Docker + Serf + HAProxy

Setup

boot2docker

$ boot2docker init
$ VBoxManage modifyvm "boot2docker-vm" --natpf1 "tcp-port8080,tcp,,8080,,8080"
$ boot2docker start

Build Haproxy-serf image

$ cd haproxy
$ docker build -t tcnksm/haproxy .

Build Nginx-serf image

$ cd web
$ echo '<h1>web1</h1>' > index.html
$ docker build -t tcnksm/web1 .
$ echo '<h1>web2</h1>' > index.html
$ docker build -t tcnksm/web2 .

Run

Run haproxy container

$ docker run -d -t -p 8080:80 -p 7946 --name proxy tcnksm/haproxy

Run web container

$ docker run -d -t --link proxy:serf tcnksm/web1
$ docker run -d -t --link proxy:serf tcnksm/web2

Access it

$ curl http://0.0.0.0:8080

Debug from host

$ serf agent -bind 127.0.0.1 -join $(docker port proxy 7946)
$ serf members

From OSX, serf can join proxy container, but can not send gossip to another web containers Because they send docker network IP address. This is just membership debugging.

Reference

• AUTO-LOADBALANCING DOCKER WITH FIG, HAPROXY AND SERF