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AWS ECS 503 Temporarily Unavailable During Deployment

I am using Amazon Web Services EC2 container service with application load balancer for my application. When I deploy the new version, I get 503 Service Temporarily Unavailable for about 2 minutes. This is slightly longer than the launch time of my application. This means that I cannot perform a deployment with zero downtime.

Is there a parameter to not use new tasks during their launch? Or what am I missing here?

UPDATE:

The health check numbers for the target ALB are as follows:

Healthy threshold:     5
Unhealthy threshold:   2
Timeout:               5 seconds
Interval:              30 seconds
Success codes:         200 OK

Healthy threshold: “Number of successful health checks needed before considering a healthy healthy goal.”
Unhealthy threshold: “Number of successive health checks needed before considering a goal that is unhealthy.”
Timeout: "The amount of time, in seconds, during which no response indicates a failed health check."
Interval is the "approximate amount of time between health checks for a particular target

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script

# Remove Health Check target
echo -e "\nDisabling the ELB Health Check target and waiting for OutOfService\n"
rm -f /home/$USER/$MYAPP/server/public/alive.html

# Loop until the Instance is Out Of Service
while true
do
        RESULT=$(aws elb describe-instance-health --load-balancer-name $ELB --region $REGION --instances $AMAZONID)
        if echo $RESULT | grep -qi OutOfService ; then
                echo "Instance is Deattached"
                break
        fi
        echo -n ". "
        sleep $INTERVAL
done
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( conf):

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awslogs-group: mycompany ( Cloudwatch, )
awslogs-region: us-east-1 ( )
awslogs-stream-prefix: myservice ( )

This will give you more information about what happens during initialization of the container if it is too long or if it does not work.

Hope this helps !!!

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