Ansible is a free and open source automation tool that allows system administrators to configure and control hundreds of nodes from a central server without the need of installing any agents on the nodes.
It relies on the SSH protocol to communicate with the remote nodes. Compared to other management tools such as Puppet and Chef, Ansible comes out as the favorite due to its ease of use, and installation.
Step 1: Installing Python3
Usually, RHEL 8 and CentOS 8 will come with Python3 already installed by default. However, If for whatever reason Python3 is not installed, install it using the following dnf commands. Make sure you must log in as normal user with sudo privileges.
su - aeterno sudo dnf update sudo dnf install python3
To verify that indeed you have python3 installed, run the command.
Step 2: Installing PIP – The Python Package Installer
Pip is a Python’s package manager, which is also comes preinstalled, but again, in case Pip is missing on your system, install it using the command.
sudo dnf install python3-pip
Step 3: Installing the Ansible Automation Tool
With all the prerequisites met, install ansible by running the command.
pip3 install ansible --user
To check the version of Ansible, run.
Step 4: Testing the Ansible Automation Tool
To test ansible, first ensure that ssh is up and running.
sudo systemctl status sshd
Next, we need to create the
hosts file in the /etc/ansible directory to define host machines.
sudo mkdir /etc/ansible cd /etc/ansible sudo touch hosts
hosts the file will be the inventory where you will have all your remote nodes.
hosts file with your favorite editor and define the remote node as shown.
Next, generate SSH keys from which we will copy the public key to the remote node.
To copy the generated SSH key to the remote node run the command.
ssh-copy-id [email protected]
Now use Ansible to ping the remote node as shown.
ansible -i /etc/ansible/hosts web -m ping