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Last pushed: 5 months ago
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nginx based http server image managed by supervisor
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Refer to

Rails Container configuration for production

This is the setup that I use for the next rails production application. The point for this setup is that I want to keep nginx and unicorn on same container rather then sepearate ones (although this may not be suitable for some production cases).


As containers are mostly surving a single process at time, Supervisor is used to manage multiple processeses running on this container: nginx (& unicorn later when we use this image to deploy our app).

When using this image, you should add program of rails process in /etc/supervisor.d/*.ini so supervisor will pick it up

a sample of unicorn.ini:

command=/app/bin/bundle exec unicorn -c /app/config/unicorn.rb -E production


For nginx it'd be a pretty standard setup of creating your version of a nginx configuration /etc/nginx/nginx.conf and a unicorn upstream configuration /etc/nginx/conf.d/default.conf.


user nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/;

events {
    worker_connections  1024;

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;    
    include /etc/nginx/conf.d/*.conf;


upstream app {
    # Path to Unicorn SOCK file, as defined previously
    server unix:/app/shared/sockets/unicorn.sock fail_timeout=0;

server {
    listen 80;

    root /app/public;

    try_files $uri/index.html $uri @app;

    location @app {
        proxy_pass http://app;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_redirect off;

    error_page 500 502 503 504 /500.html;
    client_max_body_size 4G;
    keepalive_timeout 10;


And here's what my unicorn.rb look like

# set path to application
app_dir = File.expand_path("../..", __FILE__)
shared_dir = "#{app_dir}/shared"
working_directory app_dir

# Set unicorn options
worker_processes 2
preload_app true
timeout 30

# Set up socket location
listen "#{shared_dir}/sockets/unicorn.sock", :backlog => 64

# Logging
stderr_path "#{shared_dir}/log/unicorn.stderr.log"
stdout_path "#{shared_dir}/log/unicorn.stdout.log"

# Set master PID location
pid "#{shared_dir}/pids/"
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