Docker as development environment
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The document discusses using Docker as a development environment. It explains what Docker is, how it works using images and containers, and its benefits like having the same environment locally as production. It then provides examples of using Docker with Ruby on Rails applications, including creating Dockerfiles, using Docker Compose to run multiple services like the app and database, and caching gems with a Docker volume. Links are also included for additional reading on using Docker for development.
![FROM ruby:2.2
RUN apt-get update && apt-get install -y nodejs --no-
install-recommends && rm -rf /var/lib/apt/lists/*
ENV RAILS_VERSION 4.2.3
RUN gem install rails --version $RAILS_VERSION
WORKDIR $app
ADD . $app
EXPOSE 3000
CMD ["bundle", "exec", "rails", "s", "-b", "0.0.0.0"]
Dockerfile](https://image.slidesharecdn.com/zuc9ifntgczaeqbdfnz7-signature-2eaecc03ecce7a41ef5e0c9107f558310af630b9c50a5feb63335d47e1eada04-poli-151204031555-lva1-app6891/85/Docker-as-development-environment-19-320.jpg)
![FROM ruby:2.2
RUN apt-get update && apt-get install -y nodejs mysql-client
postgresql-client sqlite3 --no-install-recommends && rm -rf
/var/lib/apt/lists/*
ENV RAILS_VERSION 4.2.3
RUN gem install rails --version $RAILS_VERSION
ENV app /usr/src/app
RUN mkdir $app
WORKDIR $app
ENV BUNDLE_PATH /box
ADD . $app
EXPOSE 3000
CMD ["bundle", "exec", "rails", "s", "-b", "0.0.0.0"]
Ruby and Rails Create app image](https://image.slidesharecdn.com/zuc9ifntgczaeqbdfnz7-signature-2eaecc03ecce7a41ef5e0c9107f558310af630b9c50a5feb63335d47e1eada04-poli-151204031555-lva1-app6891/85/Docker-as-development-environment-26-320.jpg)
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Docker as development environment
- 2. Bruno de Lima e Silva Games Graduate degree in mobile Parto Humanizado Crowdmobi, Trakto Qviky Coding Dojo
- 6. VirtualizationVirtualization Why I should use it?
- 7. VirtualizationVirtualization You don't need to install everything
- 9. VirtualizationVirtualization How to do it?
- 10. ● What? ● “Here it works”, who’s never? ● New team member ● Provision != drean ● Overhead Same as production environment
- 11. Docker
- 12. Docker “Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries – anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in.” - Docker docs What is it?
- 13. Docker How it works? ● Docker Hub ● Images ● Build Images ● Share host resources
- 14. Docker Is it better?
- 15. Docker How run docker commands docker run <image> command
- 16. Docker and Ruby ● Create a ruby file (hello.rb), with this: ● Run it with docker docker run --rm -v "$(pwd)":/app -w /app ruby:2.2 'ruby hello.rb' puts ‘The Power of Docker’
- 17. and Node ● Create a node file (hello.js), with this: ● Run it with docker Docker docker run --rm -v "$(pwd)":/app -w /app node 'node hello.js' console.log(‘Node works too’);
- 18. ● To link the app we need to start postgres and give it a name ● Then, start the app linking it to postgres Docker docker run -d --name db -e POSTGRES_PASSWORD=123456 postgres docker run -d -P --link db:dbLink image command and PostgreSql
- 19. FROM ruby:2.2 RUN apt-get update && apt-get install -y nodejs --no- install-recommends && rm -rf /var/lib/apt/lists/* ENV RAILS_VERSION 4.2.3 RUN gem install rails --version $RAILS_VERSION WORKDIR $app ADD . $app EXPOSE 3000 CMD ["bundle", "exec", "rails", "s", "-b", "0.0.0.0"] Dockerfile
- 20. ● Lots of commands ● Lots of params ● I don’t want to remember that all just to run the app ● and that Dockerfile Docker is getting harder
- 21. Docker-Compose
- 22. ● Compose multiple containers ● Just configure it ● Run a single command Docker-Compose docker-compose up
- 23. Sample web: build: . ports: - "5000:5000" volumes: - .:/code links: - redis redis: image: redis Docker-Compose
- 24. Ruby and Rails On Dockercompose
- 25. db: image: postgres ports: - "5432:5432" environment: - POSTGRES_USER=postgres - POSTGRES_PASS=postgres Ruby and Rails Start from DB
- 26. FROM ruby:2.2 RUN apt-get update && apt-get install -y nodejs mysql-client postgresql-client sqlite3 --no-install-recommends && rm -rf /var/lib/apt/lists/* ENV RAILS_VERSION 4.2.3 RUN gem install rails --version $RAILS_VERSION ENV app /usr/src/app RUN mkdir $app WORKDIR $app ENV BUNDLE_PATH /box ADD . $app EXPOSE 3000 CMD ["bundle", "exec", "rails", "s", "-b", "0.0.0.0"] Ruby and Rails Create app image
- 27. #!/bin/bash bundle check || bundle install bundle exec rails s -b 0.0.0.0 -p 3000 rm -f tmp/pids/server.pid Ruby and Rails Create app start script
- 28. box: image: busybox volumes: - /box Ruby and Rails Add busybox
- 29. web: &default build: . command: ./script/start.sh volumes: - .:/usr/src/app volumes_from: - box ports: - "3000:3000" links: - db Ruby and Rails Create web
- 30. worker: << *default command: bundle exec rake jobs:work Ruby and Rails Create workers
- 31. mailcatcher: hostname: mailcatcher image: "schickling/mailcatcher" command: mailcatcher -f --ip=0.0.0.0 ports: - "1080:1080" - "1025:1025" Ruby and Rails Create MailCatcher
- 34. +BrunoDeLimaS Bruno de Lima @brunodles That’s all folksThat’s all folks +BrunoDeLimaS Bruno de Lima @brunodles https://github.com/Padawan-org/Padawan-Docker