[lxc-users] Networking not working in unconfined overlayfs container

[Frederico Araujo]

Hi Serge,

Yes, I downloaded a fresh template for ubuntu and its overlay clones start
okay, and I'm able to attach and run commands on them. However, eth0 has no
IP assigned when unconfined.

I think the problem might be related to changes in systemd (I'm using
version 219) and overlayfs on vivid. I do see many permission denied
messages in the boot logs of the container (please see attached an example
output), but couldn't find much help online.

lxc-attach -n test -- ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:16:3e:23:59:24
          inet6 addr: fe80::216:3eff:fe23:5924/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4285 (4.2 KB)  TX bytes:648 (648.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:24 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1888 (1.8 KB)  TX bytes:1888 (1.8 KB)

lxc-attach -n test -- ps -ef
UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 15:45 ?        00:00:00 /sbin/init
root       352     1  0 15:45 ?        00:00:00
/lib/systemd/systemd-journald
root       613     1  0 15:45 ?        00:00:00 /usr/sbin/cron -f
syslog     673     1  0 15:45 ?        00:00:00 /usr/sbin/rsyslogd -n
root       710     1  0 15:45 ?        00:00:00 /usr/sbin/sshd -D
root       760     1  0 15:45 pts/1    00:00:00 /sbin/agetty --noclear
--keep-baud pts/1 115200 38400 9600 vt220
root       770     1  0 15:45 lxc/console 00:00:00 /sbin/agetty --noclear
--keep-baud console 115200 38400 9600 v
root       780     1  0 15:45 pts/2    00:00:00 /sbin/agetty --noclear
--keep-baud pts/2 115200 38400 9600 vt220
root       790     1  0 15:45 pts/0    00:00:00 /sbin/agetty --noclear
--keep-baud pts/0 115200 38400 9600 vt220
root       800     1  0 15:45 pts/3    00:00:00 /sbin/agetty --noclear
--keep-baud pts/3 115200 38400 9600 vt220
root       913     0  0 15:50 pts/2    00:00:00 ps -ef

Thanks!

Best,
Fred


On Mon, Oct 5, 2015 at 11:49 AM, Serge Hallyn <serge.hallyn at ubuntu.com>
wrote:

> Quoting Frederico Araujo (araujof at gmail.com):
> > Hi,
> >
> > I've been using LXC for over two years without problems. This week, I
> > upgraded my Ubuntu from Trusty to Vivid, and I noticed that my overlayfs
> > containers stopped getting IP assigned. In my machine the error can be
> > reproduced in this way:
> >
> > 1. lxc-create -n base -t ubuntu
>
> Do you have this problem if you use the download template?
>
> > 2. Edit ubuntu/config to add  lxc.aa_profile = unconfined
>
> interesting that it has to be unconfined.
>
> if you tail -f /var/log/syslog and then start the container, does
> the tail -f output show any DENIED messages?
>
> > 3. lxc-clone -s -B overlayfs ubuntu tmp
>
> Does the 'ubuntu' container start ok?
>
> > 4. lxc-start -n tmp -d
> > 5. lxc-ls -f shows:
> >
> > NAME                       STATE    IPV4        IPV6  GROUPS  AUTOSTART
> > -----------------------------------------------------------------------
> > tmp                        RUNNING  - *(no IP)*   -     -       NO
> > ubuntu                     STOPPED  -           -     -       NO
>
> Are you able to lxc-attach -n tmp and look around?  what does 'ps -ef'
> and 'ifconfig -a' show?
>
> > Interestingly, I don't run into this issue when running the container in
> > confined mode (without lxc.aa_profile = unconfined). I checked past
> threads
> > in this list and in launchpad, and noticed that some people had problems
> > with overlayfs when upgrading to vivid, but it seems that these problems
> > were fixed in LXC 1.1 release. I'm running on LXC 1.1.2.
> >
> > Any thoughts?
> >
> > Thanks,
> > Fred
>
> > _______________________________________________
> > lxc-users mailing list
> > lxc-users at lists.linuxcontainers.org
> > http://lists.linuxcontainers.org/listinfo/lxc-users
>
> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxcontainers.org/pipermail/lxc-users/attachments/20151005/68a119b5/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: test.log
Type: application/octet-stream
Size: 7885 bytes
Desc: not available
URL: <http://lists.linuxcontainers.org/pipermail/lxc-users/attachments/20151005/68a119b5/attachment-0001.obj>