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Linux

The Linux /proc Filesystem as a Programmers' Tool

Post date: June 22, 2005, 09:06 Category: Programming Views: 3368 Comments
Tutorial quote: My entry into systems programming was guided by my desire to understand further the operating systems I was working with daily as a contract UNIX and, later, Linux system administrator. The result of this was ifchk, a packet sniffer detector I wrote in C and released in June of 2003. ifchk initially was written under IRIX and then ported to Linux, mostly under the 2.4 kernel. The current ifchk revision, beta 4, recently was released and beta 5 is on the way.

My work on ifchk has allowed me to examine programmatically several areas of operating system functionality. Examples include the Linux netlink(7) and rtnetlink(7) facilities, device control--that is, network interfaces--via ioctl(2), signals and proc, the process filesystem. Proc and its ability to display a wide array of data concerning the runtime state of a system are the focus of our discussion here.
Linux

Running .Net applications on Linux with Mono

Post date: April 26, 2006, 13:04 Category: Software Views: 2616 Comments
Tutorial quote: Imagine the fate of your company rests on your completing your new Linux project on time. You have a crack team of first-class developers, but they're all .Net programmers. What are you going to do? Admit that Windows is better that Linux? Cry? Resign? No, you're going to install Mono and save the world!
Linux

Filesystem snapshots with unionfs

Post date: July 2, 2005, 01:07 Category: System Views: 2835 Comments
Tutorial quote: Many times, you need to know how a certain filesystem looked like at some point in time, and you want to be able to roll back changes that happened to it after that point. While there are multiple solutions to achieve this goal, certainly one of them is to use filesystem snapshots.
SuSe

Working with SUSE Linux Enterprise Server 9

Post date: June 22, 2005, 09:06 Category: System Views: 3465 Comments
Tutorial quote: Working with SUSE Linux Enterprise Server (SLES) requires an understanding of the login process, including local account files, system accounts, and managing identities.

Using a console shell or the graphical environment are two possible methods of working on a SLES machine.

Finding your way around a SLES installation requires an in-depth knowledge of the filesystem layout. Essential filesystem components are documented and explained in this chapter. Basic filesystem permissions are also described.
Ubuntu

How to Upgrade to Alsa 1.0.20 on Ubuntu Jaunty 9.04

Post date: August 14, 2009, 18:08 Category: Installing Views: 1652 Comments
Tutorial quote: Advanced Linux Sound Architecture (known by the acronym ALSA) is a Linux kernel component intended to replace the original Open Sound System (OSS) for providing device drivers for sound cards. If you are experiencing sound issues on Ubuntu Jaunty 9.04 or just want the latest version, you may want to upgrade to ALSA 1.0.20 (Ubuntu Jaunty comes with Alsa version 1.0.18rc3 - you can check this by typing this in a terminal: cat /proc/asound/version). Read on!
Debian

Monitoring your filesystem for unauthorised change

Post date: July 15, 2006, 05:07 Category: Security Views: 2873 Comments
Tutorial quote: If you're running a stable server and are worried about an intruder modifying your system binaries to install new corrupted versions you should be using a filesystem integrity checker.
Linux

Filesystem Encryption Tools for Linux

Post date: May 28, 2007, 00:05 Category: System Views: 3411 Comments
Tutorial quote: Crypto filesystems keep your data safe – even if someone steals your computer.Linux offers a number of encrypted filesystem options – each with a different approach to the encryption problem.Encrypted filesystems may be overkill
for family photos or your résumé, but they make sense for network-accessible servers that hold sensitive business
documents, databases that contain credit-card information, offline backups, and laptops.
Debian

Boot On BTRFS With Debian

Post date: August 2, 2009, 11:08 Category: Miscellaneous Views: 2899 Comments
Tutorial quote: This tutorial will explain you how to boot from a BTRFS filesystem with kernel 2.6.31-RC4 and BTRFS 0.19. BTRFS is a new filesystem with some really interesting features like online defragmenting and snapshots. BTRFS is an experimental filesystem, use at your own risk. The kernel used is also experimental.
Linux

Benchmarking Filesystems Part II

Post date: January 6, 2006, 22:01 Category: Benchmarks Views: 4696 Comments
Tutorial quote: After the last article was published, I have received more than a dozen requests for a second filesystem benchmark using the 2.6 kernel. Since that time, I have converted entirely to XFS for every Linux machine I use, so I may be a bit bias regarding the XFS filesystem. I tried to keep the hardware roughly the same. Instead of a Western Digital 250GB and Promise ATA/100 controller, I am now am using a Seagate 400GB and Maxtor ATA/133 Promise controller. The physical machine remains the same, there is an additional 664MB of swap and I am now running Debian Etch. In the previous article, I was running Slackware 9.1 with custom compiled filesystem utilities. I've added a small section in the beginning that shows the filesystem creation and mount time, I've also added a graph showing these new benchmarks. After the first round of benchmarks, I received a sleuth of e-mails asking for the raw numbers. The numbers are now included in tables at the end of this e-mail for both the last and current set of benchmarks.
Ubuntu

How to Create a Private Encrypted Folder On Ubuntu 8.10

Post date: March 5, 2009, 08:03 Category: System Views: 3916 Comments
Tutorial quote: eCryptfs is a POSIX-compliant enterprise-class stacked cryptographic filesystem for Linux.It provides advanced key management and policy features. eCryptfs stores cryptographic metadata in the header of each file written, so that encrypted files can be copied between hosts; the
file will be decryptable with the proper key, and there is no need to keep track of any additional information aside from what is already in the encrypted file itself. Think of
eCryptfs as a sort of gnupgfs.eCryptfs is a native Linux filesystem. The kernel module component of eCryptfs is part of the Linux kernel since 2.6.19.
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