Google Compute Engine Graceful Shutdown

This tool monitors an Instance Group for changes. The moment the given Instance Template is no longer part of the monitored Instance Group, on-shutdown is run. Afterwards the Instance is deleted via an API call.

It does not currently trigger if:

• Instance is deleted
• Instance is restarted
• Instance is re-created during autohealing

Motivation

Google Shutdown Scripts are unreliable and only run for 60-90s max.

Usage

./gce-graceful-shutdown -on-shutdown 'docker stop --time 30 my-container' -timeout 30s 

Variable	Description
-creds	Path to Google Service Account Credentials. Defaults to Application Credentials.
-on-shutdown	Required Command to run when instance is about to be deleted.
-timeout	Time to wait for -on-shutdown to finish. Default 10m.
-project	Manually set Google Project.
-region	Manually set Region.
-zone	Manually set Zone.
-instance-group	Manually set Instance Group.
-instance-template	Manually set Instance Template.
-instance	Manually set Instance.