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Custom buildpacks

Custom buildpacks

This is an experimental feature. In this case, this means: we offer long-term support for the ability to have custom buildpacks, but you are responsible for maintaining your custom buildpack.

Cloud Foundry (the underlying open source project behind uses buildpacks to allow your applications to be deployed. officially supports a set of buildpacks, and it also allows you to provide your own.

For example, if you want to use the “R” buildpack, you can push your code by typing:

cf push myapp -b

Once you push your code using a custom buildpack, cannot update it for you. You are responsible for keeping it up to date. Please see this description of responsibilities.

Example custom buildpacks


If you may need multiple buildpacks for a project, we recommend splitting your project into multiple applications and using one buildpack for each application, or building assets on CI.

If you can’t do that, Cloud Foundry is capable of deploying multi-language projects with a custom buildpack, cf-buildpack-multi. This buildpack applies any buildpacks listed in the .buildpacks file. Multi-buildpack deploys can be difficult to debug because cf-buildpack-multi hides the error logs.

apt-buildpack does not allow the use of sudo inside of buildpacks. If your app depends on a library that is apt-get installable, you can use the CF flavor of apt-buildpack, which is a custom buildpack. This can work with cf-buildpack-multi.

You can see this in the wild in 18F’s iaa-pdf-api repo, which depends on the pdftk library.