Commands for Demo of Ansible

Ansible Class

###### Ansible Installation on EC2 machine

Launch 2 AWS Ubuntu Instances, allow all traffic

## Install Ansible on Master :
sudo apt-get update && sudo apt-get install -y software-properties-common
sudo apt-add-repository ppa:ansible/ansible -y
sudo apt-get update && sudo apt-get install -y ansible
sudo apt-get update && sudo apt-get install -y docker.io
sudo apt-get update && sudo apt-get install -y maven
sudo apt --fix-broken install -y

## Install Python on Slaves
sudo apt-get update && sudo apt-get install -y python

## SSH Access from Master to Slaves
ssh ubuntu@<IP of Slaves> won't work

## On Master
cd .ssh && ls -lrt
show known_hosts and authorized keys
ssh-keygen
ls -lrt 
id_rsa.pub 
copy this content to authorized keys of Slave 

## On Slave
cd .ssh
Add the key to authorized keys

## On Master
Try the 1st ssh ubuntu@<IP of Slaves> should work now

## Set up Ansible Host and Test Connection
/etc/ansible/hosts file
Add Ansible Slave details in the file 
[group name]
slave1 ansible_ssh_host=<IP of Slave>
Optional
[all:vars]
ansible_python_interpreter=/usr/bin/python3

$ansible -m ping all
$ansible -m ping slave1
$ansible -m ping [group name]

Install something on localhost using ansible
ansible localhost -m ansible.builtin.sudo -a "name=docker state=latest" -b



ubuntu@ip-172-31-19-63:/etc/ansible/roles$ tree apache2
apache2
├── README.md
├── defaults
│   └── main.yml
├── files
│   ├── apache2.conf
│   └── copy.html
├── handlers
│   └── main.yml
├── meta
│   └── main.yml
├── tasks
│   ├── configure.yml
│   ├── install.yml
│   ├── main.yml
│   └── service.yml
├── templates
├── tests
│   ├── inventory
│   └── test.yml
└── vars
    └── main.yml

8 directories, 13 files

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ ls -lrt
total 16
-rw-r--r-- 1 root root  82 Jun 26 11:46 install.yml
-rw-r--r-- 1 root root  79 Jun 26 11:47 service.yml
-rw-r--r-- 1 root root 243 Jun 26 11:58 configure.yml
-rw-r--r-- 1 root root 118 Jun 26 12:02 main.yml

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat main.yml
---
# tasks file for apache2
- include_tasks: install.yml
- include_tasks: configure.yml
- include_tasks: service.yml


ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat install.yml
---
  - name: install apache2
    apt: name=apache2 update_cache=yes state=latest


ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat configure.yml
---
#configure apache2.conf and send copy.html file
  - name: apache2.conf file
    copy: src=apache2.conf dest=/etc/apache2/
    notify:
     - restart apache2 service

  - name: send copy.html file
    copy: src=copy.html dest=/var/www/html/

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat service.yml
---
  - name: starting apache2 service
    service: name=apache2 state=started


ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/files$ ls -lrt
total 12
-rw-r--r-- 1 root root 7224 Jun 26 11:49 apache2.conf
-rw-r--r-- 1 root root   88 Jun 26 11:50 copy.html


ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/handlers$ ls -lrt
total 4
-rw-r--r-- 1 root root 108 Jun 26 11:52 main.yml
ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/handlers$ cat main.yml
---
# handlers file for apache2
  - name: restart apache2 service
    service: name=apache2 state=restarted



ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/meta$ ls -lrt
total 4
-rw-r--r-- 1 root root 1634 Jun 26 11:54 main.yml


ubuntu@ip-172-31-19-63:/etc/ansible$ cat site.yml
---
- hosts: prod_group
  become: true
  roles:
    - apache2


ansible-playbook site.yml --syntax-check

Ansible Roles

cd /etc/ansible/roles
sudo ansible-galaxy init apache2
cd apache2 && sudo tree apache2

Directory Structure

https://docs.ansible.com/ansible/latest/user_guide/playbooks_reuse_roles.html

ubuntu@ip-172-31-19-63:/etc/ansible/roles$ tree apache2
apache2
├── README.md
├── defaults
│   └── main.yml
├── files
│   ├── apache2.conf
│   └── copy.html
├── handlers
│   └── main.yml
├── meta
│   └── main.yml
├── tasks
│   ├── configure.yml
│   ├── install.yml
│   ├── main.yml
│   └── service.yml
├── templates
├── tests
│   ├── inventory
│   └── test.yml
└── vars
└── main.yml

8 directories, 13 files

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ ls -lrt
total 16
-rw-r--r-- 1 root root 82 Jun 26 11:46 install.yml
-rw-r--r-- 1 root root 79 Jun 26 11:47 service.yml
-rw-r--r-- 1 root root 243 Jun 26 11:58 configure.yml
-rw-r--r-- 1 root root 118 Jun 26 12:02 main.yml

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat main.yml

tasks file for apache2

• include_tasks: install.yml
• include_tasks: configure.yml
• include_tasks: service.yml

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat install.yml

• name: install apache2
  apt: name=apache2 update_cache=yes state=latest

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat configure.yml

#configure apache2.conf and send copy.html file

• name: apache2.conf file
  copy: src=apache2.conf dest=/etc/apache2/
  notify:

  • restart apache2 service

• name: send copy.html file
  copy: src=copy.html dest=/var/www/html/

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/tasks$ cat service.yml

• name: starting apache2 service
  service: name=apache2 state=started

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/files$ ls -lrt
total 12
-rw-r--r-- 1 root root 7224 Jun 26 11:49 apache2.conf
-rw-r--r-- 1 root root 88 Jun 26 11:50 copy.html

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/handlers$ ls -lrt
total 4
-rw-r--r-- 1 root root 108 Jun 26 11:52 main.yml
ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/handlers$ cat main.yml

handlers file for apache2

• name: restart apache2 service
  service: name=apache2 state=restarted

ubuntu@ip-172-31-19-63:/etc/ansible/roles/apache2/meta$ ls -lrt
total 4
-rw-r--r-- 1 root root 1634 Jun 26 11:54 main.yml

ubuntu@ip-172-31-19-63:/etc/ansible$ cat site.yml

• hosts: prod_group
  become: true
  roles:
  • apache2

ansible-playbook site.yml --syntax-check