Hi ; I've never tried clustering, but I'm willing to. - are clustering installation still supported ? - install documentation about clustering are very old (debian 6 / 8), do you thing they are still valid for actuel distro ? - is it possible, on a basic installation (standalone web mysql email dns) to add a new server, which will be in a cluster (or mirror) with actual services ? Thanks.
Yes. There is a Version for Ubuntu 20.04 and Debian 10. Should be the same process for Debian 11/12 / Ubuntu 22.04/24.04 https://www.howtoforge.com/tutorial/ispconfig-multiserver-setup-debian-ubuntu/ Not sure if it is possible to convert this into a multiserver setup. I would rather install a new multiserver setup and then use the migration toolkit to move the data to the new servers
