docker_swarm: Add support for default_addr_pool and subnet_size (#54642)

* Add support for default_addr_pool and subnet_size

* Add changelog fragment

* Document options only used on init / join

changelogs/fragments/54642-docker_swarm-remote_addr_pool.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - "docker_swarm - Added support for ``default_addr_pool`` and ``subnet_size``."

lib/ansible/modules/cloud/docker/docker_swarm.py

@@ -29,7 +29,25 @@ options:
           the port number from the listen address is used.
       - If C(advertise_addr) is not specified, it will be automatically
           detected when possible.
+      - Only used when swarm is initialised or joined. Because of this it's not
+        considered for idempotency checking.
     type: str
+  default_addr_pool:
+    description:
+      - Default address pool in CIDR format.
+      - Only used when swarm is initialised. Because of this it's not considered
+        for idempotency checking.
+      - Requires API version >= 1.39.
+    type: list
+    version_added: "2.8"
+  subnet_size:
+    description:
+      - Default address pool subnet mask length.
+      - Only used when swarm is initialised. Because of this it's not considered
+        for idempotency checking.
+      - Requires API version >= 1.39.
+    type: int
+    version_added: "2.8"
   listen_addr:
     description:
       - Listen address used for inter-manager communication.
@@ -38,6 +56,8 @@ options:
           like C(eth0:4567).
       - If the port number is omitted, the default swarm listening port
           is used.
+      - Only used when swarm is initialised or joined. Because of this it's not
+        considered for idempotency checking.
     type: str
     default: 0.0.0.0:2377
   force:
@@ -283,6 +303,8 @@ class TaskParameters(DockerBaseClass):
         self.autolock_managers = None
         self.rotate_worker_token = None
         self.rotate_manager_token = None
+        self.default_addr_pool = None
+        self.subnet_size = None
 
     @staticmethod
     def from_ansible_params(client):
@@ -366,7 +388,8 @@ class TaskParameters(DockerBaseClass):
     def compare_to_active(self, other, client, differences):
         for k in self.__dict__:
             if k in ('advertise_addr', 'listen_addr', 'remote_addrs', 'join_token',
-                     'rotate_worker_token', 'rotate_manager_token', 'spec'):
+                     'rotate_worker_token', 'rotate_manager_token', 'spec',
+                     'default_addr_pool', 'subnet_size'):
                 continue
             if not client.option_minimal_versions[k]['supported']:
                 continue
@@ -438,10 +461,18 @@ class SwarmManager(DockerBaseClass):
             return
 
         if not self.check_mode:
+            init_arguments = {
+                'advertise_addr': self.parameters.advertise_addr,
+                'listen_addr': self.parameters.listen_addr,
+                'force_new_cluster': self.force,
+                'swarm_spec': self.parameters.spec,
+            }
+            if self.parameters.default_addr_pool is not None:
+                init_arguments['default_addr_pool'] = self.parameters.default_addr_pool
+            if self.parameters.subnet_size is not None:
+                init_arguments['subnet_size'] = self.parameters.subnet_size
             try:
-                self.client.init_swarm(
+                self.client.init_swarm(**init_arguments)
-                    advertise_addr=self.parameters.advertise_addr, listen_addr=self.parameters.listen_addr,
-                    force_new_cluster=self.force, swarm_spec=self.parameters.spec)
             except APIError as exc:
                 self.client.fail("Can not create a new Swarm Cluster: %s" % to_native(exc))
 
@@ -559,7 +590,9 @@ def main():
         autolock_managers=dict(type='bool'),
         node_id=dict(type='str'),
         rotate_worker_token=dict(type='bool', default=False),
-        rotate_manager_token=dict(type='bool', default=False)
+        rotate_manager_token=dict(type='bool', default=False),
+        default_addr_pool=dict(type='list', elements='str'),
+        subnet_size=dict(type='int'),
     )
 
     required_if = [
@@ -579,6 +612,8 @@ def main():
             detect_usage=_detect_remove_operation,
             usage_msg='remove swarm nodes'
         ),
+        default_addr_pool=dict(docker_py_version='4.0.0', docker_api_version='1.39'),
+        subnet_size=dict(docker_py_version='4.0.0', docker_api_version='1.39'),
     )
 
     client = AnsibleDockerSwarmClient(

test/integration/targets/docker_swarm/tasks/tests/remote-addr-pool.yml

@@ -0,0 +1,93 @@
+---
+
+- name: Remove Swarm cluster
+  docker_swarm:
+    state: absent
+    force: true
+  diff: yes
+  register: output_2
+
+####################################################################
+## default_addr_pool ###############################################
+####################################################################
+
+- name: default_addr_pool
+  docker_swarm:
+    state: present
+    default_addr_pool:
+      - "2.0.0.0/16"
+  diff: yes
+  register: output_1
+  ignore_errors: yes
+
+- name: default_addr_pool (idempotent)
+  docker_swarm:
+    state: present
+    default_addr_pool:
+      - "2.0.0.0/16"
+  diff: yes
+  register: output_2
+  ignore_errors: yes
+
+- name: cleanup
+  docker_swarm:
+    state: absent
+    force: true
+  diff: no
+
+- name: assert default_addr_pool
+  assert:
+    that:
+       - 'output_1 is changed'
+       - 'output_2 is not changed'
+       - 'output_2.swarm_facts.DefaultAddrPool == ["2.0.0.0/16"]'
+  when: docker_api_version is version('1.39', '>=') and docker_py_version is version('4.0.0', '>=')
+
+- name: assert default_addr_pool failed when unsupported
+  assert:
+    that:
+    - 'output_1 is failed'
+    - "'Minimum version required' in output_1.msg"
+  when: docker_api_version is version('1.39', '<') or docker_py_version is version('4.0.0', '<')
+
+####################################################################
+## subnet_size #####################################################
+####################################################################
+
+- name: subnet_size
+  docker_swarm:
+    state: present
+    force: yes
+    subnet_size: 26
+  diff: yes
+  register: output_1
+  ignore_errors: yes
+
+- name: subnet_size (idempotent)
+  docker_swarm:
+    state: present
+    subnet_size: 26
+  diff: yes
+  register: output_2
+  ignore_errors: yes
+
+- name: assert subnet_size
+  assert:
+    that:
+       - 'output_1 is changed'
+       - 'output_2 is not changed'
+       - 'output_2.swarm_facts.SubnetSize == 26'
+  when: docker_api_version is version('1.39', '>=') and docker_py_version is version('4.0.0', '>=')
+
+- name: cleanup
+  docker_swarm:
+    state: absent
+    force: true
+  diff: no
+
+- name: assert subnet_size failed when unsupported
+  assert:
+    that:
+    - output_1 is failed
+    - "'Minimum version required' in output_1.msg"
+  when: docker_api_version is version('1.39', '<') or docker_py_version is version('4.0.0', '<')