Hello, I want to change Apache2 to openlitespeed server. I don’t know which way is easiest and I don’t know settings for vhost. Now I have several websites which are running on Apache 2, Debian 10 with ispconfig 3 could you please help me ?
I don't think ISPConfig support OpenLiteSpeed nor that I think you should change to it since you do not seem to know how to do it.
ISPConfig is not compatible with OpenLiteSpeed. The only supported webservers are, as of today, Apache HTTPD and Nginx. If you need a webserver that is reliable and definitely faster than httpd then switch to Nginx. The webserver has to be changed in the ISPConfig panel from Apache to Nginx (ofc make sure that Nginx is installed and running instead of Apache) and then afaik it is only necessary to resync the websites. Somewhere here on HTF there must be also a tutorial regarding switching the webservers. Just use the search function. If Nginx is not an option for you and you desperately need OpenLiteSpeed, or favor it over the other two webservers, then you'll have to add the code yourself to ISPConfig, fund the implementation or wait until someone else may add the support for it.