Added support for using Debian/Ubuntu backports repository.

To use the backports repository, user has to set variable:
'redis_debian_backports' to 'True'.

Author: tjanez

defaults/main.yml

@@ -1,5 +1,14 @@
 ---
 
+######################
+# Playbook variables #
+######################
+# Whether to use Debian/Ubuntu backports repository when installing Redis
+redis_debian_backports: False
+
+###################
+# Redis variables #
+###################
 redis_bind_address: "0.0.0.0"
 redis_port: 6379
 redis_syslog_enabled: "yes"

tasks/main.yml

@@ -19,7 +19,11 @@
   when: ansible_os_family == "RedHat"
 
 - name: Install the Redis packages 
-  apt: name={{ item }} state=present update_cache=yes
+  apt:
+    name: "{{ item }}"
+    state: present
+    update_cache: yes
+    default_release: "{{ ansible_distribution_release + '-backports' if redis_debian_backports else ansible_distribution_release }}"
   with_items: redis_ubuntu_pkg
   environment: env
   when: ansible_os_family == "Debian"