Binding and Unbinding an EIP

Scenarios

You can bind an EIP to your DB instance to enable public network access and can unbind the EIP later if it is not 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 5432, ensure that the security group allows access over the 5432 port.

Precautions

• You need to configure security groups and enable specific IP addresses and ports to access the target DB instance. Before accessing the DB instance, add an individual IP address or an IP address range that will access the DB instance to the inbound rule. For details, see Configuring a Security Group Rule.
• 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 DB instance.

Prerequisites

• You can bind an EIP to a primary DB instance or a read replica only.
• If a DB instance has already an EIP bound, 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 instance name to go to the Overview page.
4. In the navigation pane on the left, choose Connectivity & Security. In the Connection Information area, click Bind next to the EIP field.
5. In the displayed dialog box, all unbound EIPs are listed. Select the EIP to be bound and click Yes. If no available EIPs are displayed, click View EIP and obtain an EIP.
6. On the Connectivity & Security page, check 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 to go to the Overview page.
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.
5. On the Connectivity & Security page, check the result.

   You can also view the progress and result 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.