Managed vms custom runtime

####Getting Started

#####clone git repo

git clone https://github.com/cage1016/managed-vms-custom-python

#####run managed vm locally

must sure you have installed gcloud SDK and update preview components

gcloud preview app run .

####Developing code for custom runtimes

Building Custom Runtimes - Google App Engine — Google Cloud Platform

There are few notice mentioned in offical documentation you have to manual setup if you want to use custom managed vms runtime. 1) listen to part 8080 2) start and stop requests 3) health requests check.

the following demo is a simple go througth to show how to build a custom managed vms runtime.

#####standard VM runtimes ######app.yaml

application: <your application id>
module: <your module name>
version: 1
runtime: python27
api_version: 1
threadsafe: yes
vm: true

...

When you use gcloud to run or deploy a managed VM application based on a standard runtime (in this case Python27), the SDK will create a minimal Dockerfile using the standard runtime as a base image. You'll find this Dockerfile in your project directory:

######Dockerfile

# Dockerfile extending the generic Python image with application files for a
# single application.
FROM google/appengine-python27

ADD . /app

#####custom VM runtimes

To create a custom VM runtime application, you have to modify app.yaml configuration file with following settings:

######app.yaml

runtime: custom
vm: true

You can reuse Dockerfile that SDK created for you or create your new one. Here, we will use google/python base image and extend custom VM runtimes Dockerfile

######Dockerfile

FROM google/python

RUN apt-get update && apt-get install -y -q --no-install-recommends

WORKDIR /app
RUN virtualenv /env

ADD requirements.txt /app/requirements.txt
RUN pip install --upgrade pip
RUN /env/bin/pip install -r requirements.txt

# Adds the rest of the application source
ADD . /app

ENTRYPOINT ["/env/bin/python", "/app/main.py"]

######requirements.txt

WebOb
Paste
webapp2

As mentioned before. we have to listen port 8080 and manual setup start, stop and health requests in main.py file

######main.py

import webapp2


class HomeHandler(webapp2.RequestHandler):

    def get(self):
        self.response.out.write('work')


class HealthCheckHandler(webapp2.RequestHandler):

    def get(self):
        self.response.write('ok')


routes = [
    (r'/_ah/health', HealthCheckHandler),
    (r'/_ah/stop', HealthCheckHandler),
    (r'/_ah/start', HealthCheckHandler),
    (r'/.*', HomeHandler)
]

app = webapp2.WSGIApplication(routes,
                              debug=True)


def main():
    from paste import httpserver

    httpserver.serve(app, host='0.0.0.0', port='8080', start_loop=True)


if __name__ == '__main__':
    main()

####Reference