Ansible setup with root user

you might know the required installation packages to use ansible.

After installation is done follow below steps:

• Login as a root user

    sudo -i
  

• create a password for root.

    passwd root
  

• root user have all permissions by-default so we dont need to edit visudo.

• edit the sshd_config under /etc/ssh/sshd_config

• Navigate to the 63rd line of the file and modify 'PasswordAuthentication yes'.

• Navigate to the 38th line of the file and uncomment "PermitRootLogin yes" to login root.

    vim /etc/ssh/sshd_config
  
    63. PasswordAuthentication yes
    38. PermitRootLogin yes
  

• Restart sshd

    [root@ip-172-31-80-244 ~] systemctl restart sshd
  

  I've created two more instances as slaves here.

  Slave-1 - 54.86.33.245

• Slave-2 - 54.87.131.102

• Perform the same steps on all the slaves, but omit the installation step.

To establish an SSH connection between the master and slaves, we need a PEM file. However, I do not have one.

Instead, we can generate an SSH key pair on the master server and copy the public key to the slaves.

Visit this link . --> do required operation in root user.

• by-default inventory is commented so the host's file is not get executed so we have to uncomment it.

• Uncomment the inventory in the Ansible configuration file located at /etc/ansible.

    vim /etc/ansible/ansible.cfg
    #inventory = /etc/ansible/hosts
  

• Add slaves in the hosts file located at /etc/ansible

    vim /etc/ansible/hosts
  
    [slave-1]
    54.86.33.245
  
    [slave-2]
    54.87.131.102
  

  Playbooks

• we are creating a playbook file one.yaml.

• but we are not using "user" and "become" under the target's section, because we using ansible with the root user so we don't need to add them.

• action can be performed in various ways:

  • action: yum name=<<package_Name>> state=present/absent/latest

  • yum: name=<<package_Name>> state=present/absent/latest

  • command: --> we can directly execute command

      ---
      - hosts: slave-1
        connection: ssh
    
        tasks:
          - name: installing tree in slave-1
            action: yum name=tree state=present
      ...
      ~
    

      ---
      - hosts: slave-1
        connection: ssh
    
        tasks:
          - name: installing tree in slave-1
            yum: name=tree state=present
      ...
    

      ---
      - hosts: slave-1
        connection: ssh
    
        tasks:
          - name: installing tree in slave-1
            yum:
              name: tree
              state: present
      ...
    

      ---
      - hosts: all
        connection: ssh
    
        tasks:
          - name: installing tree in slave-1
            command: yum remove tree -y
      ...