Ansible and MacOS

As of 2.0 ansible uses a few more file handles to manage its forks, OS X has a very low setting so if you want to use 15 or more forks you’ll need to raise the ulimit, like so

sudo launchctl limit maxfiles 1024 unlimited.

Or just any time you see a “Too many open files” error.

Source: http://docs.ansible.com/ansible/intro_installation.html