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  CentOS 7 open ports
  Add Date : 2018-11-21      
  After upgrading to CentOS 7, I found it impossible to use the iptables control Linuxs port, after google found Centos 7 firewalld use instead of the original iptables. The following records how firewalld open Linux port:

Open ports

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

Command Meaning:

--zone # Scope

--add-port = 80 / tcp # Add port format: port / protocol

--permanent # permanent, after the failure Without this parameter to restart

Restart the firewall

firewall-cmd --reload
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