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AWS Lambda (sdk) InvalidSubnetIDException encountered when deploying an AWS Lambda function.

The specified subnet ID is invalid.

Understanding AWS Lambda

AWS Lambda is a serverless compute service that allows you to run code without provisioning or managing servers. It automatically scales your applications by running code in response to triggers such as changes in data, shifts in system state, or user actions. Lambda is designed to handle various workloads and is integrated with many AWS services, making it a versatile tool for developers.

Identifying the Symptom

When deploying an AWS Lambda function, you might encounter an error message stating InvalidSubnetIDException. This error indicates that there is an issue with the subnet ID specified in your Lambda function configuration.

Common Error Message

The error message typically looks like this:

{
"errorMessage": "InvalidSubnetIDException: The specified subnet ID is invalid."
}

Exploring the Issue

The InvalidSubnetIDException occurs when the subnet ID provided in the Lambda function configuration is not recognized by AWS. This can happen due to several reasons, such as a typo in the subnet ID, the subnet ID not existing in the specified Virtual Private Cloud (VPC), or the subnet being deleted or unavailable.

Potential Causes

  • Incorrect subnet ID due to a typographical error.
  • The subnet ID does not exist in the specified VPC.
  • The subnet has been deleted or is in a different region.

Steps to Fix the Issue

To resolve the InvalidSubnetIDException, follow these steps:

Step 1: Verify the Subnet ID

Ensure that the subnet ID you are using is correct. You can verify the subnet ID by navigating to the AWS VPC Console and checking the list of subnets in your VPC.

Step 2: Check the VPC Configuration

Make sure that the subnet ID exists within the VPC associated with your Lambda function. You can use the following AWS CLI command to list subnets in a specific VPC:

aws ec2 describe-subnets --filters "Name=vpc-id,Values="

Replace <your-vpc-id> with your actual VPC ID.

Step 3: Update the Lambda Configuration

If the subnet ID was incorrect, update your Lambda function configuration with the correct subnet ID. You can do this via the AWS Management Console or using the AWS CLI:

aws lambda update-function-configuration --function-name --vpc-config SubnetIds=,SecurityGroupIds=

Replace <your-function-name>, <correct-subnet-id>, and <your-security-group-id> with your actual function name, subnet ID, and security group ID respectively.

Conclusion

By following these steps, you should be able to resolve the InvalidSubnetIDException and successfully deploy your AWS Lambda function. For more information on configuring AWS Lambda with VPC, refer to the AWS Lambda VPC Configuration Documentation.

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