[Lxc-users] "hostname --fqdn" returns just an error message

[Matthijs Kooijman]

Hi Harald,

> Running "hostname --fqdn" in an lxc client returns an error
> message on stderr and an empty string on stdout:
hostname --fqdn basically does a name lookup on whatever "hostname"
returns (I think it does a forward lookup on the short hostname and then
does a reverse lookup on the result to get the fqdn, but I'm not 100%
sure). It is up to you to make sure that it actually returns something.

On most systems (like your host, probably), this is done by including a
line in /etc/hosts, like:

127.0.1.1       grubby.stderr.nl grubby

The line above is added by a recent Debian installer, I think a more
traditional line is:

127.0.0.1       grubby.stderr.nl grubby localhost

An alternative is to make sure that you configure the right search
domain in /etc/resolv.conf, such that resolving your plain hostname
actually works.

Another alternative is to configure the fqdn as the short hostname,
(e.g., lxc.utsname = grubby.stderr.nl), but I'm not 100% sure if that's
really a robust solution (I'm using it nonetheless, so I don't need to
hardcode the hostname in /etc/hosts, just in the lxc configuration, and
because I use the .local avahi domain for the fqdn which doesn't play
well as the DNS search domain).

Gr.

Matthijs
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