After you create an Elastic IP Address (EIP) and associate it with an Elastic Compute Service (ECS) instance, the ECS instance can communicate with the Internet.
You cannot associate an EIP with an ECS instance that is already assigned a public IP address. However, you can convert the assigned static public IP address to an EIP.
Step 1: Request an EIP
An EIP is a standalone public IP address that you can purchase. To use an EIP, you must first request an EIP.
Log on to the Elastic IP Addresses console.
On the Elastic IP Addresses page, click Create EIP.
On the creation page, configure the EIP. Then, click Buy Now and complete the payment.
Configuration
Description
Billing Method
Select a billing method for the EIP. In this topic, Pay-as-you-go is selected.
Region
Select the region for the EIP. Make sure that the EIP and the ECS instance to be associated are in the same region.
Line Type
Select a line type for the EIP. In this topic, BGP (Multi-ISP) is selected.
Network Type
Select a network type for the EIP. Currently, only the Internet network type is supported.
Security Protection
Select an edition of Anti-DDoS service as needed. In this topic, Default is selected.
IP Address Pool
Select an IP address pool. If you do not select a specific address pool, an EIP is allocated to you from the public IP address pool of Alibaba Cloud by default.
Data Transfer
Select a metering method for the EIP data transfer. In this topic, Pay-By-Bandwidth is selected.
Maximum Bandwidth
Select a peak bandwidth for the EIP. In this topic, this parameter is set to 1 Mbps.
Name
Enter a name for the EIP.
Resource Group
Select the resource group to which the EIP belongs.
Billing Cycle
Select a billing cycle for the EIP. Currently, pay-by-bandwidth EIPs support only billing by Day.
Quantity
Select the number of EIPs to purchase.
Step 2: Associate an EIP with an ECS instance
Associate the EIP with an ECS instance in a virtual private cloud (VPC). Once the ECS instance is associated with the EIP, the ECS instance can communicate with the Internet.
Log on to the Elastic IP Addresses console.
In the top navigation bar, select the region of the EIP.
On the Elastic IP Addresses page, find the target EIP. In the Actions column, click Associate with Resource.
In the Associate EIP with Resource dialog box, configure the following parameters and click OK.
Configuration
Description
Instance Type
Select ECS Instance.
Resource Group
Select the resource group to which the ECS instance belongs.
Select an instance to associate
Select the ECS instance with which you want to associate the EIP. Make sure that the ECS instance is in the Running or Stopped state, and is not assigned a static public IP address or associated with another EIP.
Step 3: Test the connection
After you associate the EIP with the ECS instance, test whether the ECS instance can connect to the Internet.
Log on to the ECS instance that is associated with the EIP.
Run the
ping <public_domain_name>command to verify the Internet connection.
References
AllocateEipAddress: Request an EIP.
AssociateEipAddress: Associate an EIP with a cloud resource in the same region.
ReleaseEipAddress: Release a specified EIP.