rohan-lakhani/Ansible-101

All about ansible and automating servers

Ansible-101

This repository contains the code for the Ansible 101 workshop.

Prerequisites

• Ansible 2.2 or higher

Setup

• Clone this repository

Perform these commands in master node:

• sudo apt-get update
• sudo -i
• apt-get install python3
• apt-get install python3-pip
• python3 --version
• pip3 --version or pip --version
• apt-get update
• apt-get install software-properties-common
• apt-add-repository ppa:ansible/ansible
• apt-get update
• apt-get install ansible
• ansible --version

Add hosts to /etc/ansible/hosts -

• vi /etc/ansible/hosts

[webservers]
192.168.2.1
192.168.2.2

• ansible all --list-hosts - to check if hosts are added

• ssh-keygen

• cat /root/.ssh/id_rsa.pub

Add the public key to the remote hosts

Here we are going to add the copied key to the slave nodes.

• login to the slave nodes
• vi /root/.ssh/authorized_keys or sudo vi /root/.ssh/authorized_keys
• paste the copied key in both the slave nodes

Perform these commands in master node:

• ssh then enter yes - to check if the connection is established, and you will be logged in to the slave node, do same for the other slave node

• ansible all -m ping - to check if the connection is established

• ansible all -m shell -a "free -m" - to check the memory of the slave nodes.

• ansible all -m shell -a "df -h" - to check the disk space of the slave nodes.

• ansible all -m shell -a "uptime" - to check the uptime of the slave nodes.

• ansible all -m shell -a "cat /etc/os-release" - to check the OS of the slave nodes.

• ansible all -m shell -a "cat /etc/hostname" - to check the hostname of the slave nodes.

Setup ansible.cfg

• vi /etc/ansible/ansible.cfg

[defaults]
inventory = /etc/ansible/hosts
host_key_checking = False

Create Playbook

• vi playbook.yml

---
- name: Install nginx 
  hosts: webservers  
  tasks:    
    - name: install nginx 
      apt: 
        name: nginx
        state: latest
        update_cache: yes
    - name: start nginx 
      service:
        name: nginx 
        state: started 

• ansible-playbook playbook.yml - to run the playbook

• ansible-playbook playbook.yml --check - to check the playbook

• Check the nginx installation in the slave nodes, go to the browser and type the ip of the slave nodes, you will see the nginx welcome page.

*for checking the installation of nginx in slave nodes use this command --> systemctl status nginx

if the page is not displayed, then check the inbound rules in the security group of the slave nodes.

These are inbound rules:

• HTTP 80
• Access Anywhere - IPv4
• Access Anywhere - IPv6

This is the instruction to setup the Ansible 101 workshop.