ELBでOutOfServiceになったインスタンスをAutoScalingグループから強制排除

aws_autoscaling_terminate_elb_outofservice.bash

#!/bin/bash

if [ $# -lt 1 ]; then
    echo "Usage: `basename $0` {elb-name} [region]"
    exit 1
fi

ELB_NAME="$1"
REGION="${2:-ap-northeast-1}"

# :TODO
#   initial instances excluded.

aws elb describe-instance-health --load-balancer-name ${ELB_NAME} | \
jq '.InstanceStates[] | select(.State == "OutOfService").InstanceId' | \
sed -e 's/\"//g' | while read line; do
    aws autoscaling terminate-instance-in-auto-scaling-group --instance-id ${line} --no-should-decrement-desired-capacity
done