running an Ansible playbook against a single host

Question:

I’m using a hosts file for static inventory:

server1 ansible_ssh_host=1.1.1.1
server2 ansible_ssh_host=1.1.1.2
server3 ansible_ssh_host=1.1.1.3

[group1]
server1
server2

server1 ansible_ssh_host=1.1.1.1

server2 ansible_ssh_host=1.1.1.2

server3 ansible_ssh_host=1.1.1.3

[group1]

server1

server2

And I’ve got a playbook example.yml like this:

---
- name: base setup
  become: true
  hosts:
    - group1
  roles:
    - base

---

- name: base setup

become: true

hosts:

- group1

roles:

- base

I’d like to an ansible-playbook test run using example.yml, but only against the host server1. Is there a way of doing this?

Well I finished writing this question, then my SO search-fu improved. Here are some answers:

Using -l SUBSET:

Using -i "hostname,":