Migration fails

This article contents known reasons of migration failures.

Reason #1

Symptomps

After giving vzmigrate -v --online <ip address> <veid> the following message appears:

Error: undump failed: Invalid argumentStopping VE ...
Restoring failed:
iptables-restore exited with 1
rst_restore_net: -22

Reason

The VE which you wish to migrate uses some iptables modules, that are not loaded on destination node. Consequently iptables-restore fails.

Workaround

Load all iptables kernel modules that are used by VE on destination node.

Links

• http://bugzilla.openvz.org/show_bug.cgi?id=631
• http://forum.openvz.org/index.php?t=tree&th=2756&mid=14198&&rev=&reveal=

Reason #2

Symptomps

The system runs 028stab031 or older kernels and after giving vzmigrate -v --online <ip address> <veid> the following message appears:

Live migrating VE
    Suspending VE
Setting up checkpoint...
        suspend...
Can not suspend VE: Device or resource busy
file on unsupported FS: magic 0bad1dea
Checkpointing failed
Error:  Failed to suspend VE

Reason

The VE which you wish to migrate uses inotify mechanism (magic 0bad1dea), that is not supported by 028stab031 and older kernels.

Workaround

Update till 028stab035 or newer kernel.

Links

• http://bugzilla.openvz.org/show_bug.cgi?id=552
• http://forum.openvz.org/index.php?t=tree&goto=14780&#msg_14780

Reason #3

Symptomps

After giving vzmigrate -v --online <ip address> <veid> the following message appears:

Dumping VE
Setting up checkpoint...
        join context..
        dump...
Can not dump VE: Device or resource busy
unsupported netdevice tun0
Checkpointing failed
Error:  Failed to dump VE

Reason

Checkpointing doesn't support tun device inside VE, which is usually used for VPN via the TUN/TAP device in VE.

Workaround

You should not use tun device in VE to migrate it.

Links

• http://bugzilla.openvz.org/show_bug.cgi?id=642
• http://forum.openvz.org/index.php?t=tree&goto=14826&#msg_14826