Scalable Infrastructure experts blog.

What is DenyHosts?

This is a python-script for the protection of  ssh server, like fail2ban, but consumes 

far less memory. The script parses the log file and finds failed login attempts and 

prohibits login from these IP addresses.

Installation steps.
Installation process is simple and contains some steps:

1. Retrieve new lists of packages

sudo apt-get update

2. Installation DenyHosts:

sudo apt-get install denyhosts

If the process is successfully completed, you will see the information of the screen:




After installation you can add your IP address in whitelist:
sudo nano /etc/hosts.allow
and insert following string:
sshd: 12.34.45.678
Where “12.34.45.678” – your IP address
And restart denyhost:
sudo service denyhosts restart
Configuration denyhosts.
After the installation process, the DenyHosts is ready to work, but some 
configuration options are noteworthy. All configuration values are in the file 
/etc/denyhosts.conf
1. PURGE_DENY: removed HOSTS_DENY entries that are older than this 
time.
Default value i…