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CentOS / RHEL 7 : How to open a port in the firewall with firewall-cmd?

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Question: How to open a port in RHEL 7 using the firewall-cmd command?

Solution:

To begin with check the firewalld status using the systemctl command :

# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2016-10-29 21:47:04 IST; 1 weeks 4 days ago
 Main PID: 1055 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─1055 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

Oct 29 21:46:50 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewall daemon...
Oct 29 21:47:04 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall daemon.

Execute these commands to add a port to the firewall:
The command below will open the port effective immediately, but will not persist across reboots:

# firewall-cmd --add-port=[YOUR PORT]/tcp

For example, to open TCP port 2222 :

# firewall-cmd --add-port=2222/tcp

The following command will create a persistent rule, but will not be put into effect immediately:

# firewall-cmd --permanent --add-port=[YOUR PORT]/tcp

For Example, to open TCP port 2222 :

# firewall-cmd --permanent --add-port=2222/tcp
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