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Install Config Server Firewall (CSF) on a Linux VPS

install Config Server Firewall
Install Config Server Firewall on a Linux VPS

Security is one of the most important things you need to think about if you have an online business.  Let’s learn how to install Config server (CSF) firewall on Linux VPS!

Install Config Server Firewall (CSF)

The best security practices for ensuring your server is protected includes an advanced firewall service. In this tutorial, we will teach you how to install the Config Server Firewall (CSF), which is one of the most advanced firewall services for a Linux VPS.
The installation procedure is very easy and is not too time-consuming, so if you are prepared, we may begin.
You might be interested to see our more guides and tutorials;

  1. Linux Crontab: A Complete 5 minute tutorial
  2. How to install LDAP on CentOS 7


For today’s tutorial, we will be using a CentOS VPS, but do not worry if you are using another Linux distribution on your VPS – it should work without any issues.
The first thing you have to do is update all of your system software to the latest version available. To do this, carry out the command below.

yum update

After running this command, your system will be up to date and you can commence the installation of Config Server Firewall. Go to your ‘/root’ directory.

cd /root

Download the Config Server Firewall

Once you are in your ‘/root’ directory, you may download the Config Server Firewall from the official web site. To do this,  carry out the command below.

wget https://download.configserver.com/csf.tgz

The next thing you have to do is to unpack the archive.

tar -zxvf csf.tgz

Go into the newly made directory on your Linux VPS.

cd csf/

Initiate the Installation script.

sh install.sh

After a couple of seconds, the Config Server Firewall will be installed on your Linux VPS and it will be prepared for use.

Init Scripts

Like many other services, Config Server Firewall can be started, stopped, or restarted using init scripts. For example, to start your Config Server Firewall, you could use the following command.

/etc/init.d/csf start

If you want to stop your Config Server Firewall, simply run the command below.

/etc/init.d/csf stop

Or, should you ever want to restart your Config Server Firewall service, simply execute the command below.

/etc/init.d/csf restart

The main Configuration File

Like a lot of other Linux services, you may configure Config Server Firewall to meet your needs. The main configuration file is stored in your ‘/etc’ directory under ‘/csf’.


Particular IP Adress

Lastly, we are going to teach you how to use Config Server Firewall. If you want to allow a particular IP address to access your Linux VPS, use the following command.


Please remember to replace IP_ADDRESS with your own IP address.
If you want to block certain IP addresses, use the following command.


Once again, remember to replace IP_ADDRESS with your own IP address.
In the end, if you want to reload all of the rules, simply execute the following.

csf -r

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Updated on December 23, 2018

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