random .NET and web development musings

Here is a great post on troubleshooting your AWS ELB.

The point that caught me out for about 10 hours today was that if you have your ELB configured for multiple Availability Zones, it doesnt matter if your assigned instance list doesn’t contain any instances from some of the AZs, it will still route traffic to those zones, which will get lost and result in a 503 (or 504/324).

So, DONT assign AZs that dont have any in-service instances running.

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