Add option to detect master/slave status from runtime status

Author: danielkza

defaults/main.yml

@@ -41,6 +41,8 @@ redis_socket_perm: 755
 ## Replication options
 # Set slaveof just as you would in redis.conf. (e.g. "redis01 6379")
 redis_slaveof: false
+# Ignore manually assigned roles for instances if runtime status can be used instead
+redis_runtime_replication_role: yes
 # Make slaves read-only. "yes" or "no"
 redis_slave_read_only: "yes"
 redis_slave_priority: 100

tasks/local_facts.yml

@@ -17,6 +17,7 @@
   vars:
     redis_facts_cli_port: "{{ redis_port }}"
   when: not redis_sentinel
+  register: redis_facts_install_result
 
 - name: create redis sentinel facts
   template:
@@ -27,3 +28,8 @@
     redis_facts_cli_port: "{{ redis_sentinel_port }}"
     redis_facts_sentinel: yes
   when: redis_sentinel
+  register: redis_sentinel_facts_install_result
+
+- name: refresh facts due to new fact scripts
+  setup:
+  when: redis_facts_install_result.changed or redis_sentinel_facts_install_result.changed

tasks/main.yml

@@ -1,6 +1,12 @@
 ---
 - include: check_vars.yml
 
+- include: local_facts.yml
+  when: redis_local_facts|bool
+
+- include: runtime_roles.yml
+  when: not redis_sentinel and redis_runtime_replication_role
+
 - include: install.yml
 
 - include: server.yml
@@ -13,5 +19,3 @@
   tags:
     - config
 
-- include: local_facts.yml
-  when: redis_local_facts|bool

tasks/runtime_roles.yml

@@ -0,0 +1,13 @@
+- name: set redis to slave automatically
+  set_fact:
+    redis_slaveof: >-
+      {{ ansible_local[redis_service_name].master_host }}
+      {{ ansible_local[redis_service_name].master_port }}
+  when: >
+    ansible_local[redis_service_name].role|default() == 'slave'
+
+- name: set redis to master automatically
+  set_fact:
+    redis_slaveof: ~
+  when: >
+    ansible_local[redis_service_name].role|default() == 'master'