Replacing the primary VM with the secondary one in a multi-server configuration

Having difficult-to-solve email issues on the primary VM in a multi-server configuration, I decided to clone the secondary twin VM (on which email services work perfectly) and transfer it to the primary server, replacing the primary VM.

In addition to the standard configuration changes, regarding ISPConfig (whose graphical interface, master, resides on a third server), is it sufficient to change the server_id value in the /usr/local/ispconfig/server/lib/config.inc.php file to that of the old primary VM?

Thanks a lot

 

@till
can you give me some ideas on what to do, thanks

 

No, I'm trying to replace a slave node with another slave node.
The machines providing the services are both ISPConfig slaves (the ISPConfig master is on another server and does just that).

It involves duplicating the slave node providing the email service and replacing the mirror slave node, which only comes into play if the first fails.