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Help Center/ Domain Name Service/ FAQs/ Private Zones/ How Do I Change Default DNS Servers of an ECS to Huawei Cloud Private DNS Servers?

How Do I Change Default DNS Servers of an ECS to Huawei Cloud Private DNS Servers?

Updated on 2025-02-10 GMT+08:00

Huawei Cloud provides private DNS servers for domain name resolution in VPCs. ECSs use public domain names to access the Internet, but use private domain names to access cloud services like OBS and SMN, with no need to connect to the Internet.

For the ECSs that are created before private DNS is available, public recursive DNS server addresses (for example, 114.114.114.114) are configured for VPC subnets of the ECSs by default. To allow ECSs on these subnets to use private domain names, change the default public recursive DNS server addresses to those of Huawei Cloud private DNS servers. For details about private DNS servers, see What Are Huawei Cloud Private DNS Server Addresses?

Viewing the DNS Server Addresses for an ECS

  1. Log in to the management console.
  2. Choose Computing > Elastic Cloud Server.

    The Elastic Cloud Server page is displayed.

  3. In the ECS list, click the name of the target ECS.
  4. On the ECS details page, click the VPC name.

    The Virtual Private Cloud page is displayed.

  5. Locate the VPC and click the number in the Subnets column.

    The Subnets page is displayed.

  6. Click the name of the subnet.

    In the Gateway and DNS Information area, view the DNS server addresses used by the ECS.

Changing the DNS Server Addresses for a VPC Subnet

If the DNS servers for the ECS are not those provided by Huawei Cloud DNS, change them to Huawei Cloud private DNS servers.

  1. In the Gateway and DNS Information area, click next to DNS Server Address.
  2. Change the DNS server addresses to private DNS server addresses.

Synchronizing the DNS Server Addresses for the ECS

New DNS server addresses will take effect after they are updated. There are two ways to do this:
  • Restart the OS. The ECS will then obtain the new DNS server addresses from the DHCP server.
    NOTICE:

    Restarting the OS will interrupt services on the ECS. Perform this operation during off-peak hours.

    Alternatively, wait for the DHCP lease to expire, which is 365 days by default. After the lease time expires, the DHCP server allocates another IP address and updates the DNS server addresses to the ECS.

  • Manually change the DNS settings on the ECS.

    If DHCP is disabled on the ECS, manually update DNS settings.

    For example, if the ECS is running Linux, change the DNS settings by editing the /etc/resolv.conf file.

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