Update to use the Centos7/RVM Ruby 2.4.3 base image.

Dockerfile

-FROM fedora:24
+FROM dtucompute/enote-base-centos:v2018
 
 ARG DEPENDENCY_HASH=1
 
 EXPOSE 3000
 
-RUN dnf -y update
-RUN dnf -y install redhat-rpm-config ruby rubygem-rails ruby-devel make gcc zlib-devel tar patch gcc-c++ libxml2-devel
-
-# required for the asset pipeline (uglifier, e.g.)
-RUN dnf -y install npm nodejs
-
-# Enable installing gems from git repos
-RUN dnf -y install git
-
-# required by letsencrypt.  if it's not present, the SSL connection to the let's encrypt server will fail
-RUN dnf -y install openssl
-
-# to handle running as a normal user
-RUN dnf -y install sudo
-
-# run as a non-root user (Issue#57)
-RUN adduser dtuuser && \
-    echo "dtuuser ALL=(root) NOPASSWD:ALL" >> /etc/sudoers
-
+ENV APP_ROOT /app
+WORKDIR $APP_ROOT/
 USER dtuuser
 
-RUN sudo mkdir -p /dtu-course
-RUN sudo chown -R dtuuser:dtuuser /dtu-course
-WORKDIR /dtu-course
+#
+# COURSE
+#
 
-RUN sudo gem install foreman 
-RUN sudo gem install rspec
-RUN sudo gem install thin
+LABEL "github"="https://github.com/dtu-compute/dtu-course-website"
+LABEL version="2018"
+LABEL description="This Dockerfile builds the container \
+to house the DTU course website."
 
 # Install the necessary gems
-COPY Gemfile /dtu-course/Gemfile
+COPY Gemfile $APP_ROOT/Gemfile
 #COPY dtu-core/ /dtu-core
-RUN bundle config github.https true
-RUN bundle install
+RUN /bin/bash -l -c "env"
+RUN /bin/bash -l -c "bundle config github.https true"
+RUN /bin/bash -l -c "bundle install"
 
 # install client-side components 
-COPY package.json /dtu-course/package.json
+COPY package.json $APP_ROOT/package.json
 RUN npm install
 
 # install bower
-COPY .bowerrc /dtu-course/
-COPY bower.json /dtu-course/
+COPY .bowerrc $APP_ROOT/
+COPY bower.json $APP_ROOT/
 RUN sudo npm install -g bower
 RUN bower install --allow-root
 
 # Add PDF.JS
-COPY pdfjs.head.txt /dtu-course/
+COPY pdfjs.head.txt $APP_ROOT/
 RUN git clone https://github.com/dtu-compute/pdf.js pdfjs
 #Local version useful for development.  Just clone into this directory
 #COPY pdfjs pdfjs
 #RUN sudo chown -R dtuuser:dtuuser pdfjs
-RUN pushd pdfjs && \
+RUN cd pdfjs && \
     npm install && \
     npm install gulp && \
     sudo npm install -g gulp && \
-    gulp generic
+    gulp generic && \
+    cd $APP_ROOT
 
 # Copy application code to container
-COPY . /dtu-course
-RUN sudo chown -R dtuuser:dtuuser /dtu-course
-RUN rm -rf /dtu-course/log
-RUN mkdir /dtu-course/tmp
+COPY . $APP_ROOT
+RUN sudo chown -R dtuuser:dtuuser $APP_ROOT
+RUN rm -rf $APP_ROOT/log
+RUN mkdir -p $APP_ROOT/tmp
+RUN mkdir -p $APP_ROOT/log
 
 # generate cookie key
-RUN PRECOMPILE=1 bundle exec rake secret > ~/secret-key-base.txt
+RUN /bin/bash -l -c "PRECOMPILE=1 bundle exec rake secret > ~/secret-key-base.txt"
 
-RUN mkdir -p /dtu-course/log/
-
-RUN RAILS_ENV=production PRECOMPILE=1 bundle exec rake assets:clobber
+RUN /bin/bash -l -c "RAILS_ENV=production PRECOMPILE=1 bundle exec rake assets:clobber"
 
 # Copy bower scripts to public
 # This bypasses the rails pipeline to ensure that the assets are available
 # as-is for askbot (in the case of MathJax) and as a fallback if we decide to 
 # implement fallback.js if/when the CDNs fail
-RUN ls -als
 RUN cp -R vendor/assets/components public/vendor/
 
 RUN mkdir -p public/assets/pdfjs-viewer
@@ -86,8 +70,10 @@ RUN cp -R pdfjs/build/generic/web/* public/assets/pdfjs-viewer/
 RUN cp -R pdfjs/build/generic/web public/assets/pdfjs-viewer/
 RUN cp -R pdfjs/build/generic/build public/assets/pdfjs-viewer/
 
-RUN RAILS_ENV=production PRECOMPILE=1 bundle exec rake assets:precompile
+RUN /bin/bash -l -c "RAILS_ENV=production PRECOMPILE=1 bundle exec rake assets:precompile"
+
+RUN /bin/bash -l -c "RAILS_ENV=test bundle install"
 
-RUN COURSE_ENV=00000 RAILS_ENV=test PRECOMPILE=1 bundle exec rspec spec
+RUN /bin/bash -l -c "COURSE_ENV=00000 RAILS_ENV=test PRECOMPILE=1 bundle exec rspec spec"
 
-CMD ["/bin/sh", "-c", "./run-server.sh  2>&1 | tee /dtu-course/log/run-server.log"]
+CMD ["/bin/bash", "-l", "-c", "./run-server.sh  2>&1 | tee $APP_ROOT/log/run-server.log"]

Gemfile

 source 'https://rubygems.org'
 
+ruby "2.4.3"
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 4.2.7'
@@ -70,7 +71,7 @@ end
 
 group :test do
   gem 'fakefs', :require => "fakefs/safe"
-  gem 'fakeredis', :require => "fakeredis/rspec"
+  gem 'fakeredis', '~> 0.6.0', :require => "fakeredis/rspec"
   gem 'database_cleaner'
   gem 'factory_girl_rails'
 end
@@ -80,7 +81,7 @@ gem 'rubycas-client', '~> 2.3.8', :git => 'https://github.com/rubycas/rubycas-cl
 gem 'nokogiri', '~> 1.6'
 
 # redis
-gem 'redis'
+gem 'redis', '~> 3.2'
 gem 'redis-namespace'
 gem 'redis-rails'
 gem 'redis-rack-cache'

run-server.sh

@@ -7,6 +7,15 @@ timestamp()
 
 echo RUNNING WEBSITE SERVER AS `whoami`
 
+source ~/.bashrc
+
+ruby -v | grep "2\.4\.3"
+rc=$?; if [[ $rc != 0 ]]; then
+  echo "Wrong version of Ruby installed!"
+  ruby -v
+  exit $rc;
+fi
+
 RAILS_ENV=$RAILS_ENV
 : ${RAILS_ENV:="development"}
 export RAILS_ENV
@@ -19,8 +28,8 @@ export SECRET_KEY_BASE=$SECRET_KEY_BASE
 echo REMOVING TMP
 
 rm -rf tmp/*
-rm -rf /dtu-course/log/*
-mkdir -p /dtu-course/log/
+rm -rf $APP_ROOT/log/*
+mkdir -p $APP_ROOT/log/
 
 echo LINKING SHARED ASSETS AND LOGFILES