This wiki will cover how to install LiteSpeed Web Server (LSWS) and LiteSpeed's Plesk Extension on a Plesk server. There are multiple ways to go about the installation. The wiki will only cover installing the Plesk Extension first and then installing LSWS from the extension.
This wiki assumes that you have a working Apache-Plesk setup.
Plesk 11 requires root level commands be run from the command line. To finish the installation, run the commands requested as root:
sh /usr/local/psa/admin/plib/modules/litespeed/scripts/install_scripts rm /usr/local/psa/admin/plib/modules/litespeed/scripts/install_scripts
You can now access the LiteSpeed Plesk Extension under Server Management > Extensions > Module LiteSpeed.
Click “Install LiteSpeed Web Server”.
Check “I agree” and input your license's serial number or request a trial license.
You must also set a password for LSWS's WebAdmin console. Other settings are optional, though it is recommended you install the first time with a port offset.
Other installation settings
When you're ready, click the “Install” button at the bottom.
Now, start LSWS by clicking “Restart LiteSpeed”.
LSWS requires PHP built with LSAPI. We will be building PHP through the WebAdmin console, but PHP can also be built through the command line. (When building from the command line, simply add the "--with-litespeed" option to have it built with LSAPI.)
Access the WebAdmin console by clicking “WebAdmin Console”.
Use the user name and password you set during installation to log in.
The Build PHP tool can be found under Actions > Compile PHP.
Select your PHP version number.
Configure your PHP with the options you want. Pay special attention to the Configure Parameters field. These parameters must mirror the PHP options you have with Apache for LSWS to serve your PHP sites correctly.
LSWS will prepare to build PHP. When it is done, click “Next”.
You will now be asked to run a script as root to build PHP.
Because LSWS builds PHP from source code you may have to install some missing libraries to build PHP.
Restart LSWS when the build is complete.
The beauty of the port offset is that you can run LSWS and Apache in parallel. This means you can try out your sites with LSWS to make sure they work before atually turning off Apache. In our setup, I have set the port offset to 1000. If I want to check any sites, I can do so on ports 1080 and 1443.
Once you're confident that your sites are running correctly with LSWS, it's time to switch to LSWS as your main server.