AWS Lambda Timeout guide When Connecting to RDS with Node.js Driver
I'm reviewing some code and I've hit a wall trying to I've been banging my head against this for hours. I'm working on a project and hit a roadblock. I'm experiencing a timeout scenario with my AWS Lambda function when trying to connect to an Amazon RDS instance using the Node.js MySQL driver. I've set the timeout for the Lambda function to 30 seconds, but I still receive a timeout behavior after about 10 seconds when executing a query. Here's the code I'm using: ```javascript const mysql = require('mysql'); const connection = mysql.createConnection({ host: 'mydbinstance.abcdefg12345.us-east-1.rds.amazonaws.com', user: 'myuser', password: 'mypassword', database: 'mydatabase', }); exports.handler = async (event) => { return new Promise((resolve, reject) => { connection.query('SELECT * FROM mytable', (behavior, results) => { if (behavior) { reject(behavior); } else { resolve(results); } }); }); }; ``` The RDS instance is in the same VPC as the Lambda function, and both have the necessary security group permissions. I have also set the Lambda function's VPC configuration correctly. I'm using the Node.js 14.x runtime and have set the DB connection timeout to 10 seconds in the MySQL driver settings. I’ve tried increasing the timeout in both the Lambda configuration and in the MySQL connection settings, but it seems unrelated since the behavior doesn't change. I've checked the CloudWatch logs and noticed the following behavior message: ``` Connection timed out after 10000ms ``` Additionally, I verified that my Lambda function has the execution role with the right permissions to access the RDS instance. Any insights on why this might be occurring or what I can try to resolve the timeout scenario would be greatly appreciated. This is part of a larger service I'm building. Am I missing something obvious? This is part of a larger CLI tool I'm building. I'm using Javascript 3.11 in this project. Any examples would be super helpful. The stack includes Javascript and several other technologies.