Local development failing when trying to run a custom runtime app

[GoogleCodeExporter]

When trying to run a custom runtime app, I get the following error:

`ValueError: The --custom_entrypoint flag must be set for custom runtimes`

I'm not seeing a place anywhere in the documentation that guides me as to how 
to correctly configure this.

I've created my `app.yaml` as well as a `Dockerfile` that I'm able to run 
outside of the local development server.  The dockerfile produces an image that 
is listening on port 8080 as is required by the brief instructions found here: 
https://cloud.google.com/appengine/docs/managed-vms/custom-runtimes

Have there been any undocumented changes for getting local development for 
custom runtimes working, or is it possible this is a bug?

Original issue reported on code.google.com by atrauzzi on 13 Nov 2015 at 12:15

[GoogleCodeExporter]

Sorry for the slow response here.

Custom runtimes are a rapidly evolving product, and as such, the documentation 
is a little less organized than we'd like.

We're getting rid of support for local development of custom runtimes via 
dev_appserver.py. As you're seeing, it's brittle and confusing; we'd rather 
wait until we can do local development right, rather than ship a half-working 
product. Eventually we'll have a solution for this use case.

See the following email thread for a discussion of your options: 
https://groups.google.com/forum/#!topic/google-cloud-sdk/rY0dTXeh1nI

Original comment by z...@google.com on 24 Nov 2015 at 10:06

• Changed state: WorkingAsIntended