3.3. Configuring a RHEL-Based Self-Hosted Engine

The hosted-engine script is provided to assist with configuring the host hypervisor and Manager virtual machine. The script asks you a series of questions, and configures your environment based on your answers.
Ensure that you have completed the following prerequisites:

Prerequisites

  • You must have a freshly installed Red Hat Enterprise Linux 7 system with the ovirt-hosted-engine-setup package installed.
  • You must have prepared storage for your self-hosted engine environment. At least two storage domains are required:
    • A shared storage domain dedicated to the Manager virtual machine. This domain is created during the self-hosted engine deployment, and must be at least 60 GB.
    • A data storage domain for regular virtual machine data. This domain must be added to the self-hosted engine environment after completing the deployment.
    For more information on preparing storage for your deployment, see the Storage chapter of the Administration Guide.
  • You must have a fully qualified domain name prepared for your Manager and the hypervisor host. Forward and reverse lookup records must both be set in the DNS.
  • You must have prepared either CD-ROM, disk, or PXE installation media for the Manager operating system installation. The recommended method is to select the disk option and use the RHEV-M Virtual Appliance for the Manager installation. Obtain the RHEV-M Virtual Appliance by installing the rhevm-appliance package. To use the CD-ROM option, you must have an ISO file available. The physical CD-ROM drive is not supported.
  • To use the RHEV-M Virtual Appliance for the Manager installation, ensure one directory is at least 60 GB. The hosted-engine script first checks if /var/tmp has enough space to extract the appliance files. If not, you can specificy a different directory.

Procedure 3.3. Configuring a RHEL-based Self-Hosted Engine

  1. Initiating Hosted Engine Deployment

    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.

    Note

    Configuring a bonded and vlan-tagged network interface as the management bridge is currently not supported. To work around this issue, see https://access.redhat.com/solutions/1417783 for more information.
    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]: Yes
    Please indicate a pingable gateway IP address [X.X.X.X]:
  4. Configuring the Virtual Machine

    Note

    If you want to manually install the Manager virtual machine, see Appendix A, Manually Installing the Manager Operating System to complete the self-hosted engine setup. Using the appliance eases the workflow, because user interaction with the Manager virtual machine is not required. Manual installation allows you to take full control of the installation.
    Select disk for the boot device type, and the script will automatically detect the RHEV-M Appliances available. Specify the memory size.
             Please specify the device to boot the VM from (cdrom, disk, pxe) [disk]: 
    [ INFO ] Detecting available oVirt engine appliances
             The following appliance have been found on your system:
                   [1] - The oVirt Engine Appliance image (OVA)
                   [2] - Directly select an OVA file
             Please select an appliance (1, 2) [1]:
    [ INFO ] Checking OVF archive content (could take a few minutes depending on archive size)
    	       Please specify the memory size of the appliance in MB (Defaults to OVF value: 16384):
    Specify Yes if you want cloud-init to take care of the initial configuration of the Manager virtual machine. Specify Generate for cloud-init to take care of tasks like setting the root password, configuring networking, configuring the host name, injecting an answers file for engine-setup to use, and running engine-setup on boot. Optionally, select Existing if you have an existing cloud-init script to take care of more sophisticated functions of cloud-init. Specify the FQDN for the Manager virtual machine. Specify a MAC address for the HostedEngine-VM, or accept a randomly generated one. The MAC address can be used to update your DHCP and DNS server prior to installing the operating system on the virtual machine.

    Note

    For more information on cloud-init, see https://cloudinit.readthedocs.org/en/latest/.
    Would you like to use cloud-init to customize the appliance on the first boot (Yes, No)[Yes]? Yes
    Would you like to generate on-fly a cloud-init no-cloud ISO image or do you have an existing one(Generate, Existing)[Generate]? Generate
    Please provide the FQDN you would like to use for the engine appliance.
    Note: This will be the FQDN of the engine VM you are now going to launch.
    It should not point to the base host or to any other existing machine.
    Engine VM FQDN: (leave it empty to skip): manager.example.com
    Automatically execute engine-setup on the engine appliance on first boot (Yes, No)[Yes]? Yes
    Automatically restart the engine VM as a monitored service after engine-setup (Yes, No)[Yes]? Yes
    Please provide the domain name you would like to use for the engine appliance.
    Engine VM domain: [example.com]
    Enter root password that will be used for the engine appliance (leave it empty to skip): p@ssw0rd
    Confirm appliance root password: p@ssw0rd
    How should the engine VM network be configured (DHCP, Static)[DHCP]? Static
    Please enter the IP address to be used for the engine VM: 192.168.x.x
    Please provide a comma-separated list (max3) of IP addresses of domain name servers for the engine VM
    Engine VM DNS (leave it empty to skip):
    Add lines for the appliance itself and for this host to /etc/hosts on the engine VM?
    Note: ensuring that this host could resolve the engine VM hostname is still up to you (Yes, No)[No] Yes
    Please specify an alias for the Hosted Engine image [hosted_engine]:
    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 appliance OVF value: 4]: 
    You may specify a MAC address for the VM or accept a randomly generated default [00:16:3e:77:b2:a4]: 
    Please specify the console type you would like to use to connect to the VM (vnc, spice) [vnc]: vnc
  5. Configuring the Hosted Engine

    Specify a name for hypervisor host to be identified in the Administration Portal, and the password for the admin@internal user to access the Administration Portal. 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.
    Enter the name which will be used to identify this host inside the Administrator Portal [hosted_engine_1]:
    Enter 'admin@internal' user password that will be used for accessing the Administrator Portal: p@ssw0rd
    Confirm 'admin@internal' user password: p@ssw0rd
    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.
  7. Creating the Manager Virtual Machine

    The script creates the Manager virtual machine, starts the ovirt-engine and high availability services, and connects the hypervisor host and shared storage domain to the Manager virtual machine.
    You can now connect to the VM with the following command:
    	/usr/bin/remote-viewer vnc://localhost:5900
    Use temporary password "3042QHpX" 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 serial console using the following command:
    socat UNIX-CONNECT:/var/run/ovirt-vmconsole-console/fabbea5a-1989-411f-8ed7-7abe0917fc66.sock,user=ovirt-vmconsole STDIO,raw,echo=0,escape=1
    
    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
    [ INFO ] Running engine-setup on the appliance
    ...
    [ INFO ] Engine-setup successfully completed
    [ INFO ] Engine is still unreachable
    [ INFO ] Engine is still unreachable, waiting...
    [ INFO ] Engine replied: DB Up!Welcome to Health Status!
    [ INFO ] Connecting to the Engine
             Enter the name of the cluster to which you want to add the host (Default) [Default]:
    [ 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      
    [ INFO  ] Shutting down the engine VM
    [ INFO  ] Enabling and starting HA services
    [ INFO  ] Saving hosted-engine configuration on the shared storage domain
              Hosted Engine successfully set up
    [ INFO  ] Stage: Clean up
    [ INFO  ] Generating answer file '/var/lib/ovirt-hosted-engine-setup/answers/answers-2015xx.conf'
    [ INFO  ] Generating answer file '/etc/ovirt-hosted-engine/answers.conf'
    [ INFO  ] Stage: Pre-termination
    [ INFO  ] Stage: Termination
When the hosted-engine deployment script completes successfully, the Red Hat Enterprise Virtualization Manager is configured and running on your hypervisor host. The Manager has already configured the data center, cluster, hypervisor host, the Manager virtual machine, and a shared storage domain dedicated to the Manager virtual machine.

Important

Log in as the admin@internal user to continue configuring the Manager and add further resources. You must create another data domain for the data center to be initialized to host regular virtual machine data, and for the Manager virtual machine to be visible. See Storage in the Administration Guide for different storage options and on how to add a data storage domain.
Link your Red Hat Enterprise Virtualization Manager to a directory server so you can add additional users to the environment. Red Hat Enterprise Virtualization supports many directory server types; for example, Red Hat Directory Server (RHDS), Red Hat Identity Management (IdM), Active Directory, and many other types. Add a directory server to your environment using the ovirt-engine-extension-aaa-ldap-setup interactive setup script. For more information, see Configuring an External LDAP Provider in the Administration Guide.
The ovirt-hosted-engine-setup script also saves the answers you gave during configuration to a file, to help with disaster recovery. If a destination is not specified using the --generate-answer=<file> argument, the answer file is generated at /etc/ovirt-hosted-engine/answers.conf.

Note

SSH password authentication is not enabled by default on the RHEV-M Virtual Appliance. You can enable SSH password authentication by accessing the Red Hat Enterprise Virtualization Manager virtual machine through the SPICE or VNC console. Verify that the sshd service is running. Edit /etc/ssh/sshd_config and change the following two options to yes:
  • PasswordAuthentication
  • PermitRootLogin
Restart the sshd service for the changes to take effect.