What Should I Do If an ECS Cannot Connect to a GaussDB(for MySQL) DB Instance?¶
Perform the following steps to identify the problem:
Check whether the ECS and GaussDB(for MySQL) DB instance are located in the same VPC.
If they are in the same VPC, go to 2.
If they are in different VPCs, create an ECS in the VPC where the DB instance is located.
Check whether a security group has been created for the ECS.
If a security group has been created, check whether its configuration rules are suitable.
For details, see security group description in Step 1: Create a DB Instance. Then, go to 3.
If no security group has been created, go to the VPC console from the ECS details page and create a security group.
Check whether the ECS can connect to the DB instance over the instance port.
The default port of the DB instance is 3306.
telnet <IP address> {Port number}
If the ECS can connect to the DB instance port, the network between the ECS and the DB instance is normal.
If the ECS cannot connect to the DB instance port, contact technical support.