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  CentOS 7.0 Close firewall is enabled by default iptables firewall
     
  Add Date : 2018-11-21      
         
       
         
  Operating system environment: CentOS Linux release 7.0.1406 (Core) 64 Wei
CentOS 7.0 is the default firewall as a firewall, iptables firewall to step here.

1, closed firewall:
systemctl stop firewalld.service # Stop firewall
systemctl disable firewalld.service # prohibit firewall boot
firewall-cmd --state # view the default firewall status (closed display notrunning, display running after opening)

2, iptables firewall (iptables here has been installed, configured below)
vi / etc / sysconfig / iptables # edit the firewall configuration file
# Sampleconfiguration for iptables service
# You can edit thismanually or use system-config-firewall
# Please do not askus to add additional ports / services to this default configuration
* Filter
: INPUT ACCEPT [0: 0]
: FORWARD ACCEPT [0: 0]
: OUTPUT ACCEPT [0: 0]
-A INPUT -m state - state RELATED, ESTABLISHED -j ACCEPT
-A INPUT -p icmp -jACCEPT
-A INPUT -i lo -jACCEPT
-A INPUT -p tcp -mstate --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -jACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8080-j ACCEPT
-A INPUT -j REJECT - reject-with icmp-host-prohibited
-A FORWARD -jREJECT --reject-with icmp-host-prohibited
COMMIT
:! Wq # Save and exit

Note: As used herein, ports 80 and 8080 for example. *** Add to some of the general - above or below "-A INPUT -p tcp -m state --state NEW -m tcp dport 22 -j ACCEPT" line, remember not to add to the last row, otherwise the firewall does not restart effect.
systemctlrestart iptables.service # final restart firewall configuration to take effect
systemctlenable iptables.service # firewall boot
     
         
       
         
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