Ansible.md

• Create a Linux Vm on AWS Account

• Search for EC2

• Create one AWS key to login to AWS ec2 instance

• Click on Key Pairs

• Click on Create key

• Give the key and click on create key

• Click on Instances

• Click on Launch Instance

• Give name to vm using named tag

• Select Ubuntu image

• Select Instance type (t2.micro)

• Select previously created key and then click on launch Instance

• Login to Newly created vm

• Copy the public ip address assigned to vm and use below command

ssh -i <pemfile> ubuntu@<public ip address>

• User names for diffrent OS

ec2-user for amazon Linux
ubuntu for ubuntu OS

• After login change the user to root

sudo -s

• Enable Password #PermitRootLogin prohibit-password

sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/g' /etc/ssh/sshd_config
sed -i 's/PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config

systemctl restart sshd

• Set the password for root user

passwd root

enter anny password of your choice

• Test to login to another vm using password and user

ssh root@private ip of another ip

• Update ubuntu OS

apt update

• Install Ansible

apt install ansible 

• Check Ansible version

ansible --version

• Download Ansible config files to /etc/ansible/

mkdir -p /etc/ansible
cd /etc/ansible 
wget https://raw.githubusercontent.com/ansible/ansible/stable-2.9/examples/ansible.cfg

• Start with Local host for test

ansible localhost  -m ping --connection=local

• Create an inventory file

vi /etc/ansible/hosts

[test] 
Ip-address 
:wq

• Test with new vm

ansible test -m ping 

• Add below line to /etc/ansible/ansible.cfg. after [defaults]

vi /etc/ansible/ansible.cfg
host_key_checking = false

• Install sshpass to use password with Ansible

     apt install sshpass
     ansible test -m ping -u root -k
     ANSIBLE_HOST_KEY_CHECKING=False
     ansible test -m ping -u root -k

• Copy some file from one node to another node

ansible test -m copy -a "src=/tmp/new dest=/etc/" -u root -k

• Run linux linux with Ansible

ansible test -m shell -a "ls -a" -u root -k

Tasks for everyone

• Check memory available on all hosts
• Check disk size of all hosts
• check env on all hosts
• Change the permission of a file
• check the size of a file

Start Again

• Install Apache

ansible test -m apt  -a "name=apache2 state=present " -u root -k

• How to get ad hoc command help

ansible-doc <anycommand name>

• start the service

ansible test -m service  -a "name=apache2 state=started" -u root -k

• Create index.html file

vi index.html
Welcome to Ansible Session

• Copy Index.html file to another vm

ansible test -m copy  -a "src=/root/index.html dest=/var/www/html/" -u root -k

• Test Apache in Browser

ip

Playbook Introductionn

• Know Yaml

• Create first playbook

• Install apache2 using playbook given below

---

- hosts: all
  tasks:
  - name: Install Apache2
    apt:
      name: apache2
      state: latest
  - name: check Apache  service status
    service:
      name: apache2
      state: started

• run the above playbook

ansible-playbook  play.yaml  -u root -k

• Check the syntax for Ansible

ansible-playbook  play.yaml  --syntax-check

• Try Dry run

ansible-playbook  play.yaml  -C

• Check all hosts inside a playbook
• Install multiple software in one playbook
• Upgrade OS using Ansible

Variable with Ansible Playbook

• How to define variable in Ansible playbook

- hosts: all
  vars:
     pack: apache2
  tasks:
  - name: Install Apache2
    apt:
      name: "{{ pack }}"
      state: latest
  - name: check Apache  service status
    service:
      name: apache2
      state: started
      
     

Optional if you want to try with ssh key in place of Password

• Create ssh key on Ansible controller

ssh-keygen    press enter twice 

• Send the ssh public to another vm

ssh-copy-id <vm ip>

Now You will be able to rub Ansible commdnds without password .

Happy Learning