I'm trying to connect AWS Lambda to an AWS RDS instance, but I'm struggling to find a way to do this without incurring costs. Every time I try to make RDS accessible, I end up needing to make it publicly accessible, which brings in VPC charges. I've added Lambda to the same VPC, but that hasn't worked out either. I've even explored options like SSM. Is there a completely free method to make this setup work? Just to note, I'm using the AWS Free Tier.
3 Answers
Lambda can work well within the same VPC as your RDS instance, which is a common setup. However, you might run into issues if you're using specific types of authentication that require internet access, like needing a NAT Gateway for API calls. Make sure your Lambda permissions and networking settings are correct. If you still have issues, check your Lambda function’s VPC settings.
If you're looking to save on networking costs, have you considered using Aurora Serverless with the Data API? It can be a cost-effective way to connect without incurring those network expenses.
Using the AWS Free Tier is tricky because even though some services are free, others can come with costs under certain usage conditions. It's generally safer to keep your RDS instance private rather than making it publicly accessible. You can definitely set up your Lambda function in a private subnet with the RDS instance, which might help you avoid those VPC costs.
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