main.yaml

---
  - hosts: all
    become: yes
    roles:
#      - { role: snapcreate, when: ( ansible_distribution == "Ubuntu" ) or
#                                  ( ansible_distribution == "Debian" ) or
#                                  ( ansible_distribution == "CentOS" ) or
#                                  ( ansible_distribution == "Amazon" ) or
#                                  ( ansible_distribution == "RedHat" ) }
      - { role: apt_update, when: ( inventory_hostname != "localhost") and ( ansible_distribution == "Ubuntu" ) or
                                  ( ansible_distribution == "Debian" ) }
      - { role: yum_update, when: ( inventory_hostname != "localhost") and ( ansible_distribution == "CentOS" ) or
                                  ( ansible_distribution == "Amazon" ) or
                                  ( ansible_distribution == "RedHat" ) }
      #- { role: logoff, when: ( 'localhost' in inventory_hostname ) }
    vars:
      reboot_ok: true

#ansible_hostname != "testicle"
# How to run
# ansible-playbook -b -u <user> --private-key <path to key> -i hosts -l <host-group> main.yml [--extra-vars reboot_ok=true]