World of *Nix

For our office products, we are using Amazon Cloud. For the database, we prefer to use Amazon RDS (Aurora). Recently one of our sites was showing lots of error message in sentry.io. The error log shows it was because of MySQL denied to connect for too many open connections. This is when we checked the RDS max_connection limit and found its related to the size of your RDS instance. So we tested the max_connection limit for different size instances. And here is the result:

t2.small:

t2.medium:

r3.large:

r3.xlarge:

r3.2xlarge:

r3.4xlarge:

r3.8xlarge: