cron job check spot instance 2 minutes termination to deregister from application load balancer target group

termination-wrap.sh

                    #!/bin/bash
                      echo "start spot termination check"
                      meta_url=http://169.254.169.254/latest/meta-data
                      if curl -s $meta_url/spot/termination-time | grep -q .*T.*Z; then
                         target_group=${tgARN};
                         role_arn='${role}'
                         keyId=`curl -s $meta_url/iam/security-credentials/$role_arn | python -c "import sys, json; obj = json.load(sys.stdin); print(obj['AccessKeyId'])"`
                         secretKey=`curl -s $meta_url/iam/security-credentials/$role_arn | python -c "import sys, json; obj = json.load(sys.stdin); print(obj['SecretAccessKey'])"`
                         token=`curl -s $meta_url/iam/security-credentials/$role_arn | python -c "import sys, json; obj = json.load(sys.stdin); print(obj['Token'])"`
                         export AWS_ACCESS_KEY_ID=$keyId
                         export AWS_SECRET_ACCESS_KEY=$secretKey
                         export AWS_SESSION_TOKEN=$token
                         export AWS_DEFAULT_REGION=${AWS::Region}
                         instance_id=`curl -s $meta_url/instance-id`;
                         for target in $target_group
                             do
                                :
                                instance_ports=`aws elbv2 describe-target-health --target-group-arn $target | python -c "import sys, json; obj = json.load(sys.stdin); results = [ node for node in obj['TargetHealthDescriptions'] if node['Target']['Id']=='$instance_id']; ports = [ str(node['Target']['Port']) for node in results if node['TargetHealth']['State']=='healthy']; print ' '.join(ports)"`
                                echo instance mapping port to elb is $instance_ports
                                for port in $instance_ports
                                    do
                                       :
                                       echo deregister instance $instance_id port $port from target group $target
                                       aws elbv2 deregister-targets --target-group-arn $target --targets Id=$instance_id,Port=$port
                                done
                         done
                       else
                         echo "complete spot termination check"	 
                       fi

target_group is an array variable