What EC2 instances available in London?

Seems like a simple question, right?

However, it starts getting a little more intricate when you look a the details. Let’s say I want an m3.medium. Here’s my goto info page:


Cool – these are available.


But lets say I need them for Elasticache.

OK, looking at: https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/CacheNodes.SupportedTypes.html

I can see a cache.m3.medium. But then, reading further on – i.e. the Supported Node Types by AWS Region section – as of the time of posting this blog post, m3 is not supported in EU (London). Nor in EU (Paris).

m4is supported in EU (London). But not in EU (Paris)!

Fortunately, we’re only looking for London.

So, the obvious choice would be an m4.medium. However, scanning back up to the top of the Supported Node Types page the smallest available is a cache.m4.large.

It’s all in the details!