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我正在使用 Python Flask 通过 FCGI 和 nginx 运行 Python for web。我的 fcgi 后端是这样设置的:

#!/usr/bin/env python
import argparse, daemon, os
from flup.server.fcgi import WSGIServer
from fwd_msg import app

SOCKET_LOCATION = '/tmp/fingerprinter-fcgi.sock'

if __name__ == '__main__':
    # arg parse (and daemonize)
    arg_parser = argparse.ArgumentParser()
    arg_parser.add_argument('--daemon', action='store_true', default=False, help='Run as daemon')
    arg_parser.add_argument('--cwd', action='store', default='/', 
                            help='Full path of the working directory to which the process should change on daemon start.')
    arg_parser.add_argument('--uid', action='store', type=int, default=os.getuid(),
        help='The user ID ("UID") value and group ID ("GID") value to switch the process to on daemon start.')
    args = vars(arg_parser.parse_args())

    if args['daemon']:
        context = daemon.DaemonContext(working_directory=args['cwd'], uid=args['uid'])
        with context:
            WSGIServer(app, bindAddress=SOCKET_LOCATION).run()
    else:
        WSGIServer(app, bindAddress=SOCKET_LOCATION).run()

如果我在没有 daemon 参数的情况下运行 WSGIServer,它工作正常。

但是,如果我使用 daemon 参数运行它,我会在 nginx 日志中收到此错误,而对服务器的任何请求都以“502 BAD GATEWAY”结尾:

2012/05/09 12:16:00 [error] 30895#0: *30 upstream sent unsupported FastCGI protocol version: 91 while reading response header from upstream, client: XXX.XXX.XXX.XXX, server: localhost, request: "POST / HTTP/1.1", upstream: "fastcgi://unix:/tmp/fingerprinter-fcgi.sock:", host: "XXX.XXX.XXX.XXX"

任何想法为什么会发生这种情况以及如何防止它?

4

1 回答 1

0

事实证明,DaemonContext 关闭了所有打开的文件描述符,所以基本上应该有一个函数来实例化 WSGIServer,以及应用程序和所有可以在 DaemonContext 内部打开文件描述符的东西。

还要确保工作目录归用户所有,或者至少具有允许具有给定 UID 的用户在其中写入的权限(不推荐)。

例子:

#!/usr/bin/env python
import argparse, daemon, os
from flup.server.fcgi import WSGIServer
from fwd_msg import app

SOCKET_LOCATION = '/tmp/fingerprinter-fcgi.sock'

def main():
    app = flask.Flask(__name__)
    @app.route('/', methods=['GET'])
    def index():
        pass # your actions here

if __name__ == '__main__':
    # arg parse (and daemonize)
    arg_parser = argparse.ArgumentParser()
    arg_parser.add_argument('--daemon', action='store_true', default=False, help='Run as daemon')
    arg_parser.add_argument('--cwd', action='store', default='/', 
                            help='Full path of the working directory to which the process should change on daemon start.')
    arg_parser.add_argument('--uid', action='store', type=int, default=os.getuid(),
        help='The user ID ("UID") value and group ID ("GID") value to switch the process to on daemon start.')
    args = vars(arg_parser.parse_args())

    if args['daemon']:
        context = daemon.DaemonContext(working_directory=args['cwd'], uid=args['uid'])
        with context:
            main()
    else:
        main()
于 2012-05-11T14:59:47.657 回答