Create the ansible user on each server in the hosts file.

• Ubuntu 18.04 / 16.04 as a client. It should work on older versions of Ubuntu/Debian based systems.
• CentOS 7.3
• CentOS 6.5
• CentOS 5.9

vi .gitignore
#Insert the following lines
.vaultpass
.retry

• default_sudo_nopass: yes|no (default yes). yes = passwordless sudo.

---
- hosts: '{{inventory}}'
  become: yes
  roles:
  - create-user-ansible

• install ansible
• create keys
• ssh to client to add entry to known_hosts file
• configure client server authorized_keys
• run ansible commands

Create initial ansible user, using an existing user

• username: new ansible user to be created
• ansible_ssh_user: existing user with ssh access
• --become-method: su|sudo
• --ask-become-pass: needed if using su or password for sudo
• inventory: servers from hosts file
• default_sudo_nopass: passwordless sudo

Passwordless sudo = true (don't prompt for user password when running playbook)

ansible-playbook create-user-ansible.yml --ask-pass --become --become-method=su --ask-become-pass --extra-vars "inventory=all-dev ansible_ssh_user=username123 username=ansible" -i hosts

Passwordless sudo = false (prompt for user password when running playbook)

ansible-playbook create-user-ansible.yml --ask-pass --become --become-method=su --ask-become-pass --extra-vars "inventory=all-dev default_sudo_nopass=false ansible_ssh_user=username123 username=ansible" -i hosts

RHEL5 has a dependency that needs to be installed: python-simplejson
This command will use the raw module to install it:

ansible centos5 -m raw -a "yum install -y python-simplejson" --become --ask-pass --become-method=su --ask-become-pass --extra-vars="ansible_ssh_user=username123" -i hosts-dev

If SELinux is enabled/permissive a dependency is needed: libselinux-python
This command will use the raw module to install it:

ansible centos5 -m raw -a "yum install -y libselinux-python" --become --ask-pass --become-method=su --ask-become-pass --extra-vars="ansible_ssh_user=username123" -i hosts-dev