Drunken Coder

Automated Clustered Load Testing with EC2 & node

Posted 05/10/2013

I made a simple little clustered testing system, using NodeStressSuite. Basically, I want it to launch a bunch of instances, clobber a server, then remove all the machines.

This is all automated, so you just run the EC2-builder, and run it. This is basically a legit use of a DDOS botnet. Here is how I did it.

To get my loadtester, check out the github page.

Testing Framework

NodeStressSuite is a still-developed version of nodeload. It’s a lot like Apache’s ab, but written in javascript, multi-suystem concurrent, and fancy! Be sure to go check it out to get an idea of the cool stuff you can do with it.

Here is how I added it to my project:

npm install --save "git://github.com/Samuel29/NodeStressSuite.git#master"

This will install nss.

Modular tests

I want to be able to just plug-in a modular test, whenever I need to test something new. I want to include all the options needed to test a server. Here is the basic test I wrote, which includes all the options to stress-test http://jetboystudio.com. I save it as jetboy.js:

// simple 3 minutes test

module.exports = {
    name: "jetboy",
    comment:"Simple load test for Jetboy Studio",
    host: 'www.jetboystudio.com',
    port: 80,
    timeLimit: 180,
    loadProfile: [[0,0], [180,400] ],
    stats: [
        {name: 'latency', percentiles: [0.95]},
    requestGenerator: function(client) {
        return client.request({method:'GET', path: '/'});

This is a simple 3 minute stress test. Your test will probably be a bit differnt, just have a look at nss and my test for inspiration.

Do some testing

Make ~/.aws to look like this:

    "endpoint": "us-west-2"

Obviously, replace the Doctor Who reference with your AWS credentials, and set endpoint to your favorite zone (us-west-2: Portland, represent!) Make a keypair called deploy and create a security-group called loadtest that opens ports 22 (ssh) and 3000 (default test port.)

So, now that we have a test setup, let’s spin-up a bunch of AWS instances to run it:

loadtest --instances=5 jetboy.js

This will turn on 5 AWS instances, and wait for them, then send the test. You can view the output at http://localhost:3000

To see your available options, run loadtest --help


Cool SSH Trick

I have a generic disposable SSH keypair for working on projects on AWS. I like to not have to remember dumb details (especially when I’m drunk.)

David KonsumerWritten by David Konsumer who lives and works in Portland and makes rad stuff. You should follow him on Twitter & Github