[pve-devel] [PATCH container/manager 0/2] fix #3413: Add `Disconnect` option for LXC networks

Christoph Heiss c.heiss at proxmox.com
Mon Feb 13 14:56:58 CET 2023

This adds a `Disconnect` option for network interfaces on LXC
containers, much like it already exists for VMs. This has been requested
in #3413 [0] and seems useful, esp. considering we already support the
same thing for VMs.

One thing to note is that LXC does not seem to support the notion of
setting an interface down. The `flags` property would suggest that this
possible [1], but AFAICS it does not work. I tried setting the value as
empty and to something else than "up" (since that is really the only
supported option [2][3]), which both had absolutely no effect.

The solution was to force the host-side link of the container network
down, thus effectively becoming "physically" disconnected.

[0] https://bugzilla.proxmox.com/show_bug.cgi?id=3413
[1] https://linuxcontainers.org/lxc/manpages/man5/lxc.container.conf.5.html#lbAO
[2] https://github.com/lxc/lxc/blob/08f0e769/src/lxc/confile.c#L453-L467
[3] https://github.com/lxc/lxc/blob/08f0e769/src/lxc/confile.c#L5933-L5952


Christoph Heiss (1):
      net: Add `link_down` config to allow setting interfaces as disconnected

 src/PVE/LXC.pm        | 20 +++++++++++++-------
 src/PVE/LXC/Config.pm |  5 +++++
 src/lxcnetaddbr       |  3 ++-
 3 files changed, 20 insertions(+), 8 deletions(-)


Christoph Heiss (1):
      lxc: Add `Disconnect` option for network interfaces

 www/manager6/Parser.js      |  3 +++
 www/manager6/lxc/Network.js | 13 +++++++++++++
 2 files changed, 16 insertions(+)


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