Template error: Fn::Select cannot select nonexistent value at index 1 about aws-cf-templates HOT 8 CLOSED

Okay. The issue has been solved, the problem was the the two other availability zones (eu-west-1a and eu-west-1b) did not have a default subnet. And since I only deployed to eu-west-1c, I had not experienced any problems.

For reference, here is the reply from Amazon support:

Thanks for contacting AWS Premium Support!

I understand you have a template which launches in the Frankfurt region but not the Dublin region.

I've been able to launch that template myself without issue so I've been looking over your account for any possible cause.

I notice that the first resource to fail creation is SubnetBPublic. I see that this makes use of the function !GetAZs. !GetAZs will return all AZs in the account which have a 'Default' subnet in them. The issue is if you have deleted the subnet from a VPC that was marked as default, that AZ won't be returned by GetAZs here. See further info on this here: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-getavailabilityzones.html

Looking at your account, I see that there is a default subnet only in eu-west-1c, so only that AZ will be returned to !GetAZs. Then !Select [1, !GetAZs ''] is trying to access a second element that does not exist.

The solution to this is to create at least one new subnet in each AZ. This should be marked as default automatically.

Alternatively if you wish I can manually intervene and set existing subnets of your choice as default for a given AZ. If you wish for me to do this please provide the subnet IDs and the respective AZ which you want them to be the default for.

I hope this is clear, but if you have any questions or concerns don't hesitate to let me know.

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thanks for forwarding this.

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Yes Thanks you !

To clarify create default subnet

> aws ec2 create-default-subnet --availability-zone eu-west-3a
> aws ec2 create-default-subnet --availability-zone eu-west-3b
> aws ec2 create-default-subnet --availability-zone eu-west-3c

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Okay, since I ran this template as part of setting up Wordpress (https://github.com/widdix/aws-cf-templates/tree/master/wordpress), a deployment to Frankfurt zone is not a solution.

Because EFS is not supported by Frankfurt region:

So any help in executing the vpc-2azs.yaml is appreciated.

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I think thisissue is at least related to #36

@Ruprect can you check if you have a default vpc in the region where you deploy the stack? You will find the VPCs here: https://console.aws.amazon.com/vpc/home#vpcs:
There is a Default VPC column to indicate if the VPC is a default vpc.

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I have added an answer to #36 - I do have a Default VPC.

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@Ruprect do you have developer, business or enterprise support in the AWS account where the template fails? I can nor reproduce the issue in any of my accounts where I have a support plan. Would be interested in what the AWS Support has to say.

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I will contact support with this issue, and relay the answer here

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