python Gunicorn服务器使用方法详解


						1. 简介



Gunicorn(Green Unicorn)是给Unix用的WSGI HTTP 服务器，它与不同的web框架是非常兼容的、易安装、轻、速度快。



2. 示例代码1







def app(environ, start_response):

  data = b"Hello World\n"

  start_response("200 OK", [

    ("Content-Type", "test/plain"),

    ("Content-Length", str(len(data)))

  ])

  return iter([data])



启动





gunicorn -w 4 myapp:app



起来后显示





[2016-12-12 00:20:12 +0000] [11755] [INFO] Starting gunicorn 19.6.0

[2016-12-12 00:20:12 +0000] [11755] [INFO] Listening at: http://127.0.0.1:8000 (11755)

[2016-12-12 00:20:12 +0000] [11755] [INFO] Using worker: sync

[2016-12-12 00:20:12 +0000] [11760] [INFO] Booting worker with pid: 11760

[2016-12-12 00:20:12 +0000] [11761] [INFO] Booting worker with pid: 11761

[2016-12-12 00:20:12 +0000] [11762] [INFO] Booting worker with pid: 11762

[2016-12-12 00:20:12 +0000] [11763] [INFO] Booting worker with pid: 11763



此时，调用http://127.0.0.1:8000





$curl http://127.0.0.1:8000

Hello World



参数说明

-w 处理HTTP请求的worker进程数，以下两种启动方式等价





gunicorn -w 4 myapp:app

gunicorn --workers=4 myapp:app



参考：





 -w INT, --workers INT

            The number of worker processes for handling requests.



问题：为何调用 http://ip:8000不行呢， 这个是什么请求呢？

默认有-b参数，参考





 -b ADDRESS, --bind ADDRESS

            The socket to bind. [['127.0.0.1:8000']]



以下方式启动就可以用ip的方式启动了





sudo gunicorn -w 2 -b 0.0.0.0:4000 myapp:app



3. 示例代码2



之前简单的flask方法





from flask import Flask

app = Flask(__name__)



@app.route('/hello.world')

def check():

  return 'hello world!'





if __name__ == '__main__':

  app.run()



启动





$sudo gunicorn -b 0.0.0.0:300 -w 4 myapp3:app

[2016-12-18 19:19:51 +0000] [21005] [INFO] Starting gunicorn 19.6.0

[2016-12-18 19:19:51 +0000] [21005] [INFO] Listening at: http://0.0.0.0:300 (21005)

[2016-12-18 19:19:51 +0000] [21005] [INFO] Using worker: sync

[2016-12-18 19:19:51 +0000] [21010] [INFO] Booting worker with pid: 21010

[2016-12-18 19:19:51 +0000] [21011] [INFO] Booting worker with pid: 21011

[2016-12-18 19:19:51 +0000] [21014] [INFO] Booting worker with pid: 21014

[2016-12-18 19:19:51 +0000] [21017] [INFO] Booting worker with pid: 21017



测试





$curl localhost:300/hello.world

hello world!



4. 启动异常





[ERROR] Connection in use: ('127.0.0.1', 8000)



原因之一是之前启动的进程没有杀死。

注：ctrl+z 是挂起进程，但没有终止。ctrl+c是终止进程。

如果使用了ctrl+z再回到进程中可使用fg命令，这样可以用ctrl+c来关闭进程

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