Enables RDS support

cookbooks/rds/README.md

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+ey-cloud-recipes/rds
+------------------------------------------------------------------------------
+
+A chef recipe for enabling remote Active Record databases like Amazon's RDS
+
+Dependencies
+--------------------------
+
+Requires a running database instance with firewall access configured for
+your Engine Yard environment.
+
+Contact our support team if you need additional information about your environment.
+
+Enabling this recipe
+---------------------------
+
+* Edit main/recipes/default.rb and comment out the line shown below.
+``require_recipe "rds"``
+* Alter the rds/attributes/rds.rb file to include your connection
+  information.

cookbooks/rds/attributes/rds.rb

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+# place database credentials in this file
+# app_name :adapter => '', :database => '', :username => '', :password => '', :host => ''
+# for example:
+# todo :adapter => 'mysql', :database => 'todoproduction', :username => 'engineyard', :password => 'mypassword', :host => 'todo.dhvg1ytl1sd8.us-east-1.rds.amazonaws.com'

cookbooks/rds/recipes/default.rb

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+#
+# Cookbook Name:: rds
+# Recipe:: default
+#
+# Configure application servers to use an Amazon RDS database (or any external ActiveRecord-compatible database)
+# Note: This recipe does not make any changes to Engine Yard-provisioned databases
+
+if ['solo', 'app_master', 'app', 'util'].include?(node[:instance_role])
+  # for each application
+  node.engineyard.apps.each do |app|
+    # retrieve attributes
+    attributes = node[app.name]
+
+    # skip if there are no attributes for this app
+    next if attributes.nil?
+
+    ey_cloud_report "RDS" do
+      message "RDS - Replacing database.yml for #{app.name}"
+    end
+
+    # create new database.yml with attributes
+    template "/data/#{app.name}/shared/config/database.yml" do
+      owner node[:owner_name]
+      group node[:owner_name]
+      backup false
+      mode 0644
+      source 'database.yml.erb'
+      variables({
+        :environment => node[:environment][:framework_env],
+        :adapter => attributes[:adapter],
+        :database => attributes[:database],
+        :username => attributes[:username],
+        :password => attributes[:password],
+        :host => attributes[:host]
+      })
+    end
+  end
+end

cookbooks/rds/templates/default/database.yml.erb

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+<%= @environment %>:
+  adapter:   <%= @adapter %>
+  database:  '<%= @database %>'
+  username:  '<%= @username %>'
+  password:  '<%= @password %>'
+  host:      '<%= @host %>'
+  reconnect: true