Ansible

Ansible installation in amazon linux2 machine:

• sudo amazon-linux-extras install ansible2
• ansible --version    (ansible 2.9.23)
• config file = /etc/ansible/ansible.cfg
•  ansible.cfg -----------------------Default configuration related file.
•  hosts ------------------------------Host inventory file   
• roles 
• python --version   (python 2.7.18)

Create ansible master-node:

• install ansible
• Create a user ------------------------(ansibleuser)
• Allocate password to him
• Visudo
• Ansible-user           ALL=(ALL)       NOPASSWD: ALL
• /etc/sshd/sshd_config
• Change Password_Authentication
• service sshd restart
• Login an a ansible user ------------- (ansibleuser)
• ssj-keygen
• id_rsa
• id_rsa.pub

Create a ansible worker-node:

• Create a user ------------------------(ansibleuser)
• Allocate password to him
• Visudo
• ansible-user           ALL=(ALL)       NOPASSWD: ALL
• /etc/sshd/sshd_config
• Change Password_Authentication
• service sshd restart
• Login an a ansible user ------------- (ansibleuser)

Create a User:

• useradd ansible-user
• passwd ansible-user
• visudo
• #allow root to run any commands anywhere
• Ansible-user            ALL=(ALL)  NOPASSWD: ALL
• :wq!  (write + quit + exit)

Password_Authentication:

• /etc/ssh
• vi sshd_config
• password Authentication Yes --------------------(by default is will be “NO”)
• service sshd restart

Generate ssh Keypair:

• The keypair is a combination of private key & private key.
• Private Key + public Key.
• ssh-keygen-------------------------Pvt (List) + pub (Card)
• goto
• /home/ansible-user/.sshd
• id_rsa
• id_rsa.pub
• .
• ssh-copy-id-------------------------Share public key
• ssh-copy-id  ansibleuser@172.31.38.25
• enter password
• after conned the target server
• ssh ‘ansibleuser@172.31.38.25’
• exit

Ansible commands:

• ansible -m ping all