This article describes known reasons of migration failures, and solutions for those.
Contents
Problem #1
Symptoms
After giving vzmigrate -v --online <ip address> <veid> the following message appears:
Error: undump failed: Invalid argument Stopping container ... Restoring failed: iptables-restore exited with 1 rst_restore_net: -22
Reason
The container which you wish to migrate uses some iptables modules, that are not loaded on destination node. Consequently iptables-restore fails.
Solution
Load all iptables kernel modules that are used by container on destination node.
Links
Problem #2
Symptoms
The system runs 028stab031 or older kernels and after giving vzmigrate -v --online <ip address> <veid> the following message appears:
Live migrating container
Suspending container
Setting up checkpoint...
suspend...
Can not suspend container: Device or resource busy
file on unsupported FS: magic 0bad1dea
Checkpointing failed
Error: Failed to suspend container
Reason
The container which you wish to migrate uses inotify mechanism (magic 0bad1dea), that is not supported by 028stab031 and older kernels.
Solution
- for 2.6.18 rhel5 based kernels: Update till 028stab035 or newer kernel
- for 2.6.18 mainstream based kernels: Update till 028stab043 or newer kernel
- I had this problem when iptables was not installed in the guest, aptitude install iptables resolved it.
Links
Problem #3
Symptoms
After giving vzmigrate -v --online <ip address> <veid> the following message appears:
Dumping container
Setting up checkpoint...
join context..
dump...
Can not dump container: Device or resource busy
unsupported netdevice tun0
Checkpointing failed
Error: Failed to dump container
Reason
Checkpointing doesn't support tun device inside container till 2.6.18-028stab049 and 2.6.9-023stab044.14 kernels. This device is usually used for VPN via the TUN/TAP device in container.
Solution
- for 2.6.18 based kernels: update till 028stab049 or newer kernel
- for 2.6.9 based kernels: update till 023stab044.14 or newer kernel