Keeps a GCP instance alive. Useful for preemptible instances

keepalive.py

import os
from googleapiclient import discovery

os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "./service-account-key.json"
HOSTNAME = "example.com"
GCP_PROJECT = 'project_name'
GCP_INSTANCE_ZONE = 'instance_zone'
GCP_INSTANCE_NAME = 'instance_name'


def check_ping():
    response = os.system(F"ping -c 1 {HOSTNAME} > /dev/null")
    # if response == 0:
    #     pingstatus = "Network Active"
    # else:
    #     pingstatus = "Network Error"
    # return pingstatus
    return response


is_server_alive = True if check_ping() == 0 else False
if (is_server_alive == False):
    print("Instance stopped - sending request to start")
    service = discovery.build('compute', 'v1')
    request = service.instances().start(project=GCP_PROJECT, zone=GCP_INSTANCE_ZONE, instance=GCP_INSTANCE_NAME)
    response = request.execute()
else :
    print("Instance is still up, exiting")

print("Finished keepalive check")

keepalive.sh

#!/bin/bash
source ./venv/bin/activate
python keepalive.py