Continuous Delivery with Docker and Jenkins

Ad hoc commands

The simplest command we can run is a ping on all servers.

$ ansible all -m pingweb1 | SUCCESS => {      "changed": false,      "ping": "pong"}web2 | SUCCESS => {      "changed": false,      "ping": "pong"}

We used the -m <module_name> option, which allows specifying the module that should be executed on the remote hosts. The result is successful, which means that the servers are reachable and the authentication is configured correctly.

A full list of modules available in Ansible can be found on the page: http://docs.ansible.com/ansible/modules.html.

Note that we used all, so that all servers would be addressed, but we could also call them by the group name webservers or by the single host alias. As a second example, let's execute a shell command ...