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    Server Load Balancer:Modify the configurations of ALB instances

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    Server Load Balancer:Modify the configurations of ALB instances

    Last Updated:Sep 21, 2023

    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:

    • The elastic IP addresses (EIPs) allocated to different zones of the same ALB instance must be of the same type. For more information, see What types of EIPs can be associated with ALB instances?

    • You can associate only pay-as-you-go (pay-by-data-transfer) EIPs that are not associated with Internet Shared Bandwidth instances with an ALB instance. After you associate an EIP with an ALB instance, you can associate an Internet Shared Bandwidth instance with the ALB instance in the ALB console.

    • You cannot associate a subscription EIP or a pay-as-you-go EIP that uses the pay-by-bandwidth metering method with an 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.

    1. Log on to the ALB console.

    2. In the top navigation bar, select the region where the ALB instance is deployed.

    3. On the Instances page, find the ALB instance that you want to manage and choose 更多操作 > Modify Zone/Subnet in the Actions column.

    4. 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

    • You cannot change a standard ALB instance to a basic ALB instance.

    • You can change a WAF-enabled ALB instance to a standard ALB instance. You cannot change a WAF-enabled ALB instance to a basic ALB instance.

    • For more information about the limits and management of WAF-enabled ALB instances, see Activate and manage WAF-enabled ALB instances.

    In most cases, the new edition immediately takes effect. If the network latency is high, you may need to wait a few minutes.

    • After you change the edition of an ALB instance, you are charged different fees. Check your bills for the actual fees. For more information, see ALB billing rules.

    • After you upgrade an ALB instance to a WAF-enabled ALB instance, you are charged a security protection fee for Web Application Firewall (WAF) 3.0. For more information, see Subscription WAF 3.0 instances and Pay-as-you-go WAF 3.0 instances. If no WAF instance is created in your Alibaba Cloud account and you purchase a WAF-enabled ALB instance, a pay-as-you-go WAF 3.0 instance is created.

    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.

    1. Log on to the ALB console.

    2. In the top navigation bar, select the region where the ALB instance is deployed.

    3. On the Instances page, find the instance that you want to manage and choose 更多操作 > Change Specification in the Actions column.

    4. 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.

    Note

    • 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

    • The line types of the EIPs must be the same as the line type of the Internet Shared Bandwidth instance.

    • Subscription and pay-as-you-go Internet Shared Bandwidth instances are supported.

    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.

    1. Log on to the ALB console.

    2. In the top navigation bar, select the region where the ALB instance is deployed.

    3. 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 更多操作 > Associate EIP Bandwidth Plan 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.

    4. 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