Server Load Balancer:Modify the configurations of ALB instances

Limits

• If an ALB instance is deployed in one or two zones, you cannot reduce the number of zones.

• EIPs allocated to different zones of the same ALB instance must be of the same type.

• Only pay-as-you-go (pay-by-data-transfer) EIPs that are not associated with Internet Shared Bandwidth instances can be associated with an ALB instance. Subscription EIPs and pay-as-you-go EIPs that use the pay-by-bandwidth metering method are not supported.

• After you associate an EIP with an ALB instance, you can then associate an Internet Shared Bandwidth instance with the ALB instance in the ALB console.

Effective time

Zone changes take effect immediately. If network latency is high, wait a few minutes.

Billing impact

When you change the zones of an Internet-facing ALB instance, the associated EIPs may change. Check your bills for actual EIP charges. For more information, see EIP billing.

Procedure

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 and choose > Modify Zone/Subnet in the Actions column.

4. In the Modify Zone/Subnet dialog box, select or clear zones and vSwitches, then click OK.

   Note

   If no vSwitch is available, click Create vSwitch in the drop-down list. For more information, see Create and manage a VPC.

   For Internet-facing ALB instances:

   • Assign an EIP to each selected zone.

   • If you select Purchase EIP, 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.

Zone status reference

Limits

• Only ALB upgraded instances support DNS record removal and restoration.

  Note

  Before the upgrade, ALB instances in static IP mode supported this feature, while ALB instances in dynamic IP mode did not.

• If only one zone of an ALB instance is in the Enabled state, you cannot remove its DNS record.

Effective time

DNS record removal and restoration take effect immediately. If network latency is high, wait a few minutes.

Billing impact

None.

Procedure

1. Log on to the ALB console.

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

3. On the Instances page, click the ID of the ALB instance.

4. On the Instance Details tab, go to the Zone section and perform one of the following operations:

   • Remove a DNS record

     In the Actions column of the target zone, click Remove DNS. In the message that appears, confirm the impacts and click Remove DNS.

     Note

     • This operation affects only the current ALB instance. Other instances in the zone are not affected.

     • Removing a DNS record deletes the A record that resolves the ALB domain name to the zone IP address. Proceed with caution.

     After removal, the zone status changes to DNS Removed and the system stops probing the IP address availability.

   • Restore a DNS record

     In the Actions column of a zone in the DNS Removed state, click Resume DNS. In the message that appears, confirm the impacts and click Resume DNS.

     Note

     After the DNS record is restored, an A record is added that resolves the ALB domain name to the zone IP address. Traffic destined for the ALB domain name is forwarded through this zone.

     After restoration, the zone status changes to Enabled and the IP address availability is probed.

Limits

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

• You can downgrade a WAF-enabled ALB instance to a standard ALB instance, but not to a basic ALB instance.

• For limits on WAF-enabled ALB instances, see Activate and manage WAF-enabled ALB instances.

Effective time

The new edition takes effect immediately in most cases. If network latency is high, wait a few minutes.

Billing impact

• Different editions have different fee structures. Check your bills for actual charges. For more information, see Billing rules.

• Upgrading to the WAF-enabled edition incurs 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 exists in your Alibaba Cloud account when you purchase a WAF-enabled ALB instance, a pay-as-you-go WAF 3.0 instance is automatically created.

Procedure

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 and choose > Change Specification in the Actions column.

4. On the Application Load Balancer | Upgrade/Downgrade page, set Edition to Standard or WAF Enabled, review the Terms of Service, and click Buy Now.

Verify the result

Return to the Instances page and confirm that the edition of the ALB instance is updated.

Limits

• The line types of the EIPs must match the line type of the Internet Shared Bandwidth instance.

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

Effective time

The association takes effect immediately. If network latency is high, wait a few minutes.

Billing impact

You are charged for the Internet Shared Bandwidth instance. For more information, see Billing overview.

Procedure

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 and associate an Internet Shared Bandwidth instance by using one of the following methods:

   • Choose > Associate with Internet Shared Bandwidth in the Actions column, or click Associate in the Internet Shared Bandwidth column.

   • Click the ID of the ALB instance. On the Instance Details tab, find the Billing Information section and click Associate with Internet Shared Bandwidth.

4. In the Associate with EIP Bandwidth Plan dialog box, select an Internet Shared Bandwidth instance and click OK.

   Note

   If no Internet Shared Bandwidth instance is available, click Purchase Internet Shared Bandwidth in the drop-down list. For details, see Create an Internet Shared Bandwidth instance.