├── nginx
    ├── start
    ├── Dockerfile
    └── nginx.tmpl
├── app
    ├── Dockerfile
    └── app.py
├── README.md
└── docker-compose.yml


/nginx/start:
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1 | #!/bin/bash
2 | 
3 | j2 /nginx.tmpl > /etc/nginx/nginx.conf
4 | nginx
5 | 


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/app/Dockerfile:
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 1 | FROM python
 2 | 
 3 | RUN pip install flask redis
 4 | 
 5 | WORKDIR /
 6 | 
 7 | COPY app.py /
 8 | 
 9 | EXPOSE 5000
10 | 
11 | CMD python app.py
12 | 


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/nginx/Dockerfile:
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 1 | FROM nginx:latest
 2 | RUN apt-get update -y
 3 | RUN apt-get install -y python-pip
 4 | RUN pip install j2cli
 5 | COPY start /start
 6 | RUN chmod +x /start
 7 | COPY nginx.tmpl /nginx.tmpl
 8 | CMD /start
 9 | EXPOSE 80
10 | 


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/README.md:
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1 | # docker-compose example 
2 | 
3 | This is the example used in my [blog][1] to show how to construct an environment with loadbalancing with docker-compose.
4 | 
5 | [1]: http://eyenx.ch/2015/04/18/loadbalancing-containers-with-docker-compose/
6 | 


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/docker-compose.yml:
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 1 | app:
 2 |   build: app
 3 |   links:
 4 |     - redis
 5 | haproxy:
 6 |   image: tutum/haproxy
 7 |   links:
 8 |     - app
 9 |   environment:
10 |     - BACKEND_PORT=5000
11 | redis:
12 |   image: redis
13 | nginx:
14 |   build: nginx
15 |   ports:
16 |     - "80:80"
17 |   links:
18 |     - haproxy
19 | 


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/app/app.py:
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 1 | #!/usr/bin/env python
 2 | 
 3 | from flask import Flask
 4 | import socket,redis,os
 5 | 
 6 | r=redis.Redis(host=os.getenv("REDIS_PORT_6379_TCP_ADDR"),port=os.getenv("REDIS_PORT_6379_TCP_PORT"))
 7 | r.set("count",0)
 8 | 
 9 | app = Flask(__name__)
10 | 
11 | @app.route("/")
12 | def index():
13 |     r.incr("count")
14 |     return "Visit number %d\nHostname: %s\n" % (int(r.get("count")),socket.gethostname())
15 | 
16 | if __name__ == "__main__" :
17 |     app.run(host="0.0.0.0")
18 | 


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/nginx/nginx.tmpl:
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 1 | user  nginx;
 2 | daemon off;
 3 | worker_processes  1;
 4 | 
 5 | error_log  /proc/self/fd/2 warn;
 6 | pid        /var/run/nginx.pid;
 7 | 
 8 | 
 9 | events {
10 |     worker_connections  1024;
11 | }
12 | 
13 | 
14 | http {
15 |     resolver 8.8.8.8;
16 |     include       /etc/nginx/mime.types;
17 |     default_type  application/octet-stream;
18 | 
19 |     log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
20 |                       '$status $body_bytes_sent "$http_referer" '
21 |                       '"$http_user_agent" "$http_x_forwarded_for"';
22 | 
23 |     access_log  /var/log/nginx/access.log  main;
24 | 
25 |     sendfile        on;
26 |     #tcp_nopush     on;
27 | 
28 |     keepalive_timeout  65;
29 | 
30 |     #gzip  on;
31 | 
32 |     #include /etc/nginx/conf.d/*.conf;
33 | 
34 | server {
35 |         listen 80;
36 |         server_name localhost;
37 |         access_log /proc/self/fd/1;
38 |         error_log /proc/self/fd/2;
39 |         location / {
40 |             proxy_intercept_errors on;
41 |             proxy_pass http://{{ HAPROXY_PORT_80_TCP_ADDR }}:{{ HAPROXY_PORT_80_TCP_PORT }}$request_uri?;
42 |             proxy_set_header Host $server_name;
43 |         }
44 | }
45 | }
46 | 


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