You can use elastic network interfaces (ENIs) to deploy high availability clusters and perform low-cost failover and fine-grained network management. This topic describes how to separately create an ENI in the ECS console.

Prerequisites

Background information

You can use one of the following methods to create an ENI. This topic describes how to separately create an ENI.
  • Create an ENI when you create an instance.

    When you create an instance, you can bind only one primary and one secondary ENIs to the instance. If you do not unbind the secondary ENI from the instance, the secondary ENI will be released together with the instance. For more information, see Bind an ENI when you create an instance.

  • Create an ENI separately.

    ENIs that are separately created are secondary ENIs and can be bound to instances.

Procedure

  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Network & Security > ENIs.
  3. In the top navigation bar, select a region.
  4. Click Create ENI.
  5. In the Create ENI dialog box, complete the following configurations.
    Parameter Description
    ENI Name Enter a name in the ENI Name field.
    VPC Select the VPC to which the instance to be bound belongs. After the ENI is created, you cannot change its VPC.
    Note An ENI can be bound to only an instance that is in the same VPC as the ENI.
    VSwitch Select a VSwitch that is in the same zone as the instance. After the ENI is created, you cannot change its VSwitch.
    Note An ENI can be bound to only an instance that is in the same zone as the ENI. The instance and the ENI can belong to different VSwitches.
    Primary Private IP Optional. Enter the primary private IPv4 address of the ENI. The IPv4 address must be within the range of the idle CIDR block of the VSwitch. If you do not specify an IPv4 address, a private IPv4 address is automatically assigned to your ENI after the ENI is created.
    Secondary Private IP Addresses Optional. Set the secondary private IP addresses of the ENI.
    • Not set: No secondary private IP addresses are assigned to the ENI.
    • Auto: You can enter an integer from 1 to 9 as the number of secondary private IP addresses of the ENI. The system then automatically assigns the corresponding number of idle IP addresses in the VSwitch to the ENI.
    • Manual: You can manually add secondary private IP addresses. You can specify up to nine secondary private IP addresses.
    Security Group Select security groups in the current VPC. You can specify one to five security groups.
    Note You cannot select a basic security group and an advanced security group at the same time.
    Description Optional. Enter the description of the ENI for later management.
    Resource Group Optional. Select a resource group to which the ENI will be added. For more information about resource groups, see Resource groups.
    Tag Optional. Select one or more tags to be bound to the ENI. For more information about tags, see Overview.
  6. Click OK.

Result

If the status of the ENI is Available in the ENI list, the creation succeeds.

What to do next

After you separately create an ENI, you can bind it to an instance. For more information, see Bind an ENI.