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doc: Document a workaround for using an FQDN as hostname

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Since #76542 this workaround is required to use a FQDN as hostname. See
#94011 and #94022 for the related discussion. Due to some
potential/unresolved issues (legacy software, backward compatibility,
etc.) we're documenting this workaround [0].

[0]: https://github.com/NixOS/nixpkgs/issues/94011#issuecomment-705952300
This commit is contained in:
Michael Weiss 2020-10-10 15:27:47 +02:00 committed by Jon
parent f93dcb9b6e
commit 4a600af1b1
2 changed files with 10 additions and 2 deletions
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8
nixos/doc/manual/release-notes/rl-2009.xml
View file

@ -605,8 +605,8 @@ systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/var/www" ];
<listitem>
<para>
In addition to the hostname, the fully qualified domain name (FQDN),
which consists of <literal>${cfg.hostName}</literal> and
<literal>${cfg.domain}</literal> is now added to
which consists of <literal>${networking.hostName}</literal> and
<literal>${networking.domain}</literal> is now added to
<literal>/etc/hosts</literal>, to allow local FQDN resolution, as used by the
<literal>hostname --fqdn</literal> command and other applications that
try to determine the FQDN. These new entries take precedence over entries
@ -626,6 +626,10 @@ systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/var/www" ];
or digit, and have as interior characters only letters, digits, and
hyphen. The maximum length is 63 characters. Additionally it is
recommended to only use lower-case characters.
If (e.g. for legacy reasons) a FQDN is required as the Linux kernel network node hostname
(<literal>uname --nodename</literal>) the option
<literal>boot.kernel.sysctl."kernel.hostname"</literal>
can be used as a workaround (but be aware of the 64 character limit).
</para>
</listitem>
<listitem>

4
nixos/modules/tasks/network-interfaces.nix
View file

@ -391,6 +391,10 @@ in
end with a letter or digit, and have as interior characters only
letters, digits, and hyphen. The maximum length is 63 characters.
Additionally it is recommended to only use lower-case characters.
If (e.g. for legacy reasons) a FQDN is required as the Linux kernel
network node hostname (uname --nodename) the option
boot.kernel.sysctl."kernel.hostname" can be used as a workaround (but
the 64 character limit still applies).
'';
};