jekyll-dev/Dockerfile

# Dockerfile to build and serve a jekyll site with the development webserver
FROM ubuntu:focal
LABEL Description="This image is used to learn building dockerfiles" \
      Author="david@socialnerds.org" \
      Version="0.1" \
      License="MIT"

# environment variables
ENV JEKYLL_SITE=default
ENV USER_ID=1000
ENV GROUP_ID=1000

# expose port for `jekyll serve`
EXPOSE 4000

# volume definitions
VOLUME ["/mnt"]

# prepare the baseimage and create 
RUN apt-get update && apt-get install -y ruby ruby-dev gcc g++ make libssl-dev libreadline-dev && \
    gem update && gem install jekyll bundler && \
    groupadd -g $GROUP_ID jekyll-dev && \
    useradd -u $USER_ID -g $GROUP_ID -M -d /mnt -s /bin/false jekyll-dev

USER jekyll-dev

RUN cd /mnt && \
    if [ ! -d "/mnt/$JEKYLL_SITE" ]; then jekyll new $JEKYLL_SITE; fi && \
    cd $JEKYLL_SITE && bundle install

# run command
CMD bundle exec jekyll serve --host=0.0.0.0 --incremental