This article is provided as a courtesy. Installing, configuring, and troubleshooting third-party applications is outside the scope of support provided by mt Media Temple. Please take a moment to review the Statement of Support. If you're having trouble with the steps in this article, additional assistance is available via Advanced Support, our premium services division. For more information on what Advanced Support can do for you, please click here. Fail2ban is a program that scans log files and bans IP address that show common signs of malicious activity -- hunting for exploits, too many password failures, and so forth. This guide will show you how to install Fail2ban to your DV server. Since the DV Developer is a self-administered hosting solution, you will first need to install Python to your DV Developer server to proceed. In the configuration process, you will also need to define your email address and log locations.
The jail mechanism is an implementation of FreeBSD 's OS-level virtualisation that allows system administrators to partition a FreeBSD -derived computer system into several independent mini-systems called jails , all sharing the same kernel, with very little overhead . It is implemented through a system call, jail 2 ,  as well as a userland utility, jail 8 ,  plus, depending on the system, a number of other utilities. Woolworth desire to establish a clean, clear-cut separation between their own services and those of their customers, mainly for security and ease of administration jail 8. Instead of adding a new layer of fine-grained configuration options, the solution adopted by Poul-Henning Kamp was to compartmentalize the system — both its files and its resources — in such a way that only the right people are given access to the right compartments. Jails were first introduced in FreeBSD version 4. Unlike chroot jail , which restricts processes to a particular view of the filesystem , the FreeBSD jail mechanism restricts the activities of a process in a jail with respect to the rest of the system. In effect, jailed processes are sandboxed. They are bound to specific IP addresses , and a jailed process cannot access divert or routing sockets. Raw sockets are also disabled by default, but may be enabled by setting the security.
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Advanced users might also be interested in configuring the way the so-called Fail2Ban jails are used to block IP addresses. A Fail2Ban jail is a combination of a filter and one or several actions. A filter defines a regular expression that matches a pattern corresponding to a failed login attempt or another suspicious activity. Actions define commands that are executed when the filter catches an abusive IP address. A jail can have active or inactive status. When Fail2Ban service is running, only active jails will be used to monitor the log files and to ban suspicious IP addresses. In Plesk, there are preconfigured jails for all hosting services web server, mail server, FTP server, and so on. Most of them work in the same way: they detect failed login attempts and block access to the service for ten minutes. Preconfigured jails for non-installed Plesk components are not shown in the list. For example, if RoundCube webmail is not installed, the plesk-roundcube jail is not shown in the list of available jails.