How to install different Ruby versions on Plesk server?

Question

How to install different Ruby versions on a Plesk server?

Answer

Plesk provides its own set of Ruby interpreters which are installed to /opt/plesk/ruby/ directory.

Note: It is possible to check what versions of Ruby are currently installed by running the following command via SSH:
# ls -al /opt/plesk/ruby/
The output of ruby -v command or which ruby command indicates system version of ruby, that is installed in /usr/local/rvm/rubies/ folder path.
To install and make default ruby 2.5.1 on the system execute the command
# rvm install "ruby-2.5.1"​ and then # rvm --default use 2.5.1
Refer to the following forum thread for additional information.

To build a custom version of Ruby with a ruby-build tool apply the steps below. In this example Ruby version 3.4.5 is being installed:

1. Install Ruby Plesk extension
2. Connect to the Plesk server via SSH
3. Install the ruby-build tool:

   # mkdir -p "$(rbenv root)"/plugins
   # git clone https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ru

4. Install additional packages:
   • On Debian/Ubuntu operating systems run:

     # apt install autoconf bison build-essential libssl-dev libyaml-dev libreadline-dev zlib1g zlib1g-dev

   • On RedHat/CentOS/CloudLinux operating systems run:

     # yum groupinstall 'Development Tools'
     # yum install readline-devel libffi-devel libyaml-devel

5. Run the following commands to build Ruby:
   List available Ruby versions:

   # /root/.rbenv/plugins/ru/bin/ruby-build --list
   3.2.8
   3.3.8
   3.4.5

   # /root/.rbenv/plugins/ru/bin/ruby-build 3.4.5 /opt/plesk/ruby/3.4.5/
   # /opt/plesk/ruby/3.4.5/bin/gem install bundler
   # plesk sbin rubymng register 3.4.5 /opt/plesk/ruby/3.4.5

6. Log in to Plesk GUI

7. Go to Extensions > Ruby and click on Refresh