Step 1: Launch three Amazon-Linux-2 machines
Step 2: Download and install epel repository
wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm yum install epel-release-7.noarch.rpm –y sudo yum update –y
Step 3: Install ansible along with git, python, python-devel, python-pip, openssl
sudo yum install git python python-devel python-pip openssl ansible –y
Step 4: Go inside ansible.cfg which is under /etc/ansible directory to enable or uncomment the below lines
vi /etc/ansible/ansible.cfg (Press i) inventory = /etc/ansible/hosts (uncomment) sudo_user = root (uncomment) (Press esc) :wq!
Step 5: Ansible inventory
vi /etc/ansible/hosts (Press i) [groupname] machine name OR machine IP (Press esc) :wq!
Step 6: Test environment setup
adduser ansible (in all machines) passwd ansible (in all machines) visudo (Press i) ansible ALL=(ALL) NOPASSWD:ALL (Press esc) :wq!
Step 7: To establish ssh connection among all hosts (do it in all machines)
vi /etc/ssh/sshd_config (Press i) PermitRootLogin yes (uncomment line, set to yes) PasswordAuthentication yes (uncomment line, set to yes) PermitRootLogin no (comment) PasswordAuthentication no (comment) (Press esc) :wq! service sshd restart
su ansible - whoami sudo yum update ssh <node-private-ip> (It prompts for password)
Step 8: Password less authentication (on Ansible Server)
ssh key-gen (can see .ssh/both keys in same directory)
Step 9: Copy the ssh keys to all the nodes (be in a master, be in a .ssh folder, will ask password for the last time)
ssh-copy-id ansible@<node-private-ip>
Step 10: Test ssh connection
ssh <node-private-ip>