We trigger autoscaling on a TargetResponseTime threshold. Launch and turning healthy for new EC2 instance takes close to 20 mins. When we check the codedeploy we see two kinds of time, one in Deployment history start time Aug 22, 2019 3:10 PM and end time Aug 22, 2019 3:28 PM. Going to that particular deployment, we see duration as 2 minutes 21 seconds, from ApplicationStop to AfterAllowTraffic. Where is the rest of the time spent? Why is that Deployment history shows 18 mins whereas the deployment time is 2 mins 21 sec?
How can we reduce this time?
Background: To launch EC2 instance by autoscaling we have a launch configuration that installs the codedeploy agent. The instance would be in Pending:Wait state in Auto Scaling Group Instances' lifecycle, with a hook CodeDeploy-managed-automatic-launch-deployment-hook-DGENSVPC1b-f51a955c-194e-4a51-ad9b-1489101325ba autoscaling:EC2_INSTANCE_LAUNCHING,ABANDON,600
Using Amazon's AMI instead of custom AMI helped reduce this time to ~5-6mins from the previous 20mins.