View source for Red Hat / Centos firewall

<source lang="text">
Try this command
firewall-cmd --permanent --zone=public --add-rich-rule="rule family="ipv4" \
source address="1.2.3.4/32" \
port protocol="tcp" port="4567" accept"
Check the zone file later to inspect the XML configuration
cat /etc/firewalld/zones/public.xml
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'''Reference - https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7'''<br>
firewall-cmd --state<br>
sudo systemctl start firewalld.service<br>
firewall-cmd --get-default-zone<br>
firewall-cmd --get-active-zones<br>
firewall-cmd --list-all<br>
firewall-cmd --get-zones<br>
firewall-cmd --zone=home --list-all<br>
sudo firewall-cmd --zone=home --change-interface=eth0<br>
firewall-cmd --get-active-zones<br>
 If the firewall is completely restarted, the interface will revert to the default zone:
    sudo systemctl restart firewalld.service
    firewall-cmd --get-active-zones
 output
 public
  interfaces: eth0 eth1
sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0<br>
ZONE=

sudo systemctl restart network.service<br>
sudo systemctl restart firewalld.service<br>

sudo firewall-cmd --set-default-zone=home<br>

    sudo firewall-cmd --zone=public --add-service=https
    sudo firewall-cmd --zone=public --permanent --add-service=https


'''Adding services'''<br>
firewall-cmd --get-services<br>
/usr/lib/firewalld/services directory. <br>
    sudo firewall-cmd --zone=public --permanent --add-port=5000/tcp
    sudo firewall-cmd --zone=public --permanent --add-port=4990-4999/udp
    sudo firewall-cmd --zone=public --permanent --list-ports
Useful to define a service.