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This is a container that uses Nginx as a Load Balancer for a Node.js application using Serf for auto-discovery of new nodejs containers.

It does not depend on Node.js but the serf-member-join.sh script will detect any node.js (or web) container available to Serf and add it to the load balancer.

Nginx will not check if a host is alive, that's Serf's job.

The nginx.conf file it's configured to serve static files, but it needs access to the static files at /var/www so make sure you link the volume with your application when running the container.

I'm using fig to start the container, this is the important part:

serf:
  image: luis/serf
  ports:
   - "7373"
   - "7946"
web:
  build: .
  links:
   - mongodb:mongodb
   - elasticsearch:elasticsearch
   - serf:serf
  expose:
   - "3000"
  volumes:
   - "/var/www:/var/www"
   - "/var/log/docker:/var/log/supervisor"
   - "/var/files:/var/files"
  environment:
   MONGODB_DATABASE: somedb
   NODE_ENV: production
lb:
  image: luis/nginx-lb
  ports:
    - "80:80"
  links:
    - serf:serf
  volumes:
   - "path-to-some-default.conf:/etc/nginx/sites-enabled"
   - "/var/www:/var/www"
   - "/var/log/docker:/var/log/supervisor"
   - "/var/files:/var/files"

As you can see, both my load balancer and web application links to the serf container. I'm also mounting the same volumes for both my web container and the lb container. Finally, the web container will be built using a Dockerfile that I'm including in my application.

Note: You can mount /etc/nginx/sites-enabled and include a default configuration, I'm adding in config/default-example.conf the file I'm using but you can change it if you want to. This fill will be added to the container in case you don't mount the directory. The file MUST be named "default" so the scripts can add new containers as soon as serf detects them

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luis

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