Help Center> Virtual Private Cloud> User Guide> VPC and Subnet> VPC> Creating a VPC
Updated on 2024-03-30 GMT+08:00
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Creating a VPC

Scenarios

A VPC provides an isolated virtual network for ECSs. You can configure and manage the network as required.

You can create a VPC by following the procedure provided in this section. Then, create subnets, security groups, and assign EIPs by following the procedure provided in subsequent sections based on your actual network requirements.

Procedure

  1. Go to the Create VPC page.
  2. On the Create VPC page, set parameters as prompted.

    A default subnet will be created together with a VPC and you can also click Add Subnet to create more subnets for the VPC.

    Figure 1 Creating a VPC and subnet
    Table 1 VPC parameter descriptions

    Parameter

    Description

    Example Value

    Region

    Select the region nearest to you to ensure the lowest latency possible.

    CN-Hong Kong

    Name

    The VPC name.

    The name can contain a maximum of 64 characters, which may consist of letters, digits, underscores (_), hyphens (-), and periods (.). The name cannot contain spaces.

    VPC-test

    IPv4 CIDR Block

    The CIDR block of the VPC. The CIDR block of a subnet can be the same as the CIDR block for the VPC (for a single subnet in the VPC) or a subset of the CIDR block for the VPC (for multiple subnets in the VPC).

    The following CIDR blocks are supported:

    • 10.0.0.0/8-24
    • 172.16.0.0/12-24
    • 192.168.0.0/16-24

    This parameter will be CIDR Block in regions where IPv4/IPv6 dual stack is not supported, and IPv4 CIDR Block if IPv4/IPv6 dual stack is supported.

    192.168.0.0/16

    Enterprise Project

    The enterprise project to which the VPC belongs.

    An enterprise project facilitates project-level management and grouping of cloud resources and users. The name of the default project is default.

    For details about creating and managing enterprise projects, see the Enterprise Management User Guide.

    default

    Tag

    The VPC tag, which consists of a key and value pair. You can add a maximum of 10 tags to each VPC.

    NOTE:

    If your organization has configured tag policies for VPCs, you need to add tags to your VPCs based on the policies. If you add a tag that does not comply with the tag policies, VPCs may fail to be created. Contact your administrator to learn more about tag policies.
    • Key: vpc_key1
    • Value: vpc-01

    Description

    Supplementary information about the VPC. This parameter is optional.

    The VPC description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).

    N/A
    Table 2 Subnet parameter descriptions

    Parameter

    Description

    Example Value

    Name

    The subnet name.

    The name can contain a maximum of 64 characters, which may consist of letters, digits, underscores (_), hyphens (-), and periods (.). The name cannot contain spaces.

    subnet-01

    CIDR Block

    The CIDR block for the subnet. This value must be within the VPC CIDR block.

    This parameter is displayed only in regions where IPv4/IPv6 dual stack is not supported.

    192.168.0.0/24

    IPv4 CIDR Block

    The CIDR block for the subnet. This value must be within the VPC CIDR block.

    This parameter is displayed only in regions where IPv4/IPv6 dual stack is supported.

    192.168.0.0/24

    IPv6 CIDR Block

    Specifies whether to set IPv6 CIDR Block to Enable.

    After the IPv6 function is enabled, the system automatically assigns an IPv6 CIDR block to the created subnet. Currently, the IPv6 CIDR block cannot be customized. IPv6 cannot be disabled after the subnet is created.

    This parameter is displayed only in regions where IPv4/IPv6 dual stack is supported.

    -

    Associated Route Table

    The default route table to which the subnet will be associated. You can change the route table to a custom route table on the Subnets page.

    Default

    Advanced Settings

    Click the drop-down arrow to set advanced settings for the subnet, including Gateway and DNS Server Address.

    Retain the default settings.

    Gateway

    The gateway address of the subnet.

    This IP address is used to communicate with other subnets.

    192.168.0.1

    DNS Server Address

    Huawei Cloud private DNS server addresses are entered by default. This allows ECSs in a VPC to communicate with each other and also access other cloud services using private domain names without exposing their IP addresses to the Internet.

    You can change the default DNS server addresses if needed. This may interrupt your access to cloud services.

    You can also click Reset on the right to restore the DNS server addresses to the default value.

    A maximum of two DNS server IP addresses can be configured. Multiple IP addresses must be separated using commas (,).

    100.125.x.x

    Domain Name

    Enter domain names (), separated with spaces. A maximum of 254 characters are allowed. A domain name can consist of multiple labels (max. 63 characters each).

    To access a domain name, you only need to enter the domain name prefix. ECSs in the subnet automatically match the configured domain name suffix.

    If the domain names are changed, ECSs newly added to this subnet will use the new domain names.

    If an existing ECS in this subnet needs to use the new domain names, restart the ECS or run a command to restart the DHCP Client service or network service.

    NOTE:
    The command for updating the DHCP configuration depends on the ECS OS. The following commands are for your reference.
    • Restart the DHCP Client service: service dhcpd restart
    • Restart the network service: service network restart

    test.com

    DHCP Lease Time
    The period during which a client can use an IP address automatically assigned by the DHCP server. After the lease time expires, a new IP address will be assigned to the client.
    • Limited: Set the DHCP lease time. The unit can be day or hour.
    • Unlimited: The DHCP lease time does not expire.

    After you change the DHCP lease time on the console, the change is applied automatically when the DHCP lease of an instance (such as ECS) is renewed. You can wait for the system to renew the lease or manually renew the lease. Renewing lease will not change the IP address used by the instance. If you want the new lease time to take effect immediately, manually renew the lease or restart the ECS.

    For details, see How Do I Make the Changed DHCP Lease Time of a Subnet Take Effect Immediately?

    -

    NTP Server Address

    The IP address of the NTP server. This parameter is optional.

    You can configure the NTP server IP addresses to be added to the subnet as required. The IP addresses are added in addition to the default NTP server addresses.

    If you do not specify this parameter, no additional NTP server IP addresses will be added.

    Enter a maximum of four valid IP addresses, and separate multiple IP addresses with commas. Each IP address must be unique. If you add or change the NTP server addresses of a subnet, you need to renew the DHCP lease for or restart all the ECSs in the subnet to make the change take effect immediately. If the NTP server addresses have been cleared out, restarting the ECSs will not help. You must renew the DHCP lease for all ECSs to make the change take effect immediately.

    192.168.2.1

    Tag

    The subnet tag, which consists of a key and value pair. You can add a maximum of 10 tags to each subnet.

    NOTE:

    If you have configured tag policies for subnets, you need to add tags to your subnets based on the tag policies. If you add a tag that does not comply with the tag policies, subnets may fail to be created. Contact the administrator to learn more about tag policies.
    • Key: subnet_key1
    • Value: subnet-01

    Description

    Supplementary information about the subnet. This parameter is optional.

    The subnet description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).

    N/A
    Table 3 VPC tag key and value requirements

    Parameter

    Requirements

    Example Value

    Key
    • Cannot be left blank.
    • Must be unique for each VPC and can be the same for different VPCs.
    • Can contain a maximum of 36 characters.
    • Can contain letters, digits, underscores (_), and hyphens (-).

    vpc_key1

    Value
    • Can contain a maximum of 43 characters.
    • Can contain letters, digits, underscores (_), periods (.), and hyphens (-).

    vpc-01
    Table 4 Subnet tag key and value requirements

    Parameter

    Requirements

    Example Value

    Key
    • Cannot be left blank.
    • Must be unique for each subnet.
    • Can contain a maximum of 36 characters.
    • Can contain letters, digits, underscores (_), and hyphens (-).

    subnet_key1

    Value
    • Can contain a maximum of 43 characters.
    • Can contain letters, digits, underscores (_), periods (.), and hyphens (-).

    subnet-01
  3. Confirm the current configuration and click Create Now.
Parent topic: VPC