Borg backup to server running on main domain, but on anther machine

[samuel-ynh]

What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12
What app is this about: borg

Describe your issue

As I want to get serious with using yunohost, I want to do regular backups using borg.

I already backup my homerserver with borg, so I want to use it as the borg server.

My setup looks like this:

• Yunohost running on a VPS and reachable yia yunohost.example.org with borg installed
• Homeserver running under the stairs and reachable via example.org with borg installed

I just created users and SSH-Keys for borg on my homeserver. But I can’t connect to it from the borg server, because yunohost thinks it should reach example.org via localhost. I SSHed to yunohost and pinged for example.org and got localhost.
I can connect to the homeserver via its IP-address. But unfortunately every once in a while I get a new IP-address.
I would love to force SSH oder debian or whatever to do a regular DNS lookup for example.org and not resolve it to localhost.

Do you have any idea?

Share relevant logs or error messages

SSH to example.org:

# ssh -i .ssh/id_borg_ed25519 -p 7612 borgbackup@example.org
ssh: connect to host example.org port 7612: Connection refused

SSH to the IP:

ssh -i .ssh/id_borg_ed25519 -p 7612 borgbackup@287.2.34.2
Linux balkonien 6.1.0-25-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.106-3 (2024-08-26) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

[samuel-ynh]

Puh, I’m already a bit closer.
It’s more of a issue with my setup, than an issue with borg backup - I guess.

The reverse DNS points to yunohost.example.org, so SSH directly tries to connect to localhost.

For the time being i will try to connect via the IP address an maybe add an additionally dyndns for the borg backup.