Example Ansible playbook

harmless-playbook.yaml

---
- name: Ensure vim on localhost1
  hosts: localhost1
  remote_user: root

  tasks:
  - name: Ensure vim-minimal is installed
    ansible.builtin.yum:
      name: vim-minimal
      state: latest
  - name: Ensure vim-enhanced is installed
    ansible.builtin.yum:
      name: vim-enhanced
      state: latest

- name: Ensure vim on localhost2
  hosts: localhost2
  remote_user: root

  tasks:
  - name: Ensure vim-minimal is installed
    ansible.builtin.yum:
      name: vim-minimal
      state: latest
  - name: Ensure vim-enhanced is installed
    ansible.builtin.yum:
      name: vim-enhanced
      state: latest

- name: Ensure vim on localhost1 and 2
  hosts:
    - localhost1
    - localhost2
  remote_user: root

  tasks:
  - name: Ensure vim-minimal is installed
    ansible.builtin.yum:
      name: vim-minimal
      state: latest
  - name: Ensure vim-enhanced is installed
    ansible.builtin.yum:
      name: vim-enhanced
      state: latest

instructions.md

Create inventory entries for two hosts:

cat /etc/ansible/hosts
localhost1
localhost2

Make sure both localhost1 and localhost2 resolve to 127.0.0.1:

cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 localhost1 localhost2

Generate SSH key, if you don't have any:

ssh-keygen

Connect to both and accept key fingerprint and install the key:

ssh-copy-id root@localhost1
ssh-copy-id root@localhost2

Finally, run the Ansible playbook:

ansible-playbook harmless-playbook.yaml

When using Foreman with Ansible plugin, do this:

ANSIBLE_CONFIG=/etc/foreman-proxy/ansible.cfg ANSIBLE_LOAD_CALLBACK_PLUGINS=1 ansible-playbook harmless-playbook.yaml