Configuring a VPC for ECSs That Access the Internet Using EIPs
- Log in to the management console.
- Click
in the upper left corner and choose Network > Virtual Private Cloud.
The Virtual Private Cloud page is displayed.
- Click Create VPC.
The Create VPC page is displayed.
- 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
Select the region nearest to you to ensure the lowest latency possible.
-
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
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
Advanced Settings
Click the drop-down arrow to set advanced VPC parameters, including tags.
Retain the default settings.
Tag
The VPC tag, which consists of a key and value pair. You can add a maximum of 10 tags to each VPC.
- Key: vpc_key1
- Value: vpc-01
Table 2 Subnet parameter descriptions Parameter
Description
Example Value
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.
Note the following when you select an AZ:- A VPC can have subnets that are in different AZs. For example, a VPC can have subnet A in AZ 1, and subnet B in AZ 3.
- A cloud resource and its subnet can be in different AZs. For example, a cloud server in AZ 1 can use a subnet in AZ 3.
AZ1
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
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.
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
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: Day or hourAfter 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.
-
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.
- 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
- Confirm the current configuration and click Create Now.
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