无法连接到远程mysql服务器aws

Question

I woke up this morning and my frontend server could no longer connect to my mysql server. I have no idea why:

The internal ip of my frontend server is 172.31.XX .

My db server is configured with firewall inbound rules that allow tcp connections on port 3306 via source 172.31.0.0/16

My frontend server is configured with firewall outbound rules that allow tcp connections on port 3306 to the internal ip address of my db server.

The mysql user I use is mysql_prod . These are the privileges I have granted for that user on the db server:

mysql> show grants for mysql_prod;

+--------------------------------------------------------------------------------------------------------------------+ | Grants for mysql_prod@% | +--------------------------------------------------------------------------------------------------------------------+

| GRANT ALL PRIVILEGES ON . TO 'mysql_prod'@'%' IDENTIFIED BY PASSWORD '*5B761DF55A90C1E168EC63A3B074A607ECC3B2CA' |

| GRANT ALL PRIVILEGES ON wordpress .* TO 'mysql_prod'@'%' |

What am I missing?

Answer 1

The issue occurred because the mysql bind-address was set to localhost, which prevented remote connections. I'm not too sure how this conf got reset (the app was working fine the night before). Anyways, once I fixed it, it was working fine.