Shulou(Shulou.com)06/03 Report--

1. Netstat installation

# yum install net-tools

2. # netstat-nlp

-n is displayed in numbers

-l lists only services in the Listen state

-p displays the program name of the connection

The Proto (protocol type) column indicates the protocol type. The common ones are tcp and udp.

The Local Address (current address) column represents the listening address and port, 0.0.0.0 represents all addresses on the host, and 127.0.0.1 represents the local address.

The State column indicates the status of the connection, and if the status value is LISTEN, the port / program / service has started normally.

The PID/Program name (process number / process name) column is the process number and program / service name of the program.

3. For example, to check whether the mysql service starts normally, you can execute the following command:

# netstat-nlp | grep mysql

4.-t option to filter out tcp connections, because mysql uses tcp protocol to connect: # netstat-ntlp | grep

Mysql

-u View udp protocol connection: # netstat-nulp | grep mysql

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