Docker + Nginx Proxying

docker_defaults

# Docker Upstart and SysVinit configuration file

# Customize location of Docker binary (especially for development testing).
#DOCKER="/usr/local/bin/docker"

# Use DOCKER_OPTS to modify the daemon startup options.
#DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
DOCKER_OPTS="-D -H 127.0.0.1:8081 -H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock"

# If you need Docker to use an HTTP proxy, it can also be specified here.
#export http_proxy="http://127.0.0.1:3128/"

# This is also a handy place to tweak where Docker's temporary files go.
#export TMPDIR="/mnt/bigdrive/docker-tmp"

docker_site_config

upstream docker {
  server unix:/var/run/docker.sock fail_timeout=0;
}

server {
  listen 80;
  location / {
    proxy_pass http://docker;
    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    client_max_body_size 10m;
    client_body_buffer_size 128k;

    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_http_version 1.1;
    proxy_buffering off;
  }
}

docker_test.rb

require 'docker'

# Direct Docker socket or...
socket = 'http://192.168.33.10:4243'
# ...Nginx proxy socket
#socket = 'http://192.168.33.10'

dockerfile = <<-EOH.gsub(/^  /, '')
  FROM ubuntu:12.04
  RUN apt-get update
  RUN echo HELLO
EOH

opts = {}
docker_connection = Docker::Connection.new(socket, read_timeout: 300)

image = Docker::Image.build(dockerfile, opts, docker_connection) do |chunk|
  puts "CHUNK: #{chunk}"
end

stdout

# Hitting Docker directly #

CHUNK: {"stream":"Step 0 : FROM ubuntu:12.04\n"}
CHUNK: {"stream":" ---\u003e c0fe63f9a4c1\n"}
CHUNK: {"stream":"Step 1 : RUN apt-get update\n"}
CHUNK: {"stream":" ---\u003e Using cache\n"}
CHUNK: {"stream":" ---\u003e 39e90547aa66\n"}
CHUNK: {"stream":"Step 2 : RUN echo HELLO\n"}
CHUNK: {"stream":" ---\u003e Using cache\n"}
CHUNK: {"stream":" ---\u003e dad6e71caa9f\n"}
CHUNK: {"stream":"Successfully built dad6e71caa9f\n"}

# Hitting Docker proxied through Nginx #

CHUNK: {"stream":"Step 0 : FROM ubuntu:12.04\n"}
{"stream":" ---\u003e c0fe63f9a4c1\n"}
{"stream":"Step 1 : RUN apt-get update\n"}
CHUNK: {"stream":" ---\u003e Using cache\n"}
CHUNK: {"stream":" ---\u003e 39e90547aa66\n"}
CHUNK: {"stream":"Step 2 : RUN echo HELLO\n"}
CHUNK: {"stream":" ---\u003e Using cache\n"}
CHUNK: {"stream":" ---\u003e dad6e71caa9f\n"}
CHUNK: {"stream":"Successfully built dad6e71caa9f\n"}