Fetchy can be used to build minimal docker images with the minimal set of dependencies required, significantly reducing the size of your Docker images.
Fetchy will make it incredibly easy to build your docker
images. Simply using the CLI
fetchy dockerize <name>. Try it!
Furthermore, it is possible to customize the operating system, architecture and operating system version to fetch the latest (secure) packages from a package mirror.
Fetchy works by downloading debian / ubuntu packages based on some
parameter you supply Fetchy. For example, if you tell fetchy to use
ubuntu as a distribution and bionic as its version and download python
Fetchy will look for available packages under
python and download the
packages required to run
python. Then, if tasked to do so, Fetchy will
extract the files of all the packages and wrap them in a Docker image.
Fetchy will try to slim down the image by inspecting dependencies and remove /include packages as it sees fit.
Currently the following features are being worked on:
A folder will be created under ~/.cache for caching.
Or, if specified under
Fetchy can be installed by running the following command:
pip3 install fetchy
pip install fetchy
python3 -m pip install fetchy
Some existing images can be found here https://github.com/ThomasKluiters/fetchy-images
Fetchy can be used as a command line utility, though, it also offers an API.
Create a minimal docker image for a python environment based on your current operating system and architecture.
fetchy dockerize python
You can specify multiple packages:
fetchy dockerize python3.6 postgresql
If you want to build a docker image based on another operating system (debian stretch in this example), this is also possible:
fetchy dockerize --distribution debian --version stretch openssl
You can also use blueprints to build images:
architecture: amd64 base: scratch codename: bionic distribution: ubuntu packages: exclude: - debconf fetch: - python tag: builder
Call fetchy with:
fetchy blueprint blueprint.yml
If some packages are unwanted, you can simply exclude them:
Using a name:
fetchy dockerize --exclude dpkg --exclude perl-base python3
It is also possible to create an exclusion file, where each line denotes a dependency that should not be included:
Using a name:
fetchy dockerize -exclude exclusions.txt python3
Note: exclusion files MUST end with a .txt extension!
If some packages are not available for your main mirror, try using a ppa:
Using a name:
fetchy dockerize --ppa deadsnakes/ppa python3.8
Using a URL:
fetchy dockerize --ppa https://deb.nodesource.com/node_10.x nodejs
fetchy dockerize --ppa https://deb.nodesource.com/node_10.x --ppa deadsnakes/ppa python3.8 nodejs
Fetchy uses poetry to build all sources and collect all requirements. The project can be set up through the following sequence of commands:
pip install poetry git clone https://github.com/ThomasKluiters/fetchy cd fetchy poetry install poetry shell