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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