[lxc-devel] [PATCH] Add mechanism for container to notify host about end of boot

[Christian Seiler]

> I like the idea but haven't looked at the implementation yet as the
> patch is really quite large. Quickly scanning through I briefly noticed
> that the copyright headers for the new files are wrong (refer to IBM and
> Daniel instead of Christian).

I just copy&pasted them from the other files, most header files I saw
contained the same copyright. Just tell me what exactly to put there and
then I'll do that for the next version of the patch.

> I'm also wondering if we shouldn't try to keep the "protocol" a bit more
> generic to eventually allow the container to send/receive more than just
> its status?

If we want to have a back-channel, we'd need a socket, which makes just
doing echo RUNNING > /dev/lxc-notify impossible, you'd need a special
program for that. Having the template scripts dump an additional script
or upstart job or systemd unit file or whatever in the container when
creating it seems a lot easier than having to use a special program.

On the other hand, it wouldn't be too complicated to have two special
files lying around: One for simple status updates using the current text
interface (easily scriptable, not much hassle to get basic status
notification functionality right) and a socket that supports an
extensible (binary?) protocol, which currently also only allows one to
change the status. But because it's extensible, the interface would
already be there.

Christian