Posts tagged as:

elb

Elastic Load Balancing with Sticky Sessions

April 8, 2010

At long last, the most oft-requested feature for EC2′s Elastic Load Balancer is here: session affinity, also known as “sticky sessions”. What is session affinity? Why is this feature in such high demand? How can it be used with existing applications? Let’s take a look at these questions. But first, let’s explore what a session [...]

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Use ELB to Serve Multiple SSL Domains on One EC2 Instance

December 24, 2009

This is one of the coolest uses of Amazon’s ELB I’ve seen yet. Check out James Elwood’s article. You may know that you can’t serve more than one SSL-enabled domain on a single EC2 instance. Okay, you can but only via a wildcard certificate (limited) or a multi-domain certificate (hard to maintain). So you really [...]

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Solving Common ELB Problems with a Sanity Test

September 7, 2009

Help! My ELB isn’t serving files! Whoa! My back-end instances work but not the ELB! Hey! I can’t get the ELB to work! These are among the most common Elastic Load Balancer problems raised on the Amazon EC2 Discussion Forums. Inspired by Eric Hammond’s indispensible article Solving “I can’t connect to my server on Amazon [...]

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Elastic Load Balancer: An Elasticity Gotcha

August 14, 2009

If you use AWS’s Elastic Load Balancer to allow your EC2 application to scale, like I do, then you’ll want to know about this gotcha recently reported in the AWS forums. By all appearances, it looks like something that should be fixed by Amazon. Until it is, you can reduce (but not eliminate) your exposure [...]

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EC2 Instance Belonging to Multiple ELBs

July 23, 2009

I discovered an interesting feature of Amazon EC2 Elastic Load Balancing today: you can add an EC2 instance to more than one ELB virtual appliance. Below I demonstrate the steps I took to set up two ELBs each containing the same instance, and afterward I explain how this technique can be used to deliver different [...]

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The “Elastic” in “Elastic Load Balancing”: ELB Elasticity and How to Test it

July 12, 2009

Elastic Load Balancing is a long-anticipated AWS feature that aims to ease the deployment of highly-scalable web applications. Let’s take a look at how it achieves elasticity, based on experience and based on the information available in the AWS forums (mainly this thread). The goal is to understand how to design and test ELB deployments [...]

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