group_vars.test.yml

## group_vars.test.yml
# group_vars/test.yml
# This file contains the variables needed for the [test] host group
---
ruby_reinstall_from_source: false
ruby_version: 2.3.0
ruby_sha256sum: ba5ba60e5f1aa21b4ef8e9bf35b9ddb57286cb546aac4b5a28c71f459467e507

## playbook.yml
# playbook.yml
# This file is the main build configuration
---
- name: "Test Playbook" # The name of the playbook
  hosts: test           # The servers in this host group will be affected
  remote_user: ubuntu   # The user we are going to log in as
  become_method: sudo   # The method we will become another user via

  roles:
    - ruby

## roles.ruby.tasks.main.yml
# roles/ruby/tasks/main.yml
# This file contains all the tasks that will be run for the ruby play
---
- name: install required packages
  become: true
  apt: name={{item}} state=present update_cache=yes
  with_items:
    - build-essential
    - cmake
    - zlib1g-dev
    - libyaml-dev
    - libncurses-dev
    - libssl-dev
    - libreadline-dev

- name: Get installed version
  command: ruby --version
  ignore_errors: True
  changed_when: false
  failed_when: false
  register: ruby_installed_version

- name: Force install if the version numbers do not match
  set_fact:
    ruby_reinstall_from_source: true
  when: '(ruby_installed_version|success and (ruby_installed_version.stdout | regex_replace("^.*?([0-9\.]+).*$", "\\1") | version_compare(ruby_version, operator="!=")))'

- when: ruby_installed_version|failed or ruby_reinstall_from_source
  block:
    - name: Download Ruby
      get_url:
        url: "https://cache.ruby-lang.org/pub/ruby/2.3/ruby-{{ruby_version}}.tar.gz"
        dest: "/tmp/ruby-{{ruby_version}}.tar.gz"
        sha256sum: "{{ruby_sha256sum}}"

    - name: Extract archive
      unarchive:
        src: "/tmp/ruby-{{ruby_version}}.tar.gz"
        dest: /tmp/
        creates: "/tmp/ruby-{{ruby_version}}/README.md"
        copy: false

    - name: Configure install
      command: ./configure --disable-install-doc
      args:
        chdir: "/tmp/ruby-{{ruby_version}}"
        creates: "/tmp/ruby-{{ruby_version}}/config.status"

    - name: Build ruby
      command: make
      args:
        chdir: "/tmp/ruby-{{ruby_version}}"
        creates: "/tmp/ruby-{{ruby_version}}/ruby"

    - name: Install ruby
      become: true
      command: make install
      args:
        chdir: "/tmp/ruby-{{ruby_version}}"
        creates: /usr/local/bin/ruby

    - name: Remove build directory
      file:
        path: "/tmp/ruby-{{ruby_version}}"
        state: absent

    - name: Remove archive
      file:
        path: "/tmp/ruby-{{ruby_version}}.tar.gz"
        state: absent

## servers
[test]
ec2-127-0-0-1.eu-west-1.compute.amazonaws.com