Setting up your local environment

Let’s walk through a build that uses extensions, step by step. We will see an image extension that installs curl on the builder image, and switches the run image to an image that has curl installed.

Check system requirements

Before we get started, make sure you’ve got the following installed:

Install Docker
Install pack

Ensure Docker is running

docker version

If you see output similar to the following, you’re good to go! Otherwise, start Docker and check again.

Client: Docker Engine - Community
 Version:           20.10.9
 API version:       1.41
 Go version:        go1.16.8
 Git commit:        c2ea9bc
 Built:             Mon Oct  4 16:08:29 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
  Version:          20.10.9
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.8
  Git commit:       79ea9d3
  Built:            Mon Oct  4 16:06:34 2021
  OS/Arch:          linux/amd64
  Experimental:     false

Setup workspace directory

cd <your preferred workspace directory>

Ensure pack version supports image extensions

pack version

The version should be at least 0.31.0

Update pack configuration

pack config experimental true
pack config lifecycle-image --unset

As base image extension with Dockerfiles is currently an experimental feature, we must enable it in pack. We unset any custom lifecycle image that may have been provided to ensure that the latest version is used.

Clone the samples repo

git clone

Next Step