(vpc): cant reference a default sg when choosing a existing vpc

General Issue

cant reference a default sg when choosing a existing vpc

The Question

This is my cdk code:

        # choose or create a vpc
        if use_default_vpc == 1:
            self.vpc = ec2.Vpc.from_lookup(self, 'VPC', is_default = True) 
        elif vpc_id != "":
            self.vpc = ec2.Vpc.from_lookup(self, 'VPC', is_default = False,vpc_id = vpc_id) 
        else:
            self.vpc = ec2.Vpc(self, "VPC",
            max_azs=1, # single AZ
            subnet_configuration=[
                {"name":"public","subnetType":ec2.SubnetType.PUBLIC},
                {"name":"private","subnetType":ec2.SubnetType.PRIVATE}
                ]
            )


        # create fsx for lustre, if we use 2.4T storage, then must apply LZ4 compression, but not found in cdk?

        self.file_system = fsx.LustreFileSystem(
            self,'FSX',
            lustre_configuration={"deployment_type": fsx.LustreDeploymentType.PERSISTENT_1,
                                    "per_unit_storage_throughput":100}, # 
            vpc = self.vpc,
            vpc_subnet=self.vpc.public_subnets[0],
            storage_capacity_gib = 4800,

            ##### 
            removal_policy=cdk.RemovalPolicy.DESTROY,
            security_group = ec2.SecurityGroup.from_security_group_id(
                                self,"FSXSG",
                                security_group_id=self.vpc.vpc_default_security_group
                            ),
        )

the sg of fsx works fine when creating a new vpc, but when it comes to using the default vpc or manually choosing a vpc via vpcid, got error for:

cdk synth

Traceback (most recent call last):
  File "app.py", line 36, in <module>
    vpc_stack = EC2VPCCdkStack(app, "EC2VPCCdkStack",
  File "/Users/twuam/Library/Python/3.8/lib/python/site-packages/jsii/_runtime.py", line 86, in __call__
    inst = super().__call__(*args, **kwargs)
  File "/Users/twuam/Desktop/AWSome Builder/2&3/af2-batch-cdk/af2_batch_cdk/vpc_ec2.py", line 106, in __init__
    self, "default_security_group", self.vpc.vpc_default_security_group
  File "/Users/twuam/Library/Python/3.8/lib/python/site-packages/jsii/_reference_map.py", line 149, in __getattr__
    raise AttributeError(f"'%s' object has no attribute '%s'" % (type_info, name))
AttributeError: '<class 'aws_cdk.core.Resource'>+<class 'aws_cdk.aws_ec2._IVpcProxy'>' object has no attribute 'vpc_default_security_group'
Subprocess exited with error 1

how am I supposed to solve this?

CDK CLI Version

1.128.0 (build 1d3883a)

Framework Version

No response

Node.js Version

No response

OS

No response

Language

Python

Language Version

No response

Other information

No response

[peterwoodworth]

Thanks for the response @jumic

I’ll try to get your proposed solution gets looked at soon, this is highly desired by customers so it should be high priority 😃

[github-actions[bot]]

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