Enable and disable the IPtables firewall and ports 3306, 80, and in Centos.

1. Enable and disable IPtables

1. Takes effect after restart

Enable: chkconfig iptables on

Close: chkconfig iptables off or chkconfig-level 35 iptables off

2. It takes effect immediately and becomes invalid after restart

Enable: service iptables start

Disable: service iptables stop

Temporarily disable the firewall:/etc/init. d/iptables stop

Restart iptables:/etc/init. d/iptables restart

2. View the firewall's iptables status:

/Etc/init. d/iptables status

3. Open ports 3306, 80, and in the IPtables firewall

/Sbin/iptables-I INPUT-p tcp-dport 80-j ACCEPT

/Sbin/iptables-I INPUT-p tcp-dport 22-j ACCEPT

/Sbin/iptables-I INPUT-p tcp-dport 3306-j ACCEPT

Then save:

/Etc/rc. d/init. d/iptables save

Well, the switch operation on the firewall in iptalbes is actually a very simple command with the same/sbin/iptables-I INPUT-p tcp-dport followed by a port, the other is simple acceptance. You can set it as needed.