Building my Jekyll blog in Docker using Ubuntu
Preface
I need Python to build my Jekyll site and the official Docker image to build Jekyll sites looks like a mess to me.
Building Jekyll in Docker
The official image uses alpine as base, but I eventually found out I might
get less of a headache using ubuntu:20.04 instead. That gives me good support
for both Ruby and Python 3.8 without too much hassle.
I’m not going to use the Jekyll HTTP server, but instead copy the site into
a slim nginx image using Docker multi-stage builds.
FROM ubuntu:20.10 AS base
RUN apt-get update \
&& apt-get install -y --no-install-recommends \
ruby-full build-essential zlib1g-dev \
git python3 \
&& rm -rf /var/lib/apt/lists/* \
&& groupadd -g 1000 jekyll \
&& useradd -mu 1000 -g jekyll jekyll
USER jekyll
WORKDIR /home/jekyll
ENV GEM_HOME=/home/jekyll/gems \
PATH="/home/jekyll/gems/bin:${PATH}"
RUN gem install jekyll bundler
ADD Gemfile Gemfile.lock ./
RUN bundle install
ADD --chown=jekyll:jekyll . ./src
WORKDIR /home/jekyll/src
RUN bundle exec jekyll build --destination ../build --trace
FROM nginx:1.19-alpine
COPY --from=base /home/jekyll/build /usr/share/nginx/html
COPY ./.deploy/default.conf /etc/nginx/conf.d/default.conf
This gives for a very small image in the end.
Take a look at the current source of this Dockerfile for updates. It’s the very file that builds this blog.
References
- https://github.com/docker-library/mongo/blob/master/4.4/Dockerfile
- https://jekyllrb.com/docs/installation/ubuntu/
- https://hub.docker.com/r/jekyll/builder/tags
- https://github.com/stigok/jekyll-docker/blob/master/repos/jekyll/Dockerfile
If you have any comments or feedback, please send me an e-mail. (stig at stigok dotcom).
Did you find any typos, incorrect information, or have something to add? Then please propose a change to this post.