How to install system packages in a project¶
All Divio Cloud projects are based on a customised Docker image, which uses a version of Ubuntu Linux.
If your project requires a particular system package, you can include them in
the Docker image, by listing the commands required to install them - typically,
RUN apt-get - in the
The commands in the
Dockerfile are executed in order, so an appropriate
place to put such commands is early on, after:
# <DOCKER_FROM> FROM aldryn/base-project:py3-3.23 # </DOCKER_FROM>
and before any Python-related commands that might depend on the package.
You should include an
apt-get update in the installation commands, and run
apt-get with the
-y (“Say yes”) option, for example:
RUN apt-get update RUN apt-get install -y wkhtmltopdf
To rebuild the docker image, installing the new packages:
docker-compose build web
The build output will show the new
RUN instructions being executed as part
of your build.
To make a quick check that the command installs what you require, without
having to rebuild the entire project, jump into a new container running
docker-compose run --rm web bash
This container will disappear (
--rm) when you exit.