Ansible Learning Notes

DAY1

What is Ansible
---------------------------------
	Deployment tool
	Config mgmt tool

	tool	
		save cost
		save time
		imp qual
	mgmt
		SERVER(S)
	Config
		Config of Server

		file
		dir
		user
		apt
		yum
		services
		bash
		
	Python
	Release
		ansible - cmd
		tower - web 
		awx - web
	from Redhat

Why Ansible?
		platform inde*
		Ability to run Script parr* in 1000 of server(S)
		IDEOMPOTENT 
		Easy 
			to read
			write
			debug
			share
			learn

Others 
	Chef puppet ansible salt cfegine
====================================================================

How to Works? Arch*
==========================================================


Human --> ACS --------> ARS(S)
========================================================
	 linux		Any
	 
	 Ansible	NA

	 	--------- Linux -- SSH
		--------- Windows -- Winrm / HTTP

	python3		Linux - python
			win - dotnet + ps3

54.89.178.94	
Components of Ansible
--------------------------------
Ansible
	Executable(S)
	Modules - Python code --> RUN IN ARS - Copy delete apt script
			https://docs.ansible.com/ansible/2.9/modules/modules_by_category.html
			https://docs.ansible.com/ansible/2.9/modules/list_of_all_modules.html
	Plugins	- Python code --> RUN IN ACS - Adding extra fea of Ansible
	Configfile - /etc/ansible/ansible.cfg
			https://gist.github.com/alivx/2a4ca3e577ead4bd38d247c258e6513b

Inventory | hostfile
	file 
		contains IPAdd(s) of ARS
		
		10.1.1.1
		10.22.2.2
		222.33.3.3
		4.5.5.5
		
		group - all(built-in)

		[web]
		10.1.1.1
		10.22.2.2
		[db]
		222.33.3.3
		4.5.5.5

playbook
	yaml file
	contains play

	play
		hosts: GROUP of Inventory | all | web | db
		tasks:
			- module copy n Its param
			- module apt n Its param
			- module service n Its param

ansible-playbook -i inventory web.yaml
	
============================================================
ADHOC
---------------
Project
write a ansible automation to deploy webserver.

Step 1 - Find out ARS is linux or windows-- linux | ubuntu | apache
Step 2 - find a module which would install apache in ubuntu		- apt
- https://docs.ansible.com/ansible/latest/collections/ansible/builtin/apt_module.html
Step 3 - find a module which copy software into /var/lib/www/		- copy
- https://docs.ansible.com/ansible/latest/collections/ansible/builtin/copy_module.html
Step 4 - find a module which which would start apache services		- services
- https://docs.ansible.com/ansible/latest/collections/ansible/builtin/service_module.html


ansible localhost -m apt -a"name=apache2 state=latest"
ansible localhost -m copy -a"src=index.html dest=/var/www/html"
ansible localhost -m service -a"name=apache2 state=started"



[web]
54.89.178.94
34.239.106.240
10.1.1.1
10.22.2.2
		
[db]
222.33.3.3
4.5.5.5



ansible web -i inventory -m apt -a"name=apache2 state=latest"
ansible web -i inventory -m copy -a"src=index.html dest=/var/www/html"
ansible web -i inventory -m service -a"name=apache2 state=started"



root@ip-172-31-87-83:~# ansible web -i inventory -m apt -a"name=apache2 state=latest"
The authenticity of host '54.89.178.94 (54.89.178.94)' can't be established.
ED25519 key fingerprint is SHA256:/bb5HKInMiqK9Gg4+HAIpXvL1so/gMPk5YXHBOw7960.
This key is not known by any other names
The authenticity of host '34.239.106.240 (34.239.106.240)' can't be established.
ED25519 key fingerprint is SHA256:n1JRfvbTbzn5irTGzoH9UOVp0gAPLz+IyxsR55PsiSk.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
54.89.178.94 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: Warning: Permanently added '54.89.178.94' (ED25519) to the list of known hosts.\r\nroot@54.89.178.94: Permission denied (publickey).",
    "unreachable": true
}
10.1.1.1 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: ssh: connect to host 10.1.1.1 port 22: Connection timed out",
    "unreachable": true
}
10.22.2.2 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: ssh: connect to host 10.22.2.2 port 22: Connection timed out",
    "unreachable": true
}

34.239.106.240 | UNREACHABLE! => {
    "changed": false,
    "msg": "Failed to connect to the host via ssh: Host key verification failed.",
    "unreachable": true



ansible web -i inventory -m apt -a"name=apache2 state=latest" -u ubuntu --key-file=node.pem -b
ansible web -i inventory -m copy -a"src=index.html dest=/var/www/html" -u ubuntu --key-file=node.pem -b
ansible web -i inventory -m service -a"name=apache2 state=started" -u ubuntu --key-file=node.pem -b







	

Day 2

=======================================================
PLAYBOOK

playbook
	yaml file
	contains play

	play
		hosts: GROUP of Inventory | all | web | db
		tasks:
			- module copy n Its param
			- module apt n Its param
			- module service n Its param


---
- name: Update web servers
  hosts: web

  tasks:
  - name: Install Apache in ubuntu
    ansible.builtin.apt:
      name: "apache2"
      state: latest
  - name: Copy index.html
    ansible.builtin.copy:
      src: index.html
      dest: /var/www/html/index.html
  - name: Starting a Apache Server
    ansible.builtin.service:
      name: "apache2"
      state: started
  - name: Print return information from the previous task
    ansible.builtin.debug:
      msg: "Hello Everyone"

ansible-playbook -i inventory web.yaml -u ubuntu --key-file=node.pem -b