Node on Docker with HAProxy

Run the ubuntu docker image

docker run -i -t ubuntu /bin/bash

Clone image locally

git https://github.com/itabara/node-docker-sample.git

Build the app docker image

cd node-docker-sample/src
sudo docker build -t node-docker-sample .

Create logs dir into host

sudo mkdir /mnt/logs

docker run -d -v /mnt/logs/:/logs -p 80:80 node-docker-sample
docker ps

Quick test

curl localhost:80

Inspect the container

docker ps
docker inspect <container_id>
curl http://ip:8081

Stop current instance

docker stop <container_id>

Scale out: start two instances of app

docker run -d -v /mnt/logs/:/logs -p 81:80 node-docker-sample
docker run -d -v /mnt/logs/:/logs -p 82:80 node-docker-sample
ps aux | grep node

Build haproxy image

cd haproxy
docker build -t haproxy .

Start the haproxy

docker run -d -v /mnt/logs/:/logs -p 80:80 haproxy

curl http://localhost

ifconfig /all -> get ip of localserver

Attach to the haproxy running image

docker exec -i -t <container_id> bash

vim /opt/haproxy-1.5.3/haproxy.cfg
##replace the 127.0.0.1 with server ip

Supervisorctl

supervisorctl
restart haproxy

The test

curl http://localhost:80

Let's stress our app:

sudo apt-get install apache2-utils
ab -n 10000 -c 10 http://localhost/