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Remediation

Change Availability Zones​

From Command Line​

To configure your Auto Scaling Group to span multiple Availability Zones, update it with subnets that belong to different AZs using the update-auto-scaling-group command:

aws autoscaling update-auto-scaling-group \
    --auto-scaling-group-name {{asg-name}} \
    --vpc-zone-identifier "subnet-xxxxxxxx,subnet-yyyyyyyy,subnet-zzzzzzzz"

After updating the Auto Scaling Group, ensure the associated load balancer is also configured to use subnets from multiple Availability Zones:

aws elbv2 set-subnets \
    --load-balancer-arn {{lb-arn}} \
    --subnets "subnet-xxxxxxxx" "subnet-yyyyyyyy" "subnet-zzzzzzzz"