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Remediation

The Load Balancer should be configured to use subnets in at least two different Availability Zones.

Configure Subnets​

From Command Line​

For Application, Network and Gateway Load Balancers​

aws elbv2 set-subnets \
    --load-balancer-arn {{load-balancer-arn}} \
    --subnets {{subnet-id1}} {{subnet-id2}}

For a Classic Load Balancer​

aws elb attach-load-balancer-to-subnets \
    --load-balancer-name {{load-balancer-name}} \
    --subnets {{subnet-id1}} {{subnet-id2}}