Name resolution of dot terminated hostnames

Florian Weimer
Fri May 24 19:20:00 GMT 2019

* Etienne Buira:

> On a Gentoo box (with Gentoo packaged glibc 2.29-r2), libc was unable to
> resolve 'localhost.' (with the trailing dot), although it can resolve
> 'localhost', and conf looks fine.
> With older libcs, (at least 2.28 based), libc can resolve the dot
> terminated hostname just fine.

What's your /etc/nsswitch.conf file?  What's in /etc/hosts?

> hostname(7) man page reads 'If the input name ends with a trailing dot,
> the trailing dot is removed, and the remaining name is looked up with no
> further processing.'

This covers DNS processing (“Internet name resolver”) only.  A newer
version of the manpage should reflect that more


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