example-site.yaml

- name: "All Hosts have a standard set of tools and configuration"
  hosts: all
  become: true
  roles:
  - role: common

# These examples show various ways to assign roles to hosts
#
# In this first one, the inventory is one host group "swarm" and ansible decides which
# of three roles to apply to each host by the value of its vars
# pros:
# - fewer host groups
# cons:
# - too complicated
# - many roles
# - roles are mostly empty
# - order of execution determined by order of hosts in inventory
#- hosts: swarm
#  roles:
#  - role: primary_swarm_manager
#    when: swarm_manager is defined and swarm_manager and initializes_swarm is defined and initializes_swarm
#  - role: swarm_manager
#    when: swarm_manager is defined and swarm_manager and initializes_swarm is not defined or not initializes_swarm
#  - role: swarm_node
#    when: swarm_manager is not defined or not swarm_manager
#
# In this second the inventory is separate host groups for managers and workers and
# ansible applies the same role to all hosts, but each group with different role parameters
# pros:
# - expressive
# - fewer roles
# - single role handles all node types
# - order of execution is explicitly the order shown here
# cons:
# - more host groups
- hosts: primary_swarm_managers
  roles:
  - { role: docker_swarm, id: "{{ swarm_id }}", manager: true, initialise: true }

- hosts: swarm_managers
  become: true
  roles:
  - { role: docker_swarm, id: "{{ swarm_id }}", manager: true }

- hosts: swarm_nodes
  become: true
  roles:
  - { role: docker_swarm, id: "{{ swarm_id }}", manager: false }
#
# In this third the inventory is one host group and ansible applies the same role to all hosts
# and passes values of each hosts vars as role parameters
# pros:
# - fewer host groups
# - fewer roles
# - single role handles all node types
# cons:
# - order of execution determined by order of hosts in inventory
#- hosts: swarm
#  roles:
#  - role: docker_swarm
#    manager: swarm_manager is defined and swarm_manager
#    initialise: initializes_swarm is defined and initializes_swarm