# Bootstrapping a Houdini Instance Using Docker

This file complements [the existing docker documentation](docker.md).  The
file documents, in great detail, how to bootstrap Houdini into a docker
image, primarily from source code wherever possible, from complete scratch.
Special attention was given to verifying the licensing requirements and
details, and to attempt to reproduce the creation of the Docker image from
scratch in the most complete way.  Some of the instructions herein are not
specific to Houdini or Ruby on Rails applications at all; rather, they are
simply documentation of steps that at least one user went through to
bootstrap to a usable docker image.

Commands that were run as pure root have the `#` in front of them; commands
run as a regular user (which sometimes include `sudo`, so note that some of
them are run with system privileges) have a `$` in front of them.

## Creating a Base Image

Since most Docker images have copyleft license compliance problem, rather
than using a docker image from Docker's problematic repositories, we create
a Debian image from scratch.  Using the
[instructions to create one's own base image](https://docs.docker.com/develop/develop-images/baseimages/),
along with
[Debian's deboostrap instructions](https://wiki.debian.org/Debootstrap), to
create a docker image of Debian's `bullseye` release.

    # mkdir /srv/bullseye-base
    # debootstrap bullseye /srv/bullseye-base http://deb.debian.org/debian/
    $ sudo tar -C /srv/bullseye-base -c . | docker import - bullseye-base

If the last command gets the error … 
    Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: …
… then likely the user account that you're using as a regular user is not in
the  `docker` group.

This creates a docker image named `bullseye-base` on your system.

## Building Node 14 from Source

Currently, the default Docker image uses the Debian `nodejs` version
`14.17.4-deb-1nodesource1` as downloaded from this apt-source entry:

    deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_14.x bullseye main

… which leads to this line in the apt-get output:

    Get:9 https://deb.nodesource.com/node_14.x bullseye/main amd64 nodejs amd64 14.17.4-deb-1nodesource1 [25.0 MB]

We have not yet provided a method yet to bootstrap the necessary version of
Node from source.

## Building Yarn 14 from Source

Currently, the default Docker image uses the Debian `nodejs` version
`1.22.5-1` as downloaded from this apt-source entry:

    deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_14.x bullseye main

… which leads to this line in the apt-get output:

     Get:6 https://dl.yarnpkg.com/debian stable/main amd64 yarn all 1.22.5-1 [891 kB]

We have not provided a method yet to bootstrap the necessary version of
Yarn from source.