Help Center > > Getting Started> Getting Started with RDS for MySQL> Connecting to a DB Instance Through a Private Network> Step 3: Connect to a DB Instance Through a Private Network

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

Updated at: May 26, 2020 GMT+08:00

You can connect to a DB instance through a common connection or an SSL connection. The SSL connection encrypts data and is more secure.

Prerequisites

  1. Log in to the ECS.
    • For details on how to create and log in to an ECS, see Purchasing an ECS and Logging In to an ECS.

    • To connect to a DB instance through an ECS, you must ensure that:
      • The ECS and DB instance must be in the same VPC and subnet.
      • 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. For details, see section Step 2: Configure Security Group 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. The ECS must be allowed by the security group to access RDS DB instances.

  2. Use a database client to connect to the target DB instance.

    You can use a database client to connect to the target DB instance in the Linux or Windows OS.

    • In the Linux OS, install the MySQL client on the device that can access RDS. It is recommended that you download a MySQL client running a version later than that of the DB instance.

      For details about how to obtain and install the MySQL client, see How Can I Install the MySQL Client?

Using MySQL-Front to Connect to a DB Instance

  1. Start MySQL-Front.
  2. In the displayed dialog box, click New.

    Figure 1 Connection management

  3. Enter the information of the target DB instance to be connected and click Ok, as shown in Figure 2.

    Figure 2 Adding an account
    Table 1 Parameter description

    Parameter

    Description

    Name

    Indicates the name of the database connection task. If you do not set this parameter, it will be the same as Host by default.

    Host

    Indicates the floating IP address of the DB instance to be connected. To view the floating IP address and port of the DB instance, perform the following steps:
    1. Log in to the RDS console.
    2. Select the region in which the DB instance is located.
    3. Click the target DB instance to enter the Basic Information page.
    4. In the Connection Information area, view the floating IP address.

    Port

    Indicates the private network port of the DB instance.

    User

    Indicates the name of the user who will access the DB instance. The default user is root.

    Password

    Indicates the password of the RDS database account.

  4. In the displayed window, select the connection that you have created in 3 and click Open. If the connection information is correct, the DB instance is successfully connected.

    Figure 3 Opening a session

SSL Connection

  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 RDS. The RDS console is displayed.
  4. In the DB Information area on the Basic Information page, click in the SSL field to download the root certificate or certificate bundle.
  5. Import the root certificate to the Linux OS on the ECS. For details, see How Can I Import the Root Certificate to the Windows or Linux OS?

    • Since April 2017, RDS has offered a new root certificate that has a 20-year validation period. The new certificate takes effect after DB instances are rebooted. Replace the old certificate before it expires to improve system security.

      For details, see How Can I Identify the Validity Period of the SSL Root Certificate?

    • You can also download the certificate bundle, which contains both the new certificate provided since April 2017 and the old certificate.

  6. Run the following command to connect to an RDS DB instance. The Linux OS is used as an example.

    mysql -h <hostName> -P <port> -u <userName> -p --ssl-ca=<caName>

    Table 2 Parameter description

    Parameter

    Description

    <hostName>

    Indicates the floating IP address. To obtain this parameter, go to the Basic Information page of the DB instance and view the floating IP address in the Connection Information area.

    <port>

    Indicates the database port. By default, the value is 3306. To obtain this parameter, go to the Basic Information page of the DB instance and view the database port in the Connection Information area.

    <userName>

    Indicates the username of the RDS database account. The default administrator is root.

    <caName>

    Indicates the name of the SSL certificate file, which should be stored in the same directory where the command is executed.

    For example, to connect to a DB instance through an SSL connection as user root, run the following command:

    mysql -h 172.16.0.31 -P 3306 -u root -p --ssl-ca=ca.pem

    Enter the password of the database account if the following information is displayed:

    Enter password:

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