Elastic IP

Last updated: 2020-06-11 17:04:08

    Scenario

    Elastic IP, or ElP, is a static IP designed for dynamic cloud computing and a fixed public IP in a certain region. With EIP, you can quickly remap an address to another instance in your account or NAT gateway instance to avoid instance failure. This document describes how to use EIPs.

    Prerequisites

    You have logged in to the CVM Console.

    Directions

    Apply for EIPs

    1. In the left sidebar, click EIP to enter the EIP management page.
    2. Click Apply in the EIP management page.
    3. In the pop-up “Apply for EIP” window, select the region, IP address type, billing method and bandwidth limit, and enter the number of EIPs you want to apply for.
    4. Click OK to complete the EIP application.
      After the application is completed, you can see in the list the EIP you have applied for, which is in an unbound status.

    Bind EIPs to cloud products

    1. In the left sidebar, click EIP to enter the EIP management page.
    2. In the EIP management page, select the EIP which you want to bind to a cloud product and click More > Bind.

      If the EIP has been bound to a instance, please unbind it first.

    3. In the pop-up “Bind resources” window, select the resource to be bound to the EIP and click OK.
    4. In the pop-up window, click OK to complete binding the EIP to the cloud product.

    Unbind EIPs from cloud products

    1. In the left sidebar, click EIP to enter the EIP management page.
    2. In the EIP management page, select the EIP which you want to unbind from the cloud product and click More > Unbind.
    3. In the pop-up “Unbind EIP” window, confirm the unbinding information and click OK.
    4. In the pop-up window, click OK to complete unbinding the EIP from the cloud product.

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

    Release EIPs

    1. In the left sidebar, click EIP to enter the EIP management page.
    2. In the EIP management page, select the EIP which you want to release from the cloud product and click More > Release.
    3. In the pop-up “Are you sure you want to release the selected EIPs?” window, select Release the above EIPs and click Release.

    Adjust Bandwidth

    1. In the left sidebar, click EIP to enter the EIP management page.
    2. Select the EIP whose bandwidth needs to be adjusted and click Adjust Bandwidth
    3. In the pop-up “Adjust Bandwidth” window, configure the bandwidth value and click OK to complete the adjustment.

    Convert a public IP to an EIP

    The public IP purchased along with the CVM instance is not elastic and cannot be mounted or unmounted. Tencent Cloud allows you to convert the public IP to an EIP by the following steps:

    1. In the left sidebar, click Instances to enter the instance management page.
    2. Select the instance whose public IP needs to be converted to an EIP and then click , as shown below:
    3. In the pop-up “Convert to EIP” window, click OK.

    Troubleshoot Exceptions

    Network inaccessibility may occur with an EIP due to the following reasons:

    • The EIP is not bound to any cloud product. For more information about how to bind an EIP to the cloud product, please see Bind EIPs to cloud products.
    • Security policy is invalid. Check if there is a valid security policy (security group or network ACL). If the bound cloud product has a security group policy, such as access to 8080 port is denied, the port 8080 of the EIP is also inaccessible.

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