With this command you can initiate an application restart without touching restart.txt. Unlike touching restart.txt, this tool initiates the restart immediately instead of on the next request. http://blog.phusion.nl/2014/01/02/phusion-passenger-4-0-33-released/ Show archive.org snapshot

If you want to use this with capistrano 2.x just replace the touch command:

-    run "touch #{current_path}/tmp/restart.txt"
+    run "passenger-config restart-app --ignore-app-not-running #{deploy_to}"

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If you are using capistrano 3.x:

 - execute :touch, "#{current_path}/tmp/restart.txt"
 + execute "passenger-config restart-app --ignore-app-not-running #{deploy_to}"

Note: If you using a passenger lower than 5.0.10 you have to use sudo to run this command.

If using it with capistrano you should use passenger >=4.0.41 and the --ignore-app-not-running parameter otherwise your deploy may fail.

When deploying with capistrano it's possible you get this "error" message:

*** [err :: example.com] There are no Phusion Passenger-served applications running whose paths begin with '/var/www/example.com'.
*** [err :: example.com] 

This is just because there were no running passenger instance on the server. It's not a real error.