How To Install DenyHost on CentOS 6

r00t July 15, 2015

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For those of you who didn’t know, DenyHosts is a log-based intrusion prevention security tool for SSH servers written in Python. It is intended to prevent brute-force attacks on SSH servers by monitoring invalid login attempts in the authentication log and blocking the originating IP addresses. Due to the simplicity of DenyHost and the ability to manually configure your rules it is widely used as an alternative to Fail2ban which is a bit more complicated to use and configure.

This article assumes you have at least basic knowledge of linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you through the step by step installation DenyHost on CentOS  6 server.

Install DenyHost on CentOS 6

Step 1. First, you need to enable EPEL repository on your system  and make sure that all packages are up to date.

Step 2. Install DenyHost.

Install DenyHosts from EPEL repository by using following command:

Step 3. Configure DenyHosts.

Once the Denyhosts installed, make sure to whitelist your own IP address, so you will never get locked out. To do this, open a file /etc/hosts.allow:

Below the description, add the each IP address one-by-one on a separate line, that you never want to block. The format should be as follows:

You can further configure any settings in the DenyHosts.conf file by going to the following and updating according to your preference:

Save your work and restart DenyHosts with the following command:

View DenyHosts logs:

Congratulation’s! You have successfully installed DenyHost. Thanks for using this tutorial for installing DenyHost on CentOS 6 system. For additional help or useful information, we recommend you to check the official DenyHost web site.

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