Keeping GCE Preemptable instances powered on
Preemptive instances cost less, a lot less on Google Compute Engine. I've read up to 80%. As a test for our production cluster use I created this script, which uses the GCloud API.
This can be run from an instance with the appropriate permissions within gcloud, outside via a users cron, or using a service account.
Depending on your version of the gcloud api you may have to modify the gcloud commands slightly.
#!/bin/bash # # Script to check google cloud platform machines uptime via GCloud API # and start them if preempted, or user powers off. # # define instance name for script to check. INSTANCENAME="test" SECONDSBETWEENCHECKS=120 while :; do # get machine list from google cloud, parse out instance, look for terminated. if gcloud compute instances list | grep $INSTANCENAME | grep "TERMINATED"; then echo "---" date echo "API machine not running" echo "Sending gcloud commands to Google" # request google boot the machine. gcloud compute instances start $INSTANCENAME echo "sleeping..." sleep $SECONDSBETWEENCHECKS else echo "---" date echo $INSTANCENAME " is running I'm coo..." echo "sleeping..." sleep $SECONDSBETWEENCHECKS fi done
I have a writeup on making systemd unit files and enabling a service on boot. linked here