CentOS 7.x Basic firewalld configuration

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To configure basic protection via firewalld use:

1. Install firewalld if not present:

   yum -y install firewalld

2. Add 'ZONE=public' in appropriate ifcfg interface file under '/etc/sysconfig/network-scripts' folder
3. Use following for new zone settings to take effect

   systemctl restart network
   systemctl restart firewalld
   systemctl enable firewalld

4. Use following to validate that default zone is public

   firewall-cmd --get-default-zone

5. Use following syntax to allow certain ports from outside

   firewall-cmd --zone=public --add-port=25/tcp --permanent
   firewall-cmd --zone=public --add-port=80/tcp --permanent
   firewall-cmd --zone=public --add-port=443/tcp --permanent

6. Reload firewalld using

   firewall-cmd --reload

7. Check public zone rules using

   firewall-cmd --zone=public --list-all

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