Getting Started with the pack CLI using Cloud Native Buildpacks
pack is a command line interface (CLI) tool that builds container images locally on your developer machine using Cloud Native Buildpacks.
Before You Begin
There are a few things you need to do before getting started with
Install Docker Desktop. The
packCLI requires the Docker daemon, so you’ll need to have that installed and running locally.
Check out Containers 101 on KubeAcademy, particularly if you’ve never worked with containers or Docker before.
Follow the documentation for installing
packin your local environment.
Build Image from Working Directory
To generate a container image, use
pack build. The following commands will clone a sample Java repository, change to the app directory, and build the container image from this working directory.
git clone https://github.com/buildpacks/samples cd samples/apps/java-maven pack build myapp
Build Image from Specified Path
Alternatively, you may point to the app path using the
git clone https://github.com/buildpacks/samples pack build myapp -p samples/apps/java-maven
Run Image Locally
After you’ve built your image locally, test it out with Docker using the following command:
docker run --rm -p 8080:8080 myapp
localhost:8080 in your favorite browser to see the app running.
Publish Image to Repository
If you are logged into a container registry from your local machine via Docker Desktop, you can build your image and publish to a remote registry at the same time using the
--publish option. Just make sure to clarify the
username before the app name:
pack build username/myapp -p samples/apps/java-maven --publish