What are the methods to check the firewall status in Linux?

How to check the firewall status in Linux: 1. iptables firewall, check the firewall status, the code is [service iptables status]; 2. Firewall firewall, the code is [firewall-cmd --state].

The operating environment of this tutorial: linux7.3 system, DELL G3 computer.

How to check the firewall status in Linux:

1. iptables firewall

1. Basic operations

# Check the firewall status

service iptables status

# Stop the firewall

service iptables stop

# Start the firewall

service iptables start

# Restart the firewall

service iptables restart

# Permanently close the firewall

chkconfig iptables off

# Restart after permanent shutdown

chkconfig iptables on　　

2. Open port 80

vim /etc/sysconfig/iptables

# Add the following code

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

Save and exit and then restart the firewall

service iptables restart

2. Firewall firewall

1. Check the firewall service status

systemctl status firewalld

AppearActive: active (running)Highlighted means it is started state.

AppearsActive: inactive (dead)Gray means stop, you can also read the word.

2. Check the status of firewall

firewall-cmd --state

3. Open, restart, close, firewalld.service service

# Open

service firewalld start

# Restart

service firewalld restart

# Close

service firewalld stop

4. Check the firewall rules

firewall-cmd --list-all

5. Query, open and close the port

# Check whether the port is open

firewall-cmd --query-port=8080/tcp

# Open port 80

firewall-cmd --permanent --add-port=80/tcp

# Remove port

firewall-cmd --permanent --remove-port=8080/tcp

#Restart the firewall (restart the firewall after modifying the configuration)

firewall-cmd --reload

Parameter explanation

1. firwall-cmd: It is a tool provided by Linux to operate the firewall;

2. permanent: Indicates that it is set to persistent;

3 , add-port: identifies the added port;

Related learning recommendations: linux video tutorial

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