[lxc-users] Remaining virtual ethernet interfaces (veth) after container has been deleted

Fri Mar 27 01:20:58 UTC 2020

Possible somewhat related:

https://discuss.linuxcontainers.org/t/is-there-a-way-to-pass-other-config-transient-true-to-vswitch/6354
https://github.com/lxc/lxd/issues/1596
https://github.com/lxc/lxc/issues/2849
https://github.com/lxc/lxc/issues/3137
https://github.com/lxc/lxc/issues/2913
https://github.com/lxc/lxc/issues/590
https://discuss.linuxcontainers.org/t/vethxxxxx-interfaces-are-not-removed-when-lxc-container-is-stopped/4816
https://discuss.linuxcontainers.org/t/serverside-veth-not-clean-shutdown-on-container-reboot-or-shutdown/4379
https://developers.redhat.com/blog/2017/12/01/open-vswitch-without-stale-ports/

I am using open vswitch and experience this issue also.

On Fri, Mar 27, 2020 at 3:36 AM Mike Wright <nobody at nospam.hostisimo.com> wrote:
>
> On 3/26/20 8:14 AM, Sebert, Holger.ext wrote:
> > Hi,
> >
> > we use LXD containers on our CI-build nodes. For each build a container is
> > created and deleted afterwards. So, container creation and deletion happens
> > quite often.
> >
> > Here is the problem: After some time, many virtual ethernet interfaces (veth*)
> > accumulate, they look like this:
> >
> > vethY59JK1 Link encap:Ethernet  HWaddr fe:12:cc:54:20:70
> >                 inet6 addr: fe80::fc12:ccff:fe54:2070/64 Scope:Link
> >                 UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >                 RX packets:60 errors:0 dropped:0 overruns:0 frame:0
> >                 TX packets:14095 errors:0 dropped:0 overruns:0 carrier:0
> >                 collisions:0 txqueuelen:1000
> >                 RX bytes:6735 (6.7 KB)  TX bytes:2417738 (2.4 MB)
> >
> > ...
> >
> > vethYCP720 Link encap:Ethernet  HWaddr fe:6c:d0:78:b0:63
> >                 inet6 addr: fe80::fc6c:d0ff:fe78:b063/64 Scope:Link
> >                 UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >                 RX packets:61 errors:0 dropped:0 overruns:0 frame:0
> >                 TX packets:14075 errors:0 dropped:0 overruns:0 carrier:0
> >                 collisions:0 txqueuelen:1000
> >                 RX bytes:6653 (6.6 KB)  TX bytes:2414750 (2.4 MB)
> >
> >
> > These interfaces are not connected to any running container and cannot be
> > removed. It seems to me that they are somehow leftovers from previous
> > containers which don't exist anymore.
>
> Hi Holger,
>
> A technique I use is to give each container's interfaces unique names on
> the host, usually the same name as the container itself.  If there is
> more than one interface I add a digit.
>
> e.g. container "zorro" has a profile named "zorro".  Here is a snip from
> "zorro's" yaml profile:
>
> devices:
>    eth0:
>      host_name: zorro  <--- will show up on the host
>
> An interface cannot be removed while it is up.
>
> ip link set dev zorro down  (short way: ip l s zorro down)
> ip link del dev zorro       (short way: ip l d zorro)
>
> A deleted interface is automagically removed from any bridge it's on.
>
> Mike Wright
> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users

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