Live migrate OVZ container

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We have the p.haul project that implements live migration using CRIU. This page summarizes our experience with live-migrating OpenVZ containers.

Centos-6-x86_64-devel

Need to put container's private on NFS. To do this the /vz should be an NFS mount on both node. E.g. like this

Container should be created w/o userns support 

# vzctl create 100 --ostemplate=centos-6-x86_64-devel --local_uid=0 --local_gid=0

The following BUGs affect migration

Blockers
https://bugzilla.openvz.org/show_bug.cgi?id=2874 -- init and crond use fsnotify/inotify which will not work on NFS
Would be nice to fix
https://bugzilla.openvz.org/show_bug.cgi?id=2873 -- killing udev solves the problem, as nobody has files opened on devtmps after it
https://bugzilla.openvz.org/show_bug.cgi?id=2870 -- you can create a symlink /usr/bin/tar -> /bin/tar inside container to workaround
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