Zonal shift - Elastic Load Balancing
Start a zonal shiftUpdate a zonal shiftCancel a zonal shift
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Zonal shift

Zonal shift is a capability in Amazon Route 53 Application Recovery Controller (Route 53 ARC). With zonal shift, you can shift a load balancer resource away from an impaired Availability Zone with a single action. This way, you can continue operating from other healthy Availability Zones in an Amazon Web Services Region.

When you start a zonal shift, your load balancer stops sending traffic for the resource to the affected Availability Zone. Route 53 ARC creates the zonal shift immediately. However, it can take a short time, typically up to a few minutes, to complete existing, in-progress connections in the affected Availability Zone. For more information, see How a zonal shift works: health checks and zonal IP addresses in the Amazon Route 53 Application Recovery Controller Developer Guide.

Zonal shifts are only supported on Application Load Balancers and Network Load Balancers with cross-zone load balancing turned off. If you turn on cross-zone load balancing, you can't start a zonal shift. For more information, see Resources supported for zonal shifts in the Amazon Route 53 Application Recovery Controller Developer Guide.

Before you use a zonal shift, review the following:

  • Cross-zone load balancing isn't supported with zonal shifts. You must turn off cross-zone load balancing to use this capability.

  • Zonal shift isn't supported when you use an Application Load Balancer as an accelerator endpoint in Amazon Global Accelerator.

  • You can start a zonal shift for a specific load balancer only for a single Availability Zone. You can't start a zonal shift for multiple Availability Zones.

  • Amazon proactively removes zonal load balancer IP addresses from DNS when multiple infrastructure issues impact services. Always check current Availability Zone capacity before you start a zonal shift. If your load balancers have cross-zone load balancing turned off and you use a zonal shift to remove a zonal load balancer IP address, the Availability Zone affected by the zonal shift also loses target capacity.

  • When an Application Load Balancer is a target of a Network Load Balancer, always start the zonal shift from the Network Load Balancer. If you start a zonal shift from the Application Load Balancer, the Network Load Balancer doesn't recognize the shift and continues to send traffic to the Application Load Balancer.

For more guidance and information, see Best practices with Route 53 ARC zonal shifts in the Amazon Route 53 Application Recovery Controller Developer Guide.

Start a zonal shift

The steps in this procedure explain how to start a zonal shift using the Amazon EC2 console. For steps to start a zonal shift using the Route 53 ARC console, see Starting a zonal shift in the Amazon Route 53 Application Recovery Controller Developer Guide.

To start a zonal shift using the console

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. On the navigation pane, under Load Balancing, choose Load Balancers.

  3. Select the load balancer name.

  4. On the Integrations tab, under Route 53 Application Recovery Controller, choose Start zonal shift.

  5. Select the Availability Zone that you want to move traffic away from.

  6. Choose or enter an expiration for the zonal shift. A zonal shift can initially be set from 1 minute up to three days (72 hours).

    All zonal shifts are temporary. You must set an expiration, but you can update active shifts later to set a new expiration.

  7. Enter a comment. You can update the zonal shift later to edit the comment, if you like.

  8. Select the check box to acknowledge that starting a zonal shift will reduce capacity for your application by shifting traffic away from the Availability Zone.

  9. Choose Start.

To start a zonal shift using the Amazon CLI

To work with zonal shift programmatically, see the Zonal Shift API Reference Guide.

Update a zonal shift

The steps in this procedure explain how to update a zonal shift using the Amazon EC2 console. For steps to update a zonal shift using the Amazon Route 53 Application Recovery Controller console, see Updating a zonal shift in the Amazon Route 53 Application Recovery Controller Developer Guide.

To update a zonal shift using the console

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. On the navigation pane, under Load Balancing, choose Load Balancers.

  3. Select a load balancer name that has an active zonal shift.

  4. On the Integrations tab, under Route 53 Application Recovery Controller, choose Update zonal shift.

    This opens the Route 53 ARC console to continue the update.

  5. For Set zonal shift expiration, optionally select or enter an expiration.

  6. For Comment, optionally edit the existing comment or enter a new comment.

  7. Choose Update.

To update a zonal shift using the Amazon CLI

To work with zonal shift programmatically, see the Zonal Shift API Reference Guide.

Cancel a zonal shift

The steps in this procedure explain how to cancel a zonal shift using the Amazon EC2 console. For steps to cancel a zonal shift using the Amazon Route 53 Application Recovery Controller console, see Canceling a zonal shift in the Amazon Route 53 Application Recovery Controller Developer Guide.

To cancel a zonal shift using the console

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. On the navigation pane, under Load Balancing, choose Load Balancers.

  3. Select a load balancer name that has an active zonal shift.

  4. On the Integrations tab, under Route 53 Application Recovery Controller, choose Cancel zonal shift.

    This opens the Route 53 ARC console to continue the cancelation.

  5. Choose Cancel zonal shift.

  6. On the confirmation dialog, choose Confirm.

To cancel a zonal shift using the Amazon CLI

To work with zonal shift programmatically, see the Zonal Shift API Reference Guide.