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Discover the possibilities of the /proc directory

Por administrador / admin@marvinlemos.net em 03/07/2009

"The /proc directory is a strange beast. It doesn't really exist, yet you can explore it. Its zero-length files are neither binary nor text, yet you can examine and display them. This special directory holds all the details about your Linux system, including its kernel, processes, and configuration parameters. By studying the /proc directory, you can learn how Linux commands work, and you can even do some administrative tasks."

Read the full article HERE

Fonte: linux.com

Publicado em: [ Linux ] [ Sysadmin ] [ Kernel ]
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Your First Loadable Kernel Module

Por administrador / admin@marvinlemos.net em 30/06/2009

"This is the first in a series of articles aimed at the beginning kernel programmer, designed to lead the kernel newbie through the basics of writing and compiling their first kernel module, and getting increasingly sophisticated from there. Everything that will happen in this space is meant to be fully hands-on, and you're all welcome to play along.

While I'll try to keep this series distro-agnostic, I'll admit up front that I have a tendency to do all my work under the latest version of Fedora, but translating to some other Linux distro should not be difficult.

And so, to work."

Leia o artigo completo AQUI.

Fonte: linux.com

Publicado em: [ Linux ] [ C ] [ Kernel ]
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Control your bandwidth with Trickle

Por administrador / admin@marvinlemos.net em 30/06/2009

"Ever had one of those situations where you pause for a moment, think back to a time long ago, and say, I wish I knew this back then? Even if you haven't, Trickle will trigger many such memories. With Trickle you can control the upload and download speeds for applications such that no single application hogs all the bandwidth. This gives you the power to ensure that downloads from Firefox don't interfere with your attempts to download a file through FTP.

Shaping bandwidth traffic is one of the mundane tasks of a system administrator, be it in a large corporate setting or a small office. In the present day and age, I doubt there's anyone who hasn't himself experienced, or heard someone they know moan about one of the users on the network hogging all bandwidth."

Leia o artigo completo AQUI.

Fonte: TUXRADAR.COM.

Publicado em: [ Linux ] [ Sysadmin ]
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Habilitando o [Ctrl]+[Alt]+[Backspace] no Ubuntu 9.04

Por administrador / admin@marvinlemos.net em 08/05/2009

"Usuários tradicionais do Ubuntu deverão notar especialmente a opção Don't zap. Se antigamente era possível abandonar o ambiente de trabalho usando o atalho de teclado [Ctrl]+[Alt]+[Backspace], para voltar à tela do gerenciador de login e, daí, ao GNOME, a nova versão do X.org acabou com essa possibilidade. Alguns usuários provavelmente não vão gostar dessa limitação. É claro que o kernel Linux pode assumir essa tarefa, por meio do atalho [Alt]+[PrtScr]+[K], que reinicia computadores travados quase que sem exceção — o problema é lembrar desse tipo de atalho.

Para reativar o atalho anterior, precisamos editar o arquivo de configuração /etc/X11/xorg.conf, incluindo no final dele as seguintes linhas:

Section "ServerFlags"
Option "DontZap" "False"
EndSection

Após reiniciar o sistema, o atalho [Ctrl]+[Alt]+[Backspace] deverá voltar a funcionar como de costume."

Publicado em: [ Linux ] [ Sysadmin ] [ Ubuntu ]
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Lazy Linux: 10 essential tricks for admins

Por administrador / admin@marvinlemos.net em 07/05/2009

"Learn these 10 tricks and you'll be the most powerful Linux® systems administrator in the universe...well, maybe not the universe, but you will need these tips to play in the big leagues. Learn about SSH tunnels, VNC, password recovery, console spying, and more. Examples accompany each trick, so you can duplicate them on your own systems.

The best systems administrators are set apart by their efficiency. And if an efficient systems administrator can do a task in 10 minutes that would take another mortal two hours to complete, then the efficient systems administrator should be rewarded (paid more) because the company is saving time, and time is money, right? "

Read the full article HERE

Source: IBM-Developer Works

Publicado em: [ Linux ] [ Sysadmin ]
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