Linux firewall status check method example

How to check the status of Linux firewall

1. Basic Operations

# View 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 turn off the firewall chkconfig iptables off
# Permanently shut down and restart 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 restart the firewall

service iptables restart

2. Firewall

1. Check the firewall service status

systemctl status firewalld

If Active: active (running) is highlighted, it means it is in the startup state.

Active: inactive (dead) in gray means stop, you can also look at the words.

2. Check the status of the firewall

firewall-cmd --state

3. Start, restart, or shut down firewalld.service

# Enable service firewalld start# Restart service firewalld restart# Disable service firewalld stop

4. Check firewall rules

firewall-cmd --list-all

5. Query, open, and close ports

# 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. Firewall-cmd: It is a tool provided by Linux to operate firewall;

2. --permanent: indicates that it is set to be persistent;

3. --add-port: identifies the added port;

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