查看端口使用情况
    # netstat -ant
    Active Internet connections (servers and established)
    Proto Recv-Q Send-Q Local Address               Foreign Address             State
    tcp        0      0 0.0.0.0:33936                0.0.0.0:*                   LISTEN
    tcp        0      0 127.0.0.1:3306              0.0.0.0:*                   LISTEN
    tcp        0      0 0.0.0.0:111                    0.0.0.0:*                   LISTEN
    tcp        0      0 10.0.0.22:33831            207.46.107.42:1863          ESTABLISHED
    tcp        0      0 10.0.0.22:43127             219.133.60.250:80           ESTABLISHED
    tcp        0      0 10.0.0.22:42904             58.60.14.191:8000           ESTABLISHED
    tcp        0      0 :::111                      :::*                        LISTEN
    tcp        0      0 :::80                       :::*            &9 7 3 1 2 3 4 4 8 :