Tips To Protect Linux Servers Physical Console Access

Posted on in Categories Debian Linux, Hardware, Howto, Kde, Linux, Linux desktop, Linux distribution, package management, RedHat/Fedora Linux, Sys admin, Tips, Ubuntu Linux last updated March 12, 2009

This is an user contributed article.

Linux computer console is a physical device to operate a computer / server. Here are few steps which, if taken, make it more difficult for an attacker to quickly modify a system from its console.

Dealing with Recession – Saving Money With Free and Open Source Software

Posted on in Categories Debian Linux, Howto, Linux, Linux desktop, News, RedHat/Fedora Linux, Ubuntu Linux last updated March 2, 2009

According to wikipedia – “An economy which grows over a period of time tends to slow down the growth as a part of the normal economic cycle. An economy typically expands for 6-10 years and tends to go into a recession for about six months to 2 years”. The current defaults on homeloan have led to a major crisis in the US. Once recession started consumers lose confidence in the growth of the economy and spend less including technology and software. Is free and open source software (FOSS) a way to cut business costs? As concern about recession – even depression – deepens, more and more companies are asking this question. However, many have trouble knowing how to begin to find an answer.

Download Debian Linux 5 Lenny ISO / CD / DVD Images

Posted on in Categories Debian Linux, Download of the day, Linux, Linux desktop, Linux distribution last updated February 15, 2009

Debian GNU/Linux version 5.0 has been released ( jump to download ) after 22 months of constant development and available for download in various media format. Debian GNU/Linux is a free operating system which supports a total of twelve processor architectures and includes the KDE, GNOME, Xfce, and LXDE desktop environments. It also features compatibility with the FHS v2.3 and software developed for version 3.2 of the LSB.

Update: There is a newer software of this software available:
Download Debian Linux 7 Lenny ISO / CD / DVD Images

Debunking the "Linux is virus free" Myth

Posted on in Categories Debian Linux, Howto, Linux, Linux desktop, RedHat/Fedora Linux, Security, Shell scripting, Ubuntu Linux, Windows, windows vista last updated February 11, 2009

Is Linux is virus free? The author of foobar blog provides some insight about the same. Linux users can’t just catch a virus by email or downloading malware from the Internet, contrary to “those Windows users”. From the foobar blog post:

Then you save an email attachment under Linux, the execute flag is normally NOT set and thus, the file can’t be executed just by clicking on it. So, no luck?

How To Tail (View) Multiple Files on UNIX / Linux Console

Posted on in Categories data center, Debian Linux, Download of the day, fedora linux, File system, FreeBSD, Gentoo Linux, GNU/Open source, Howto, Linux, Linux Log Management, Monitoring, package management, RedHat/Fedora Linux, Suse Linux, Sys admin, Tip of the day, UNIX last updated February 9, 2009

The tail command is one of the best tool to view log files in a real time using tail -f /path/to/log.file syntax on a Unix-like systems. The program MultiTail lets you view one or multiple files like the original tail program. The difference is that it creates multiple windows on your console (with ncurses). This is one of those dream come true program for UNIX sys admin job. You can browse through several log files at once and do various operations like search for errors and more.

Important: Openssl Security Update [CVE-2008-5077]

Posted on in Categories CentOS, Debian Linux, fedora linux, FreeBSD, GNU/Open source, Howto, Linux, News, RedHat/Fedora Linux, Security Alert, Slackware, Suse Linux, Sys admin last updated January 8, 2009

Linux / BSD and UNIX like operating systems includes software from the OpenSSL Project. The OpenSSL is commercial-grade, industry-strength, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as general purpose cryptography library.

The Google security team discovered a flaw in the way OpenSSL checked the verification of certificates. An attacker in control of a malicious server, or able to effect a “man in the middle” attack, could present a malformed SSL/TLS signature from a certificate chain to a vulnerable client and bypass validation.

This update has been rated as having important security impact on FreeBSD, all version of Ubuntu / Debian, Red Hat (RHEL), CentOS, Fedora and other open source operating system that depends upon OpenSSL.

XEN Virtualization Set The MTU For xenbr0 Interface

Posted on in Categories CentOS, Debian Linux, fedora linux, Gentoo Linux, High performance computing, kernel, Linux, Linux Virtualization, Networking, RedHat/Fedora Linux, xen last updated December 31, 2008

I’ve already written about setting the MTU (Maximum Transmission Unit) under Linux including Jumbo frames (FreeBSD specific MTU information is here).

With this quick tip you can increase MTU size to get a better networking performance.

Debian GNU/Linux 4.0 Update 6 Released

Posted on in Categories Debian Linux, Linux distribution, Security, Security Alert last updated December 18, 2008

Didn’t take long to release new updated version.

The Debian project is pleased to announce the sixth update of its stable distribution Debian GNU/Linux 4.0 (codename “etch”). This update mainly adds corrections for security problems to the stable release, along with a few adjustment to serious problems. This update has been rated as having important security impact. You are advised to upgrade system ASAP.

Security Update: Debian Linux Kernel Local / Remote Vulnerabilities

Posted on in Categories Debian Linux, kernel, Linux distribution, Security Alert last updated December 4, 2008

Debian project today released a pair of security updates to plug at least ten security holes in its core called Linux kernel. Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. This update has been rated as having important security impact.