How to install and configure ansible, create playbook and run it on remote servers

Here is a video tutorial

Scripts and configuration files are available here:

Install ansible

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sudo zypper install ansible

Debian

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sudo apt install ansible

Red Hat

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sudo dnf install ansible

Create ansible directory on /etc

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sudo mkdir /etc/ansible

Create hosts file inside the /etc/ansible directory

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sudo vim /etc/ansible/hosts

and put the below content into the file

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servers:
  hosts:
    worker1:
      ansible_host: 10.10.0.3
      ansible_user: ansible 
    worker2:
      ansible_host: 10.10.0.4
      ansible_user: ansible   
    master:
      ansible_host: 10.10.0.2
      ansible_user: ansible

Check ansible version

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ansible --version

Make sure that PasswordAuthentication has set boolean value to yes in /etc/ssh/sshd_config file on remote servers.
Create two playbooks. See examples below:

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vim ssh-session.yaml

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- hosts: servers
  tasks:
  - name: "connect via ssh"
    shell: for i in $(cat servers); do ssh ansible@$i; done

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vim passwd-auth.yaml

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- hosts: servers 
  become: true
  tasks:
  - name: "replace on sshd_config"
    shell: sed -i 's/PasswordAuthentication yes/PasswordAuthentication no/g' /etc/ssh/sshd_config
  - name: "Restart ssh"
    shell: systemctl restart sshd

Run these playbooks like below:

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ansible-playbook ssh-session.yaml
ansible-playbook passwd-auth.yaml
ansible-playbook ssh-session.yaml