1）查找被占用的端口：
abloume@ubuntu:~$ netstat -tln | grep 8000
tcp 0 0 192.168.2.106:8000 0.0.0.0:* LISTEN
2）查看被占用端口的PID：
abloume@ubuntu:~$ sudo lsof -i:8000
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
nginx 850 root 6u IPv4 15078 0t0 TCP 192.168.2.106:8000 (LISTEN)
nginx 851 www-data 6u IPv4 15078 0t0 TCP 192.168.2.106:8000 (LISTEN)
nginx 852 www-data 6u IPv4 15078 0t0 TCP 192.168.2.106:8000 (LISTEN)
3）kill掉该进程
abloume@ubuntu:~$ sudo kill -9 850
