ruby-on-rails – 如何在单个容器Docker环境中的Amazon Elastic

Dockerfile

在这个例子中,我使用phusion / passenger-ruby22：0.9.16作为基本图像,因为：

>您的Dockerfile可以更小.
>它减少了编写正确的Dockerfile所需的时间.您不必担心基本系统和堆栈,您可以专注于您的应用程序.
>它正确设置了基本系统.很容易让基本系统出错,但是这个图像可以正确地完成所有操作. Learn more.
>它大大减少了运行docker build所需的时间,使您可以更快地迭代Dockerfile.
>它减少了重新部署期间的下载时间. Docker只需要下载一次基本映像：在第一次部署期间.在每个后续部署中,仅下载您在基础映像之上所做的更改.

你可以learn more about it here …无论如何,到Dockerfile上.

# The FROM instruction sets the Base Image for subsequent instructions. As such,# a valid Dockerfile must have FROM as its first instruction. We use
# phusion/baseimage as a base image. To make our builds reproducible,we make
# sure we lock down to a specific version,not to `latest`!
FROM phusion/passenger-ruby22:0.9.16

# The MAINTAINER instruction allows you to set the Author field of the generated
# images.
MAINTAINER "Job King'ori Maina" <yo@kingori.co> (@itsmrwave)

# The RUN instructions will execute any commands in a new layer on top of the
# current image and commit the results. The resulting committed image will be
# used for the next step in the Dockerfile.

# === 1 ===

# Prepare for packages
RUN apt-get update --assume-yes && apt-get install --assume-yes build-essential

# For a JS runtime
# http://nodejs.org/
RUN apt-get install --assume-yes nodejs

# For Nokogiri gem
# http://www.nokogiri.org/tutorials/installing_nokogiri.html#ubuntu___debian
RUN apt-get install --assume-yes libxml2-dev libxslt1-dev

# For RMagick gem
# https://help.ubuntu.com/community/ImageMagick
RUN apt-get install --assume-yes libmagickwand-dev

# Clean up APT when done.
RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

# === 2 ===

# Set correct environment variables.
ENV HOME /root

# Use baseimage-docker's init process.
CMD ["/sbin/my_init"]

# === 3 ====

# By default Nginx clears all environment variables (except TZ). Tell Nginx to
# preserve these variables. See nginx-env.conf.
COPY nginx-env.conf /etc/nginx/main.d/rails-env.conf

# Nginx and Passenger are disabled by default. Enable them (start Nginx/Passenger).
RUN rm -f /etc/service/nginx/down

# Expose Nginx HTTP service
EXPOSE 80

# === 4 ===

# Our application should be placed inside /home/app. The image has an app user
# with UID 9999 and home directory /home/app. Our application is supposed to run
# as this user. Even though Docker itself provides some isolation from the host
# OS,running applications without root privileges is good security practice.
RUN mkdir -p /home/app/myapp
WORKDIR /home/app/myapp

# Run Bundle in a cache efficient way. Before copying the whole app,copy just
# the Gemfile and Gemfile.lock into the tmp directory and ran bundle install
# from there. If neither file changed,both instructions are cached. Because
# they are cached,subsequent commands—like the bundle install one—remain
# eligible for using the cache. Why? How? See ...
# http://ilikestuffblog.com/2014/01/06/how-to-skip-bundle-install-when-deploying-a-rails-app-to-docker/
COPY Gemfile /home/app/myapp/
COPY Gemfile.lock /home/app/myapp/
RUN chown -R app:app /home/app/myapp
RUN sudo -u app bundle install --deployment --without test development doc

# === 5 ===

# Adding our web app to the image ... only after bundling do we copy the rest of
# the app into the image.
COPY . /home/app/myapp
RUN chown -R app:app /home/app/myapp

# === 6 ===

# Remove the default site. Add a virtual host entry to Nginx which describes
# where our app is,and Passenger will take care of the rest. See nginx.conf.
RUN rm /etc/nginx/sites-enabled/default
COPY nginx.conf /etc/nginx/sites-enabled/myapp.conf

Dockerrun.aws.json

{
  "AWSEBDockerrunVersion": "1","Ports": [
    {
      "ContainerPort": "80"
    }
  ],"Logging": "/home/app/myapp/log"
}

.dockerignore

/.bundle
/.DS_Store
/.ebextensions
/.elasticbeanstalk
/.env
/.git
/.yardoc
/log/*
/tmp

!/log/.keep

nginx的-env.conf

请注意,rails-env.conf不会在Nginx之外设置任何环境变量,因此您将无法在shell中看到它们(即Dockerfile).您还必须使用不同的方法为shell设置环境变量.

# By default Nginx clears all environment variables (except TZ) for its child
# processes (Passenger being one of them). That's why any environment variables
# we set with docker run -e,Docker linking and /etc/container_environment,# won't reach Nginx. To preserve these variables,place an Nginx config file
# ending with *.conf in the directory /etc/nginx/main.d,in which we tell Nginx
# to preserve these variables.

# Set by Passenger Docker
env RAILS_ENV;
env RACK_ENV;
env PASSENGER_APP_ENV;

# Set by AWS Elastic Beanstalk (examples,change accordingly)
env AWS_ACCESS_KEY_ID;
env AWS_REGION;
env AWS_SECRET_KEY;
env DB_NAME;
env DB_USERNAME;
env DB_PASSWORD;
env DB_HOSTNAME;
env DB_PORT;
env MAIL_USERNAME;
env MAIL_PASSWORD;
env MAIL_SMTP_HOST;
env MAIL_PORT;
env SECRET_KEY_BASE;

nginx.conf

server {
  listen 80;
  server_name _;
  root /home/app/myapp/public;

  # The following deploys your app on Passenger.

  # Not familiar with Passenger,and used (G)Unicorn/Thin/Puma/pure Node before?
  # Yes,this is all you need to deploy on Passenger! All the reverse proxying,# socket setup,process management,etc are all taken care automatically for
  # you! Learn more at https://www.phusionpassenger.com/.
  passenger_enabled on;
  passenger_user app;

  # Ensures that RAILS_ENV,RACK_ENV,PASSENGER_APP_ENV,etc are set to
  # "production" when your application is started.
  passenger_app_env production;

  # Since this is a Ruby app,specify a Ruby version:
  passenger_ruby /usr/bin/ruby2.2;
}