AWS Lambda RDS connection timeout

Question

I\'m trying to write a Lambda function using Node.js which connects to my RDS database. The database is working and accessible from my Elastic Beanstalk environment. When I

Answer 1

When you originally setup the DB, it will automatically create a security group. defaulting to the IP that you set the DB up with. When you run from lambda this rule blocks traffic. Check out your db error logs and you can confirm it is refusing the connection.

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You need to create a rule in the security group to allow lambda traffic. Go to your RDS instance console and click on the security group, select inbound. There you will see the rules. Then make the call to open up to the world, find the AWS lambda IPs or create a VPC.