Creating a CloudDCN Subnet
Scenarios
A subnet is a unique CIDR block with a range of IP addresses in a VPC. All resources in a VPC must be deployed on subnets.
When creating a VPC, you cannot create a CloudDCN subnet. You can create a CloudDCN subnet on the CloudDCN Subnets page for deploying physical servers.
Procedure
- Log in to the management console.
- Click
in the upper left corner and select the desired region and project.
- Click
in the upper left corner and choose Networking > Virtual Private Cloud.
The Virtual Private Cloud page is displayed.
- In the navigation pane on the left, choose Virtual Private Cloud > CloudDCN Subnets.
- Click Create CloudDCN Subnet.
The Create CloudDCN Subnet page is displayed.
- Set the parameters based on the below table.
Table 1 Parameters for creating a CloudDCN subnet Parameter
Description
Example Value
VPC
The VPC where you want to create a CloudDCN subnet. If no VPC is available, create one.
vpc-test
Subnet Name
The CloudDCN subnet name. The name:- Can contain 1 to 64 characters.
- Can contain letters, digits, underscores (_), hyphens (-), and periods (.).
subnet-clouddcn-01
AZ
An AZ is a geographic location with independent power supply and network facilities in a region. AZs are physically isolated, and AZs in the same VPC are interconnected through an internal network.
Each region contains multiple AZs. If one AZ is unavailable, other AZs in the same region continue to provide services.- By default, all instances in different subnets of the same VPC can communicate with each other and the subnets can be in different AZs. For example, if you have a VPC with two subnets, subnet A01 in AZ1 and CloudDCN subnet A02 in AZ2. A01 and A02 can communicate with each other by default.
- A cloud resource can be in a different AZ from its subnet. For example, a physical server in AZ1 can be in a CloudDCN subnet in AZ3. If AZ3 becomes faulty, physical servers in AZ1 can still use the CloudDCN subnet in AZ3, and your services are not interrupted.
For details, see Region and AZ.
AZ1
IPv4 CIDR Block
The IPv4 CIDR block range of a CloudDCN subnet. A CloudDCN subnet is a unique CIDR block with a range of IP addresses in a VPC.
A subnet mask can be between the netmask of its VPC CIDR block and /28 netmask. If a VPC CIDR block is 10.0.0.0/16, its subnet mask can between 16 to 28.
If the VPC has a secondary CIDR block, you can select the primary or the secondary CIDR block that the subnet will belong to based on service requirements.
10.0.0.0/24
Associated Route Table
The default route table with which the CloudDCN subnet will be associated. A route table contains a set of routes that are used to control the traffic routing for your subnets in a VPC. Each VPC comes with a default route table that will be automatically associated with CloudDCN subnets. This allows CloudDCN subnets in a VPC to communicate with each other.
-
Advanced Settings (Optional) > Gateway
The gateway address of the CloudDCN subnet. Click
to expand the configuration area and set this parameter.
Retain the default value unless there are special requirements.
10.0.0.1
Advanced Settings (Optional) > DNS Server Address
The DNS server addresses of the CloudDCN subnet. Click
to expand the configuration area and set this parameter.
A DNS server address is set by default to allow servers in a CloudDCN subnet to communicate with each other using private domain names. You can also directly access cloud services through private DNS servers.
You can change the default DNS server address if needed. This may interrupt your access to cloud services.
You can also click Reset on the right to restore the DNS server address 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
Advanced Settings (Optional) > Tag
The CloudDCN subnet tags. Click
to expand the configuration area and set this parameter.
Add tags to help you quickly identify, classify, and search for your CloudDCN subnets.
For details, see Managing CloudDCN Subnet Tags.
- Key: test
- Value: 01
Advanced Settings (Optional) > Description
Supplementary information about the CloudDCN subnet. Click
to expand the configuration area and set this parameter.
Enter a description about the CloudDCN subnet in the text box as required.
The description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).
-
- Click Create Now.
Return to the CloudDCN subnet list and view the subnet you have created.
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