GCE: automatically suspend the underlying VM on idle

gce_idle_suspend.sh

#!/bin/sh

if [ $# -lt 2 ]; then
        echo "usage: $0 name zone [time]"
        exit 1
fi

# TODO: check if authenticated and suggest 'gcloud auth login'

name=$1
zone=$2
time=${3:-30}

do_suspend="gcloud beta compute instances suspend $name --quiet --zone $zone"

cnt=0
while true; do
        date
        #  0.00 0.01 0.11 1/187 628333
        cat /proc/loadavg
        grep -q '0.00 0.00 0.00' /proc/loadavg
        if [ $? = 0 ]; then
                cnt=$((cnt + 1))
        else
                cnt=0
        fi
        if [ $cnt -ge $time ]; then
                $do_suspend &
                sleep 20
                pkill -x gcloud
        fi
        sleep 60
done