Jet

Jet is a tool to convert source code into Docker images. Jet inspects your source code to create a Dockerfile with caching layers and any required system dependencies.

Language Support

Jet will detect your app from the following languages and package managers:

• Go - dep, glide, godep, go modules, govendor
• Node.js - npm, yarn
• PHP - composer
• Python - conda, pip, pipenv
• Ruby - bundler

Comparison Table

Feature	Jet	Cloud Native Buildpacks	Repo2docker	Source-to-Image
Supported Languages	Go, Node.js, PHP, Python, Ruby	Java, Node.js	Python	Node.js, Perl, PHP, Python, Ruby
Best Practices Dockerfile	✅	❌	✅	❌
Hourly Runtime Updates	✅	❌	❌	❌

Installation

Jet is supported on MacOS, Linux and Windows as a standalone binary. You can download the latest binary from the releases page on GitHub.

MacOS

You can install with Homebrew:

brew install lade-io/tap/jet

Linux

You can download the latest tarball, extract and move to your $PATH:

curl -L https://github.com/lade-io/jet/releases/latest/download/jet-linux-amd64.tar.gz | tar xz
sudo mv jet /usr/local/bin

Build From Source

You can build from source with Go:

go get github.com/lade-io/jet

Examples

Build Node.js app:

$ jet build testdata/node/node12/ -n node-app
$ docker run -p 5000:5000 node-app

Debug Node.js app:

$ jet debug testdata/node/node12/
FROM node:12

ENV PATH=/home/node/app/node_modules/.bin:$PATH

USER node
RUN mkdir -p /home/node/app/
WORKDIR /home/node/app/

COPY --chown=node:node package.json package-lock.json ./
RUN npm ci

COPY --chown=node:node . ./

CMD ["node", "server.js"]

Debug Python and Django app:

$ jet debug testdata/python/django/
FROM python:3.9

ENV PATH=/home/web/.local/bin:$PATH

RUN groupadd --gid 1000 web \
        && useradd --uid 1000 --gid web --shell /bin/bash --create-home web

USER web
RUN mkdir -p /home/web/app/
WORKDIR /home/web/app/

COPY --chown=web:web requirements.txt ./
RUN pip install -r requirements.txt

COPY --chown=web:web . ./

CMD ["gunicorn", "django_web_app.wsgi:application"]

Debug Ruby on Rails app:

$ jet debug testdata/ruby/rails5/
FROM ruby:2.7.7

RUN wget -qO node.tar.gz "https://nodejs.org/dist/v18.13.0/node-v18.13.0-linux-x64.tar.gz" \
        && tar -xzf node.tar.gz -C /usr/local --strip-components=1 \
        && rm node.tar.gz

RUN corepack enable

RUN groupadd --gid 1000 web \
        && useradd --uid 1000 --gid web --shell /bin/bash --create-home web

USER web
RUN mkdir -p /home/web/app/
WORKDIR /home/web/app/

COPY --chown=web:web Gemfile Gemfile.lock ./
RUN bundle install

COPY --chown=web:web package.json yarn.lock ./
RUN yarn install

COPY --chown=web:web . ./

CMD ["sh", "-c", "puma -p ${PORT-3000}"]

Credits

• Test cases imported from Cloud Foundry Buildpacks licensed under Apache License 2.0