There is no "How To" manual for either.
Job Server (Identity Manager Service) installation requirements and instructions are provided in the Getting Started Guide: Identity Manager 6.1.2 – Getting Started
As per the guide, for the Identity Manager Service on a Linux Operating System, Mono 2.11 or later is required: Linux Operating System
Web Server installation requirements and instructions are provided in the Web Portal Installation Guide: Identity Manager 6.1.2 – Web Portal Installation Guide
As per the guide, Mono 2.11 is a software prerequisite.
You may download a copy of both guides here: Identity Manager - Release Notes and Guides
Please check the documentation for earlier versions of Identity Manager for the specific requirements.