Pushing an App with Multiple Processes

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This topic describes how to push and manage apps with multiple processes.

About Processes

The Cloud Foundry API (CAPI) V3 supports using a single command to push apps that run multiple processes, such as a web app that has a UI process and a worker process. To push an app that creates multiple processes from the same codebase, you first define its processes in a Procfile. For more information, see Push an App with Multiple Processes below.

For more information about processes, see Processes in the CAPI V3 documentation.

Push an App with Multiple Processes

This section describes how to push an app with multiple processes using either a manifest or a Procfile.

Push an App with Multiple Processes Using a Manifest

To push an app with multiple processes using a manifest:

  1. Create a file that defines a manifest. Include each process with its start command. See the following example, which defines the app example-app with two processes:

    version: 1
    - name: example-app
      processes:
      - type: web
        command: bundle exec rackup config.ru -p $PORT
        instances: 3
      - type: worker
        command: bundle exec rake worker:start
        health-check-type: process
        instances: 2
    
  2. Push the app using your manifest:

    cf push -f example-manifest.yml
    

For more information about defining processes with manifests, see processes in App Manifest Attribute Reference.

Push an App with Multiple Processes Using a Procfile

To push an app with multiple processes using a Procfile:

Note: Procfile support varies depending on the buildpack you use. For example, the Staticfile buildpack requires a Staticfile instead of a Procfile. For more information, see Staticfile Buildpack.

  1. Create a file named Procfile in the root of your app directory.

    Note: For more information about Procfiles, see Procfiles in the CAPI V3 documentation.

  2. 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
    
  3. Push the app:

    cf push myapp
    

By default, the web process has a route and one instance. Other processes have zero instances by default.

Scale a Process

To scale an app process:

  • cf CLI v7:
  1. Run:

    cf scale APP-NAME --process PROCESS-NAME -i INSTANCE-COUNT
    

    Where:

    • APP-NAME is the name of your app.
    • PROCESS-NAME is the name of the process you want to scale.
    • INSTANCE-COUNT is the number of instances to which you want to scale the process.
  • cf CLI v6:
  1. Run:

    cf v3-scale APP-NAME --process PROCESS-NAME -i INSTANCE-COUNT
    

    Where:

    • APP-NAME is the name of your app.
    • PROCESS-NAME is the name of the process you want to scale.
    • INSTANCE-COUNT is the number of instances to which you want to scale the process.

      Note: This command is experimental and unsupported. Consider upgrading to cf CLI v7 to use a supported version of this command. To upgrade to cf CLI v7, see Install cf CLI v7 in Upgrading to cf CLI v7.

View Processes

To view the processes running as part of an app, run cf APP-NAME, where APP-NAME is the name of your app. See the following example in which the app has a web and a worker process.

$ 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: cflinuxfs3
 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