To restart the iptables firewall on a CentOS Linux server, you can use the service command with the iptables service name.
For example, to restart the iptables firewall, you can use the following command:
sudo service iptables restart
This will stop the iptables firewall, flush all rules, and then start the firewall again.
If you want to stop the iptables firewall temporarily, you can use the stop option instead of the restart option. For example:
sudo service iptables stop
This will stop the iptables firewall, but it will not flush the rules. To start the firewall again, you can use the start option:
sudo service iptables start
It's important to note that restarting the iptables firewall will terminate all existing connections, so be sure to save any unsaved work before restarting the firewall.
Alternatively, you can use the systemctl command to restart the iptables firewall. For example:
sudo systemctl restart iptables
This will stop the iptables firewall, flush all rules, and then start the firewall again. You can use the stop and start options with the systemctl command as well.
For example:
sudo systemctl stop iptables sudo systemctl start iptables
It's a good idea to restart the iptables firewall if you have made changes to your firewall rules and want them to take effect.