[Lxc-users] Cannot connect to a LXC container in Amazon EC2

[Roberto Aloi]

Hi all,

I have an EC2 instance running inside a VPC. I need to run a service inside
a LXC container started in that instance and to make the service available
to the outside world.

I have therefore created a bridge (`br0`) and used the following
`/etc/network/interfaces` file to get the IP address provided by EC2
(`10.0.3.1`) associated to the bridge:

    auto lo
    iface lo inet loopback

    auto eth0
    iface eth0 inet dhcp

    auto eth1
    iface eth1 inet manual

    auto br0
    iface br0 inet dhcp
      netmask 255.255.0.0
      bridge_ports eth1
      bridge_stp off
      bridge_maxwait 0
      post-up brctl setfd br0 0

This is what I get from `ifconfig`:

    br0       Link encap:Ethernet  HWaddr 16:2b:ae:07:29:82
              inet addr:10.0.3.1  Bcast:10.0.255.255  Mask:255.255.0.0
              inet6 addr: fe80::142b:aeff:fe07:2982/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:11 errors:0 dropped:0 overruns:0 frame:0
              TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:1026 (1.0 KB)  TX bytes:1238 (1.2 KB)

    eth0      Link encap:Ethernet  HWaddr 16:2b:ae:0a:db:b6
              inet addr:10.0.67.62  Bcast:10.0.255.255  Mask:255.255.0.0
              inet6 addr: fe80::142b:aeff:fe0a:dbb6/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:229 errors:0 dropped:0 overruns:0 frame:0
              TX packets:217 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:25889 (25.8 KB)  TX bytes:23330 (23.3 KB)
              Interrupt:27

    eth1      Link encap:Ethernet  HWaddr 16:2b:ae:07:29:82
              inet6 addr: fe80::142b:aeff:fe07:2982/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:14 errors:0 dropped:0 overruns:0 frame:0
              TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:1222 (1.2 KB)  TX bytes:1798 (1.7 KB)
              Interrupt:28

    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:16436  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

The problem here is that I cannot reach the LXC container, which has IP
address `10.0.3.2`:

    user at ip-10-0-67-62:~$ ping 10.0.3.2
    PING 10.0.3.2 (10.0.3.2) 56(84) bytes of data.
    From 10.0.67.62 icmp_seq=1 Destination Host Unreachable
    ...

Any hint or suggestion on how to debug this would be much appreciated.

-- 
Roberto
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