How to open port in built-in firewall on the RedHat machine?
Mon, Jan 24, 2022
2-minute read
To check the current state of the RedHat built-in firewall, you need to call the below command:
sudo firewall-cmd --list-all
You should get something like this:
[[email protected] ~]$ sudo firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: eth0
sources:
services: cockpit dhcpv6-client ssh
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
You can also check iptables with sudo iptables-save | grep <port_number> command.
To add new rule you need to call the below commands (remembering to update the port number):
sudo firewall-cmd --zone=public --add-port=8080/tcp --permanent
sudo firewall-cmd --reload
The result should be like below:
[[email protected] ~]$ sudo firewall-cmd --zone=public --add-port=8080/tcp --permanent
success
[[email protected] ~]$ sudo firewall-cmd --reload
success
When you will check the firewall state, the new port should be visible:
[[email protected] ~]$ sudo firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: eth0
sources:
services: cockpit dhcpv6-client ssh
ports: 8080/tcp
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
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