Re: live migration issues after libvirtd restart

[Sandro Bonazzola <sbonazzo@xxxxxxxxxx>]

Il giorno lun 1 lug 2019 alle ore 13:37 Oleksandr Panchuk <oleksandr.panchuk@xxxxxxxxx> ha scritto:

Hi, All 

There is following issue in latest libvirt-4.5.0-10.el7_6.12 package, which could prevent live VM migrations with web sockets enabled, when libvirtd were restarted prior to migration.

Environment:

# uname -a

Linux inv-cp1-hv3-centos7 3.10.0-957.12.2.el7.x86_64 #1 SMP Tue May 14 21:24:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/redhat-release 

CentOS Linux release 7.6.1810 (Core) 

# rpm -qa | grep libvirt-4

libvirt-4.5.0-10.el7_6.12.x86_64

# rpm -qa | grep qemu-kvm

qemu-kvm-common-ev-2.12.0-18.el7_6.5.1.x86_64

qemu-kvm-ev-2.12.0-18.el7_6.5.1.x86_64

qemu-kvm-tools-ev-2.12.0-18.el7_6.5.1.x86_64

Repro steps:

1. start VM with following screen configuration:

<graphics type="vnc" listen="0.0.0.0" passwd="vnc_password" port="-1" auto-port="yes" websocket="-1"/>

2. check VM XML (migratable):

#virsh dumpxml 1 > | grep vnc

<graphics type="vnc" listen="0.0.0.0" passwd="vnc_password" port="-1" auto-port="yes" websocket="-1"/>

3. restart libvirtd

# systemctl restart libvirtd.service

4. check VM XML config again

#virsh dumpxml 1 > | grep vnc
<graphics type="vnc" listen="0.0.0.0" passwd="vnc_password" port="-1" auto-port="yes" websocket="5700"/>

5. try to migrate this VM to hypervisor with already running VM and you will get following error
error: internal error: Failed to reserve port 5700

It happens when on destination hypervisor there is VM running with web socket port 5700.

This issue was fixed since libvirt-4.6.0 release.
I've retested it with libvirt-4.9.0 and libvirt-5.0.0 from http://mirror.centos.org/centos/7/virt/x86_64/libvirt-latest/ repo. And it actually fixed here.

Interesting to know when newer version of libvirt(at least 4.6.0 of 4.5.0 with fix) will be available in official centos updates repo?

Official centos updates repo are rebuilt from RHEL and latest released version in RHEL is libvirt-4.5.0-23.el7 which will be in CentOS 7.7.1908.

You can give it a run from https://buildlogs.centos.org/c7.1908.00.x86_64/libvirt/20190809003358/4.5.0-23.el7.x86_64/

If it's not working there, you'll need to file a bug on RHEL for being considered for backport or stick to CentOS Virtualization SIG version you are already consuming from libivrt-latest repository.

Thanks a lot,
Oleksandr

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Sandro Bonazzola

MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV

Red Hat EMEA

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