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    Regions and Availability Zones

    Last updated: 2023-05-06 19:41:07
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      Regions

      Overview

      A region is the physical location of an IDC. In Tencent Cloud, regions are fully isolated from each other, ensuring cross-region stability and fault tolerance. We recommend that you choose the region closest to your end users to minimize access latency and improve access speed.
      You can view the following table or use the DescribeRegions API to get a complete region list.

      Characteristics

      The networks of different regions are fully isolated. Tencent Cloud services in different regions cannot communicate via a private network by default.
      Tencent Cloud services in different regions can communicate with each other through public IPs over the internet, while those in different VPCs can communicate with each other through Cloud Connect Network, which is faster and more stable.
      Cloud Load Balancer currently supports intra-region traffic forwarding and being bound to CVM instances in the same region by default. If you enable the cross-region binding feature, a CLB instance can be bound to CVM instances in another region.

      Availability Zones

      Overview

      An availability zone (AZ) is a physical IDC of Tencent Cloud with independent power supply and network in the same region. It can ensure business stability, as failures (except for major disasters or power failures) in one AZ are isolated without affecting other AZs in the same region. By starting an instance in an independent availability zone, users can protect their applications from being affected by a single point of failure. You can view the following table or use the DescribeZones API to get a complete availability zone list.

      Characteristics

      Tencent Cloud services in the same VPC are interconnected via the private network, which means they can communicate using private IPs, even if they are in different availability zones of the same region.
      Note
      Private network interconnection refers to the interconnection of resources under the same account. Resources under different accounts are completely isolated on the private network.

      China

      Region
      Availability Zone
      South China (Guangzhou)
      ap-guangzhou
      Guangzhou Zone 1 (Sold out)
      ap-guangzhou-1
      Guangzhou Zone 2 (Sold out)
      ap-guangzhou-2
      Guangzhou Zone 3
      ap-guangzhou-3
      Guangzhou Zone 4
      ap-guangzhou-4
      Guangzhou Zone 6
      ap-guangzhou-6
      Guangzhou Zone 7
      ap-guangzhou-7
      East China (Shanghai)
      ap-shanghai
      Shanghai Zone 1 (Sold out)
      ap-shanghai-1
      Shanghai Zone 2
      ap-shanghai-2
      Shanghai Zone 3
      ap-shanghai-3
      Shanghai Zone 4
      ap-shanghai-4
      Shanghai Zone 5
      ap-shanghai-5
      Shanghai Zone 8
      ap-shanghai-8
      East China (Nanjing)
      ap-nanjing
      Nanjing Zone 1
      ap-nanjing-1
      Nanjing Zone 2
      ap-nanjing-2
      Nanjing Zone 3
      ap-nanjing-3
      North China (Beijing)
      ap-beijing
      Beijing Zone 1 (Sold out)
      ap-beijing-1
      Beijing Zone 2
      ap-beijing-2
      Beijing Zone 3
      ap-beijing-3
      Beijing Zone 4
      ap-beijing-4
      Beijing Zone 5
      ap-beijing-5
      Beijing Zone 6
      ap-beijing-6
      Beijing Zone 7
      ap-beijing-7
      Southwest (Chengdu)
      ap-chengdu
      Chengdu Zone 1
      ap-chengdu-1
      Chengdu Zone 2
      ap-chengdu-2
      Southwest (Chongqing)
      ap-chongqing
      Chongqing Zone 1
      ap-chongqing-1
      Hong Kong/Macao/Taiwan (Hong Kong, China)
      ap-hongkong
      Hong Kong Zone 1 (Nodes in Hong Kong, China can cover services in Hong Kong/Macao/Taiwan regions) (Sold out)
      ap-hongkong-1
      Hong Kong Zone 2 (Nodes in Hong Kong, China can cover services in Hong Kong/Macao/Taiwan)
      ap-hongkong-2
      Hong Kong Zone 3 (Nodes in Hong Kong, China can cover services in Hong Kong/Macao/Taiwan)
      ap-hongkong-3
      Note:
      The product is in beta test for Jinan, Hangzhou, Fuzhou, Wuhan, Changsha, and Shijiazhuang regions. To try it out, contact the sales rep for application.

      Other Countries and Regions

      Region
      Availability Zone
      Southeast Asia Pacific (Singapore)
      ap-singapore
      Singapore Zone 1 (Singapore nodes cover services in Southeast Asia)
      ap-singapore-1
      Singapore Zone 2 (Singapore nodes cover services in Southeast Asia)
      ap-singapore-2
      Singapore Zone 3 (Singapore nodes cover services in Southeast Asia)
      ap-singapore-3
      Singapore Zone 4 (Singapore nodes cover services in Southeast Asia)
      ap-singapore-4
      Southeast Asia (Jakarta)
      ap-jakarta
      Jakarta Zone 1 (Jakarta nodes cover services in Southeast Asia)
      ap-jakarta-1
      Jakarta Zone 2 (Jakarta nodes cover services in Southeast Asia)
      ap-jakarta-2
      Northeast Asia (Seoul)
      ap-seoul
      Seoul Zone 1 (Seoul nodes cover services in Northeast Asia)
      ap-seoul-1
      Seoul Zone 2 (Seoul nodes cover services in Northeast Asia)
      ap-seoul-2
      Northeast Asia (Tokyo)
      ap-tokyo
      Tokyo Zone 1 (Tokyo nodes cover services in Northeast Asia)
      ap-tokyo-1
      Tokyo Zone 2 (Tokyo node AZs cover services in Northeast Asia)
      ap-tokyo-2
      Southern Asia Pacific (Mumbai)
      ap-mumbai
      Mumbai Zone 1 (Mumbai nodes cover services in South Asia)
      ap-mumbai-1
      Mumbai Zone 2 (Mumbai nodes cover services in South Asia)
      ap-mumbai-2
      Southeast Asia Pacific (Bangkok)
      ap-bangkok
      Bangkok Zone 1 (Bangkok nodes cover services in Southeast Asia)
      ap-bangkok-1
      Bangkok Zone 2 (Bangkok nodes cover services in Southeast Asia)
      ap-bangkok-1
      North America (Toronto)
      na-toronto
      Toronto Zone 1 (Toronto nodes cover services in North America)
      na-toronto-1
      South America (São Paulo)
      sa-saopaulo
      São Paulo Zone 1 (São Paulo nodes cover services in South America)
      sa-saopaulo-1
      West US (Silicon Valley)
      na-siliconvalley
      Silicon Valley Zone 1 (Silicon Valley nodes cover services in West US)
      na-siliconvalley-1
      Silicon Valley Zone 2 (Silicon Valley nodes cover services in West US)
      na-siliconvalley-2
      East US (Virginia)
      na-ashburn
      Virginia Zone 1 (Virginia nodes cover services in East US)
      na-ashburn-1
      Virginia Zone 2 (Virginia nodes cover services in East US)
      na-ashburn-2
      Europe (Frankfurt)
      eu-frankfurt
      Frankfurt Zone 1 (Frankfurt nodes cover services in Europe)
      eu-frankfurt-1
      Frankfurt Zone 2 (Frankfurt nodes cover services in Europe)
      eu-frankfurt-2

      How to Select Regions and Availability Zones

      When selecting a region and availability zone, take the following into consideration:
      Your location, the location of your users, and the region of the CVM instances. We recommend that you choose the region closest to your end users when purchasing CVM instances to minimize access latency and improve access speed.
      Other Tencent Cloud services you use. When you select other Tencent Cloud services, we recommend you try to locate them all in the same region and availability zone to allow them to communicate with each other through the private network, reducing access latency and increasing access speed.
      High availability and disaster recovery. Even if you have just one VPC, we still recommend that you deploy your businesses in different availability zones to prevent a single point of failure and enable cross-AZ disaster recovery.
      There may be network latency among different availability zones. We recommend that you assess your business requirements and find the optimal balance between high availability and low latency.
      If you need access to servers in other countries or regions, we recommend that you select an instance in those other countries or regions. If you use a CVM instance in China to access servers in other countries or regions, you may encounter much higher network latency.

      Resource Availability

      The following table describes which Tencent Cloud resources are global, which are regional, and which are specific to availability zones.
      Resource
      Resource ID Format
      (8-Digit String of Numbers and Letters)
      Type
      Description
      User account
      Unlimited
      Globally unique
      Users can use the same account to access Tencent Cloud resources around the world.
      skey-xxxxxxxx
      Global
      Users can use an SSH key to bind a CVM in any region under the account.
      ins-xxxxxxxx
      Available in a single availability zone of a region
      CVM instances can only be created in a specific availability zone.
      img-xxxxxxxx
      Available in multiple availability zones of a region
      Custom images created for the instance are available to all availability zones of the same region. Use Copy Image to copy a custom image if you need to use it in other regions.
      eip-xxxxxxxx
      Available in multiple availability zones of a region
      EIPs can only be associated with instances in the same region.
      sg-xxxxxxxx
      Available in multiple availability zones of a region
      Security groups can only be associated with instances in the same region. Tencent Cloud automatically creates three default security groups for users.
      disk-xxxxxxxx
      Available in a single availability zone of a region
      Users can only create a Cloud Block Storage disk in a specific availability zone and attach it to instances in the same availability zone.
      snap-xxxxxxxx
      Available in multiple availability zones of a region
      A snapshot created from a cloud disk can be used for other purposes (such as creating cloud disks) in this region.
      clb-xxxxxxxx
      Available in multiple availability zones of a region
      Cloud Load Balancer can be bound with CVMs in different availability zones of a single region for traffic forwarding.
      vpc-xxxxxxxx
      Available in multiple availability zones of a region
      A VPC in one region can have resources created in different availability zones of the region.
      subnet-xxxxxxxx
      Available in a single availability zone of a region
      Users cannot create subnets across availability zones.
      rtb-xxxxxxxx
      Available in multiple availability zones of a region
      When creating a route table, users need to specify a VPC. Therefore, route tables are regional as well.

      Related Operations

      Migrating an instance to another availability zone

      Once launched, an instance cannot be migrated to another availability zone. However, you can create a custom image of the CVM instance and use the image to launch or update an instance in a different availability zone.
      1. Create a custom image for the current instance. For more information, see Creating a Custom Image.
      2. If the instance is on a VPC network environment and you want to retain its current private IP address after the migration, first delete the subnet in the current availability zone and then create a subnet in the new availability zone with the same IP address range. Note that a subnet can be deleted only when it contains no available instances. Therefore, all the instances in the current subnet should be migrated to the new subnet.
      3. Create a new instance in the new availability zone by using the custom image you have just created. You can choose the same type and configuration as the original instance, or choose new settings. For more information, see Creating Instances via CVM Purchase Page.
      4. If an elastic IP is associated with the original instance, dissociate it from the old instance and associate it with the new instance. For more information, see EIPs.
      5. (Optional) If the original instance is pay-as-you-go, you can choose to terminate it. For more information, see Terminating Instances.

      Copying images to other regions

      Operations such as launching and viewing instances are region-specific. If the image of the instance that you need to launch does not exist in the region, copy the image to the desired region. For more information, see Copying Images.
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