:lastproofread: 2023-10-18

.. _examples-ansible:

###############
Ansible example
###############

Setting up Ansible on a server running the Debian operating system.
===================================================================

In this example, we will set up a simple use of Ansible to configure multiple VyoS routers.
We have four pre-configured routers with this configuration:

Using the general schema for example:

.. image:: /_static/images/ansible.png
   :width: 80%
   :align: center
   :alt: Network Topology Diagram

We have four pre-configured routers with this configuration:

.. code-block:: none

	set interfaces ethernet eth0 address dhcp
	set service ssh
	commit
	save

* vyos7 - 192.0.2.105
* vyos8 - 192.0.2.106
* vyos9 - 192.0.2.107
* vyos10 - 192.0.2.108

Install the Ansible:
====================
.. code-block:: none

	# apt-get install ansible
	Do you want to continue? [Y/n] y

Install the paramiko:
=====================

.. code-block:: none

	#apt-get install -y python3-paramiko

Check the version:
==================

.. code-block:: none

	# ansible --version
	ansible 2.10.8
	config file = None
	configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
	ansible python module location = /usr/lib/python3/dist-packages/ansible
	executable location = /usr/bin/ansible
	python version = 3.9.2 (default, Feb 28 2021, 17:03:44) [GCC 10.2.1 20210110]

Basik configuration of the ansible.cfg:
=======================================

.. code-block:: none

	# nano /root/ansible.cfg
	[defaults]
	host_key_checking = no

Add all the hosts of VyOS:
==========================

.. code-block:: none

	# nano /root/hosts
	[vyos_hosts]
	vyos7 ansible_ssh_host=192.0.2.105
	vyos8 ansible_ssh_host=192.0.2.106
	vyos9 ansible_ssh_host=192.0.2.107
	vyos10 ansible_ssh_host=192.0.2.108

Add general variables:
======================

.. code-block:: none

	# mkdir /root/group_vars/
	# nano /root/group_vars/vyos_hosts
	ansible_python_interpreter: /usr/bin/python3
	ansible_network_os: vyos
	ansible_connection: network_cli
	ansible_user: vyos
	ansible_ssh_pass: vyos


Add the simple playbook with the tasks for each router:
=======================================================

.. code-block:: none

	# nano /root/main.yml
	
	---
	- hosts: vyos_hosts
	gather_facts: 'no'
	tasks:
		- name: Configure general settings for the vyos hosts group
		vyos_config:
			lines:
			- set system name-server 8.8.8.8
			- set interfaces ethernet eth0 description '#WAN#'
			- set interfaces ethernet eth1 description '#LAN#'
			- set interfaces ethernet eth2 disable
			- set interfaces ethernet eth3 disable
			- set system host-name {{ inventory_hostname }}
			save:
			true
	
Start the playbook:
==================

.. code-block:: none

	ansible-playbook -i hosts main.yml
	PLAY [vyos_hosts] **************************************************************
	
	TASK [Configure general settings for the vyos hosts group] *********************
	ok: [vyos9]
	ok: [vyos10]
	ok: [vyos7]
	ok: [vyos8]
	
	PLAY RECAP *********************************************************************
	vyos10                     : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	vyos7                      : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	vyos8                      : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	vyos9                      : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Check the result on the vyos10 router:
======================================

.. code-block:: none

	vyos@vyos10:~$ show interfaces
	Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
	Interface        IP Address                        S/L  Description
	---------        ----------                        ---  -----------
	eth0             192.0.2.108/24                    u/u  WAN
	eth1             -                                 u/u  LAN
	eth2             -                                 A/D
	eth3             -                                 A/D
	lo               127.0.0.1/8                       u/u
					::1/128
	
	vyos@vyos10:~$ sh configuration commands | grep 8.8.8.8
	set system name-server '8.8.8.8'

The simple way without configuration of the hostname (one task for all routers):
============================================================================

.. code-block:: none

	# nano /root/hosts_v2
	[vyos_hosts_group]
	vyos7 ansible_ssh_host=192.0.2.105
	vyos8 ansible_ssh_host=192.0.2.106
	vyos9 ansible_ssh_host=192.0.2.107
	vyos10 ansible_ssh_host=192.0.2.108
	[vyos_hosts_group:vars]
	ansible_python_interpreter=/usr/bin/python3
	ansible_user=vyos
	ansible_ssh_pass=vyos
	ansible_network_os=vyos
	ansible_connection=network_cli

	# nano /root/main_v2.yml
	---
	- hosts: vyos_hosts_group
	
	connection: network_cli
	gather_facts: 'no'
	
	tasks:
		- name: Configure remote vyos_hosts_group
		vyos_config:
			lines:
			- set system name-server 8.8.8.8
			- set interfaces ethernet eth0 description WAN
			- set interfaces ethernet eth1 description LAN
			- set interfaces ethernet eth2 disable
			- set interfaces ethernet eth3 disable
			save:
			true
		  
.. code-block:: none
		  
	# ansible-playbook -i hosts_v2 main_v2.yml
	
	PLAY [vyos_hosts_group] ********************************************************
	
	TASK [Configure remote vyos_hosts_group] ***************************************
	ok: [vyos8]
	ok: [vyos7]
	ok: [vyos9]
	ok: [vyos10]
	
	PLAY RECAP *********************************************************************
	vyos10                     : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	vyos7                      : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	vyos8                      : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	vyos9                      : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
	

In the next chapter of the example, we'll use the Ansible with jinja2 templates and variables.