== Ansible Lab ==

In this lab, you will install and use Ansible to install MySQL/MariaDB and create database remotely. 

'''Requirements:'''

Participants are requested to have a computer with Windows 8/10/11 (8GB RAM, 25GB free disk space) with Virtualbox (version 6 or higher) hypervisor and PuTTY installed.[[BR]]
 
In Virtualbox, 'Extension pack' should be installed.

A wired internet connection is preferred.

[[BR]]

'''Virtual Machine (VM) Setup''' 

Download VM from the following Link. 

https://docs.learn.ac.lk/index.php/s/YcojJ2544b40Zw4

Import the VM to Virtualbox.[[BR]]

Username and Password: '''docker''' [[BR]]

May have to create Virtualbox Host-Only Network Adapter[[BR]]

{{{
File > Host Network Manager > Create
}}}

Test internet connectivity.[[BR]]

This setup needs 3 VMs (one as control node and the others will be managed nodes). Import the same VM image and setup 3 VMs accordingly.

Login and check IP addresses of all VMs.

{{{
ip add
}}}

If they are same, then change them accordingly. You may disable dhcp and assign static IP addresses according to your setups.

{{{
vi /etc/netplan/00-installer-config.yaml
 enp0s8:
      addresses : [192.168.56.105/24]
:wq
netplan apply
}}}  

Login using PuTTY. 

[[BR]]

'''Setup Network'''

Connect all VMs to 'Internal Network'.

{{{
Settings > Network > Adpater 3
}}}

[[Image(internal net.png)]]

Find the 'Internal Network' network interface.


{{{
ip add
}}}

Edit network configurations of VMs according to your setups.


{{{

vi /etc/netplan/00-installer-config.yaml
 enp0s9:
      addresses : [10.1.1.1/24]
:wq
netplan apply
}}}

Repeat the above steps in each machine accordingly and test the network connectivity.

'''Setup Nodes'''

''In control node''

Login as root to the node.

Change the hostname.

{{{
hostnamectl set-hostname controlnode
nano /etc/hosts
}}}


{{{
127.0.0.1 localhost
127.0.1.1 controlnode
}}}

{{{
reboot
}}}

Install Ansible

{{{
apt install ansible
}}}

''In each managed node''

Login as root to the node and change hostname. Each should have a unique hostname. 

{{{
hostnamectl set-hostname m1
nano /etc/hosts
}}}

{{{
127.0.0.1 localhost
127.0.1.1 m1
}}}

{{{
reboot
}}}

'''Setup Passwordless SSH'''

Login to control node as normal user.

{{{
ssh-keygen -t rsa
}}}

Continue by entering the prompts.

{{{
cat /home/docker/.ssh/id_rsa.pub
}}}

Copy the ssh keys (the output of the above command) generated on the control node, paste and save it in the authorized_keys file on both managed nodes.

{{{
nano /home/docker/.ssh/authorized_keys
}}}

Verify passwordless ssh from control node to other nodes.


{{{
ssh docker@<managed node internal network IP address>
}}}


'''Add the managed nodes to control node Ansible hosts file'''

Login as root to the control node.
{{{
nano /etc/ansible/hosts
}}}

Insert the following with the required changes according to your setting. 
{{{
[Dbservers]

db1 ansible_ssh_user=docker ansible_ssh_host=<first managed node IP address>

db2 ansible_ssh_user=docker ansible_ssh_host=<second managed node IP address>
}}}


{{{
Verify connectivity
}}}
 
{{{
ansible -m ping Dbservers
}}}

'''Create the Playbook - In control node - As root''' 

{{{
nano <playbook name>.yml
}}}

{{{
- name: setup mysql 
  become: yes
  hosts: Dbservers
  vars:
    - user: test
    - password: M@#567uers
    - db: testdb
  tasks:
    - name: installing mysql and dependencies
      package:
       name: "{{item}}"
       state: present
       update_cache: yes
     loop:
       - mysql-server
       - mysql-client 
       - python3-mysqldb
       - libmysqlclient-dev
     become: yes
    - name: start and enable mysql service
      service:
        name: mysql
        state: started
        enabled: yes
    - name: creating mysql user 
      mysql_user:
        name: "{{user}}"
        password: "{{password}}"
        priv: '*.*:ALL'
        host: '%'
        state: present
    - name: creating db
      mysql_db:
        name: "{{db}}"
        state: present
  handlers:
    - name: restart mysql
      service:
        name: mysql
        state: restarted
}}}

'''Run the Playbook - In control node - As root'''

{{{
ansible-playbook <playbook name>.yml -e
}}}

'''Verify results - In managed nodes'''

{{{
mysql -u root -p
show databases;
}}}