Here in this small post , i will discuss about taht how to port open in latest RHEL 7 or CentOs 7 or Fedora version firewall . some users want to open ports or some of user wants to open port for services like http, ftp , ssh etc..
I am going to explain below for open port or add services in firewalld.
Find Active Zone in firewalld :
In centos 7 , rhel 7 or latest firewalld , you will get zone name .zone name can be dmz,public or others. if you get dmz zone from name and you want to open port like 3444, then execute below command for open port in dmz zone.
#firewall-cmd --zone=dmz --permanent --add-port=3444/tcp
and then we need to reload service of firewall for changing effect.