CentOS 7.0, enable iptables firewall

http://www.open-open.com/lib/view/open1411818940031.html
CentOS 7.0 uses firewall as the firewall by default, which is changed to iptables firewall here.

1. Turn off firewall:

systemctl stop firewalld.service #stop firewall

systemctl disable firewalld.service #prohibit firewall from starting

2. Install iptables firewall

yum install iptables-services #install

vi /etc/sysconfig/iptables #edit firewall configuration file

# Firewall configuration written by system-config-firewall

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state - -state ESTABLISHED,RELATED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

-A INPUT - m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host- prohibited

COMMIT

:wq! #Save and exit

systemctl restart iptables.service #Finally restart the firewall to make the configuration take effect

systemctl enable iptables.service #Set the firewall to start at

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