Google app engine development server throws the following error whenever i try to run it

Question

I'm trying to create a webservice using webapp2 and datastore in python. But whenever i try to run "dev_appserver.py app.yaml" it throws me the following error

ERROR 2017-10-11 05:44:16,207 instance.py:280] Cannot connect to the instance on localhost:17514

But when i ran the same program using mac it working perfectly fine. Is I'm missing something here, Please find the screeenshot of components i have installed in gcloud.

Could somebody tell what i'm doing wrong here? I'm newbie to google cloud platform, if i am doing something wrong kindly point me to right direction. Any help would be appreciated. Thank you.

python 2.7.12 in linux and python 2.7.10 in macOS – Kishore Devaraj Oct 11 '17 at 06:22 — Kishore Devaraj, Oct 11 '17 at 06:22

score 1 · Answer 1 · answered Oct 11 '17 at 06:48

1

I see the same errors when trying to execute the dev_appserver.py from the Cloud SDK version 174.0.0.

However the dev_appserver.py from the standalone GAE SDK version 1.9.61 (theoretically the same being packed into the gcloud SDK 174.0.0) is running fine.

So one possible workaround to try would be to also install the standalone GAE SDK and run that dev_appserver.py instead.

Note: this is on linux, though, YMMV.

Related: What is the relationship between Google's App Engine SDK and Cloud SDK?

answered Oct 11 '17 at 06:48

Dan Cornilescu

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Is this problem only exists in this particular version of gcloud? If so, if I install the old gcloud will it solve the issue? – Kishore Devaraj Oct 11 '17 at 13:07
I'm unsure, I'm still using primarily the GAE SDK, only occasionally I switch to the cloud SDK... – Dan Cornilescu Oct 11 '17 at 14:41
Hm, I see it with 166.0.0 as well. Probably something specific to our environment... – Dan Cornilescu Oct 11 '17 at 14:43

score 1 · Accepted Answer · answered Oct 12 '17 at 05:03

1

The problem is fixed. Like @DanCornilescu said it's an environment issue. I deactivated the virtual environment. And It works fine with no issue.

answered Oct 12 '17 at 05:03

Kishore Devaraj

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score 0 · Answer 3 · answered Oct 08 '19 at 13:28

0

Solution for macOS. Maybe it works on Linux and Windows:

Find and remove folder:

appengine.None.<USER_NAME>

from the:

/var/folders

In may case:

/var/folders/6w/v0865mm96rj85dlwnr311bt00000gn/T/appengine.None.<USER_NAME>

answered Oct 08 '19 at 13:28

Ivan

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score 0 · Answer 4 · answered Mar 29 '20 at 23:18

I'm refactoring some of my old golang applications and I ran into this problem. I'd oversimplified the spin-up of my web server not realizing this is a critical block of code:

    // Critical to work on AppEngine
    port := os.Getenv("PORT")
    if port == "" {
        port = "8080"
        log.Printf("Defaulting to port %s", port)
    }
    log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), r))

Hope this helps.

Google app engine development server throws the following error whenever i try to run it

4 Answers4

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