CENTOS7, configure the firewall, open the port

The 1.CENTOS7 version strengthens the firewall, no longer uses the original iptables, enables the firewall

1. View open ports (no ports are open by default)
Firewall-cmd--list-ports
2. Open 80 port
firewall-cmd--zone=public (scope)--add-port= 80/TCP (port and Access type)--permanent (permanently Effective)
3. Reboot firewall
firewall-cmd--reload
4. Stop firewall
systemctl stops Firewalld.service
5. Disable firewall boot
systemctl disable Firewalld.service
6. Delete
firewall-cmd--zone= Public--remove-port=80/tcp--permanent

2.centos7 the following version

1. Open 80,22,8080 port
/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 8080-j ACCEPT
2. Saving
/etc/rc.d/init.d/iptables
Save 3. View the open port
/etc/init.d/iptables status
4. Turn off firewall 
1 permanent and will not be restored after reboot
: Chkconfig iptables
on Close: Chkconfig iptables off
2) immediate effect, reboot after restart
: Service iptables start
shutdown: Service iptables stop