Hey Guys, I have an issue with Pulumi on Golang. I am trying to create a new EKS Cluster, and pass the

clusterArgs

the subnet ID’s of the VPC I have created in a different stack. I am getting the output from the stack reference like this:

stack, err := pulumi.NewStackReference(ctx, Name, nil)
if err != nil {
   log.Fatalf("Got error while trying to get a new stack reference! Error: %s", err)
}
VpcPublicSubnetIdsOutput := stack.GetStringOutput(pulumi.String("vpcPublicSubnetIds"))
vpcPrivateSubnetIdsOutput := stack.GetStringOutput(pulumi.String("vpcPrivateSubnetIds"))

VpcPublicSubnetIds := pulumi.ToStringArrayOutput([]pulumi.StringOutput{VpcPublicSubnetIdsOutput})
vpcPrivateSubnetIds := pulumi.ToStringArrayOutput([]pulumi.StringOutput{vpcPrivateSubnetIdsOutput})

So VpcPublicSubnetIds & vpcPrivateSubnetIds are both of type

pulumi.StringArrayOutput

But I can’t figure out how to pass the subnet ID’s to the clusterArgs, by indexing the elements from VpcPublicSubnetIds & vpcPrivateSubnetIds ! I tried doing it like this:

eksCluster, err := eks.NewCluster(ctx, values.Name, &eks.ClusterArgs{
   Name:  pulumi.StringPtr(values.Name),
   VpcId: vpcId,
   PublicSubnetIds: pulumi.StringArray{
      pulumi.StringInput(VpcPublicSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(0))),
      pulumi.StringInput(VpcPublicSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(1))),
      pulumi.StringInput(VpcPublicSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(2))),
      pulumi.StringInput(VpcPublicSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(3))),
   },
   PrivateSubnetIds: pulumi.StringArray{
      pulumi.StringInput(vpcPrivateSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(0))),
      pulumi.StringInput(vpcPrivateSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(1))),
      pulumi.StringInput(vpcPrivateSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(2))),
      pulumi.StringInput(vpcPrivateSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(3))),
   },

what am I doing wrong?

you can’t index

StringArrayOutput

until you’ve resolved it inside an

ApplyT

in your case though, you should be able to just pass the

VpcPublicSubnetIds

directly to

PublicSubnetIds

Thanks for the reply @billowy-army-68599 When I tried passing it directly to

PublicSubnetIds

I get the following error:

error: program failed: waiting for RPCs: marshaling properties: awaiting input property privateSubnetIds: failed to convert []interface {} to string
    exit status 1

can you show me what you’re trying to do?

yep, that’s my code:

stack, err := pulumi.NewStackReference(ctx, name, nil)
	if err != nil {
		log.Fatalf("Got error while trying to get a new stack reference! Error: %s", err)
	}
	vpcId := stack.GetStringOutput(pulumi.String("vpcId"))

	VpcPublicSubnetIdsOutput := stack.GetStringOutput(pulumi.String("vpcPublicSubnetIds"))
	vpcPrivateSubnetIdsOutput := stack.GetStringOutput(pulumi.String("vpcPrivateSubnetIds"))

	VpcPublicSubnetIds := pulumi.ToStringArrayOutput([]pulumi.StringOutput{VpcPublicSubnetIdsOutput})
	vpcPrivateSubnetIds := pulumi.ToStringArrayOutput([]pulumi.StringOutput{vpcPrivateSubnetIdsOutput})
	
	eksCluster, err := eks.NewCluster(ctx, values.Name, &eks.ClusterArgs{
	Name:             pulumi.StringPtr(values.Name),
	VpcId:            vpcId,
	PublicSubnetIds:  VpcPublicSubnetIds,
	PrivateSubnetIds: vpcPrivateSubnetIds,
	})

I’m sort of surprised, I’d expect that to work https://github.com/jaxxstorm/iac-in-go/blob/master/eks/main.go#L142

@billowy-army-68599 Maybe it’s because I am using a different package I am using

<http://github.com/pulumi/pulumi-eks/sdk/go/eks|github.com/pulumi/pulumi-eks/sdk/go/eks>

Instead of

<http://github.com/pulumi/pulumi-aws/sdk/v2/go/aws/eks|github.com/pulumi/pulumi-aws/sdk/v2/go/aws/eks>

that you showed (I picked that package since I want to use the

NodeGroupOptions

option for a managed node grouyp, that the other package is missing

@prehistoric-sandwich-7272 can you check one thing quickly, when you grab the stack reference value (ie:

VpcPublicSubnetIdsOutput

) it’s of type

pulumi.AnyOutput

?

Ok I swear that I have tried the exact thing a couple of hours ago, but suddenly doing:

PublicSubnetIds:  pulumi.StringArrayOutput(stackReference.GetOutput(pulumi.String("vpcPublicSubnet"))),
PrivateSubnetIds: pulumi.StringArrayOutput(stackReference.GetOutput(pulumi.String("vpcPrivateSubnet"))),

worked!! I have no idea why, I even went and exported all the subnets from the vpc stack one by one - ie:

ctx.Export("vpcPublicSubnet1", vpc.PublicSubnetIds.Index(<http://pulumi.Int|pulumi.Int>(0)))

and so on And updated the VPC stack came back to the EKS and the above method worked all of a sudden.... maybe there was a bug in the export? maybe it needed a refresh? I don’t know - after two days of debugging I feels ridiculous.. but i’ll take it 😅

great news!

Ok never mind the said method doesn’t work....

2022/07/10 19:31:30 map[org:****]
    error: program failed: waiting for RPCs: rpc error: code = Unavailable desc = error reading from server: read tcp 127.0.0.1:59633->127.0.0.1:59632: use of closed network connection
    exit status 1

going back to exporting them one by one