A, iptables firewall
1, the basic operation
# Check firewall status
service iptables status
# Stop firewall
service iptables stop
# Enable the firewall
service iptables start
# Restart the firewall
service iptables restart
# Permanently turn off the firewall
chkconfig iptables off
# Permanently closed after restart
chkconfig iptables on
2, open port 80
Vim / etc / sysconfig / iptables
# adding the following code
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
Save and exit reboot the firewall
service iptables restart
two, firewall firewall
1, see the firewall service status
systemctl status firewalld
Appears Active: active (running) cut highlighted it means is activated state.
Appears Active: inactive (dead) in gray stop, look at the words will do.
2, see the firewall status
cmd---state Firewall
3, turn on, restart, shut down, firewalld.service service
# Enable
Service firewalld Start
# Restart
Service firewalld restart
# Close
Service firewalld STOP
4, View firewall rule
All --list-cmd-Firewall
5, query, open and closed ports
# Query whether the port open
Firewall-cmd --query-Port = 8080 / tcp
# 80 open ports
Firewall-cmd = --permanent --add-Port 80 / tcp
# remove port
firewall-cmd --permanent --remove- = 8080 Port / TCP
# restart firewall (firewall modified configured to restart)
firewall-cmd --reload
# of parameters
1, firwall-cmd: the operation is a tool provided for Linux firewall;
2, - Permanent: expressed to durable;
. 3, - the Add-port: port identification added;
Original: https: //blog.csdn.net/bbwangj/article/details/74502967