无法通过AWS EC2实例使用PHP连接到AWS MYSQL RDS实例

Question

Hi I am trying to connect to Amazon Web Services MYSQL RDS Instance using PHP code stored in AWS EC2 instance. My AWS EC2 instance is connected properly and i have installed Apache, PHP and MYSQL using PuTTY SSH Client. However, when I execute my PHP code from browser, I get following error:

ec2-.....compute.amazonaws.com (EC2 Public DNS) is currently unable to handle this request.
HTTP ERROR 500

Here is my PHP code:

NOTE: I have used AWS MYSQL RDS instance endpoint(without port number) as "DB_SERVER", master username and master password of AWS MYSQL RDS instance. I have stored my PHP file in /var/www/html.

Can anyone tell me why I am unable to connect to my AWS MYSQL RDS instance via AWS EC2 instance???

Answer 1

This type of issues is alot easier to debug if you separate the different components that could be at fault here. First try to connect to the RDS instance using a mysql shell on the EC2 instance, and after you make sure it works - proceed to debug your PHP code.

Instructions for connecting to RDS can be found here - http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ConnectToInstance.html

Answer 2

I would start by testing the connection on the command line:

mysql -h *cluster end point* -P 3306 -u *username* -p *password*

Verify that the cluster end point in your AWS RDS page is authorized

Or make sure the security group used allows the connection to the cluster.