Step 3: Connect to a DB Instance Through a Private Network

To connect to a DB instance through a private network, you must first create an ECS.

For details about how to create an ECS, see section How Can I Create and Connect to an ECS?

• The ECS and RDS DB instance must be in the same VPC.
• The ECS must be allowed by the security group to access RDS DB instances.
  • If the security group to which the target DB instance belongs is the default security group, you do not need to configure security group rules.
  • If the security group to which the target DB instance belongs is not the default security group, check whether the security group rules allow the ECS to connect to the DB instance.
    1. Log in to the management console.
    2. Click in the upper left corner and select a region and a project.
    3. Click Service List. Under Database, click Relational Database Service. The RDS console is displayed.
    4. On the Instance Management page, click the target DB instance.
    5. In the Connection Information area, click the security group to view its rules.

       If the security group rules allow the access from the ECS, the ECS can connect to the DB instance.

       If the security group rules do not allow the access from the ECS, you need to add a security group rule. For details, see section Step 2: Configure Security Group Rules.

Install the Microsoft SQL Server client on the ECS or device that was prepared in 1.

Figure 1 Connecting to the server

• Server name: indicates the IP address and port of the DB instance. Use a comma (,) to separate them. For example: x.x.x.x,8080.
  • The IP address is the floating IP address in the Connection Information area on the Basic Information page of the DB instance.
  • The port is the database port in the Connection Information area on the Basic Information page of the DB instance.
• Authentication: indicates the authentication mode. Select SQL Server Authentication.
• Login: indicates the RDS database username. The default administrator is rdsuser.
• Password: indicates the password of the RDS database username.

1. In the DB Information area on the Basic Information page, click in the SSL field to download the root certificate or certificate bundle.
2. Upload the root certificate to the ECS or save it to the device to be connected to the DB instance.
3. Import the root certificate into the Windows OS on the ECS. For details, see How Can I Import the Root Certificate to the Windows or Linux OS?
   

   • Replace the old certificate before it expires to improve system security.
   • After you bind an EIP to a DB instance, you must reboot the instance for the SSL connection to take effect.

Figure 2 Connecting to the server

• Server name: indicates the IP address and port of the DB instance. Use a comma (,) to separate them. For example: x.x.x.x,8080.
  • The IP address is the floating IP address in the Connection Information area on the Basic Information page of the DB instance.
  • The port is the database port in the Connection Information area on the Basic Information page of the DB instance.
• Authentication: indicates the authentication mode. Select SQL Server Authentication.
• Login: indicates the RDS database username. The default administrator is rdsuser.
• Password: indicates the password of the RDS database username.