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Linux Mastering the Enterprise Volume Management System
Post date: April 13, 2005, 15:04 Category: System Views: 62
Tutorial quote: The Enterprise Volume Management System, or EVMS, is a disk, partition, and file system manager for Linux that claims to be a comprehensive tool for all disk management tasks. I ran across EVMS and found the idea appealing, so I decided to try it out. I've been working with it for a couple of weeks now, and this article describes what I found.
Unix+clones Execute Commands on Multiple Linux or UNIX Servers part II
Post date: December 28, 2005, 05:12 Category: System Views: 51
Tutorial quote: I have already covered how to execute commands on multiple Linux or UNIX servers via shell script. The disadvantage of script is commands do not run in parallel on all servers. However, several tools exist to automate this procedure in parallel. With the help of tool called tentakel, you run distributed command execution. It is a program for executing the same command on many hosts in parallel using ssh (it supports other methods too). Main advantage is you can create several sets of servers according requirements. For example webserver group, mail server group, home servers group etc. The command is executed in parallel on all servers in this group (time saving). By default, every result is printed to stdout (screen). The output format can be defined for each group.
Unix+clones Providing FTP Services with PureFTPd
Post date: April 15, 2005, 17:04 Category: Network Views: 39
Tutorial quote: If you work around computers for any length of time you'll probably run into an FTP server. FTP stands for File Transfer Protocol and FTP servers are used to do just that, transfer files. FTP has been around for a long time, much longer than P2P programs, or the World Wide Web, in its day it was the primary method of sharing files with others on the Internet, and it remains very popular even today. This tutorial will cover the installation and setup of an FTP server using PureFTPd.
Debian An apt-get primer
Post date: April 12, 2005, 13:04 Category: System Views: 90
Tutorial quote: If any single program defines the Debian Linux project, that program is apt-get. apt-get is Debian's main tool for installing and removing software. Working with the .deb package format, apt-get offers sophisticated package management that few Red Hat Package Manager RPM-based distributions can match.

Besides the convenience, an advantage of apt-get is that it reduces the chances of falling into dependency hell, that limbo where software installation fails for lack of another piece of software, whose installation fails for lack of another piece of software, and so on. If you know how Debian's archive system works, and how to choose the sources that apt-get uses, and use a few precautions in your upgrades, then the chances are that dependency problems will never bedevil you. Should you descend into dependency hell anyway, apt-get offers useful tools for climbing out of it.
Unix+clones Graphical Scripting with Kommander
Post date: April 12, 2005, 22:04 Category: Programming Views: 46
Tutorial quote: Kommander is a simplified and modified version of Qt Designer which lets you add scripting abilities to the dialogues it makes. It saves the result as a designer UI file which can be run with Kommander Executer. It is the easiest way to make simple programmes, I like to think of it as graphical shell scripting.

Konstuct is a program to download and install KDE from sources. This tutorial takes us through using Kommander to make a graphical program to configure and run Konstruct.
Debian Software RAID and Encrypted Filesystem Benchmarks
Post date: January 25, 2006, 18:01 Category: Benchmarks Views: 65
Tutorial quote: Both tests use bonnie++ to test the disks.

- Files Test: create, destroy, and stat 20,000 files in sequential and random order. File sizes are random between 0K and 15k. All files are created in a single directory.
- IO Test: read, write, rewrite, and seek in three 1GB size files.
- Load: all tests are starting with 0 cpu load. Load was then measured every 2 seconds for the duration of the test and averaged over all measurements.
Solaris Restoring a Sun system using JumpStart technology
Post date: April 13, 2005, 01:04 Category: Installing Views: 96
Tutorial quote: If a server crash and the file systems are corrupted or totally destroyed, then the only way to recover the data is to restore from backups. If it is only user data that is corrupted, the task is in general simple, but if the system disk fails, then there is a little bit more work involved in order to to recover the system. This article explains how to backup Sun systems using ufsrestore over NFS, and how to use Sun's JumpStart technology to restore Sun servers and workstations over the network.
Debian Manipulating the windows upon your desktop
Post date: January 19, 2006, 08:01 Category: Desktop Views: 79
Tutorial quote: If you're like me you'll most likely use a wide variety of desktop applications, and spend a lot of time setting up your desktop first thing in the afternoon when you login. Minimising some applications, setting others up to be visible upon all virtual desktops, etc. Even if you have a basic window manager you can automate this activity using Devil's Pie.

Devil's Pie is a simple utility, inspired by the Sawfish's matched windows option, which allows you to conduct actions upon desktop windows. Using it is a simple matter of creating a configuration file and starting the program when you login.
Linux Upstream Provider Woes? Point the Ping of Blame
Post date: April 14, 2005, 08:04 Category: Network Views: 42
Tutorial quote: Your users are complaining that "the Internet is, like, all slow." Users are always complaining, but you're seeing a lot of timeouts when you check mail, surf the Web, or try to log in for remote administration. Or even worse, latency is so bad that you keep getting killed all to heck in your favorite gory violent online multi-player game, so you know there is a problem. But there a lot of potential bottlenecks between your PC and the outside world, like your Internet gateway, proxy server, firewall, Internet service provider, and so forth, so where do you begin?

One of the best and most versatile network tools you can have is a notebook PC running Linux. This lets you plug in anywhere to run tests and find out what is going on. Make it a nothing-to-lose box--don't keep data on it so you can wipe and reinstall the operating system as necessary, because you want to be able to run tests outside of firewalls. Don't run any services. You can put a minimal iptables firewall on it, as there is no point in being totally exposed, but keep it simple. (Use MondoRescue to make a system snapshot for fast restores.)
Linux Monitoring and Managing Linux Software RAID
Post date: April 15, 2005, 19:04 Category: System Views: 56
Tutorial quote: Systems administrators managing a data center face numerous challenges to achieve required availability and uptime. Two of the main challenges are shrinking budgets (for hardware, software, and staffing) and short deadlines in which to deliver solutions. The Linux community has developed kernel support for software RAID (Redundant Array of Inexpensive Disks) to help meet those challenges. Software RAID, properly implemented, can eliminate system downtime caused by disk drive errors. The source code to the Linux kernel, the RAID modules, and the raidtools package are available at minimal cost under the GNU Public License. The interface is well documented and comprehensible to a moderately experienced Linux systems administrator.

In this article, I'll provide an overview of the software RAID implementation in the Linux 2.4.X kernel. I will describe the creation and activation of software RAID devices as well as the management of active RAID devices. Finally, I will discuss some procedures for recovering from a failed disk unit.