Getting started with buildpacks

Kf supports a variety of buildpacks. This document covers some starter examples for using them.

Before you begin

  • You should have Kf running on a cluster.
  • You should have run kf target -s <space-name> to target your space.

Java (v2) Buildpack

Use spring initializr to create a Java 8 maven project with a spring web dependency and JAR packaging. Download it, extract it, and once extracted you can generate a JAR.

./mvnw package

Push the JAR to Kf with the Java v2 buildpack.

kf push java-v2 --path target/helloworld-0.0.1-SNAPSHOT.jar

Java (v3) Buildpack

Use spring initializr to create a Java 8 maven project with a spring web dependency and JAR packaging. Download it, extract it, and once extracted, push to Kf with the cloud native buildpack.

kf push java-v3 --stack org.cloudfoundry.stacks.cflinuxfs3

Python (v2) Buildpack

Create a new directory with files as shown in the following structure.

tree . ├── Procfile ├── requirements.txt └── server.py
cat Procfile web: python server.py
cat requirements.txt Flask
cat server.py from flask import Flask import os app = Flask(__name__) @app.route('/') def hello_world():  return 'Hello, World!' if __name__ == "__main__":  port = int(os.getenv("PORT", 8080))  app.run(host='0.0.0.0', port=port)

Push the Python flask app using v2 buildpacks.

kf push python --buildpack python\_buildpack

Python (v3) Buildpack

(same as above)

Push the Python flask app using cloud native buildpacks.

kf push pythonv3 --stack org.cloudfoundry.stacks.cflinuxfs3

Staticfile (v2) Buildpack

Create a new directory that holds your source code.

Add an index.html file with this content.

<!DOCTYPE html> <html lang="en"> <head><title>Hello, world!</title></head> <body><h1>Hello, world!</h1></body> </html>

Push the static content with the staticfile buildpack.

kf push staticsite --buildpack staticfile\_buildpack

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