Help Center > > User Guide> VPC and Subnet> VPC> Creating a VPC

Creating a VPC

Updated at: Sep 02, 2021 GMT+08:00

Scenarios

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

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. Log in to the management console.
  2. On the console homepage, under Networking, click Virtual Private Cloud.
  3. Click Create VPC.
  4. 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.
    Table 1 VPC parameter descriptions

    Parameter

    Description

    Example Value

    Region

    Regions are geographic areas that are physically isolated from each other. The networks inside different regions are not connected to each other, so resources cannot be shared across different regions. For lower network latency and faster access to your resources, select the region nearest you.

    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-001

    CIDR Block or 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

    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.

    The tag key and value must meet the requirements listed in Table 3.

    • Key: vpc_key1
    • Value: vpc-01
    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

    IPv4 CIDR Block

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

    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.

    -

    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.

    Default

    Gateway

    The gateway address of the subnet.

    This IP address is used to communicate with other subnets.

    192.168.0.1

    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 this parameter is left empty, no IP address of the NTP server is 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

    DNS Server Address

    DNS server addresses allow ECSs in a VPC subnet to communicate with each other using private domain names. You can also directly access cloud services through private DNS servers.

    If you want to use other public DNS servers for resolution, you can change the default DNS server addresses.

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

    100.125.x.x

    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. Unit: Dayor hour

    If a DHCP lease time is changed, the new lease automatically takes effect when half of the current lease time has passed. To make the change take effect immediately, restart the ECS or log in to the ECS to cause the DHCP lease to automatically renew.

    365 days

    Tag

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

    The tag key and value must meet the requirements listed in Table 4.

    • Key: subnet_key1
    • Value: subnet-01

    Table 3 VPC tag key and value requirements

    Parameter

    Requirements

    Example Value

    Key

    • Cannot be left blank.
    • Must be unique for the same 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

  5. Confirm the current configuration and click Create Now.

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