CentOS7 tutorials on commands to view open ports, view port occupancy, open ports, kill processes and other commands.

The following is a tutorial on how to view open ports, view port occupancy, open ports and kill processes on CentOS 7:

1. View open ports:

   • Use the
     firewall-cmd command to view the ports open in the current firewall rules:

     sudo firewall-cmd --list-ports

2. Check port occupancy:

   • Use the
     netstat command to view the occupancy of all ports on the current system:

     netstat -tuln

   • If you only want to view the occupancy of the specified port, you can replace the port number with the port you want to view.

3. Open port:

   • Use the
     firewall-cmd command to open the specified port:

     sudo firewall-cmd --add-port=<port_number>/tcp --permanentsudo firewall-cmd --reload

     Replace
     <port_number></port_number> with the port number you want to open. The
     --permanent option will persist the modifications to the firewall configuration, and the
     --reload option will reload the firewall rules to make them effective.

4. Kill the process:

   • Use the
     ps command to find the PID of the process:

     ps -ef | grep <process_name>

     Replace
     <process_name></process_name> with the name of the process you want to kill.

   • Use the
     kill command to kill the process:

     sudo kill <PID>

     Replace
     <pid></pid> with the PID of the process to be killed.

Please note that when executing commands involving system configuration and process management, make sure you have sufficient permissions. At the same time, proceed with caution to avoid unforeseen effects on the system.

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