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7.8 KiB

.. note::
Qinling (is pronounced "tʃinliŋ") refers to Qinling Mountains in southern
Shaanxi Province in China. The mountains provide a natural boundary between
North and South China and support a huge variety of plant and wildlife, some
of which is found nowhere else on Earth.
Qinling is Function as a Service for OpenStack. This project aims to provide a
platform to support serverless functions (like AWS Lambda). Qinling supports
different container orchestration platforms (Kubernetes/Swarm, etc.) and
different function package storage backends (local/Swift/S3) by nature using
plugin mechanism.
* Free software: Apache license
* Documentation: http://docs.openstack.org/developer/qinling
* Source: http://git.openstack.org/cgit/openstack/qinling
* Features: https://blueprints.launchpad.net/qinling
* Bugs: http://bugs.launchpad.net/qinling
* IRC channel: #openstack-qinling
Quick Start
A fast and simple way to try Qinling is to create a Vagrant VM including all
related components and dependencies of Qinling service. For your convenience,
Qinling team already provide a Vagrantfile in ``tools/vagrant`` folder.
Qinling is a FaaS implemented on top of container orchestration system such as
Kubernetes, Swarm, etc. Particularly, Kubernetes is a reference backend
considering its popularity. So, you need to setup Kubernetes first before
installing Qinling. The easiest way to setup Kubernetes is to use `Minikube
<https://kubernetes.io/docs/getting-started-guides/minikube/>`_, it runs a
single-node Kubernetes cluster inside a VM alongside Qinling vagrant VM, so
they can communicate with each other without any network configuration.
.. note::
In order to manage resources on Kubernetes, it is recommended to install
`kubectl <https://kubernetes.io/docs/tasks/tools/install-kubectl/>`_
command line tool.
Qinling can work with OpenStack Keystone for authentication, or it can work
without authentication at all. By default, authentication is disabled, config
``auth_enable = True`` to enable authentication.
After Kubernetes installation, perform the following commands on your local
#. Setup HTTP proxy to access the Kubernetes API:
.. code-block:: console
$ kubectl proxy --accept-hosts='.*' --address=''
Starting to serve on [::]:8001
.. end
#. Clone Qinling repo and go to ``vagrant`` directory:
.. code-block:: console
$ git clone https://github.com/LingxianKong/qinling.git
$ cd qinling/tools/vagrant
.. end
#. Modify Qinling sample config file according to your own environment. Suppose
your IP address of your local host is ````, default Kubernetes
API HTTP proxy port is ``8001``, and Qinling vagrant VM IP address is
```` (the default value in ``Vagrantfile``):
.. code-block:: console
$ sed -i 's/KUBERNETES_API_HOST/' qinling.conf.sample
$ sed -i 's/KUBERNETES_API_PORT/8001/' qinling.conf.sample
$ sed -i 's/QINLING_API_ADDRESS/' qinling.conf.sample
.. end
#. Now, start Qinling vagrant VM:
.. code-block:: console
$ vagrant up
.. end
Getting started with Qinling
**Currently, RESTful API is the only way to interact with Qinling,
python-qinlingclient is still under development.**
``httpie`` is a convenient tool to send HTTP request, make sure you installed
``httpie`` via ``pip install httpie`` before playing with Qinling.
Perform following commands on your local host, the process will create
runtime/function/execution in Qinling.
#. (Optional) Prepare a docker image including development environment for a
specific programming language. For your convenience, I already build one
(``lingxiankong/python-runtime``) in my docker hub account that you could
directly use to create runtime in Qinling. Only ``Python 2`` runtime is
supported for now, but it is very easy to add another program language
support. If you indeed want to build a new image, run the following commands
in ``qinling`` repo directory, replace ``DOCKER_USER`` with your own docker
hub username:
.. code-block:: console
$ cd runtimes/python2
$ docker build -t DOCKER_USER/python-runtime .
$ docker push DOCKER_USER/python-runtime
.. end
#. Create runtime. A runtime in Qinling is running environment for a specific
language, this resource is supposed to be created/deleted/updated by cloud
operator. After creation, check the runtime status is ``available``:
.. code-block:: console
$ http POST name=python2.7 \
HTTP/1.1 201 Created
Connection: keep-alive
Content-Length: 194
Content-Type: application/json
Date: Fri, 12 May 2017 04:37:08 GMT
"created_at": "2017-05-12 04:37:08.129860",
"id": "c1d78623-56bf-4487-9a72-1299b2c55e65",
"image": "DOCKER_USER/python-runtime",
"name": "python2.7",
"project_id": "default",
"status": "creating"
$ http GET
HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 246
Content-Type: application/json
Date: Fri, 12 May 2017 04:37:50 GMT
"created_at": "2017-05-12 04:37:08",
"description": null,
"id": "c1d78623-56bf-4487-9a72-1299b2c55e65",
"image": "DOCKER_USER/python-runtime",
"name": "python2.7",
"project_id": "default",
"status": "available",
"updated_at": "2017-05-12 04:37:08"
.. end
#. Create a customized function package:
.. code-block:: console
$ mkdir ~/qinling_test
$ cat <<EOF > ~/qinling_test/main.py
import requests
def main():
r = requests.get('https://api.github.com/events')
return len(r.json())
if __name__ == '__main__':
$ pip install requests -t ~/qinling_test
$ zip -r ~/qinling_test/qinling_test.zip ~/qinling_test/*
.. end
#. Create function, ``runtime_id`` comes from the output of above command:
.. code-block:: console
$ http -f POST name=github_test \
runtime_id=c1d78623-56bf-4487-9a72-1299b2c55e65 \
code='{"package": "true"}' \
HTTP/1.1 201 Created
Connection: keep-alive
Content-Length: 234
Content-Type: application/json
Date: Fri, 12 May 2017 04:49:59 GMT
"code": {
"package": "true"
"created_at": "2017-05-12 04:49:59.659345",
"description": null,
"entry": "main",
"id": "352e4c02-3c6b-4860-9b85-f72344b1f986",
"name": "github_test",
"runtime_id": "c1d78623-56bf-4487-9a72-1299b2c55e65"
.. end
#. Invoke the function by specifying ``function_id``:
.. code-block:: console
$ http POST \
HTTP/1.1 201 Created
Connection: keep-alive
Content-Length: 255
Content-Type: application/json
Date: Thu, 11 May 2017 23:46:12 GMT
"created_at": "2017-05-12 04:51:10",
"function_id": "352e4c02-3c6b-4860-9b85-f72344b1f986",
"id": "80cd55be-d369-49b8-8bd5-e0bfc1d20d25",
"input": null,
"output": "{\"result\": 30}",
"status": "success",
"sync": true,
"updated_at": "2017-05-12 04:51:23"
.. end
If you invoke the same function again, you will find it is much faster
thanks to Qinling cache mechanism.