[Lxc-users] local routing

[Ulli Horlacher]

I have a lxc host (zoo 129.69.1.68) with a container (vmtest8 129.69.8.6).

I want all host/container communication to be internal without network
traffic going via external router.

I know I can setup host routes like:

root at vms2:# route add -host 129.69.8.6 gw 129.69.1.68

root at vms2:# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
129.69.8.6      129.69.1.68     255.255.255.255 UGH   0      0        0 br0
129.69.1.0      0.0.0.0         255.255.255.0   U     0      0        0 br0
0.0.0.0         129.69.1.254    0.0.0.0         UG    100    0        0 br0

root at vms2:# lxc -c vmtest8

Type <Ctrl+a q> to exit the console

root at vmtest8:~# route add -host 129.69.1.68 gw 129.69.8.6

root at vmtest8:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
129.69.1.68     129.69.8.6      255.255.255.255 UGH   0      0        0 eth0
129.69.8.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         129.69.8.254    0.0.0.0         UG    0      0        0 eth0


root at vms2:# ping 129.69.8.6
PING 129.69.8.6 (129.69.8.6) 56(84) bytes of data.
64 bytes from 129.69.8.6: icmp_seq=1 ttl=64 time=9.54 ms
64 bytes from 129.69.8.6: icmp_seq=2 ttl=64 time=0.015 ms
64 bytes from 129.69.8.6: icmp_seq=3 ttl=64 time=0.014 ms
64 bytes from 129.69.8.6: icmp_seq=4 ttl=64 time=0.013 ms
64 bytes from 129.69.8.6: icmp_seq=5 ttl=64 time=0.015 ms
64 bytes from 129.69.8.6: icmp_seq=6 ttl=64 time=0.013 ms
^C
--- 129.69.8.6 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 4998ms
rtt min/avg/max/mdev = 0.013/1.602/9.547/3.553 ms

But I do not want to set up such host routes manually, they should be
created some kind of automatic.

With only 1 host/container pair it is not much trouble. But later I want
to have a dozen containers and they all should use internal routing.

Modifying the host and each container VM routing table manually is nasty.


-- 
Ullrich Horlacher              Server- und Arbeitsplatzsysteme
Rechenzentrum                  E-Mail: horlacher at rus.uni-stuttgart.de
Universitaet Stuttgart         Tel:    ++49-711-685-65868
Allmandring 30                 Fax:    ++49-711-682357
70550 Stuttgart (Germany)      WWW:    http://www.rus.uni-stuttgart.de/