Flex environment slow to turn off instances, is this normal?

[Rob Curtis]

Hi,

We've been experiencing very high costs on one of our google appengine flexible environment apps.

To try reduce the costs, I updated the app.yaml to the following:

runtime: custom

env: flex
entrypoint: gunicorn -b :$PORT main:app
resources:
  cpu: 1
  memory_gb: 1.0

automatic_scaling:
  min_num_instances: 1
  cool_down_period_sec: 60

I realise that the min number of instances is normally 2, and cool down period is normally 120seconds, but I was trying to establish whether this would help.

So I ran the application a few times, and 15 mins later I still have 4 instances running (with 0 traffic). Is this expected behaviour and does having these idle instances drive up cost?


Thanks
Rob

[Justin Beckwith]

Greetings! I would try making sure every instance belongs to the current version you're serving.  What does the output of `gcloud app versions list` look like?  Do you have multiple versions serving?

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Justin Beckwith | Google Cloud Platform | @justinbeckwith | http://jbeckwith.com

[Rob Curtis]

Hi Justin,

Perhaps it was other versions. I ran that command now and I see 3 version that have stopped and 1 is currently serving.

In future, should I review that list and shutdown any instances that aren't part of current version? How often does that happen (that other versions stay alive?)

Thanks

Rob

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[Justin Beckwith]

If you're running `gcloud app deploy`, by default we'll deploy the new version, migrate traffic to it, and shut down the previous version.  If they get started again via `gcloud app version start`, or if there's some kind of issue where the shutdown of the previous version fails, it's possible to end up in this state.  

On Fri, May 12, 2017 at 8:21 AM, Rob Curtis <robert...@gmail.com> wrote:

Hi Justin,

Perhaps it was other versions. I ran that command now and I see 3 version that have stopped and 1 is currently serving.

In future, should I review that list and shutdown any instances that aren't part of current version? How often does that happen (that other versions stay alive?)

Thanks

Rob

To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/CAFk6oqDGf%2BP6G%3D5bTKCKJO3oHkFOQS07VwFv4rS9h_fy5Wkp0Q%40mail.gmail.com.

For more options, visit https://groups.google.com/d/optout.