Hi, This tutorial to install ISP Config on distro Ubuntu 20.04 prompts to change the server default hostname to a subdomain name : https://www.howtoforge.com/ispconfig-autoinstall-debian-ubuntu/ Should I previously go to my hosting account (OVH) and set an “A record“ in DNS for this subdomain, e.g “apptest.mydomain.net“ ? Regards
Yes, the subdomain used for the server must exist in DNS upfront of the installation if you want to get a free Let's encrypt SSL certificate for the server. Plus, you have to change the new hostname in the files /etc/hostname and /etc/hosts and reboot the server after you changed it. Then check with command: hostname -f if the new FQDN hostname apptest.mydomain.net is returned by the command. if yes, start the installation.
