OLVM: How to Recover a Host Taken Over By Another Engine (Doc ID 2540907.1)

Last updated on FEBRUARY 05, 2024

Applies to:

Goal

The oVirt engine does not place locks on a host to prevent it from being added as a "New" host by another engine.

Should this occur, the original "owning" engine will exhibit symptoms including:

• the host status will be "Connecting" or "NonResponsive"
• any running VM's can no longer be controlled by the first engine.
  • the status of the VM's will be "unknown"
• Attempts to manipulate the host - e.g. place into maintenance mode - will fail.
• Attempts to manipulate the VM's will fail.

The host's vdsm service will show SSL errors, e.g.

[root@host ~]# systemctl status vdsmd
● vdsmd.service - Virtual Desktop Server Manager
Loaded: loaded (/usr/lib/systemd/system/vdsmd.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2019-05-13 14:21:29 IST; 1h 56min ago
Main PID: 30717 (vdsmd)
Tasks: 39
CGroup: /system.slice/vdsmd.service
└─30717 /usr/bin/python2 /usr/share/vdsm/vdsmd

May 13 16:14:44 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:15:07 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:15:30 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:15:53 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:16:16 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:16:39 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:17:03 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:17:26 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:17:49 host vdsm[30717]: ERROR ssl handshake: SS...
May 13 16:18:12 host vdsm[30717]: ERROR ssl handshake: SS...
Hint: Some lines were ellipsized, use -l to show in full.

The second engine will inherit definitions from the first engine, but not resources, and will list the VM's that were running on the host (if any).

Note: the issue is not limited to Oracle Linux Virtualization Manager - the same can occur with the open-source oVirt product.

Solution

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