[ClusterLabs] Antw: [EXT] Q: Prevent non-live VM migration

[Ulrich Windl]

>>> "Ulrich Windl" <Ulrich.Windl at rz.uni-regensburg.de> schrieb am 12.07.2021
um
08:35 in Nachricht <60EBE2AD020000A1000424E4 at gwsmtp.uni-regensburg.de>:
> Hi!
> 
> We had some problem in the cluster that prevented live migration of VMs. As

> a consequence the cluster migrated the VMs using stop/start.

As a side-note: It was found that Update libvirt-daemon-6.0.0-13.13.1.x86_64
of SLES15 SP2 seems to overwrite the configuration file
/etc/sysconfig/libvirtd, causing the LIBVIRTD_ARGS="--listen" to be dropped.
Running libvirtd without the "--listen" parameter seemed to cause the migration
failures.

Kind of proof:
 # ll /etc/sysconfig/libvirtd
-rw-r--r-- 1 root root 642 Jun  8 08:20 /etc/sysconfig/libvirtd
# rpm -qi libvirt-daemon
Name        : libvirt-daemon
Version     : 6.0.0
Release     : 13.13.1
Architecture: x86_64
Install Date: Tue Jun  8 08:20:30 2021
...

Regards,
Ulrich


> I wonder: Is there a way to prevent stop/start migration if live‑migration 
> failed?
> In out case the migration was triggeerd by resource placement strategy.
> 
> The messages logged would look like this:
>  warning: Unexpected result (error: v15: live migration to h18 failed: 1) 
> was recorded for migrate_to of prm_xen_v15 on h16
> 
> Regards,
> Ulrich
> 
> 
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