unable to invoke action by docker

[axiqia]

Environment details:

• local deployment, Ubuntu 16.04.5 LTS
• Docker version 18.09.0, build 4d60db4

I can use dockerSkeleton to invoke docker actions following here. But when I try to invoke an action based on my own docker image, there is something wrong.

Steps to reproduce the issue:

1. $ cat hello.py

def main():
    greeting = "Hello " + "!"
    print(greeting)
    return {"greeting": greeting}

if __name__ == "__main__":
    main()

2. zip exec.zip hello.py

3. wsk action create hello exec.zip --docker axiqia/ubuntu:python3action

4. wsk action invoke hello -r
ok: invoked /_/hello, but the request has not yet finished, with id 119aefadbfbb4c049aefadbfbb7c04d8

5. wsk activation get 119aefadbfbb4c049aefadbfbb7c04d8

error: Unable to get activation '119aefadbfbb4c049aefadbfbb7c04d8': The requested resource does not exist. (code d9eb7cb32652189f3fd630f9c74831c9)

Thank you for help me!

[rabbah]

@axiqia is this a vanilla ubuntu image? If you use your own image, you need to implement this openwhisk proxy. See for details: https://github.com/apache/incubator-openwhisk/blob/master/docs/actions-new.md

you can also copy the proxy that's in the docker skeleton into your own image.

[axiqia]

@rabbah got it. I'll try it and report later.
BTW, the python3action runtime is built from alpine， and I need to use pyaudio which depends on libasound-dev, but I check the package here, it seems that the package is not supported by alpine, so I try to invoke the action by docker image ubuntu, is this the right way to do?

[rabbah]

certainly you can do that - you can take the python runtime's dockerfile and just change the base image and some of the commands to get the desired outcome.

[axiqia]

@rabbah ok, thank you so much.

[axiqia]

@rabbah
I use pythonAction here to build a docker image, and try to pass a zip file to invoke a action, but there is something wrong.

1. wget https://raw.githubusercontent.com/apache/incubator-openwhisk-runtime-python/master/core/pythonAction/Dockerfile
2. wget https://raw.githubusercontent.com/apache/incubator-openwhisk-runtime-python/master/core/pythonAction/pythonrunner.py
3. buildAndPush.sh axiqia/python3
4. cat exec.py

def main(args):
    name = args.get("name", "stranger")
    greeting = "Hello " + name + "!"
    print(greeting)
    return {"greeting": greeting}

5. zip exec.zip exec
6. wsk action create example exec.zip --docker axiqia/python3
7. wsk action invoke --result example --param name World

{
    "error": "The action failed to generate or locate a binary. See logs for details."
}

[axiqia]

The dockerskeleton base image is useful for actions that run scripts (e.g., bash, perl, python) and compiled binaries or, more generally, any native executable. It provides a proxy service (using Flask, a Python web microframework) that implements the required /init and /run routes to interact with the OpenWhisk invoker service. The implementation of these routes is encapsulated in a class named ActionRunner which provides a basic framework for receiving code from an invoker, preparing it for execution, and then running the code when required.

An implementation of the runner for Python actions is available here.

class PythonRunner(ActionRunner):

    def __init__(self):
        ActionRunner.__init__(self, '/action/__main__.py')
        self.fn = None
        self.mainFn = 'main'
        self.global_context = {}

So the python scripts much be named as __main__.py.