Common commands for Linux firewall settings

Check firewall status: service firewalld status

 

 

Start the firewall: servicefirewalld start

 

Turn off the firewall: service firewalld stop

 

 

Restart the firewall:

 

 

Open port 80 :

firewall-cmd --zone=public --add-port=80/tcp--permanent

 

 

Check port status: n etstat -tunlp

  

centos to check the port occupancy: netstat -anltup | grep 80