How to check port status in linux

#Linux uses the netstat command to view port status.

The parameters of the netstat command are described as follows:

-a: List all network status, including Socket programs;

-c seconds Number: Specify how many seconds to refresh the network status;

-n: Use IP address and port number to display, do not use domain name and service name;

-p: Display PID and program name ;

-t: Display the connection status of the TCP protocol port;

-u: Display the connection status of the UDP protocol port;

-I: Display only the listening status Connection;

-r: Display routing table;

The netstat command can be combined with grep to view a specific port and service status.

netstat -ntlp //查看当前所有tcp端口
netstat -ntulp |grep 80 //查看所有80端口使用情况
netstat -anp | grep 3306 //查看所有3306端口使用情况

Check which services and ports are on a server

netstat -lanp

Check how many ports a service has. For example, you want to check mysqld

ps -ef |grep mysqld

to check the number of connections on a certain port. For example, 3306 port

netstat -pnt |grep :3306 |wc

checks the connection client IP of a certain port. For example, port 3306

netstat -anp |grep 3306

View network port

netstat -an

Recommended tutorial: linux tutorial

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