unevenpancake / ansibledemo

Simplistic demo to showcase Ansible features

Ansible Demo

This is a simplistic demo of a few of Ansible's features. It will install an Apache server with SSL and PHP on a pair of web servers, and a MySQL database on a separate database server.

Requirements

Ansible relies on SSH and Python.

• An SSH client (preferably OpenSSH) must be installed on the control machine.
• An SSH server (preferably OpenSSH) must be running on each managed node.
• Python 2.6 or later must also be installed on each managed node.
• You must define the three hosts (web01, web02, db01) in DNS, hosts files, or SSH configs so the machines can resolve them properly.
• The control node must be able to SSH to all managed nodes. This includes setting proper firewall rules.
• The webservers must have a route to the database.
• A user on each managed node with sudo privileges. For simplicity, the user should have the same password on all managed nodes.

Environment

Servers

Three total servers will be configured: two webservers (web01 and web02), and one database server (db01). The nodes can be physical servers, virtual machines, or cloud-based images as long as they meet the requirements above. This code was written and tested againt Ubuntu 16.04 machines. It should work with any Ubuntu-based distro (and really, any Debian-based distro), but it has not been tested as such.

Software

Ansible 2.2.2.0 was installed on the control machine. Python 2.7.12 was installed on all servers.

User Authentication

The control node should have an SSH keypair generated. The public key should be added to the authorized_keys file on each managed node and the private key should be added to the ssh-agent on the control node.

Running the Playbook

ansible-playbook -i hosts -K demo.yml  

-i hosts forces the playbook to use the inventory file hosts in the current directory, provided by the repo.
-K prompts the user for the sudo password for the user on the managed nodes.