The Cloud Foundry CLI (cf CLI) includes commands that provide detailed control over app pushes. When you use these commands, you can choose to perform only some steps of the cf push process or perform specific actions between the steps that are normally run as part of running cf push.

Here are some example use cases for the sub-step commands:

  • Updating a third party system before staging an app
  • Retrying failed stagings without incurring downtime
  • Calling external services to report audit data during push
  • Scanning a droplet before deploy
  • Integrating with a change request system
  • Running droplets built on a different Cloud Foundry deployment

To support these custom push workflows, Cloud Foundry divides apps into smaller building blocks. The following table describes these building blocks as resources and lists the command associated with each one.

For information on using these commands, see Example Workflows below.

Important The cf CLI v6 commands described in this topic are experimental and unsupported. Consider upgrading to cf CLI v7 to use supported versions of these commands. To upgrade to cf CLI v7, see Install cf CLI v7 in Upgrading to cf CLI v7.

Resource Description Commands
App The top-level resource that represents an app and its configuration.
For more information, see Apps in the CAPI documentation.
  • cf app
  • cf apps
  • cf create-app
Package The source code that makes up an app.
For more information, see Packages in the CAPI documentation.
  • cf create-package
  • cf packages
Build Staging the app. Creating a build combines a Package with a Buildpack and builds it into an executable resource, called a Droplet.
For more information, see Builds in the CAPI documentation.
  • cf stage-package
Droplet An executable resource that results from a Build.
For more information, see Droplet in the CAPI documentation.
  • cf download-droplet
  • cf droplets
  • cf set-droplet
Manifest A file used when pushing your app to apply bulk configuration to an app and its underlying processes.
For more information, see Space Manifest in the CAPI documentation.
  • cf apply-manifest
  • cf create-app-manifest

Example Workflows

The following sections describe example workflows for working with the cf push sub-step commands.

Push an App Using Sub-Step Commands

This example workflow describes how to push an app using sub-step commands instead of cf push.

  1. Create your app with cf CLI:

    cf create-app APP-NAME
    

    Where APP-NAME is the name you give your app.

  2. From your app directory, create a package for your app.

    cf create-package APP-NAME
    

    Where APP-NAME is the name of your app.

  3. Locate and copy the package guid from the output of an earlier step or by using the cf packages command. See the following example output:

    Uploading and creating bits package for app APP-NAME in org test / space test as admin...
     package guid: 0dfca85a-8ed4-4f00-90d0-3ab08852dba8
     OK
    
  4. Stage the package you created:

    cf stage-package APP-NAME --package-guid PACKAGE-GUID
    

    Where:

    • APP-NAME is the name of your app.
    • PACKAGE-GUID is the package GUID you recorded in an earlier step.
  5. Locate and copy the droplet guid from the output of an earlier step or by using the cf droplets command. See the following example output:

    Staging package for APP-NAME in org test / space test as admin...
    ...
    Package staged
     droplet guid: f60d3464-415a-4202-9d40-26a70373a487
     state: staged
     created: Mon 25 Sep 16:37:45 PDT 2018
    
  6. Assign the droplet to your app:

    cf set-droplet APP-NAME DROPLET-GUID
    

    Where:

    • APP-NAME is the name of your app.
    • DROPLET-GUID is the droplet GUID you recorded in an earlier step.
  7. Start your app:

    cf start APP-NAME
    

    Where APP-NAME is the name of your app.

Roll Back to a Previous Droplet

This example workflow describes how to roll back to a previous droplet used by your app. You may want to use this, for example, if you update your app and it has a bug that causes it to crash.

  1. List the droplets for your app:

    cf droplets APP-NAME
    

    Where APP-NAME is the name of your app.

  2. From the output, locate and copy the second-to-last GUID. In the following example, this is 66524145-5502-40e6-b782-47fe68e13c49.

    Listing droplets of app APP-NAME in org test / space test as admin...
    
    guid state created
    	66524145-5502-40e6-b782-47fe68e13c49 staged Mon 25 Sep 16:37:34 PDT 2018
    	0677ad93-9f77-4aaa-9a6b-44da022dcd58 staged Mon 25 Sep 16:44:55 PDT 2018
    
  3. Stop your app:

    cf stop APP-NAME
    

    If you wish to avoid incurring downtime when changing your droplet, consider using Rolling deployemnts instead of stopping and starting your app.

  4. Set the app to use the previous droplet:

    cf set-droplet APP-NAME PREVIOUS-DROPLET-GUID
    

    Where:

    • APP-NAME is the name of your app.
    • PREVIOUS-DROPLET-GUID is the droplet GUID you recorded in an earlier step.
  5. Start your app:

    cf start APP-NAME
    

    Where APP-NAME is the name of your app.

Downloading and uploading droplets

This example workflow describes how to download a built droplet and then push it to an app. You might want to use this for building apps in one location and then deploying it elsewhere. For instance, you might use this to “promote” built apps from pre-production environments to production environments, without having to re-build the app.

  1. Download the current droplet for your app:

    cf download-droplet APP-NAME --path PATH
    

    Where APP-NAME is the name of your app and PATH is the file path to download the droplet to.

  2. Log in to the desired Cloud Foundry environment and target the organization and space where you want to run the droplet you downloaded.

  3. Push a new or existing app with the downloaded droplet:

    cf push APP-NAME --droplet PATH
    

    Where APP-NAME is the name of your app and PATH is the file path to the downloaded droplet.

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