Elastic Public IP

Scenarios

Elastic public IP address, also known as an Elastic IP (EIP), is a regional static IP address designed for dynamic cloud computing. With EIP, you can quickly map an address to another instance (or NAT gateway instance) in your account for failure isolation. This document describes how to use an EIP.

Prerequisites

Log in to the CVM console.

Operation Steps

Applying for an EIP

1. In the left sidebar, click EIP.
2. On the EIP management page, click Apply.
3. In the pop-up Apply for EIP window, select the region, set the billing mode and bandwidth limit, enter the quantity, and click Confirm to complete the application for the EIP.
   After the application is completed, you can see the EIP you applied for in the list, which is currently in an unbound status.

Binding an EIP to a Cloud Service

1. In the left sidebar, click EIP.

2. On the EIP management page, select the EIP to which you want to bind a cloud service and click More > Bind.

   Note:

   If the EIP is already associated with another instance, unbind it first.

3. In the pop-up Bind Resource window, select the cloud resource to which the EIP is to be bound and click OK.

4. In the pop-up Bind EIP dialog box, click OK to complete the binding with the Cloud Services.

Unbinding an EIP from a Cloud Service

1. In the left sidebar, click EIP.
2. On the EIP management page, select the EIP from which you want to unbind a cloud service and click Unbind.
3. In the pop-up Unbind EIP window, confirm the unbinding information and click Confirm.
   Note:

   After unbinding, the cloud product instance may be assigned a new public IP address, which may differ from the one assigned before binding.

Releasing an EIP

1. In the left sidebar, click EIP.
2. On the EIP management page, select the EIP for which the cloud service needs to be released and click More > Release.
3. In the pop-up window, click Confirm.
4. In the confirmation window, click Confirm.

Adjusting the Bandwidth

1. In the left sidebar, click EIP.
2. On the EIP management page, select the EIP whose bandwidth needs to be adjusted and click Adjust bandwidth.
3. In the pop-up Adjust Bandwidth window, set the target bandwidth value and click Confirm to complete the bandwidth adjustment.

Exceptions Troubleshooting

EIPs may experience network disconnection, which is generally caused by the following reasons:

• EIPs are not bound to cloud services. For specific binding methods, see Binding an EIP to a Cloud Service.
• The security policy is not taking effect. Check whether any effective security policies (such as security groups or network ACLs) are in place. If the bound cloud product instance has a security policy that, for example, blocks access to port 8080, then the EIP's port 8080 will also be inaccessible.