cdk warning No routeTableId was provided to the subnet at 'PrivateSubnet1'

user_8406398 0
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I'm associating vpc to my lambda like this:

self.vpc = _ec2.Vpc.from_vpc_attributes(self, 'vpc', vpc_id=self.vpc_id,
                   availability_zones=['eu-west-1a', 'eu-west-1b', 'eu-west-1c'],
                   private_subnet_ids=[self.private_subnet_1, self.private_subnet_2,
                                                                    self.private_subnet_3])

Now when I tried to associate this vpc with my lambda it shows a warning:

No routeTableId was provided to the subnet at 'PrivateSubnet1'. Attempting to read its .routeTable.routeTableId will return null/undefined.

routetableid is optional as per documentation. So how can I get rid of this warning message? Is there any methods can I use to find the lists of routtableid based on vpc and private subnets?

aws-cdk python-3.x
2 Answers

This is annoying me as well.

In the vpc module in CDK there is a piece of code which checks whether the Subnet object has a routeTableId and if not, adds the warning message to the Annotation object of the Subnet Object.

I just raised an upstream issue on github, let's see what the folks there say.

My suggestion is basically to get rid of the whole warning as it's only about a potential situation, in which case I would just have synth fail if it really occurs instead of warning everybody that it might potentially happen.

user_38415190

Are you defining the subnets in this stack itself or importing them ? There is a routeTable attribute available on the subnet.

Having said that, are you getting the error during synth or deploy ? I have something similar on my end and was able to deploy the lambda in the vpc with just the below code.

_vpc = _ec2.Vpc.from_vpc_attributes(
            self, 
            "VPC",
            vpc_id = "vpc-13213",
            availability_zones = ['us-east-1a'],
            private_subnet_ids =  ["subnet-123213"],                    
        )

_lambda.Function(self, "lambda", handler="", ....... vpc=_vpc )

user_35710210
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