PolarDB:Change the VPC and vSwitch

If your ECS instance and the PolarDB cluster are not in the same VPC, they cannot communicate over private networks. To ensure optimal performance of the PolarDB cluster, make sure that the PolarDB cluster and the ECS instance are in the same VPC so that they can communicate over private networks.

Prerequisites

Your cluster must meet the following requirements:

• When you create the cluster, Database Edition is set to Enterprise Edition and Edition is set to Cluster Edition.

• Billing Method is set to Subscription or Pay-as-you-go.

Usage notes

• Take the following considerations into account when you change the VPC and vSwitch:

  • A transient connection that lasts for approximately 30 seconds occurs. We recommend that you perform the switchover during off-peak hours and make sure that your applications are configured to automatically reconnect to the database service.

  • After the VPC and vSwitch are changed, the old endpoint information may remain in the Domain Name System (DNS) cache before the entries expires. During this time, you may fail to connect to the cluster. Restart the application or refresh the DNS cache of the host where the application resides to resolve this issue.

  • This operation interrupts the connection between your cluster and Data Management (DMS) or the connection between your cluster and Data Transmission Service (DTS) for a short period of time. After your cluster is connected to the new VPC and vSwitch, the connection is automatically resumed.

• When you change the VPC and vSwitch, you can choose whether to change the VPCs and vSwitches of all endpoints:

  • If you select No for Existing Endpoint Switching, only the default VPC and default vSwitch of the cluster are changed. The VPCs and vSwitches of existing endpoints are not changed.

  • If you select Yes for Existing Endpoint Switching, the default VPC and default vSwitch of the cluster are changed. The VPCs and vSwitches of existing endpoints are also changed.

  Note

  The default VPC and default vSwitch are automatically selected when you create a custom endpoint.

Change the default VPC and default vSwitch

1. Log on to the PolarDB console. In the left-side navigation pane, click Clusters. In the upper-left corner of the page, select the region in which the cluster resides and click the ID of the cluster to go to the Basic Information page.

2. On the Basic Information page, click Switch next to Default VPC. In the Switch VPC dialog box, select the VPC and vSwitch to which you want to change.

   Important

   If you select No for Existing Endpoint Switching, the VPCs and vSwitches of existing endpoints are not changed.

   

Change the VPC and vSwitch of a custom endpoint

1. Log on to the PolarDB console. In the left-side navigation pane, click Clusters. In the upper-left corner of the page, select the region in which the cluster resides and click the ID of the cluster to go to the Basic Information page.

2. In the Database Connections section, select a custom endpoint. In the Modify Endpoint Settings dialog box, choose More > Edit.

3. In the Modify Private Endpoint dialog box, select the VPC and vSwitch.

   

Specify the VPC and vSwitch when you create a custom endpoint

1. Log on to the PolarDB console. In the left-side navigation pane, click Clusters. In the upper-left corner of the page, select the region in which the cluster resides and click the ID of the cluster to go to the Basic Information page.

2. In the Database Connections section, click Create Custom Cluster Endpoint. In the Create Custom Cluster Endpoint dialog box, select the VPC and vSwitch.

   Important

   When you create a custom endpoint, the default VPC and default vSwitch of the cluster are selected by default. If the default VPC and default vSwitch are not selected, the default VPC and default vSwitch of the cluster are changed after the custom endpoint is created.