Linux操作汇集

                                            如何关闭某个占用端口的进程

1）查找被占用的端口：
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：
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
sudo kill -9 850

                                                         查看防火墙状态

查看防火墙状态 systemctl status firewalld
开启防火墙 systemctl start firewalld  
关闭防火墙 systemctl stop firewalld
开启防火墙 service firewalld start