<% unless @db_root_password.nil? %>
DB_ROOT_PASSWORD=<%= @db_root_password %>
<% end %>
+<% unless @s3_access_key_id.nil? %>
+S3_ACCESS_KEY_ID=<%= @s3_access_key_id %>
+<% end %>
+<% unless @s3_access_key_secret.nil? %>
+S3_ACCESS_KEY_SECRET=<%= @s3_access_key_secret %>
+<% end %>