3.3. Configuring a RHEL-Based Self-Hosted Engine
hosted-enginescript 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.
- 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:For more information on preparing storage for your deployment, see the Storage chapter of the Administration Guide.
- 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.
- 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-enginescript first checks if
/var/tmphas 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
Initiating Hosted Engine DeploymentRun the
hosted-enginescript. To escape the script at any time, use the CTRL+D keyboard combination to abort deployment. It is recommended to use the
screenwindow 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
# hosted-engine --deploy
NoteIn the event of session timeout or connection disruption, run
screen -d -rto recover the
Configuring StorageSelect 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]:
Choose the storage domain and storage data center names to be used in the environment.
- 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 : 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.
ImportantOnly replica 3 Gluster storage is supported. Ensure the following configuration has been made:
- In the
/etc/glusterfs/glusterd.volfile on all three Gluster servers, set
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-enginescript will auto-detect the LUNs available. The LUNs must not contain any existing data.
The following luns have been found on the requested target:  3514f0c5447600351 30GiB XtremIO XtremApp status: used, paths: 2 active  3514f0c5447600352 30GiB XtremIO XtremApp status: used, paths: 2 active Please select the destination LUN (1, 2) :
[ 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]:
Configuring the NetworkThe 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.
NoteConfiguring 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]:
Configuring the Virtual Machine
NoteIf 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.Selectfor 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:  - The oVirt Engine Appliance image (OVA)  - Directly select an OVA file Please select an appliance (1, 2) : [ 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
Yesif you want cloud-init to take care of the initial configuration of the Manager virtual machine. Specify 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-setupto use, and running
engine-setupon boot. Optionally, select 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.
NoteFor 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
Configuring the Hosted EngineSpecify a name for hypervisor host to be identified in the Administration Portal, and the password for the
admin@internaluser 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 : 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]:
Configuration PreviewBefore proceeding, the
hosted-enginescript displays the configuration values you have entered, and prompts for confirmation to proceed with these values.
Creating the Manager Virtual MachineThe script creates the Manager virtual machine, starts the
ovirt-engineand 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
hosted-enginedeployment 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.
ovirt-engine-extension-aaa-ldap-setupinteractive setup script. For more information, see Configuring an External LDAP Provider in the Administration Guide.
ovirt-hosted-engine-setupscript 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
sshdservice is running. Edit
/etc/ssh/sshd_configand change the following two options to
sshdservice for the changes to take effect.