Pushing an App with Multiple Processes (Beta)
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This topic describes how to push and manage apps with multiple processes.
Note: This is a beta feature. Because the CLI may change, this feature is not recommended for use in scripts until it is generally available.
The CAPI v3 API introduces the concept of processes as runnable units of an app. This new resource supports apps that run in multiple modes using the same codebase, such as a web app that has a web UI process and a worker process.
Previously, you had to push two separate apps for a web UI and worker process. Now you can push them as part of the same app using a Procfile. See Push an App with Multiple Processes.
For more information about processes, see the Processes section of the CAPI v3 documentation.
You can push an app with multiple processes using a Procfile. Follow the procedure below.
Note: You can also push an app with multiple processes using an app manifest. See The app manifest specification in the CAPI v3 docs.
- Create a file named
Procfilein the root of your app directory.
Note For more information about Procfiles, see the Procfiles section of the CAPI v3 documentation.
Add each process and its start command to the Procfile. See the following example:
web: bundle exec rackup config.ru -p $PORT worker: bundle exec rake worker:start
cf v3-push myapp
By default, the web process has a route and one instance. Other processes have zero instances by default.
To scale an app process, run the following command:
cf v3-scale APP-NAME --process PROCESS-NAME -i INSTANCE-COUNT
To view the processes running as part of an app, run
cf APP-NAME. See the following example in which the app has a
web and a
$ cf app myapp Showing health and status for app myapp in org test / space test as admin... name: myapp requested state: started processes: web:1/1, worker:2/2 memory usage: 256M x 1, 256M x 2 routes: myapp.cloudfoundry.example.com stack: cflinuxfs2 buildpacks: ruby web:1/1 state since cpu memory disk #0 running 2017-09-25 15:43:26 PM 0.2% 18.9M of 256M 84.4M of 1G worker:2/2 state since cpu memory disk #0 running 2017-09-25 15:49:46 PM 0.1% 5M of 256M 73M of 1G #1 running 2017-09-25 15:49:46 PM 0.1% 5M of 256M 73M of 1G