You can clone with
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Docker and CloudFoundry Warden add abstraction on LXC and cgroups/namespace.
It's interesting to check if it's better to use those projects or to stay on LXC.
LXC is moving too. Version 0.9 will be released soon and version 1.0 (Feb 2014) will allow us to create new containers without being root : http://sourceforge.net/mailarchive/forum.php?thread_name=5122B0A9.4020508%40ubuntu.com&forum_name=lxc-devel
About docker.io there are some features that do not fit well with Heroku philosophy :
Docker depends on AUFS, it's only available by default on Ubuntu's kernel.
Docker was designed to be a Heroku dyno manager primitive. It's just slightly lower level. So, for each point:
Thanks for the clarification
It looks really great :)