[systemd-devel] nss-myhostname: why don't loopback interfaces appear?

[Dimitri John Ledkov]

On 3 June 2015 at 06:40, Daurnimator <quae at daurnimator.com> wrote:
>
> I was playing around with nss, and found that my loopback interface ip
> doesn't appear from nss-myhostname.
> Rather, my other ones do.
> Furthermore, unless I request IPv4, link-local IPv6 addresses are
> returned. Is this expected?
>

So in my case, I don't have /etc/hosts file at all and use
nss-myhostname et.al. modules. Specifically I have nsswitch.conf like
so:
hosts:          files myhostname resolve dns mymachines

My naive expection for the following call:
# getent hosts `hostname`

To return something like, e.g.:
127.0.1.1       $hostname $hostname.$domain

But instead I get:
fe80::5054:ff:fe12:3456 $hostname

Whist it is perfectly valid, it's atypical from "usual" setups
elsewhere. And subtle things seem to rely on the "usual" setup, e.g.
Erlang Port Mapper Daemon / zerromq fail to start, as hostname ->
127.0.*.* -> localhost mappings are kind of expected. (there were
other things as well, that were fixed up by other people)

Sure, I could fix the world to connect/resolve localhost, instead of
`hostname`, but for the time being this situation became defacto
expected =( I would like to see an option to myhostname module to
return 127.0.1.1 when asking for current machine `hostname`.

-- 
Regards,

Dimitri.
Pura Vida!

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