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CVM Access to COS via a Private Network

Last updated: 2022-02-17 17:04:27

    This document describes the COS access methods and the way to determine a private network access. It also provides the connectivity test sample to help you learn more about CVM access to COS.

    Access Methods

    If you have deployed a service in Tencent Cloud to access COS, different access modes apply to as follows:

    • Intra-region access: access within the same region will be automatically directed to a private network address. A private network connection is automatically used, incurring no traffic fees. Therefore, we recommend choosing the same region when you purchase different Tencent Cloud products to save on costs.
    • Cross-region access: currently, cross-region requests do not support private network access and will be resolved to a public network address by default.

    Determining a Private Network Access

    To determine whether a CVM accesses COS via a private network, perform the following steps.
    Run the nslookup command on the CVM to resolve the COS domain name. If a private IP is returned, the access is over a private network; otherwise, it is over a public network.

    1. Obtain and record the bucket access domain as instructed in Bucket Overview.
    2. Log in to the CVM instance and run the nslookup command. Assume that examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com is the address of the destination bucket, run the following command.
      nslookup examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com

    In the command output, the and IPs indicate that the access to COS is over a private network.


    Generally, a private IP takes the form of 10.*.*.* or 100.*.*.*, and a VPC IP takes the form of 169.254.*.*. These two types of IPs indicate a private network access.

    Test Connectivity

    See the “Testing connectivity” section in Request Creation Overview for the COS access samples through a public network, access through Tencent Cloud CVMs (classic network) within the same region and access through Tencent Cloud CVMs (VPC) within the same region.

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