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Do you mean 3 private subnets and one public subnet? If so, that’s not possible with AWSX and isn’t in line with best practices anyway. Your subnets should be uniform in all AZs, and you should have at least 3 AZs for any production workload.

Yes, I mean 3 private subnets and one public subnet. I tried it by using

nat_gateways

option:

def create_vpc():
    <http://log.info|log.info>('[base.vpc.create_vpc]')
    eip = pulumi_aws.ec2.Eip(
        f"eip{DEPLOY_NAME_PREFIX}"
    )
    vpc = pulumi_awsx.ec2.Vpc(
        VPC_NAME,
        cidr_block="12.0.0.0/16",
        subnet_specs=[
            pulumi_awsx.ec2.SubnetSpecArgs(
                type=pulumi_awsx.ec2.SubnetType.PRIVATE,
                tags={
                    CLUSTER_TAG: "owned",
                    '<http://kubernetes.io/role/internal-elb|kubernetes.io/role/internal-elb>': '1',
                },
            ),
            pulumi_awsx.ec2.SubnetSpecArgs(
                type=pulumi_awsx.ec2.SubnetType.PUBLIC,
                tags={
                    CLUSTER_TAG: "owned",
                    '<http://kubernetes.io/role/elb|kubernetes.io/role/elb>': '1',
                },
            ),
        ],
        availability_zone_names=AVAILABILITY_ZONE_NAMES,
        nat_gateways=pulumi_awsx.ec2.NatGatewayConfigurationArgs(
            strategy=pulumi_awsx.ec2.NatGatewayStrategy.SINGLE,
            elastic_ip_allocation_ids=[eip.id],
        ),
        tags={"name": f"{VPC_NAME}-tag"}
    )
    return vpc

Did this end up working for you?