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Relationship between openVZ and cgroup; general structure about the patch [message #38376] Sat, 12 December 2009 11:10
mifritscher is currently offline  mifritscher
Messages: 2
Registered: October 2008
Junior Member
From: 212.6.141*
hi,

I saw that openVZ does already use cgroups.
Does it use them for all "core" thinks lxc does?
If so, why it is problematic to bring openVZ into the mainline kernel?
lxc is extremly lightweight - they seem to use plain cgroup.
And its working fairly well - ok, a few problems exists like compatibility with init-script, console and the like, but I think that could be solved in usermode.
OpenVZ has internal routing, but I guess that these could be replaced with simple route/arp calls.
The only advantages I see in the kernel-piece of openVZ are better controlling of the ressources, but I thing that this could be ported to the cgroups very easiely, and ability to have distinct iptables in the guests, but I think that this could be ported to the network namespaces, too.
Freeze/unfreeze seems to be supported, too, at least the lxc-usermode tools provide them - so adding migration shouldn't be a big problem, too.

Do I miss anything?
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