This topic describes the rules and procedures for modifying the configurations of Application Load Balancer (ALB) instances.
Change the zones where an ALB instance is deployed
The following table describes the limits, effective time, and impacts on billing when you change the zones of an ALB instance.
Limit | Effective time | Impact on billing | Scenario |
If an ALB instance is deployed in one or two zones, you cannot reduce the number of zones for the instance. Limits on changing the zones of an Internet-facing ALB instance:
| After you change the zones of an ALB instance, the new zones immediately take effect. If the network latency is high, you may need to wait a few minutes. | If you change the zones of an Internet-facing ALB instance, the EIPs that are associated with the ALB instance may change. You are charged for the EIPs. Check your bills for the actual fees. For more information, see EIP billing. | If the zones of an ALB instance or the EIPs associated with your Internet-facing ALB instance do not meet your business requirements or exceed your business requirements, you can change the zones of the ALB instance. |
- Log on to the ALB console.
In the top navigation bar, select the region where the ALB instance is deployed.
On the Instances page, find the ALB instance that you want to manage and choose in the Actions column.
In the Modify Zone/Subnet dialog box, select or clear zones and vSwitches and click OK.
If no vSwitch is available, click Create vSwitch in the drop-down list. For more information, see Create and manage a VPC.
If you select zones for an Internet-facing ALB instance, you must also assign an EIP to each zone.
If you select Purchase EIP when you assign an EIP to an Internet-facing ALB instance, a pay-as-you-go EIP that uses the pay-by-data-transfer metering method is created. The EIP uses BGP (Multi-ISP) lines and is protected by Anti-DDoS Origin Basic.
Change the edition of an ALB instance
ALB provides basic, standard, and WAF-enabled instances. You can change the edition of an ALB instance. When you change the edition of an ALB instance, the ALB instance continues to provide services.
For more information about the features supported by different editions, see Functions and features.
For more information about the quotas of ALB resources, see ALB quotas.
The following table describes the limits, effective time, and impacts on billing when you change the edition of an ALB instance.
Limit | Effective time | Impact on billing | Scenario |
| In most cases, the new edition immediately takes effect. If the network latency is high, you may need to wait a few minutes. |
| If the edition of an ALB instance does not meet your business requirements or exceeds your business requirements, you can change the edition of the instance. |
- Log on to the ALB console.
In the top navigation bar, select the region where the ALB instance is deployed.
On the Instances page, find the instance that you want to manage and choose in the Actions column.
On the Application Load Balancer | Upgrade/Downgrade page, set Edition to Standard or WAF Enabled, select the Terms of Service, and then click Buy Now.
Return to the Instances page and check whether the edition of the ALB instance is updated.
Modify the maximum bandwidth
After you associate an Internet Shared Bandwidth instance with an Internet-facing ALB instance, you can modify the maximum bandwidth of the ALB instance by modifying the maximum bandwidth of the Internet Shared Bandwidth instance.
If an ALB instance in static IP mode is deployed in two zones and is not associated with an Internet Shared Bandwidth instance, the default maximum Internet bandwidth of the ALB instance is 400 Mbit/s. If an ALB instance in dynamic IP mode is deployed in two zones and is not associated with an Internet Shared Bandwidth instance, the default maximum Internet bandwidth of the ALB instance is 400 Mbit/s, which can be increased to up to 4,000 Mbit/s. For more information, see Performance metrics. The maximum bandwidth value is not a guaranteed value. It indicates the upper limit of bandwidth and is for reference only. The maximum bandwidth does not support dynamic scaling and cannot be modified.
If your ALB instance is associated with an Internet Shared Bandwidth instance, the maximum bandwidth of the ALB instance is determined by the maximum bandwidth of the Internet Shared Bandwidth instance.
You can create an Internet Shared Bandwidth instance or modify the maximum bandwidth of an existing Internet Shared Bandwidth instance to meet your business requirements. To create an Internet Shared Bandwidth instance or modify the maximum bandwidth of an existing Internet Shared Bandwidth instance, log on to the Internet Shared Bandwidth console.
The following table describes the limits, effective time, and impacts on billing when you associate the EIPs of an Internet-facing ALB instance with an Internet Shared Bandwidth instance.
Limit | Effective time | Impact on billing | Scenario |
| After you associate an Internet Shared Bandwidth instance with an ALB instance, the Internet Shared Bandwidth instance immediately takes effect. If the network latency is high, you may need to wait a few minutes. | You are charged for the Internet Shared Bandwidth instance. For more information, see Billing overview. | If the maximum bandwidth of an ALB instance does not meet your business requirements, you can associate an Internet Shared Bandwidth instance with the ALB instance in the ALB console. |
- Log on to the ALB console.
In the top navigation bar, select the region where the ALB instance is deployed.
On the Instances page, find the ALB instance that you want to manage and associate an Internet Shared Bandwidth instance with the ALB instance by using one of the following methods:
Choose
in the Actions column or click Associate in the EIP Bandwidth Plan column.Click the ID of the ALB instance. On the Instance Details tab, find the Billing Information section and click Associate with EIP Bandwidth Plan.
In the Associate EIP Bandwidth Plan dialog box, select an Internet Shared Bandwidth instance and click OK.
If no Internet Shared Bandwidth instance is available, click Purchase EIP Bandwidth Plan in the drop-down list. We recommend that you purchase a pay-as-you-go Internet Shared Bandwidth instance. For more information about how to purchase an Internet Shared Bandwidth instance, see Create an Internet Shared Bandwidth instance.
References
UpdateLoadBalancerZones: changes the zones of an ALB instance.
UpdateLoadBalancerEdition: changes the edition of an ALB instance.
AttachCommonBandwidthPackageToLoadBalancer: associates an Internet Shared Bandwidth instance with an ALB instance.