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Appendix A. Troubleshooting a Self-hosted Engine Deployment

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To confirm whether the self-hosted engine has already been deployed, run hosted-engine --check-deployed. An error will only be displayed if the self-hosted engine has not been deployed.

A.1. Troubleshooting the Manager Virtual Machine

Check the status of the Manager virtual machine by running hosted-engine --vm-status.

Note

Any changes made to the Manager virtual machine will take about 20 seconds before they are reflected in the status command output.

Depending on the Engine status in the output, see the following suggestions to find or fix the issue.

Engine status: "health": "good", "vm": "up" "detail": "up"

  1. If the Manager virtual machine is up and running as normal, you will see the following output: 

    --== Host 1 status ==--

Status up-to-date              : True
Hostname                       : hypervisor.example.com
Host ID                        : 1
Engine status                  : {"health": "good", "vm": "up", "detail": "up"}
Score                          : 3400
stopped                        : False
Local maintenance              : False
crc32                          : 99e57eba
Host timestamp                 : 248542
  2. If the output is normal but you cannot connect to the Manager, check the network connection.

Engine status: "reason": "failed liveliness check", "health": "bad", "vm": "up", "detail": "up"

  1. If the health is bad and the vm is up, the HA services will try to restart the Manager virtual machine to get the Manager back. If it does not succeed within a few minutes, enable the global maintenance mode from the command line so that the hosts are no longer managed by the HA services. 

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

  2. Connect to the console. When prompted, enter the operating system’s root password. For more console options, see How to access Hosted Engine VM console from RHEV-H host?. 

    # hosted-engine --console
  3. Ensure that the Manager virtual machine’s operating system is running by logging in.

  4. Check the status of the ovirt-engine service: 

    # systemctl status -l ovirt-engine
# journalctl -u ovirt-engine
  5. Check the following logs: /var/log/messages, /var/log/ovirt-engine/engine.log, and /var/log/ovirt-engine/server.log.

  6. After fixing the issue, reboot the Manager virtual machine manually from one of the self-hosted engine nodes: 

    # hosted-engine --vm-shutdown
# hosted-engine --vm-start
    Note

    When the self-hosted engine nodes are in global maintenance mode, the Manager virtual machine must be rebooted manually. If you try to reboot the Manager virtual machine by sending a reboot command from the command line, the Manager virtual machine will remain powered off. This is by design.

  7. On the Manager virtual machine, verify that the ovirt-engine service is up and running: 

     # systemctl status ovirt-engine.service

  8. After ensuring the Manager virtual machine is up and running, close the console session and disable the maintenance mode to enable the HA services again: 

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

Engine status: "vm": "down", "health": "bad", "detail": "unknown", "reason": "vm not running on this host"

Note

This message is expected on a host that is not currently running the Manager virtual machine.

  1. If you have more than one host in your environment, ensure that another host is not currently trying to restart the Manager virtual machine.
  2. Ensure that you are not in global maintenance mode.
  3. Check the ovirt-ha-agent logs in /var/log/ovirt-hosted-engine-ha/agent.log.

  4. Try to reboot the Manager virtual machine manually from one of the self-hosted engine nodes: 

    # hosted-engine --vm-shutdown
# hosted-engine --vm-start

Engine status: "vm": "unknown", "health": "unknown", "detail": "unknown", "reason": "failed to getVmStats"

This status means that ovirt-ha-agent failed to get the virtual machine’s details from VDSM.

  1. Check the VDSM logs in /var/log/vdsm/vdsm.log.
  2. Check the ovirt-ha-agent logs in /var/log/ovirt-hosted-engine-ha/agent.log.

Engine status: The self-hosted engine’s configuration has not been retrieved from shared storage

If you receive the status The hosted engine configuration has not been retrieved from shared storage. Please ensure that ovirt-ha-agent is running and the storage server is reachable there is an issue with the ovirt-ha-agent service, or with the storage, or both.

  1. Check the status of ovirt-ha-agent on the host: 

    # systemctl status -l ovirt-ha-agent
# journalctl -u ovirt-ha-agent

  2. If the ovirt-ha-agent is down, restart it: 

    # systemctl start ovirt-ha-agent
  3. Check the ovirt-ha-agent logs in /var/log/ovirt-hosted-engine-ha/agent.log.
  4. Check that you can ping the shared storage.
  5. Check whether the shared storage is mounted.

Additional Troubleshooting Commands

Important

Contact the Red Hat Support Team if you feel you need to run any of these commands to troubleshoot your self-hosted engine environment.

  • hosted-engine --reinitialize-lockspace: This command is used when the sanlock lockspace is broken. Ensure that the global maintenance mode is enabled and that the Manager virtual machine is stopped before reinitializing the sanlock lockspaces.
  • hosted-engine --clean-metadata: Remove the metadata for a host’s agent from the global status database. This makes all other hosts forget about this host. Ensure that the target host is down and that the global maintenance mode is enabled.
  • hosted-engine --check-liveliness: This command checks the liveliness page of the ovirt-engine service. You can also check by connecting to https://engine-fqdn/ovirt-engine/services/health/ in a web browser.
  • hosted-engine --connect-storage: This command instructs VDSM to prepare all storage connections needed for the host and the Manager virtual machine. This is normally run in the back-end during the self-hosted engine deployment. Ensure that the global maintenance mode is enabled if you need to run this command to troubleshoot storage issues.

A.2. Cleaning Up a Failed Self-hosted Engine Deployment

If a self-hosted engine deployment was interrupted, subsequent deployments will fail with an error message. The error will differ depending on the stage in which the deployment failed.

If you receive an error message, you can run the cleanup script on the deployment host to clean up the failed deployment. However, it’s best to reinstall your base operating system and start the deployment from the beginning.

Note

The cleanup script has the following limitations:

  • A disruption in the network connection while the script is running might cause the script to fail to remove the management bridge or to recreate a working network configuration.
  • The script is not designed to clean up any shared storage device used during a failed deployment. You need to clean the shared storage device before you can reuse it in a subsequent deployment.

Procedure

  1. Run /usr/sbin/ovirt-hosted-engine-cleanup and select y to remove anything left over from the failed self-hosted engine deployment. 

    # /usr/sbin/ovirt-hosted-engine-cleanup
This will de-configure the host to run ovirt-hosted-engine-setup from scratch.
Caution, this operation should be used with care.
Are you sure you want to proceed? [y/n]

  2. Define whether to reinstall on the same shared storage device or select a different shared storage device.

    • To deploy the installation on the same storage domain, clean up the storage domain by running the following command in the appropriate directory on the server for NFS, Gluster, PosixFS or local storage domains: 

      # rm -rf storage_location/*
    • For iSCSI or Fibre Channel Protocol (FCP) storage, see How to Clean Up a Failed Self-hosted Engine Deployment? for information on how to clean up the storage.

    • Reboot the self-hosted engine host or select a different shared storage device.

      Note

      The reboot is needed to make sure all the connections to the storage are cleaned before the next attempt.

  3. Redeploy the self-hosted engine.
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