Regions and Availability Zones

Last updated: 2021-01-22 14:56:56

    Regions

    Overview

    A region is the physical location of an IDC. In Tencent Cloud, different regions are fully isolated, ensuring cross-region maximum stability and fault tolerance. To reduce access latency and increase download speeds, we recommend you select the region nearest to your end users.

    You can view the following table or use the DescribeRegions API to get a complete list of regions.

    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 across regions can communicate with each other through public IPs over the Internet, while those in different VPCs can communicate with each other through CCN that is faster and steadier.
    • Cloud Load Balancer currently supports intra-region traffic forwarding by default. If the cross-region binding feature is enabled, a CLB instance can be bound to CVM instances in another region.

    Availability Zones

    Overview

    An availability zone is a physical IDC of Tencent Cloud with independent power supply and network resource in a single region. It can ensure business stability, as failures (except for large-scale disaster or major power failure) 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 list of availability zones.

    Characteristics

    Tencent Cloud services in the same VPC are interconnected through the private network, meaning they can communicate using private IPs, even if they are in different availability zones.

    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
    East China (Shanghai)
    ap-shanghai
    Shanghai Zone 1
    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
    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
    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 China (Chengdu)
    ap-chengdu
    Chengdu Zone 1
    ap-chengdu-1
    Chengdu Zone 2
    ap-chengdu-2
    Southwest China (Chongqing)
    ap-chongqing
    Chongqing Zone 1
    ap-chongqing-1
    Hong Kong/Macao/Taiwan (Hong Kong, China)
    ap-hongkong
    Hong Kong Zone 1 (Hong Kong nodes cover services in the Hong Kong, Macao, and Taiwan regions of China)
    ap-hongkong-1
    Hong Kong Zone 2 (Hong Kong nodes cover services in the Hong Kong, Macao, and Taiwan regions of China)
    ap-hongkong-2

    Other Countries and Regions

    Region Availability Zone
    Southeast Asia (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
    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
    South Asia (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 (Bangkok)
    ap-bangkok
    Bangkok Zone 1 (Bangkok nodes cover services in Southeast Asia)
    ap-bangkok-1
    North America (Toronto)
    na-toronto
    Toronto Zone 1 (Tokyo nodes cover services in North America)
    na-toronto-1
    Western US (Silicon Valley)
    na-siliconvalley
    Silicon Valley Zone 1 (Silicon Valley nodes cover services in Western US)
    na-siliconvalley-1
    Silicon Valley Zone 2 (Silicon Valley nodes cover services in Western US)
    na-siliconvalley-2
    Eastern US (Virginia)
    na-ashburn
    Virginia Zone 1 (Virginia nodes cover services in Eastern US)
    na-ashburn-1
    Virginia Zone 2 (Virginia nodes cover services in Eastern US)
    na-ashburn-2
    Europe (Frankfurt)
    eu-frankfurt
    Frankfurt Zone 1 (Frankfurt nodes cover services in Europe)
    eu-frankfurt-1
    Europe (Moscow)
    eu-moscow
    Moscow Zone 1 (Moscow nodes cover services Europe)
    eu-moscow-1

    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 users when making the CVM purchase decision to minimize access latency and improve access speed.
    • Other Tencent Cloud services you use.
      We recommend that, when you select other Tencent Cloud products, 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 speeds.
    • 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 higher 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 CVM instances in other countries or regions, we recommend you select a CVM in those countries or regions. If you use a CVM instance in China to access servers in other countries and regions, there may be higher access latency.

    Resource Availability

    The following table describes which Tencent Cloud resources are global, which are regional, and which are specific to availability zones.

    ResourceResource ID Format
    8-Digit String of Numbers and Characters
    TypeDescription
    User Account No limit Globally unique Users can use the same account to access Tencent Cloud resources from around the world.
    SSH Keys skey-xxxxxxxx Global Users can use an SSH key to bind a CVM in any region under the account.
    CVM Instances ins-xxxxxxxx Specific to an availability zone A CVM instance created in an availability zone is not available to other availability zones.
    Custom Images img-xxxxxxxx Regional Custom images created for the instance are available to all availability zones of the same region. Use the cross-region replication feature to copy a custom image if you need to use it in other regions.
    Elastic IPs eip-xxxxxxxx Regional EIPs can only be associated with instances in the same region.
    Security Groups sg-xxxxxxxx Regional Security Group can only be associated with instances in the same region. Tencent Cloud automatically creates three default security groups for users.
    Cloud Block Storage disk-xxxxxxxx Specific to an availability zone Users can only create a cloud disk in a specific availability zone and mount it to instances in the same availability zone.
    Snapshots snap-xxxxxxxx Regional A snapshot created from a cloud disk can be used for other purposes (such as creating cloud disks) in this region.
    Cloud Load Balancer clb-xxxxxxxx Regional Cloud Load Balancer can be bound with CVMs in different availability zones of a single region for traffic forwarding.
    VPC vpc-xxxxxxxx Regional A VPC in one region can have resources created in different availability zones.
    Subnets subnet-xxxxxxxx Specific to an availability zone Users cannot create subnets across availability zones.
    Route Tables rtb-xxxxxxxx Regional When creating a route table, users need to specify a VPC. Therefore, route tables are regional as well.

    Relevant Operations

    Migrating an instance to another availability zone

    Once launched, an instance cannot be migrated. However, you can create a custom image of your CVM instance and use the image to launch or update an instance in a different availability zone.

    1. Create a custom image from the current instance. For more information, see Creating Custom Images.
    2. If the network environment of the current instance is VPC and the private IP address needs to be retained after migration, you need to delete the subnet in the current availability zone and then create a subnet in the new availability zone with the same IP address range as that of the original subnet. Note that a subnet can be deleted only when it does not contain 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 instance type and configuration as that of the original instance, or choose new configurations. 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 Elastic IP (EIP).
    5. (Optional) If the instance billing mode of the original instance is pay-as-you-go, you can 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, the image needs to be copied to the desired region. For more information, see Copying Images.

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