Ansible is an open source configuration management, software provisioning and application deployment tool.

• Provisioning new resources

• Configuration management

• Continuous delivery

• Security compliance

• Application deployment

• Orchestration

hostnamectl set-hostname [hostname] 

yum install python3 -y

By default, python3 is the command to run python commands. to use just python, use "alternatives" command. (on Control node and Managed host)

alternatives --set python /usr/bin/python3 python3 --version

yum -y install python3-pip
python --version

Create a new user for ansible administration & grant admin access to the user (on Control node and Managed host)

useradd ansadmin
passwd ansadmin

echo "ansadmin ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers

Using key-based authentication is advised. If you are still at the learning stage use password-based authentication (on Control node and Managed host)

#sed command replaces "PasswordAuthentication no to yes" without editing file 
sed -ie 's/PasswordAuthentication no/PasswordAuthentication yes/' /etc/ssh/sshd_config
sudo service sshd reload
#Install Ansible as a ansadmin user (on Control node)
su - ansadmin
pip3 install ansible --user

Note: Ansible must be installed as a user (here ansadmin)

ansible --version

Log in as a ansadmin user on master and generate ssh key (on Control node)

ssh-keygen
# Copy keys into all ansible managed hosts (on Control node)
ssh-copy-id -i ~/.ssh/id_rsa.pub ansadmin@<target-server>

Validation test Create a directory /etc/ansible and create an inventory file called "hosts" add control node IP address in it.

Run ansible command as ansadmin user it should be successful (Master)

ansible all -m ping