Deploy Ruby on Rails application with Docker Compose and Capistrano with ease

ruby_on_rails_deployment.md

Files and Folders.

|
|\_ app
|...
|\_ docker
| |
| |\_ development
| |\_ staging
|  \_ production
|   |
|   |\_ .env
|   |\_ app-env.onf
|   |\_ app.nginx.conf
|   |\_ Dockerfile
|   |\_ postgres-env.conf
|    \_ rails-env.conf
|
|\_ docker-compose.yml
|\_ docker-compose.staging.yml
 \_ docker-compose.production.yml

Your docker/development folder contain Dockerfile for your development. Staging and Production have the same file, but their content will be different. For example, .env file which contain your secret.

".env", This file will be use as an application environment while deploying.

This file should be listed in your gitignore

RAILS_ENV=production
SECRET_KEY_BASE=your_secret_key

Please note that, your SECRET_KEY_BASE should never ever appear in your repository, I add it here because I have it in my .gitignore file. This file will later be copied to your remote host.

"app-env.conf", application environment.

# /etc/nginx/conf.d/00_app_env.conf
# File will be overwritten if user runs the container with `-e PASSENGER_APP_ENV=...`!
passenger_app_env production;

"app.nginx.conf", an Nginx configuration for your server. Please note that your ruby version at the last line must match your Docker file base image ruby version.

# /etc/nginx/sites-enabled/app.nginx.conf:
server {
    listen 80;
    root /home/app/your_app_name/public;

    passenger_enabled on;
    passenger_user app;

    passenger_ruby /usr/bin/ruby2.3;
}

"Dockerfile", base image for your application.

FROM phusion/passenger-ruby23:latest
MAINTAINER Wiwatta  Mongkhonchit "[email protected]"

# Set correct environment variables.
ENV HOME /root

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

# Expose Nginx HTTP service
EXPOSE 80

# Start Nginx / Passenger
RUN rm -f /etc/service/nginx/down

# Remove the default site
RUN rm /etc/nginx/sites-enabled/default

# Nginx App setup
ADD docker/staging/app.nginx.conf /etc/nginx/sites-enabled/app.nginx.conf
ADD docker/staging/postgres-env.conf /etc/nginx/main.d/postgres-env.conf
ADD docker/staging/rails-env.conf /etc/nginx/main.d/rails-env.conf
ADD docker/staging/app-env.conf /etc/nginx/conf.d/00_app_env.conf

# Update for security reason
RUN apt-get update && apt-get upgrade -y -o Dpkg::Options::="--force-confold"

# Gem caching
WORKDIR /tmp
ADD Gemfile /tmp/
ADD Gemfile.lock /tmp/
RUN bundle install --jobs 20 --retry 5

# App setup
#
# This is your application setup steps, you should also do what you need to do here to make your 
# application working for production environment.
#
WORKDIR /home/app/your_app_name
ADD . /home/app/your_app_name
RUN rm -f config/database.yml
RUN mv config/database.yml.sample config/database.yml
RUN chown -R app:app /home/app/your_app_name
RUN rake assets:precompile RAILS_ENV=production

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

"postgres-env.conf", just a postgres environment variable, so that your app can pickup your database.

# /etc/nginx/main.d/postgres-env.conf:
env POSTGRES_PORT_5432_TCP_ADDR;
env POSTGRES_PORT_5432_TCP_PORT;

"rails-env.conf", To set environment variable for your application while running. This related to your .env file.

# /etc/nginx/main.d/rails-env.conf:
env RAILS_ENV;
env SECRET_KEY_BASE;

References

• Phusion Passenger Docker

No such file or directory @ rb_file_s_stat - 'docker/production/.env'

setup:env
01 ls
✔ 01 ubuntu@ip
02 pwd
02 /home/ubuntu
✔ 02 ubuntu@ip

Why can't I find the .env file?

@h00dstoker this gist use an old docker/docker-compose version. There might be a change in how docker-compose read a file. By the way, what is the step it fails?

@zentetsukenz Thanks for answering.
I could understand the operation. It was lack of knowledge on my part.
Thanks for the tutorial.

anyone could give me for all required files & it's content?