Regardless of the technology you use to build your web applications, you’ll also need to administer the web server(s) using their native technologies: typically Linux and the BASH shell. You can also automate many common system administration tasks using Capistrano.
Everything from source control and migrations to Capistrano, rake tasks and beyond. How to deploy your applications to multiple production servers with a single command using Capistrano. How to setup a Rails/Nginx/Mongrel cluster for applications with high scalabilty needs.
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Automating UNIX and Linux Administration (The Expert's Voice)