[lxc-users] Container to container comms by hostname

[Jamie Brown]

Hi,

I’m using the default network configuration from LXD with lxcbr0 and 10.0.3.* IP range.

If I create multiple containers (ubuntu:14.04) then I am able to contact these containers from within each other by hostname.

e.g.
container1
container2
container3

Within container2 I can simply run ‘ping container1’ and it manages to resolve the IP without any further configuration.

However, if I then delete container1 and re-create it, the IP address of container1 may change (via DHCP) and when I try to ping container1 from container2 I simply receive “ping: unknown host container1”.

I’m not sure what the intended behaviour is here, I was really happy when I realised I could simple communicate between containers by container name (host name), but now I’m not so sure it is a reliable method.

Could someone outline the intended behaviour here, and perhaps recommend a more reliable way of container to container communication without relying on knowing the IP addresses?

Thanks,

Jamie
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