linux security

Linux security tutorials


Here are some Linux security tutorials:

Install and configure Squid in Slackware

This is a guide on how to create Slackware Squid package using scripts from, install it in Slackware 13.37 (also Slackware64 14.1) and configure the squid.conf configuration file. It is just a basic configuration to get Squid cache proxy server works. Advanced setting is not included. You should read and at least understand some basic of Squid before try this step by step guide. Here is Squid-cache website. Before we begin, please make sure you have these basic requirements:

How to upgrade software or install security patches for Slackware Linux

You can always use Slackware package management tool such as slackpkg to upgrade software or install security patches for your Slackware system. However, the ftp server mirrors took sometimes to update the latest software or security patches to their server. So the best way is to upgrade them yourself. This is an example on how to upgrade software or install security patches for Slackware Linux. First thing you need to do is to subscribe the Slackware security mailing list from Slackware website.

Setup firewall in Ubuntu using ufw

There are two types of firewalls available in Linux, a packet filtering firewall and a proxy-based firewall. Most Linux users use a packet filtering firewall to setup a basic firewall for their system because Linux already came with firewall package by default.

Linux kernel came with a module called netfilter. Netfilter is used to manipulate incoming and outgoing traffic in Linux system. You can use locate command to find netfilter in your Linux system like in the example below:

Linux file and directory permissions

Linux permission is a very interesting topic. It is part of Linux security and mandatory knowledge for Linux administration. Linux permission controls all files and directories in the Linux system. So every Linux user must understand how Linux permission works including end user, who only uses desktop application or x-window.

Basic Linux security

Computer security has become a critical subject in information technology system these days. If we looked back in history, the security threat has started a long time ago during 1970s when telephone system has been hacked. Many computer crimes happened and as a result, the Computer Fraud and Abuse Act has been made in 1980s. As technology advanced, the evolution of computer networking and the born of Internet, the threats to information and networks have risen significantly.

Linux administration - File and directory ownership

Linux file and directory ownerships guide

Managing file and directory ownerships are important administration task in Linux. Setting up ownership means give security to a file or directory.

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