add configs and docs

tasks/main.yml

@@ -2,4 +2,49 @@
   apt:
     pkg:
       - redis
-      
+  register: redis_installed
+
+- name: stop default redis
+  when: redis_installed.changed
+  systemd:
+    name: redis
+    state: stopped
+
+- name: clean up default files
+  when: redis_installed.changed
+  file:
+    path: "{{ item }}"
+    state: absent
+  loop:
+    - "/etc/systemd/system/redis.service"
+    - "/etc/systemd/system/multi-user.target.wants/redis-server.service"
+    - "/etc/redis/redis.conf"
+    - "/var/lib/redis"
+
+- name: deploy redis systemd unit
+  copy:
+    src: redis@.service
+    dest: /etc/systemd/system/redis@.service
+  notify:
+    - systemd daemon reload
+
+- name: deploy redis directories
+  file:
+    path: "/var/lib/redis-{{ item.name }}"
+    state: directory
+    owner: redis
+    group: redis
+    mode: '0750'
+  loop: "{{ redis.instances }}"
+
+- name: configure redis
+  template:
+    src: redis.conf.j2
+    dest: "/etc/redis/redis-{{ item.name }}.conf"
+    owner: redis
+    group: redis
+    mode: 0640
+  loop: "{{ redis.instances }}"
+  register: configs_changed
+  notify:
+    - restart and enable redis