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Yeah - Learn Linux: Maintain the integrity of filesystems
Yeah - Learn Linux: Maintain the integrity of filesystems
Learn how to check the integrity of your Linux filesystems, monitor free space, and fix simple problems. Use the material in this article to study for the Linux Professional Institute (LPI) 101 exam for Linux system administrator certification—or just to check your filesystems and keep them in good working order, especially after a system crash or power loss.
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Kernel APIs, Part 2: Deferrable functions, kernel tasklets, and work queues
Kernel APIs, Part 2: Deferrable functions, kernel tasklets, and work queues
For high-frequency threaded operations, the Linux® kernel provides tasklets and work queues. Tasklets and work queues implement deferrable functionality and replace the older bottom-half mechanism for drivers. This article explores the use of tasklets and work queues in the kernel and shows you how to build deferrable functions with these APIs.
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A comparison of virtualization features of HP-UX, Solaris, and AIX
A comparison of virtualization features of HP-UX, Solaris, and AIX
Most AIX administrators understand the virtualization features available to them on their System p platform through PowerVM, which is also available on the System p for Linux. What about the other UNIX hardware platforms? find out what HP-UX, Solaris have to offer and how do some of their features compare to PowerVM.
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AIX tips for Red Hat Enterprise Linux Admins
AIX tips for Red Hat Enterprise Linux Admins
Are you broadening your skills as a Linux systems administrator into various flavors of UNIX? Get a rundown of the differences and similarities between Red Hat Enterprise Linux and AIX so that you can perform day-to-day activities with ease.
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X WIndow System Internals
X WIndow System Internals
This week I have completed the "X Window Internals" tutorial. It is found at http://xwindow.angelfire.com/ This tutorial aims to fill the gap of Linux and other Unix-like systems source code commentaries when it comes to the graphic system. Although there is huge bibliography in the net and the textbooks for topics like Unix system programming, kernel programming, open source code, etc, I think there are not adequate references about the X11 graphics system internals. What my text provides is a study of the X server starting from main() and the interaction with the X Client and the input/output devices. Some of the strong points are: a complete example of a client request and the X server dispatching of the same Xlib request. I go as deep as much I could to the device drivers interface, for instance the screen driver and the mouse driver. The relationship of the framebuffers with the video card memory is explored. The mouse events creation and the compete path in the source until the events reach the client is followed. Some of the graphics Context operations that take place in the frame buffers are also examined. Christos Karayiannis
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Getting completely comfortable with Linux files and directories
Getting completely comfortable with Linux files and directories
This article grounds you in the basic Linux commands for manipulating files and directories. This article also helps you prepare for Objective 103.2 in Topic 103 of the Linux Professional Institute's Junior Level Administration (LPIC-1) exam 101.
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Monitoring logs and command output with multitail and watch
Monitoring logs and command output with multitail and watch
Monitoring system logs or the status of a command that produces file or directory output are common tasks for systems administrators. Learn how to use two popular open source tools simplify these activities for modern systems administrators: the multitail and watch commands.
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Scripting the Vim editor with Vmscript
Scripting the Vim editor with Vmscript
Vimscript is a mechanism for reshaping and extending the Vim editor. Scripting allows you to create new tools, simplify common tasks, and even redesign and replace existing editor features. This article introduces the fundamental components of the Vimscript programming language: values, variables, expressions, statements, functions, and commands. These features are demonstrated and explained through a series of simple examples.
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Finding rootfs during boot
Finding rootfs during boot
As a Linux administrator, you may encounter rootfs errors like cannot mount rootfs and kernel panic when you try to reboot a server after attaching volumes from external storage or even after installing a new Linux operating system. This article outlines the Linux booting process on an x86 platform, shows why this problem happens, and offers four tips to avoid it or fix it. This is a straightforward approach to finding a quick solution that can help you avoid a lot of grief.
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The key components of Multi-security based solutions for UNIX
The key components of Multi-security based solutions for UNIX
This article discusses the risk associated with the use of the same security mechanism in multifactor authentication systems and proposes the use of GSS-API as a suitable option for achieving the multi-security mechanism clubbed with multi-factor authentication for enhanced security for solutions designed over UNIX.
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10 tips from Benjamin Franklin for System Admins
10 tips from Benjamin Franklin for System Admins
Benjamin Franklin: author and printer, satirist, political theorist, politician, scientist, inventor, civic activist, statesman, diplomat, Freemason Grand Master... and would-be UNIX systems administrator? Yes, 200 years or so before the birth of UNIX, Franklin scribed sage advice to keep systems humming. Here are 10 of Franklin's more notable tips and how they can be applied to advanced system administraion.
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Perform uniform mounting with generic NFS
Perform uniform mounting with generic NFS
This article discusses the architecture and the mechanism behind a generic NFS mounter, a utility that will undoubtedly help the NFS clients by providing easier, one-point access to the files on the NFS server and by offering a more consolidated view of the NFS space. See how to automatically consolidate many different NFS versions into a uniform mount.
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Avoid virtualization overhead with Linux Containers
Avoid virtualization overhead with Linux Containers
Linux Containers provide lightweight virtualization that lets you isolate processes and resources without the need to provide instruction interpretation mechanisms and other complexities of full virtualization. In this step-by-step tour of Linux container tools (LXC), the author introduces you to the Linux container tools and shows how to get up and running on them. This article will show you how Linux containers significantly lower the overhead of using true virtualization, while still providing isolation.
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Implement two-factor authentication for AIX using Kerberos
Implement two-factor authentication for AIX using Kerberos
Kerberos is one of the most popular network authentication mechanisms. In this article, learn how to design a multi-factor authentication over the Kerberos protocol. Understand the use of One-Time Password (OTP) and GSS-API to achieve this.
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Take the Linux certification exam 102 with confidence
Take the Linux certification exam 102 with confidence
Welcome to the next step in studying for the Linux certification exam 102. In this tutorial (the sixth in a series of nine tutorials on exam 102 topics), Ian Shields introduces you to administrative tasks. By the end of this tutorial, you will know how to manage users and groups, set user profiles and environments, use log files, schedule jobs, back up your data, and maintain the system time.
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