启动swift服务的时候出现Exception: Could not bind to 0.0.0.0:8080 after trying for 30 seconds

sudo swift-init restart main

Traceback (most recent call last):
File "/usr/local/bin/swift-proxy-server", line 10, in <module>
execfile(__file__)
File "/home/swift/swift/bin/swift-proxy-server", line 23, in <module>
sys.exit(run_wsgi(conf_file, 'proxy-server', **options))
File "/home/swift/swift/swift/common/wsgi.py", line 878, in run_wsgi
error_msg = strategy.bind_ports()
File "/home/swift/swift/swift/common/wsgi.py", line 480, in bind_ports
self.sock = get_socket(self.conf)
File "/home/swift/swift/swift/common/wsgi.py", line 201, in get_socket
bind_addr[0], bind_addr[1], bind_timeout))
Exception: Could not bind to 0.0.0.0:8080 after trying for 30 seconds

swift@ubuntu:~$ sudo netstat -ltnp | grep 8080
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      3251/python
swift@ubuntu:~$ ps -wlp 3251
F S   UID    PID   PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
0 S  1001   3251      1  1  80   0 - 22488 poll_s ?        00:01:28 swift-proxy-ser
swift@ubuntu:~$ sudo kill -9 3251
swift@ubuntu:~$ sudo netstat -ltnp | grep 8080
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      3256/python
swift@ubuntu:~$ ps -wlp 3256
F S   UID    PID   PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
1 S  1001   3256      1  0  80   0 - 22950 poll_s ?        00:00:00 swift-proxy-ser
swift@ubuntu:~$ sudo kill -9 3256
swift@ubuntu:~$ sudo netstat -ltnp | grep 8080