowing the system to launch it as a monitored service.
              The system will wait until the VM is down.
  18. Shutting Down HostedEngine-VM

    Shutdown HostedEngine-VM.
    # shutdown -h now
  19. Setup Confirmation

    Return to Host-HE1 to confirm it has detected that HostedEngine-VM is down.
    [ INFO  ] Enabling and starting HA services
              Hosted Engine successfully set up
    [ INFO  ] Stage: Clean up
    [ INFO  ] Stage: Pre-termination
    [ INFO  ] Stage: Termination
Your Red Hat Enterprise Virtualization engine has been migrated to a hosted-engine setup. The Manager is now operating on a virtual machine on Host-HE1, called HostedEngine-VM in the environment. As HostedEngine-VM is highly available, it is migrated to other hosts in the environment when applicable.