[Lxc-users] eth0 not coming online in LXC environment

Fri Apr 5 14:39:49 UTC 2013

Interesting discovery. This networking issue only happens on one of 2
servers I now have LXC running on. I tried apt-get update and apt-get
upgrade on the host, no discernible difference. I built them off the same
build doc (which I wrote). I went through it again to see if I missed
anything, but they seem the same (only thing of note in the server build
process would be that lxcbr0 and virbr0 are both disabled, everything else
is vanilla 12.10). 

The only other thing that *might* be different that I can think of is that I
did a reboot on the 2nd server to test it, I might have skipped that step on
the 1st one which is exhibiting the problem (I can't reboot it at the moment
because one of the containers is busy for a few days of processing).

Both of these instances have the same LXC containers running, I copied them
from one to the other and updated the config's appropriately.

Dave

From: Fajar A. Nugraha [mailto:list at fajar.net] 
Sent: Friday, April 05, 2013 6:00 PM
To: David Parks
Cc: LXC
Subject: Re: [Lxc-users] eth0 not coming online in LXC environment

Now that's weird!

I'm sure Serge would love to get more details about your setup (e.g.
software versions, how you create the containers, etc). In the mean time, if
you're using Ubuntu-packaged lxc, can you try:

- apt-get update and upgrade, to make sure you have latest version of kernel
and lxc

- install new container using ubuntu template: "lxc-create -t ubuntu ...."

I don't know about ubuntu-cloud template, but the normal ubuntu template
works fine for me.

-- 

Fajar

On Fri, Apr 5, 2013 at 4:13 PM, David Parks <davidparks21 at yahoo.com> wrote:

Oops, forgot that important detail, running Ubuntu 12.10 as the host OS
installed off media, and I have 12.10 running in these LXC containers built
from the Ubuntu cloud distros (12.10 64bit).  

From: Fajar A. Nugraha [mailto:list at fajar.net] 
Sent: Friday, April 05, 2013 4:09 PM
To: David Parks
Cc: LXC
Subject: Re: [Lxc-users] eth0 not coming online in LXC environment

On Fri, Apr 5, 2013 at 10:33 AM, David Parks <davidparks21 at yahoo.com> wrote:

I've got an environment set up now where the host OS has a static IP
directly connected to the LAN. I'm bridging the containers to have their own
static LAN IP as well.

When I start my container eth0 is *not* configured. If I manually add
`eth0=eth0` in /run/network/ifstate and `service restart networking`, it
gets configured properly.

After looking at dmesg output I noticed that there are (unexpected)
references to em1, which is the host's physical NIC.

The bridging all works, networking is fine, it's just when I start the
container, rebooting reproduces the problem, then manually updating ifstate
and rebooting resolves it.

I'm not sure how to configure it so it configure eth0 on reboot as I would
expect.

Well, a description on which distro/version you're running as host and
container would be nice.

Short version is if you use Ubuntu (preferably quantal/raring for newer lxc
version, but precise is also fine), then it will just work. If you use some
other combination (e.g. Centos for container), then be prepared for hickups.

I had problems with Centos container, and the "fix" was to force-clean
/var/run and /var/lock/subsys on container startup:
https://github.com/fajarnugraha/lxc/blob/centos-template/templates/lxc-cento
s.in#L90

-- 

Fajar

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