doc: Document a workaround for using an FQDN as hostname

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
2020-10-10 10:48:54 -07:00
parent f93dcb9b6e
commit 4a600af1b1
2 changed files with 10 additions and 2 deletions
@@ -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).
      '';
    };