Alternate configuration for Redis

Author: Oumph

INSTALL.md

@@ -250,3 +250,17 @@ To be able to create your first news, you will need to add sections with link
 
 Be sure to set title `LinuxFr.org` to one of your sections, otherwise you won't
 be able to create news in the redaction space.
+
+## Alternative Redis configuration
+
+Default Redis configuration is `redis://localhost:6379`, with database 0 for data
+and database 1 for the cache.
+
+You can override the configuration with the following environment variables:
+
+- `REDIS_URL` for the full address (like `redis://127.0.0.1:6379/0`)
+- `REDIS_CACHE_URL` for the cache full address (like `redis://127.0.0.1:6379/1`)
+
+Warning: the current configuration doesn't support authentication or TLS. Be
+careful with a remote Redis because everything will be exchange in plain text,
+and you exposed your Redis server on the network.

config/environments/alpha.rb

@@ -53,7 +53,7 @@
   config.log_tags = [ :request_id ]
 
   # Use a different cache store in production.
-  config.cache_store = :redis_cache_store, { url: "redis://localhost:6379/1/cache", expires_in: 1.hour }
+  config.cache_store = :redis_cache_store, { url: ENV.fetch("REDIS_CACHE_URL", "redis://localhost:6379/1"), namespace: "cache", expires_in: 1.hour }
 
   config.action_mailer.perform_caching = false
 

config/environments/production.rb

@@ -53,7 +53,7 @@
   config.log_tags = [ :request_id ]
 
   # Use a different cache store in production.
-  config.cache_store = :redis_cache_store, { url: "redis://localhost:6379/1/cache", expires_in: 1.hour }
+  config.cache_store = :redis_cache_store, { url: ENV.fetch("REDIS_CACHE_URL", "redis://localhost:6379/1"), namespace: "cache", expires_in: 1.hour }
 
   config.action_mailer.perform_caching = false