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Michael Weiss 234d95a6fc
nixos/networking: Add the FQDN and hostname to /etc/hosts
This fixes the output of "hostname --fqdn" (previously the domain name
was not appended). Additionally it's now possible to use the FQDN.

This works by unconditionally adding two entries to /etc/hosts:
127.0.0.1 localhost
::1 localhost

These are the first two entries and therefore gethostbyaddr() will
always resolve "127.0.0.1" and "::1" back to "localhost" [0].
This works because nscd (or rather the nss-files module) returns the
first matching row from /etc/hosts (and ignores the rest).

The FQDN and hostname entries are appended later to /etc/hosts, e.g.:
127.0.0.2 nixos-unstable.test.tld nixos-unstable
::1 nixos-unstable.test.tld nixos-unstable
Note: We use 127.0.0.2 here to follow nss-myhostname (systemd) as close
as possible. This has the advantage that 127.0.0.2 can be resolved back
to the FQDN but also the drawback that applications that only listen to
127.0.0.1 (and not additionally ::1) cannot be reached via the FQDN.
If you would like this to work you can use the following configuration:
```nix
networking.hosts."127.0.0.1" = [
  "${config.networking.hostName}.${config.networking.domain}"
  config.networking.hostName
];
```

Therefore gethostbyname() resolves "nixos-unstable" to the FQDN
(canonical name): "nixos-unstable.test.tld".

Advantages over the previous behaviour:
- The FQDN will now also be resolved correctly (the entry was missing).
- E.g. the command "hostname --fqdn" will now work as expected.
Drawbacks:
- Overrides entries form the DNS (an issue if e.g. $FQDN should resolve
  to the public IP address instead of 127.0.0.1)
  - Note: This was already partly an issue as there's an entry for
    $HOSTNAME (without the domain part) that resolves to
    127.0.1.1 (!= 127.0.0.1).
- Unknown (could potentially cause other unexpected issues, but special
  care was taken).

[0]: Some applications do apparently depend on this behaviour (see
c578924) and this is typically the expected behaviour.

Co-authored-by: Florian Klink <flokli@flokli.de>
2020-05-25 14:06:25 +02:00
.github actions/editorconfig: disable until we can combine this with ofborg (#88608) 2020-05-22 13:15:13 +00:00
doc agda: fix typo in library management documentation 2020-05-24 14:20:05 +02:00
lib lib.fake{Sri => Hash}: fix and rename 2020-05-11 23:11:12 +01:00
maintainers Merge pull request #82753 from Kloenk/feature/engelsystem 2020-05-24 16:31:23 +02:00
nixos nixos/networking: Add the FQDN and hostname to /etc/hosts 2020-05-25 14:06:25 +02:00
pkgs Merge pull request #88832 from r-ryantm/auto-update/lyra 2020-05-25 07:01:06 -05:00
.editorconfig .editorconfig: fix invalid value for diffs/patches 2020-05-20 12:55:26 +10:00
.gitattributes gitattributes: disable merge=union in all-packages 2018-03-27 11:03:03 -05:00
.gitignore common-updater-scripts: ignore update-git-commits.txt 2020-04-15 09:45:25 -03:00
.version 20.09 is Nightingale 2020-02-10 14:14:18 -05:00
COPYING COPYING: include 2020 2020-01-11 15:17:22 -08:00
default.nix Fix local path to release notes in error message 2018-10-08 05:43:15 -05:00
flake.nix Don't pin 'nixpkgs' in the system registry by default 2020-04-03 14:41:48 +02:00
README.md README.md: 20.03 release 2020-04-13 19:20:08 -04:00

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