Binding and Unbinding an EIP

Scenarios

By default, a DB instance is not publicly accessible (not bound with an EIP) after being created. You can bind an EIP to a DB instance for public accessibility, and you can unbind the EIP from the DB instance later if needed.

To ensure that the DB instance is accessible, the security group associated with the instance must allow access over the database port. For example, if the database port is 8635, ensure that the security group allows access over the 8635 port.

Precautions

• To bind an EIP to your DB instance, you need to contact customer service to apply for required permissions.
• Public accessibility reduces the security of DB instances. Therefore, exercise caution when deciding to connect to your instance through a public network. To achieve a higher transmission rate and security level, you are advised to migrate your applications to an ECS that is in the same region as your RDS instance.

Prerequisites

• You can bind an EIP to a primary DB instance or a read replica only.
• If a DB instance has already been bound with an EIP, you must unbind the EIP from the DB instance first before binding a new EIP to it.

Binding an EIP

1. Log in to the management console.
2. Click in the upper left corner of the page and choose Databases > Relational Database Service.
3. On the Instances page, click the target DB instance.
4. In the navigation pane on the left, choose Connectivity & Security. In the Connection Information area, click Bind next to the EIP field.

   Alternatively, in the Connection Topology area, click Public Connection and then Bind above the connection topology.

5. In the displayed dialog box, all unbound EIPs are listed. Select the EIP to be bound and click Yes.
6. On the Connectivity & Security page, view the EIP that has been bound to the DB instance.

   You can also view the progress and result of binding an EIP to a DB instance on the Task Center page.

   To unbind the EIP from the DB instance, see Unbinding an EIP.

Unbinding an EIP

1. Log in to the management console.
2. Click in the upper left corner of the page and choose Databases > Relational Database Service.
3. On the Instances page, click the DB instance that has an EIP bound.
4. In the navigation pane on the left, choose Connectivity & Security. In the Connection Information area, click Unbind next to the EIP field. In the displayed dialog box, click Yes.

   Alternatively, in the Connection Topology area, click Public Connection and then Unbind above the connection topology. In the displayed dialog box, click Yes.

5. On the Connectivity & Security page, view the results.

   You can also view the progress or the results of unbinding an EIP from a DB instance on the Task Center page.

   To bind an EIP to the DB instance again, see Binding an EIP.