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I am using google cloud load balancer to Auto scale instances in GCP. I have setup a Instance group of max 6 instances. When a instance is created, it runs a startup script (To install nginx, php, mongo, psql, composer, clone project).

Google Cloud load balancer forwards request to new instances firing up before the completion of automation script.

Is there a way to forward the request only after the Startup script has completed ?

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The workaround I can think of in this situation is the cool down period. According to this document,

The cool down period is the number of seconds the autoscaler should wait after a virtual machine has started before the autoscaler starts collecting information from it.

Editing instance group for Cool-down period

However, it will be required to find out what value to put in this field which will give enough time for the new instances to fire up completely.

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