Quoting David Serrano (dserra...@gmail.com): > Hi, > > At $work we're currently using KVM and setting it up so that it uses a > previously opened TAP interface: 'kvm -net tap,fd=3'. This way, we are > able to create the interface a set up a couple of ebtables filters on > it before going on. Now, we would like to do the same with LXC. > > After taking a look to the documentation I don't think LXC is able to > get the interface from a given FD, so I guess I should look for a > workaround. I see there's a message in the LXC log that says > «instanciated veth 'vethC1zCUS/vethtCn0zY'» but the relevant container > doesn't appear in the same line. Yes it's in the previous line but > relying on that is prone to race conditions. Moreover, reading from a > debug log isn't elegant at all... > > Do I have other options I haven't considered?
Best would be to patch the LXC code to do this, and send the patch upstream. But for first, for testing and $firebrigade purposes, the way to do this by hand would be to write your own our_lxc_start.sh script which does something like #!/bin/sh devs=`ls /sys/class/net/veth*` ip link add type veth newdevs=`ls /sys/class/net/veth*` # Get the intersection of $devs and $newdevs # Attach $dev1 to your bridge lxc-start -n mycontainer # mycontainer has no network # get PID as the init pid of mycontainer ip link set $dev2 netns $PID # now from your mycontainer console, configure $dev2 which is now in the container # you can rename it to eth0 in the container as ip link set $dev2 name eth0 Something like that. Patching lxc-start to take an extra command line argument saying 'use this fd' shouldn't be a big deal. -serge ------------------------------------------------------------------------------ WhatsUp Gold - Download Free Network Management Software The most intuitive, comprehensive, and cost-effective network management toolset available today. Delivers lowest initial acquisition cost and overall TCO of any competing solution. http://p.sf.net/sfu/whatsupgold-sd _______________________________________________ Lxc-users mailing list Lxc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-users
