Originally Posted by Hans
Thanks for this useful information.
I do have all the IP-addresses, full qualified domain names and host names in the /etc/hosts file of every ISPConfig server.
In case i add additional (extra IP-addresses) for example a website with dedicated IP and SSL on a slave server, do i also need to add that extra IP-address to every single /etc/hosts file as well?
No. Only the server hostname has to be added. I've changed it in ispconfig now so that the first IP stays as eth0. But I'am not sure if this breaks other setups as some other devs had reported thyt the main IP has to be always the last one on their servers or mysql will break in the way as you decribed.