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# Configuration examples so that one can do a hot deploy to production # Assumes you are running Nginx, Unicorn and Capistrano # Assumes environment uses RVM and Bundler # Written by Adam Medeiros (adamthedeveloper) # Here is an example of how to do the hot deploy. To understand what's happening, please open up # nginx.conf and search for "upstream" - you'll see that traffic to nginx will be directed to the # new cluster of unicorn workers if the reroute.txt file exists. Then, we kill the original cluster - so # the steps are: # 1. Pull code from the repo # 2. Fire up a new cluster of unicorns on a different port and/or different socket name # 3. Create a reroute.txt file in the public/system folder or location of choice # 4. Nginx sees reroute.txt and forwards all requests to the new cluster of unicorns running new code # 5. Shut down old cluster # 6. Bring up new cluster with the original, permanent settings # 7. remove the reroute.txt file # 8. kill the temporary cluster created in step 2. # DESIRED RESULTS # There shouldn't have been an interruption in the visitors experience and we are now running the new code # NOTE: One could also set this up so that the reroute.txt is called either 8080_reroute.txt or 9090_reroute.txt # and nginx can be configured to route traffic to the appropriate socket depending on the reroute file - this would # make it so that you just fire up a new cluster of unicorns and switch to the new one and bring down the old one - # back and forth each time there is a deploy. Less steps. # cap deploy:hot