Linux查看端口占用情况

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一、查看linux的端口使用情况

[hadoop@server104 job]$ netstat -tln

--------------------------------------------------------------------------------

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:51822 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 :::50060 :::* LISTEN
tcp 0 0 :::50030 :::* LISTEN
tcp 0 0 :::111 :::* LISTEN
tcp 0 0 :::22 :::* LISTEN
tcp 0 0 ::1:631 :::* LISTEN
tcp 0 0 ::ffff:192.168.1.104:19001 :::* LISTEN
tcp 0 0 ::1:25 :::* LISTEN
tcp 0 0 ::ffff:127.0.0.1:44698 :::* LISTEN
tcp 0 0 :::50010 :::* LISTEN
tcp 0 0 :::50075 :::* LISTEN
tcp 0 0 :::33534 :::* LISTEN
tcp 0 0 :::37376 :::* LISTEN
tcp 0 0 :::39395 :::* LISTEN
tcp 0 0 :::50020 :::* LISTEN
tcp 0 0 :::55044 :::* LISTEN
tcp 0 0 ::ffff:192.168.1.104:50090 :::* LISTEN

Netstat -tln 命令是用来查看linux的端口使用情况，

netstat -a 查看所有的服务端口

netstat -an | grep 端口号来检验下是不是已经打开了某某端口

service xxx start 或者 /etc/init.d/xxx start是开启xxx某端口

iptables -A INPUT --dport xxx -j DROP
iptables -A OUTPUT --dport xxx -j DROP是关闭xxx端口

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