Added variable to selectivley skip entire role if needed.

defaults/main.yml

@@ -1,5 +1,6 @@
 ---
 # Edition can be one of: 'ce' (Community Edition) or 'ee' (Enterprise Edition).
+docker_install: true
 docker_edition: 'ce'
 docker_package: "docker-{{ docker_edition }}"
 docker_package_state: present

tasks/main.yml

@@ -1,15 +1,18 @@
 ---
 - name: OS specific setup
   include: include: "setup-{{ ansible_os_family }}.yml"
+  when: docker_install
 
 - name: Install Docker.
   package: name={{ docker_package }} state={{ docker_package_state }}
+  when: docker_install
 
 - name: Ensure Docker is started and enabled at boot.
   service:
     name: docker
     state: started
     enabled: yes
+  when: docker_install
 
 - include: docker-compose.yml
   when: docker_install_compose