Update playbook to initialize an actual swarm (and join worker nodes)

play.yml

@@ -1,16 +1,18 @@
 ---
 
+#
+# 1. Apply docker-engine role to all hosts
+#
+
 - hosts: all
 
   pre_tasks:
 
   - name: Check that a proper ipv4 network is specified
     assert:
-      that: (network is defined) and (network | ipaddr("network"))
-
-  - name: Check primary ipv4 address falls into specified network
-    assert:
-      that: (ipv4_address is defined) and (ipv4_address | ipaddr(network))
+      that: 
+      - (network is defined) and (network | ipaddr("network"))
+      - (ipv4_address is defined) and (ipv4_address | ipaddr(network))
 
   - set_fact:
       primary_ipv4_address: "{{ansible_all_ipv4_addresses| ipaddr(network)| first}}"
@@ -37,6 +39,7 @@
   tasks:
 
   - debug: var=play_hosts
+
   #- debug: var=network
   #- debug: var=hostname
 
@@ -51,3 +54,41 @@
       insertafter: '^127\.0\.1\.1 .*'
     with_items: '{{play_hosts}}'
     sudo: yes
+
+
+#
+# 2. Initialize manager as a swarm manager node
+#
+
+- hosts: manager
+
+  tasks:
+
+  - name: Initialize swarm mode
+    shell: docker swarm init --advertise-addr {{primary_ipv4_address}}
+
+  - name: Get swarm token for joining a worker node
+    shell: docker swarm join-token -q worker
+    register: swarm_join_token_result
+
+  - set_fact:
+      swarm_join_token: '{{swarm_join_token_result.stdout}}'
+
+  - debug:
+      msg: The join token is {{swarm_join_token}}
+
+#
+# 3. Join worker nodes into swarm
+#
+
+- hosts: workers
+
+  tasks:
+
+  - set_fact:
+      swarm_join_token: '{{hostvars["manager"].swarm_join_token}}'
+      swarm_manager_address: '{{hostvars["manager"].primary_ipv4_address}}'
+
+  - name: Join into swarm
+    shell: docker swarm join --token "{{swarm_join_token}}" "{{swarm_manager_address}}:2377" 
+