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Add note about asset pipeline and CDNs.

Fixes #2468.
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1 parent 4d61d1f commit e85cb2d3bb95ae5cf2f524ffc6828fd40723c83e @steveklabnik steveklabnik committed Nov 9, 2012
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@@ -575,6 +575,17 @@ group :production do
+### CDNs
+If your assets are being served by a CDN, ensure they don't stick around in
+your cache forever. This can cause problems. If you use
+`config.action_controller.perform_caching = true`, Rack::Cache will use
+`Rails.cache` to store assets. This can cause your cache to fill up quickly.
+Every CDN is different, so evaluate how your CDN handles caching and make sure
+that it plays nicely with the pipeline; you may find quirks related to your
+specific set up.
Customizing the Pipeline

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