Pricing for the Google App Engine Flexible env, $ 500 lesson

Question

I followed the Nodejs tutorial for App Engine Flexible @: https://cloud.google.com/nodejs/getting-started/hello-world

Having successfully deployed and tested the tutorial, I slightly modified the code for the experiment and successfully deployed it ... and then left it working, since it was a testing environment (not public).

A month later, I received from Google an account worth more than $ 370!

In the details of the transaction, I see the following:

October 1–31, 2017 RAM for the Flex App Engine instance: 5948.774 Gibibyte-Hours ([MYPROJECT]) $ 42.24

October 1–31, 2017 Base hours for an App Engine Flex instance: 5,948.774 hours ([MYPROJECT]) $ 312.91

How did this testing environment with almost 0 requests take about 6,000 hours of resources? In the worst case scenario, I would suggest that 720 hours of full-time work during the month at $ 0.05 per hour would cost me ~ $ 40. https://cloud.google.com/appengine/pricing

Can anyone help shed some light on this? I could not figure out why there were so many resources?

Thanks for the help!

For more data, this is traffic for the last month (mainly 0):

And instance data

UPDATE: note that I made one modification to package.json: I added nodemon as a dependency and added it as part of my "nmp start" script. Although I doubt this explains the 6,000 hours of resources:

  "scripts": {
    "deploy": "gcloud app deploy",
    "start": "nodemon app.js",
    "dev": "nodemon app js",
    "lint": "samples lint",
    "pretest": "npm run lint",
    "system-test": "samples test app",
    "test": "npm run system-test",
    "e2e-test": "samples test deploy"
  },

App.yaml (by default - no change from the tutorial)

runtime: nodejs
env: flex

Answer 1

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runtime: nodejs
env: flex

# This sample incurs costs to run on the App Engine flexible environment.
# The settings below are to reduce costs during testing and are not appropriate
# for production use. For more information, see:
# https://cloud.google.com/appengine/docs/flexible/nodejs/configuring-your-app-with-app-yaml
manual_scaling:
  instances: 1
resources:
  cpu: 1
  memory_gb: 0.5
  disk_size_gb: 10

. : https://medium.com/google-cloud/three-simple-steps-to-save-costs-when-prototyping-with-app-engine-f flex-environment-104fc6736495

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Answer 2

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Answer 3

Also note that if you still want your application to have automatic scaling, but you do not want the minimum 2 instances to work by default at all times, you can configure your app.yaml as follows:

runtime: nodejs
env: flex
automatic_scaling:
  min_num_instances: 1