我试图为dar设置一个远程备份服务器,along these lines。如果可能的话,我真的想用python来做所有的管道工作,但是我已经问过separate question这个问题。恶魔化服务器中的python子进程死锁
在subprocess.Popen(cmd, shell=True)
中使用netcat,我成功地进行了差异备份,就像dar网站上的示例一样。仅有的两个问题是:
- 我不知道如何动态地这样
- 分配端口号。如果我在后台执行的服务器,它失败。为什么?
更新:这似乎与netcat没有关系;即使没有netcat,它也会挂起。
这里是我的代码:
from socket import socket, AF_INET, SOCK_STREAM
import os, sys
import SocketServer
import subprocess
class DarHandler(SocketServer.BaseRequestHandler):
def handle(self):
print('entering handler')
data = self.request.recv(1024).strip()
print('got: ' + data)
if data == 'xform':
cmd1 = 'nc -dl 41201 | dar_slave archives/remotehost | nc -l 41202'
print(cmd1)
cmd2 = 'nc -dl 41200 | dar_xform -s 10k - archives/diffbackup'
print(cmd2)
proc1 = subprocess.Popen(cmd1, shell=True)
proc2 = subprocess.Popen(cmd2, shell=True)
print('sending port number')
self.request.send('41200')
print('waiting')
result = str(proc1.wait())
print('nc-dar_slave-nc returned ' + result)
result = str(proc2.wait())
print('nc-dar_xform returned ' + result)
else:
result = 'bad request'
self.request.send(result)
print('send result, exiting handler')
myaddress = ('localhost', 18010)
def server():
server = SocketServer.TCPServer(myaddress, DarHandler)
print('listening')
server.serve_forever()
def client():
sock = socket(AF_INET, SOCK_STREAM)
print('connecting')
sock.connect(('localhost', 18010))
print('connected, sending request')
sock.send('xform')
print('waiting for response')
port = sock.recv(1024)
print('got: ' + port)
try:
os.unlink('toslave')
except:
pass
os.mkfifo('toslave')
cmd1 = 'nc -w3 localhost 41201 < toslave'
cmd2 = 'nc -w3 localhost 41202 | dar -B config/test.dcf -A - -o toslave -c - | nc -w3 localhost ' + port
print(cmd2)
proc1 = subprocess.Popen(cmd1, shell=True)
proc2 = subprocess.Popen(cmd2, shell=True)
print('waiting')
result2 = proc2.wait()
result1 = proc1.wait()
print('nc<fifo returned: ' + str(result1))
print('nc-dar-nc returned: ' + str(result2))
result = sock.recv(1024)
print('received: ' + result)
sock.close()
print('socket closed, exiting')
if __name__ == "__main__":
if sys.argv[1].startswith('serv'):
server()
else:
client()
这里的服务器上会发生什么:
$ python clientserver.py serve &
[1] 4651
$ listening
entering handler
got: xform
nc -dl 41201 | dar_slave archives/remotehost | nc -l 41202
nc -dl 41200 | dar_xform -s 10k - archives/diffbackup
sending port number
waiting
[1]+ Stopped python clientserver.py serve
这里的客户端上会发生什么:
$ python clientserver.py client
connecting
connected, sending request
waiting for response
got: 41200
nc -w3 localhost 41202 | dar -B config/test.dcf -A - -o toslave -c - | nc -w3 localhost 41200
waiting
FATAL error, aborting operation
Corrupted data read on pipe
nc<fifo returned: 1
nc-dar-nc returned: 1
客户端也挂了,我必须用键盘中断来杀死它。
为什么python需要参与? 'dar - | nc'和'nc -l |达尔似乎简单得多。 –
@gringo,它_seems_更简单,但我不想手动调用所有备份。克朗不够聪明。在bash中编写备份服务器会非常痛苦。那么你究竟在暗示什么? –
cron有什么问题?我没有看到为套接字使用nc和python,为什么不是其中一个? –