Made whenever and cron work in Docker

Author: pbmolini

Dockerfile

@@ -7,7 +7,7 @@ RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
     && curl -sL https://deb.nodesource.com/setup_9.x | bash - \
     && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
     && apt-get update \
-    && apt-get install -qq -y --no-install-recommends build-essential nodejs yarn \
+    && apt-get install -qq -y --no-install-recommends build-essential nodejs yarn cron \
     && rm -rf /var/lib/apt/lists/* \
     && cp /usr/share/zoneinfo/Europe/Rome /etc/localtime
 
@@ -45,4 +45,5 @@ COPY ./docker-entrypoint.sh /
 RUN chmod +x /docker-entrypoint.sh
 ENTRYPOINT ["/docker-entrypoint.sh"]
 
-CMD bundle exec puma
+RUN bundle exec whenever --update-crontab --set environment=development
+CMD cron && bundle exec puma

Gemfile

@@ -131,6 +131,9 @@ gem 'browser'
 # Graphs (using a forked version)
 gem 'gexf', '~> 0.0.7', git: 'https://github.com/Commonfare-net/gexf.rb.git', require: false
 
+# Easy cron jobs
+gem 'whenever'
+
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]

Gemfile.lock

@@ -120,6 +120,7 @@ GEM
       mime-types (>= 1.16)
     childprocess (0.7.1)
       ffi (~> 1.0, >= 1.0.11)
+    chronic (0.10.2)
     chunky_png (1.3.10)
     cocoon (1.2.11)
     coderay (1.1.1)
@@ -401,6 +402,8 @@ GEM
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.2)
+    whenever (0.10.0)
+      chronic (>= 0.6.3)
     xml-simple (1.1.5)
     xpath (2.1.0)
       nokogiri (~> 1.3)
@@ -474,6 +477,7 @@ DEPENDENCIES
   web-console (>= 3.3.0)
   webpacker
   webpacker-react
+  whenever
 
 BUNDLED WITH
    1.16.1

config/schedule.rb

@@ -0,0 +1,27 @@
+# Use this file to easily define all of your cron jobs.
+#
+# It's helpful, but not entirely necessary to understand cron before proceeding.
+# http://en.wikipedia.org/wiki/Cron
+set :chronic_options, hours24: true
+# clone the environment
+ENV.each { |k, v| env(k, v) }
+set :output, '/host_tmp/cron_log.log'
+every :monday, at: '1:00' do
+  rake 'nda:commoners_objects_graph'
+end
+
+# Example:
+#
+# set :output, "/path/to/my/cron_log.log"
+#
+# every 2.hours do
+#   command "/usr/bin/some_great_command"
+#   runner "MyModel.some_method"
+#   rake "some:great:rake:task"
+# end
+#
+# every 4.days do
+#   runner "AnotherModel.prune_old_records"
+# end
+
+# Learn more: http://github.com/javan/whenever

docker-compose.yml

@@ -8,7 +8,8 @@ services:
     command: >
       bash -c "
       rm -f /app/tmp/pids/development.pid;
-      rails server -p 3000 -b 0.0.0.0 --pid /app/tmp/pids/development.pid
+      bundle exec whenever --update-crontab --set environment=development;
+      cron && rails server -p 3000 -b 0.0.0.0 --pid /app/tmp/pids/development.pid
       "
     volumes:
       - ~/tmp:/host_tmp