Consistent Availability Zones in VPCs

Question

hello, I am trying to deploy VPCs across different AWS accounts but I do want to keep the Availability Zones consistent. Which means that use1-az6 named as us-east-1a in AWS account A is created as use1-az6 named as us-east-1a in AWS account B.

I tried implementing this using the template provided by AWS below but the AZs did not stay consistent between the 2 AWS accounts.

https://docs.aws.amazon.com/prescriptive-guidance/latest/patterns/use-consistent-availability-zones-in-vpcs-across-different-aws-accounts.html

Has anyone tried implementing this and have it working?

Jimmy Dahlqvist · Accepted Answer

Hi.

That is not how the AZ naming works. You have a AZ ID which is consistent across all AWS accounts, for example `use1-az1`, this represents the same physical location in every AWS account. Then you have the logical name for example `us-east-1a`.
So when you create consistent AZ across accounts the logical names will be different but the solution you link to will the use the AZ ID to look up the consistent logical AZ.

You can read more in the [documentation](https://docs.aws.amazon.com/ram/latest/userguide/working-with-az-ids.html)

Consistent Availability Zones in VPCs

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