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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
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@ -605,8 +605,8 @@ systemd.services.nginx.serviceConfig.ReadWritePaths = [ "/var/www" ];
<listitem> <listitem>
<para> <para>
In addition to the hostname, the fully qualified domain name (FQDN), In addition to the hostname, the fully qualified domain name (FQDN),
which consists of <literal>${cfg.hostName}</literal> and which consists of <literal>${networking.hostName}</literal> and
<literal>${cfg.domain}</literal> is now added to <literal>${networking.domain}</literal> is now added to
<literal>/etc/hosts</literal>, to allow local FQDN resolution, as used by the <literal>/etc/hosts</literal>, to allow local FQDN resolution, as used by the
<literal>hostname --fqdn</literal> command and other applications that <literal>hostname --fqdn</literal> command and other applications that
try to determine the FQDN. These new entries take precedence over entries 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 or digit, and have as interior characters only letters, digits, and
hyphen. The maximum length is 63 characters. Additionally it is hyphen. The maximum length is 63 characters. Additionally it is
recommended to only use lower-case characters. 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> </para>
</listitem> </listitem>
<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 end with a letter or digit, and have as interior characters only
letters, digits, and hyphen. The maximum length is 63 characters. letters, digits, and hyphen. The maximum length is 63 characters.
Additionally it is recommended to only use lower-case 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).
''; '';
}; };