How to check whether the port is open in centos system

Method 1:

Use the telnet command. Telnet fame and fortune can be used directly on Windows. If used on Linux, install it first (yum install -y telnet), Then use the following method to check whether the port is open.

telnet ip port

(Recommended tutorial: centos usage tutorial)

Method 2:

Use the nc command. The nc command usually also needs to be installed (yum install - y nc), the command is

nc -v ip port

Method 3:

Use the firewall command that comes with centos7

firewall-cmd --query-port=port/tcp

Recommended related video tutorials: linux video tutorial

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