If the configurations of an Elastic Compute Service (ECS) instance do not meet your business needs, you can change the configurations, including the instance type (vCPUs and memory), bandwidth configurations, and the billing methods of the data disks. This topic describes methods of changing the configurations of an ECS instance.

Change instance types

An instance type is a predefined combination of vCPUs and memory. When you change the instance type of an instance, you must change both the number of vCPUs and memory size. The number of vCPUs or memory size cannot be changed individually.

Before you can change the instance type of an instance, you must identify the compatible instance types and learn about the instance types. The compatible instance types are displayed on the configuration change page.

The following table describes the change methods best suited for different billing methods of your instances.

Billing method Change time Effective time References
Subscription Before the instance expires After the instance is restarted
Within 15 days before the instance expires After the instance is restarted within the first seven days of the new billing cycle Downgrade the configurations of an instance during renewal
Pay-as-you-go N/A After the instance is restarted Change the instance type of a pay-as-you-go instance

Change the billing method for network usage

You can use different methods to change the billing method for network usage of an instance based on the public IP address type. The following table describes the methods.

Public IP address type Effective time References
System-assigned public IP address Immediately Change the billing method for network usage
Elastic IP address (EIP) Immediately Modify the bandwidth of an EIP

Modify public bandwidth

You can use different methods to modify the public bandwidth of an instance based on your business needs and the billing method of the instance. The following table describes the methods.

If you have reduced the public bandwidth of an instance to 0 Mbit/s, the public IP address of the instance is retained or released based on the network type.
  • If the instance is located in a virtual private cloud (VPC), the public IP address of the instance is released immediately.
  • If the instance is located in the classic network, the instance can no longer access the Internet but its public IP address is retained.

You can set the public bandwidth to a non-zero value when you create an instance. The system assigns a public IP address to the created instance. If you set the public bandwidth to zero when you create an instance, the instance is not assigned a public IP address. After the instance is created, you can change the public bandwidth from 0 Mbit/s to a non-zero value by using the configuration upgrade feature to assign a public IP address to the instance.

Public IP address type Applicable scope Effective time References
System-assigned public IP address Modify the base public bandwidth for a subscription instance Immediately Modify the bandwidth configurations of subscription instances
Modify the base public bandwidth for a subscription instance during renewal After the new billing cycle starts Downgrade the configurations of an instance during renewal
Modify the base public bandwidth for a pay-as-you-go instance Immediately Modify the bandwidth configurations of pay-as-you-go instances
EIP Modify the bandwidth of an EIP for a subscription or pay-as-you-go instance Immediately Modify the bandwidth of an EIP
Note The first time you upgrade the public bandwidth of an instance located in the classic network from 0 Mbit/s, you must restart the instance for the new configurations to take effect. You can restart the instance by using the ECS console or by calling the RebootInstance operation.

Change the billing methods of data disks

Only pay-as-you-go data disks can be attached to pay-as-you-go instances. Therefore, you can change the billing methods of data disks only for subscription instances.

Change time Effective time References
Before the instance expires Immediately Change the billing method of a disk
Within the 15 days before the instance expires or when the instance has expired but not been released Immediately Downgrade the configurations of an instance during renewal

FAQ

The following section provides answers to the frequently asked questions about upgrading and downgrading the configurations of instances. For more information, see Instance FAQ.

  • How is the fee for an instance configuration upgrade calculated?

    The fee and its calculation method are displayed in the ECS console when you upgrade the instance type or other configurations of an instance. You can also view the billing details on the Account Overview page.

  • Are my cloud service configurations affected if I upgrade the configurations of ECS instances?

    Pay-as-you-go instances must be stopped before their configurations can be upgraded. After you upgrade the configurations of a subscription instance, you must restart the instance for the new configurations to take effect. The upgrade operation interrupts services that are running on the instance for a short period of time. We recommend that you upgrade instances during off-peak hours. After an instance upgrade, the instance seamlessly resumes services without the need to reconfigure its environment.

  • After I make an upgrade order for an instance, can I cancel the order and restore the instance to its original configurations?

    No, you cannot cancel the order and restore the instance to its original configurations. After an upgrade order for an instance takes effect, the order cannot be canceled and the configurations of the instance are upgraded. If you want to restore the instance to its original configurations, you can downgrade its configurations. You are charged for the downgrade operation.