Ansible is a powerful automation engine that simplifies deploying systems and apps. Its popularity has been rising rapidly as developers and system administrators look for simpler ways to manage servers and deploy applications. The selling points of Ansible are: simplicity, agentless and extensible.
ServerGrove, traditionally a Capistrano/Capifony user, decided to give Ansible a try. They include the steps to go through to get the correct environment set up and how to execute commands on the remote servers. There's also an example of a sample task that updates packages on the remote server, moves a config file into place and restarts Apache. With this foundation, they get into the actual Symfony2 deployment, sharing their custom role that sets up the directory, clones the Git repository, runs Composer and executes an Assetic dump.