Hello, I have a simple VPC where I am trying to get a subnet ID to use in an

aws.ec2.NetworkInterface

. The VPC is defined as:

const vpc = new awsx.ec2.Vpc("culex-vpc", {
  cidrBlock: "10.50.0.0/16",
  numberOfAvailabilityZones: 1,	// defaults to 2, but for a lab 1 is good enuf
  subnets: [
    { type: "public", location: "10.50.20.0/24", tags },
    { type: "private", location: "10.50.30.0/24", tags }
  ],
  tags
});

How would I get the private subnet to use in the

subnetId

property in

aws.ec2.NetworkInterface

? I tried using

subnetId: vpc.id.apply(async () => vpc.privateSubnetsIds),

as seen above here, but have issues with it being the wrong type for

subnetId

.

Can't you use the

privateSubnets()

method? https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/awsx/ec2/#Vpc-privateSubnets

TypeScript is upset about the type.

Subnet ID to create the ENI in.

Type 'Promise<Subnet[]>' is not assignable to type 'Input<string>'.
  Type 'Promise<Subnet[]>' is not assignable to type 'Promise<string>'.
    Type 'Subnet[]' is not assignable to type 'string'.ts(2322)
networkInterface.d.ts(339, 5): The expected type comes from property 'subnetId' which is declared here on type 'NetworkInterfaceArgs'

Hmm maybe something like

output(vpc.privateSubnets()).apply(subnets => subnet[0].id)

?

thanks!

subnetId: output(vpc.getSubnets("private").then(subnet => subnet[0].id)),

gets the type error to go away 😄 lets see if it actually works!