How to build sidekiq and rails image with docker? - mysql

Question

I am trying another way to build a rails application into a docker image.
The structure of my services:
redis -- from official docker hub registry
fluentd -- from official docker hub registry
mysql -- from official docker hub registry
sidekiq -- build myself(maybe there isn't a official image for this)
web -- build myself
I created two Dockerfiles like:
Dockerfile.sidekiq
Dockerfile.web
Dockerfile.sidekiq
FROM ruby:2.2.2
ENV APP_HOME /myapp
RUN mkdir $APP_HOME
WORKDIR $APP_HOME
ADD Gemfile $APP_HOME/Gemfile
ADD Gemfile.lock $APP_HOME/Gemfile.lock
ADD config/sidekiq.yml $APP_HOME/config/sidekiq.yml
ADD init_sidekiq.sh $APP_HOME/
RUN export LANG=C.UTF-8 && bundle install
ADD . $APP_HOME
CMD ["sh", "init_sidekiq.sh"]
init_sidekiq.sh
#!/bin/sh
bundle exec sidekiq -C config/sidekiq.yml
Dockerfile.web
FROM rails:4.2.1
ENV APP_HOME /myapp
RUN mkdir $APP_HOME
WORKDIR $APP_HOME
ADD Gemfile $APP_HOME/Gemfile
ADD Gemfile.lock $APP_HOME/Gemfile.lock
ADD init_web.sh $APP_HOME/
RUN export LANG=C.UTF-8 && bundle install
ADD . $APP_HOME
CMD ["sh", "init_web.sh"]
init_web.sh
#!/bin/sh
bundle exec rake db:create db:migrate
bundle exec rails server -b 0.0.0.0
Use them I built two images:
myapp_web
myapp_sidekiq
Then run these containers:
$ docker run --name redis -d redis
$ docker run --name fluentd -d -p 24224:24224 fluent/fluentd
$ docker run --name mysql -e MYSQL_ROOT_PASSWORD=my_password -d mysql
Make env.list
RAILS_ENV=production
DATABASE_URL=mysql2://root:my_password#172.17.0.4/myapp?checkout_timeout=20000
Go on run these containers:
$ docker run --name web -d -p 3000:3000 --link mysql:mysql --env-file ./env.list myapp_web
$ docker run --name sidekiq -d --link mysql:mysql --env-file ./env.list myapp_sidekiq
The result:
redis -- success
fluentd -- success
mysql -- success
web -- success
sidekiq -- failure
The sidekiq log:
$ docker logs sidekiq
Unknown database 'myapp'
/usr/local/bundle/gems/activerecord-4.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:23:in `rescue in mysql2_connection'
I used the same method both web and sidekiq to connect mysql. I believe that in the mysql container there exists a myapp database. But why it can't find it?
Is it a wrong way to make them been two containers? How to run sidekiq correctly?

Answer 1

I think the problem there is how are you connecting to redis? The message appears to come from sidekiq and somehow it can't connect to your redis server. (and I think trying to connect to some bogus db server/database)
So I think you need to link your sidekiq container to both your db container and also your redis container.
docker run --name sidekiq -d --link mysql:mysql --link redis:redis --env-file ./env.list myapp_sidekiq
Also, would be nice if you can share your env.list