python - 在后台运行 python 脚本

Question

我的脚本是一个监听客户端请求并发送响应的服务器。它通过线程处理请求:

class Server:

def __init__(self):
    self.host = ''
    self.port = 50000
    self.backlog = 5
    self.size = 1024
    self.server = None
    self.threads = []

def open_socket(self):
    try:
        self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.server.bind((self.host,self.port))
        self.server.listen(5)
    except socket.error, (value,message):
        if self.server:
            self.server.close()
        print "Could not open socket: " + message
        sys.exit(1)

def run(self):
    self.open_socket()
    input = [self.server,sys.stdin]
    running = 1
    while running:
        inputready,outputready,exceptready = select.select(input,[],[])

        for s in inputready:

            if s == self.server:
                # handle the server socket
                c = Client(self.server.accept())
                c.start()
                self.threads.append(c)

            elif s == sys.stdin:
                # handle standard input
                junk = sys.stdin.readline()
                running = 0 

    # close all threads

    self.server.close()
    for c in self.threads:
        c.join()

class Client(threading.Thread):
def __init__(self,(client,address)):
    threading.Thread.__init__(self)
    self.client = client
    self.address = address
    self.size = 1024

def run(self):
    running = 1
    while running:
        data = self.client.recv(self.size)
        if data:
    data2 = data.split()
    if data2[0] == 'Hello':
            status = 'Hello'
                #fetch from database users by location 
                reply= '6'


        if data2[0] == 'Index':
                status = 'Index'
        #fetch from database users by location 
            reply='I'

        db = MySQLdb.connect(host="localhost", # your host, usually localhost
                        user="root", # your username
                        passwd="Rambo_9134", # your password
                        db="secure_login") # name of the data base

        # you must create a Cursor object. It will let
        #  you execute all the queries you need
        cur = db.cursor() 

        # Use all the SQL you like
        cur.execute("SELECT ml.member,m.username FROM locations l JOIN memberlocation ml ON(l.id = ml.location) JOIN members m ON(m.id = ml.member) where l.id = 1;")
        # print all the first cell of all the rows
        data = []
        for row in cur.fetchall() :
                print row[1]
            data.append({row[0]:row[1]})
            print 'JSON', json.dumps(data)
        reply = data        


        self.client.send(json.dumps(reply))
        else:
            self.client.close()
            running = 0

if __name__ == "__main__":
s = Server()
s.run()

这个脚本运行完美，但当我按下 enter 时它停止了。我尝试了很多替代方案:守护进程、nohup、……我无法让它作为后台服务运行。我认为这是一个编程问题

如何让这个脚本作为服务在后台运行？

Answer 1

要在测试/开发环境中快速简便地使用 screen。

screen -S mySessionName

这将启动一个名为 mySessionName 的新屏幕 session 并附加到该 session 。在此 session 中，您现在可以运行您的代码。

使用 Ctrl+A, D 从该 session 中分离。您的代码将继续运行。

要重新附加到该 session ，请使用:

screen -r mySessionName

要显示所有 session ，请使用:

screen -ls

但是在生产环境中，您应该查看 supervisor。这serverfault question可能有帮助。