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Do Secure Delete Tools work with Journaled Filesystems?

Do Secure Delete Tools work with Journaled Filesystems?

Monday, October 4, 2010

2 Comments

I’ve been getting this question a lot since I posted several articles on how to securely delete data from Linux or Windows, and how to integrate secure file deletion in Nautilus. Many people have asked whether the journaling done by the filesystem makes these secure-delete tools ineffective. In this article I’ll explain whether this is […]

Sysadmins: Text Yourself When A Long Running Process Completes

Sat, Sep 20, 2014

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Introduction I occasionally find myself waiting several hours for a process to complete; sometimes it’s just a very lengthy ‘make’ command, but it more often some benchmark program that needs to run for a while before generating any useful results. I got tired of being chained to my computer while these things run, so I […]

Understanding Linux Memory Usage: Free, Cached, Buffered, and Hardware

Tue, Jan 21, 2014

5 Comments

One of the key components of system resource monitoring is memory usage. Knowing how much RAM is utilized helps you judge whether you have too many programs open, or if you need an upgrade. Linux provides several ways of obtaining this information, but there are some details you should be aware of when you interpret […]

Benchmarking LAN Network Connectivity in Linux

Mon, Jan 13, 2014

3 Comments

Occasionally it’s useful to determine the maximum speed of the network connection between two machines. I’ve used the following method on several occasions, generally as a method of troubleshooting. This quick howto will demonstrate a method to test the speed of a connection between two computers, using a very simple mechanism — netcat. What is […]

Managing SWAP Devices in Linux

Mon, Jan 13, 2014

2 Comments

I recently wrote about the Linux swap device and what it’s used for.  This tutorial covers the basics of actually managing the swap devices and/or files on your system.  Topics covered include how to enable and disable swap, how to create (and remove) additional swap space, and how to measure swap usage. Viewing and modifying […]

SWAP Devices Explained: Do I Need One?

Mon, Jan 6, 2014

11 Comments

The swap device – you probably have one, and you may have used it, but you may not know precisely what it is or whether you actually need it. Once upon a time, when a typical computer had only a few hundred megabytes of RAM, swap devices were critical to a machine’s performance and stability. […]

What LulzSec Teaches us About Network Security

Sun, Jun 26, 2011

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After fifty days of causing mayhem and running about the Internet unharmed, LulzSec has decided to disband as an organization. The constituent members remain at large, mind you, and surely they haven’t lost their taste for private data. There almost certainly will not be a reduction in break-ins, although they may now be more discrete. […]

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