Posts tagged as:

elastic load balancing

AWS Auto-Scaling and ELB with Reliable Root Domain Handling

January 24, 2011

Update May 2011: Now that AWS Route 53 can be used to allow an ELB to host a domain zone apex, the technique described here is no longer necessary. Cool, but not necessary. Someone really has to implement this. I’ve had this draft sitting around ever since AWS announced support for improved CloudWatch alerts and [...]

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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

Update March 2012: Amazon published their own official guide to ELB’s architecture and building and testing applications that use it. The official material is very consistent with the presentation offered here, more than two and a half years prior. Elastic Load Balancing is a long-anticipated AWS feature that aims to ease the deployment of highly-scalable web [...]

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