I'm just wondering if anyone have elevated a Centos 7 to AlmaLinux 8 with ISPConfig 3.1.15 . And we plan to eventually upgrade to AlmaLinux 9. If so, any issues during the conversion? Thanks all.
Yes, I did one from CentOS 7 to AlmaLinux 8, but it was a system without ISPConfig installed. The system that I upgraded was as already mentiond a system with EL7 with a few packages from EPEL installed. The upgrade worked absolutely without any problems but I've also seen reports from others that had trouble upgrading from EL7 to EL8. If it is a productive system where longer downtimes are a huge problem then I would try to simulate an upgrade on a test system before you do it on a critical production system. Regardless of that you should take great attention at the leap preupgrade logfile. You'll likely have to modify some repository files in /etc/yum.repos.d to meet EL8 urls instead of EL7. Also self-compiled software will not work anymore on EL8, if you compiled it on EL7 and if it was built with dynamically linked libraries. You'll have to recompile that software again. After the upgrade was hopefully successfull, you can upgrade your ISPConfig to the latest 3.2.x release. As always, make sure that you have a working backup when you do anything critical on your server and if you want to be on the safe side, then I suggest to migrate your current server to a new one. It might be less stressful, depending on the circumstances, to do a migration instead of an inplace-upgrade.
Basically only older CentOS and RHEL are supported out of box but new ones and derivatives are not. Though, there are several threads where you can learn how it can be done and I believe the above reply might already have given you some ideas. Else, you might want to try Debian or Ubuntu and migrated to that instead since they are both better supported and work out of box with latest ISPConfig.
