Linux firewall open/close designated port

Linux firewall open/close designated port

1. View firewall status

   firewall-cmd --state
   

2. If it is running, specify the port that needs to be opened, which --permanetmeans permanent effect, if you don’t want it, you can leave it alone

   firewall-cmd --permanent --zone=public --add-port=8080/tcp
   

3. Restart firewall

   firewall-cmd --reload 
   

4. View open ports

   firewall-cmd --permanent --zone=public --list-ports