Container Registry:Best practices for geo-disaster recovery of Container Registry Enterprise Edition instances

Prerequisites

Container Registry Enterprise Edition instances are created in at least two different regions. For more information, see Create a Container Registry Enterprise Edition instance.

Procedure

Step 1: Configure a custom endpoint for the instances

Configure the same custom endpoint for the instances in different regions and use the custom endpoint to pull container images in the cluster. For more information, see Use a custom domain name to access a Container Registry Enterprise Edition instance.

Step 2: Configure synchronization rules for the instances

Configure image replication rules for instances in different regions to ensure that core business images exist on instances in different regions. For more information, see Replicate images within same account and Replicate images across accounts.

Step 3: Configure access control lists (ACLs) for the instances

• If you want to implement cross-region access over an internal network, you must configure a virtual private cloud (VPC) ACL for the instances. For more information, see Configure a VPC ACL.

  Note

  To implement geo-disaster recovery by pulling images over an internal network, you must establish a connection between the instances and the VPC. You can establish the connection between the instances and the VPC by using Cloud Enterprise Network (CEN). For more information, see Obtain the IP addresses that are used to create routing rules.

• If you want to implement cross-region access over the Internet, you must enable Internet access for the instances. For more information, see Enable Internet access.

Step 4: Modify the Alibaba Cloud DNS (DNS) resolution setting of the source instance to implement geo-disaster recovery

In this example, Instance A is deployed in the China (Hangzhou) region and Instance B is deployed in the China (Zhangjiakou) region. The following table describes the basic information of Instance A.

If you cannot pull images from Instance B or push images to Instance B for some reason, you can modify the Alibaba Cloud DNS PrivateZone resolution settings of the custom endpoint of the VPC that is associated with Instance B. This way, you can pull the synchronized image from Instance A across regions. Perform the following operations:

1. Log on to the Alibaba Cloud DNS console.

2. In the left-side navigation pane, click Private DNS (PrivateZone).

3. On the Built-in Authoritative Module tab, enter the custom endpoint cross-region.registry.io of Instance A and Instance B to search for zones. Two zones are displayed. Click the zone that is associated with the vpc-bbbbb VPC.

4. On the Resource Record Settings tab, find the record that you want to edit and click Edit in the Actions column.

5. In the Modify Record dialog box, configure the parameters. The following tables describe the parameters. Then, click OK.

   • If you want to implement geo-disaster recovery by pulling images over the Internet

     Parameter	Description
     Record Type	Select CNAME from the drop-down list.
     Hostname	Set this parameter to @.
     Record Value	Set this parameter to the public endpoint of Instance A: a-registry.cn-hangzhou.cr.aliyuncs.com.
     TTL	Retain the default value.

   • If you want to implement geo-disaster recovery by pulling images over an Internal network

     Parameter	Description
     Record Type	Select A from the drop-down list.
     Hostname	Set this parameter to @.
     Record Value	Set this parameter to the internal endpoint of Instance A in vpc-aaaaa.
     TTL	Retain the default value.