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When declaring and EC2 instance per two different availability zones, I need to determine which private subnet id in the VPC is available in the availability zone for that EC2 instance.  Is there a way to do this by interrogating the resources?

The <https://www.pulumi.com/docs/reference/pkg/aws/ec2/getsubnet/|getSubnet> function includes the availabilityZone so you could use that. Put the 2 subnets into a collection and then use `.apply` to narrow it to the single desired subnet

actually even better: <https://www.pulumi.com/docs/reference/pkg/aws/ec2/getsubnetids/#using|this function> can be provided filters and takes in a VPC ID so you can provide an availability zone filter and receive only the desired Subnet ID in return

I am creating my VPC with `awsx.ec2.Vpc.fromExistingIds` , so hopefully this won’t pose a problem

hmmmm I think it depends, some of the crosswalk APIs expect to be passed an actual `Pulumi.Resource` instance. But if you're using APIs that accept just a Subnet ID than mixing the providers shouldn't be an issue

The cloudformation template that creates the VPC is tagging the subnets appropriately enough that I should be able to filter specifically how I need!  Thanks again.

I think an alternative (homegrown) version of awsx's VPC, with AZs as a collection of subnets, would be helpful..