The Linux zone on the developerWorks website is your resource for information on Linux programming and system administration.
|Articles||06 Dec 2013|
|DB2 10.1 for Linux, UNIX, and Windows DBA certification exam
611 prep, Part
1: Server management
This tutorial helps you learn the skills required to manage DB2 database servers, instances and databases. Furthermore, you will get introduced to DB2 autonomic computing capabilities and you will learn to use IBM data Studio to perform database administration tasks such as job scheduling and generating diagrams of access plans. This tutorial prepares you for Part 1 of the DB2 10.1 DBA for Linux, UNIX, and Windows certification exam 611.
|Articles||05 Dec 2013|
SoftLayer: Manually migrate Linux instances from SCE to SoftLayer
Learn how to manually migrate a Red Hat Enterprise Linux (RHEL) VM instance from IBM SmartCloud Enterprise to IBM SoftLayer.
|Articles||11 Nov 2013|
|Migrate to SoftLayer: Migrating Red Hat Enterprise Linux VM instances from SCE to SoftLayer using Racemi Cloud Path service
Learn how to migrate your Red Hat Enterprise Linux 5.x or 6.x instances safely from IBM SmartCloud Enterprise to IBM SoftLayer.
|Articles||30 Oct 2013|
|Recover from a failed Linux boot
If your Linux computer fails to boot after a kernel upgrade, disk swap, or other system change, you're not helpless. The Grand Unified Bootloader (GRUB) gives you ways to control the boot process and recover. Or, if necessary, emergency boot disks that you create with an external tool can come to the rescue. Learn procedures and GRUB commands that can help you boot in problem situations, and find out about a life-saving external tool for BIOS-based systems.
|Articles||22 Oct 2013|
|Common threads: Awk by example, Part 1
Awk is a very nice language with a very strange name. In this first article of a three-part series, Daniel Robbins will quickly get your awk programming skills up to speed. As the series progresses, more advanced topics will be covered, culminating with an advanced real-world awk application demo.
|Articles||11 Oct 2013|
|Debugging tools and techniques for Linux on Power
Debugging is a major software development activity, which as an application developer, you cannot avoid. Effective debugging can not only shorten the software development cycle, but can also save costs. This article introduces techniques for locating bugs in user-space C/C++ and Java(TM) applications and describes some of the debugging tools available on Linux(TM) for POWER(TM) architecture.
|Articles||02 Oct 2013|
|Create LaTeX documents graphically with LyX
LyX is a graphical tool, with a familiar drop-down and content-driven menu system, for writing and editing LaTeX documents. TeX and its higher-level macro language, LaTeX, are powerful document markup languages that are the de facto standard for Linux
|Articles||16 Aug 2013|
|Automate and manage systems installation with Cobbler
Cobbler simplifies system provisioning by centralizing the tasks that are involved in setting up and administering an installation server. This article discusses some of Cobbler's features, how to install it, and how to create a configuration suitable for automatically installing multiple client machines.
|Articles||07 Jun 2013|
|Multi-disk management for IBM Systems Director VMControl: Part 3
IBM® Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping reduce IT management complexity and cost. IBM Systems Director VMControl is an advanced plug-in installed on top of IBM Systems Director to provide the virtualization capabilities. This tutorial talks about the multi-disk support while deploying workload using the VMControl Representational State Transfer (REST) application programming interfaces (APIs) and command-line interface (CLI).
|Tutorial||28 May 2013|
|Multi-disk management for IBM Systems Director VMControl: Part 2
IBM Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping reduce IT management complexity and cost. VMControl is a advanced plug-in installed on top of IBM Systems Director to provide the virtualization capabilities. This tutorial talks about the multi-disk management and revision control for capturing virtual appliances using the VMControl Representational State Transfer (REST) application programming interfaces (APIs) and command line interface (CLI).
|Tutorial||14 May 2013|
|Multi-disk management for IBM Systems Director VMControl: Part 1
IBM Systems Director is a platform management solution that is used to manage physical and virtual systems. IBM Systems Director provides systems management personnel with a single pane of glass, helping reduce IT management complexity and cost. IBM Systems Director VMControl™ is an advanced plug-in installed on top of IBM Systems Director to provide virtualization capabilities. This tutorial talks about multi-disk management for virtual server using the VMControl Representational State Transfer (REST) application programming interfaces (APIs) and command-line interface (CLI).
|Tutorial||06 May 2013|
|Open source desktop publishing with Scribus
Scribus is an open source, graphical desktop publishing (DTP) tool that focuses on layout, frames, styles, color management, and intercolumn document flow. Scribus is free software that runs on the Linux, Windows, and Mac OS X platforms, and provides most of the capabilities of traditional DTP tools at no cost.
|Articles||16 Apr 2013|
|Using Linux in a Windows world
Linux is the operating system of choice for most servers on the Internet and is growing in popularity as a desktop operating system. However, simply migrating to Linux on your desktop doesn't guarantee that you can still interact with all of the enterprise resources that your job or interests may require. This article discusses additional configuration tasks that you may need to undertake to interact with legacy Microsoft Windows files and file servers and use new network hardware from your desktop Linux system.
|Articles||03 Apr 2013|
|Process real-time big data with Twitter Storm
Storm is an open source, big-data processing system that differs from other systems in that it's intended for distributed real-time processing and is language independent. Learn about Twitter Storm, its architecture, and the spectrum of batch and stream processing solutions.
|Articles||02 Apr 2013|
|IBM AIX device driver development
This tutorial illustrates the IBM® AIX® device driver framework and related application programming interfaces (APIs). Here, we shall discuss about the device switch structure, API to register device switch methods, major and minor number management, and moving data from kernel to user space.
|Tutorial||28 Mar 2013|
|Bash by example, Part 2
In his introductory article on bash, Daniel Robbins walked you through some of the scripting language's basic elements and reasons for using bash. In this, the second installment, Daniel picks up where he left off and looks at bash's basic constructs like conditional (if-then) statements, looping, and more.
|Articles||18 Feb 2013|
|Learn Linux, 101: Search text files using regular expressions
Learn how to use regular expressions, and then use them to find things in files on your filesystem. You can use the material in this article to study for the LPI 101 exam for Linux system administrator certification, or just to learn for fun.
|Articles||18 Feb 2013|
|IBM Systems Director VMControl resource lifecycle management: part 4
IBM Systems Director is a platform management solution that is used to manage physical and virtual systems in a multisystem environment. It supports various virtualization technologies and multiple operating systems across IBM and non-IBM platforms. IBM Systems Director VMControl is an advanced manager of IBM Systems Director, a free-to-own set of platform management tools. This tutorial is part of a series on VMControl resource lifecycle management. This tutorial explains about server system pool lifecycle using the VMControl Representational State Transfer (REST) application programming interfaces (APIs).
|Tutorial||04 Feb 2013|
|IBM Systems Director VMControl resource lifecycle management: part 3
IBM Systems Director is a platform management solution that is used to manage physical and virtual systems in a multisystem environment. It supports various virtualization technologies and multiple operating systems across IBM and non-IBM platforms. IBM Systems Director VMControl is an advanced manager of IBM Systems Director, a free-to-own set of platform management tools. This tutorial is part of a series on VMControl resource lifecycle management. This tutorial explains the image deployment lifecycle using the VMControl Representational State Transfer (REST) application programming interfaces (APIs).
|Tutorial||29 Jan 2013|
|IBM Systems Director VMControl resource lifecycle management: part 2
IBM Systems Director is a platform management solution that is used to manage physical and virtual systems in a multisystem environment. It supports various virtualization technologies and multiple operating systems across IBM and non-IBM platforms. IBM Systems Director VMControl is an advanced manager of IBM Systems Director, a free-to-own set of platform management tools. This tutorial is part of a series on VMControl resource lifecycle management. This tutorial explains the virtual appliance lifecycle using the VMControl Representational State Transfer (REST) application programming interfaces (APIs).
|Tutorial||25 Jan 2013|
|IBM Systems Director VMControl resource lifecycle management: part 1
IBM Systems Director is a platform management solution that is used to manage physical and virtual systems in a multisystem environment. It supports various virtualization technologies and multiple operating systems across IBM and non-IBM platforms. IBM Systems Director VMControl™ is an advanced manager of IBM Systems Director, a free-to-own set of platform management tools. This tutorial is part of a series on VMControl resource lifecycle management. This tutorial explains the virtual server lifecycle using the VMControl Representational State Transfer (REST) application programming interfaces (APIs).
|Tutorial||17 Jan 2013|
|Learning PHP, Part 2: Upload files and use XML or JSON to store and display file information
This tutorial is Part 2 of a three-part "Learning PHP" series teaching you how to use PHP through building a simple workflow application. Take this tutorial if you have a basic understanding of PHP and want to learn about uploading files from the browser, sessions, or using PHP to process XML or JSON.
|Tutorial||03 Jan 2013|
|Learn Linux, 101: Create partitions and filesystems
Learn how to create partitions on a disk drive and how to format them for use on a Linux system as swap or data space. You can use the material in this article to study for the LPI 101 exam for Linux system administrator certification, or just to learn about partitions and Linux filesystems for your own use.
|Articles||04 Dec 2012|
|Learn Linux, 101: Boot managers
Learn how to choose and configure a boot manager for your Linux system. You can use the material in this article to study for the LPI 101 exam for Linux system administrator certification, or just to learn for fun.
|Articles||04 Dec 2012|
|Learn Linux, 101: A roadmap for LPIC-1
Use this roadmap to find IBM developerWorks articles that will help you learn and review basic Linux tasks. And if you're also pursuing professional certification as a Linux system administrator, these articles can help you study for the Linux Professional Institute Certification (LPIC) exam 101 and exam 102. This roadmap is organized according to the 43 objectives in the 101 and 102 exams, which you are required to pass for LPI level 1 certification.
|Articles||04 Dec 2012|
|Learn Linux, 101: Hard disk layout
Learn how to design a partition layout for disks on a Linux system. You can use the material in this article to study for the LPI 101 exam for Linux system administrator certification, or just to learn for fun.
|Articles||27 Nov 2012|
|vi intro -- the cheat sheet method
This tutorial shows how to use vi, a powerful visual editor. Using an accelerated cheat sheet method, this tutorial aims to make you a proficient vi user without requiring a huge time commitment. You will quickly learn how to move around, edit text, use insert mode, copy and paste text, and use important vim extensions like visual mode and multi-window editing.
|Tutorial||16 Nov 2012|
|Wrap GObjects in Python
Learning how to wrap GTK+ C modules for use in Python will enable you to use a C-coded GObject in Python whenever you like, whether or not you're especially proficient in C.
|Articles||15 Nov 2012|
|Managing VMs with the Virtual Machine Manager
Explore the use of virt-manager, its capabilities on modest hardware, and how to use it to manage and monitor live VM performance.
|Articles||31 Oct 2012|
|Introduction to Migration Advisor quick fixes
Learn how to fix migration problems in your application by using the Migration Advisor tool, which is part of the IBM Software Development Kit (SDK) for PowerLinux.
|Demos||30 Oct 2012|
|Virtualize the IBM DB2 pureScale Feature on Linux using Kernel-based Virtual Machine
Learn how you can improve your return on investment when you deploy the IBM DB2 pureScale Feature with Linux on IBM System x servers. Modern System x servers have an ample number of cores and amount of memory and I/O capability. By using virtualization technology, you can deploy multiple DB2 pureScale instances on a common infrastructure and achieve greater efficiency.
|Articles||25 Oct 2012|
|Introduction to the cycles per instruction analysis tool
Learn how to analyze the performance of your application using the cycles per instruction (CPI) analysis tool. The CPI tool is part of the IBM Software Development Kit (SDK) for PowerLinux.
|Demos||25 Oct 2012|
|Learning PHP, Part 1: Register for an account, upload files for approval, and view and download approved files
This tutorial is Part 1 of a three-part "Learning PHP" series teaching you how to use PHP through building a simple workflow application. This tutorial walks you through creating a basic PHP page using HTML forms and covers accessing databases.
|Tutorial||23 Oct 2012|
|Recover inaccessible instances using QEMU
Suppose something went wrong and you discover you have an inaccessible Linux instance on IBM SmartCloud Enterprise? What can you do? The authors of this article walk you through the steps to recover an inaccessible Linux instance. They show how to capture a private image, copy it to persistent storage, use QEMU to boot the captured image or mount it using kpartx, fix the problem, and then import the image back into the cloud.
|Articles||18 Oct 2012|
|Implement POSIX Semaphore APIs using System V Semaphores APIs
Need to use POSIX APIs but the development platform doesn't support them (such as z/OS)? Don't let that hold you back. Learn how you can implement POSIX Semaphore APIs using System V Semaphore APIs to bring your code to more platforms and keep it maintainable.
|Articles||16 Oct 2012|
|Explore Python, machine learning, and the NLTK library
Machine learning lies at the intersection of IT, mathematics, and natural language, and is typically used in big-data applications. This article discusses the Python programming language and its NLTK library, then applies them to a machine learning project.
|Articles||09 Oct 2012|
|Linux for Windows systems administrators
Use your existing Windows systems administration skills to ease the learning curve for Linux systems administration and broaden your skill set. This knowledge path guides you through the process from understanding the file system and files to managing accounts, running software, and monitoring and maintenance to put you on the fast track to managing servers that run on a variety of hardware architectures.
|Articles||25 Sep 2012|
|Planning a zEnterprise zBX implementation
Identify and learn seven must-know items to properly plan and implement the initial installation of the zEnterprise System ensemble configuration. Follow this knowledge path to develop a good understanding of what is required for a smooth implementation of the zEnterprise System ensemble. Relevant educational courses are identified in and after the final step.
|Knowledge paths||19 Sep 2012|
|Ensure a resilient virtual server
IBM PureFlex System comes with the hardware pre-integrated and the management stack pre-loaded for convenience, but there are a few manual steps you need to do before it can be used to host resilient virtual servers. In this article, the authors explain and show how to set up and deploy a resilient virtual server (in this article, Red Hat's KVM hypervisor is used).
|Articles||19 Sep 2012|
|Learn Linux, 101: Runlevels, shutdown, and reboot
Learn to shut down or reboot your Linux system, warn users that the system is going down, and switch to a more or less restrictive runlevel. You can use the material in this article to study for the LPI 101 exam for Linux system administrator certification, or just to learn about shutting down, rebooting, and changing runlevels.
|Articles||18 Sep 2012|
|Introducing Spring Roo, Part 7: Develop Spring MongoDB applications using Spring Roo
MongoDB is a very popular document-oriented, horizontally-scalable NoSQL datastore. With Spring Roo version 1.2, you can build Spring applications with MongoDB as data storage solutions. Investigate MongoDB and then build an enterprise Spring MongoDB application using Spring Roo.
|Articles||07 Sep 2012|
|Build custom embedded Linux distributions with the Yocto Project
The Yocto Project is an open source project formed with the goal of making embedded Linux development easier and more portable across architectures. This article introduces the project and provides a step-by-step walk through on how to get started.
|Articles||28 Aug 2012|
|Understand Representational State Transfer (REST) in Ruby
REST, or Representational State Transfer, is a distributed communication architecture that is quickly becoming the lingua franca for clouds. It's simple, yet expressive enough to represent the plethora of cloud resources and overall configuration and management. Learn how to develop a simple REST agent from the ground up in Ruby to learn its implementation and use.
|Articles||17 Aug 2012|
|Explore Linux as a scientific computing platform
Linux is a great platform for scientific computing and is heavily used by the academic community for numerous tasks. While many open source projects address specific applications, the Sage mathematical project delivers a more generic problem-solving capability. Python is the primary language for many of the highest profile scientific applications, which this article discusses.
|Articles||07 Aug 2012|
|Accelerate to Green IT - A practical guide to application migration and re-hosting
This guide has been developed based on implementation experience in moving application workloads from a distributed environment, such as AIX workload on Power or pSeries, RS 6000 hardware, Solaris workload on Sun hardware or Linux workload on x86 hardware (that is, IBM eServer to IBM System z primarily IBM System z9 or z10 models).
|Articles||16 Jul 2012|
|Make the most of large drives with GPT and Linux
Once a remote prospect, an important barrier in disk storage has become a reality: the venerable master boot record (MBR) partitioning scheme can't fully handle disks larger than 2.2TB (2TiB). With disks as large as 3TB readily available and with much larger RAID arrays common, alternatives to the MBR partitioning scheme have become important to understand. The heir apparent is the GUID Partition Table (GPT). Learn how to make sure your Linux system is fully prepared for the future of disk storage.
|Articles||03 Jul 2012|
|Secure programming with the OpenSSL API, Part 1: Overview of the API
Learning how to use the API for OpenSSL -- the best-known open library for secure communication -- can be intimidating, because the documentation is incomplete. Fill in the gaps, and tame the API, with the tips in this article. After setting up a basic connection, see how to use OpenSSL's BIO library to set up both a secured and unsecured connection. And learn a bit about error detection as well.
|Articles||28 Jun 2012|
|Linux for Windows systems administrators: Administer Linux with GNOME desktop tools
Working with Linux doesn't mean your work is restricted to command-line tools. True, most experienced Linux administrators use command-line tools for convenience and more efficient administration. However, the GNOME project provides some excellent tools for managing a Linux server using a graphical user interface (GUI). Using your Microsoft Windows background experience, you might find that these tools make the transition less dramatic.
|Articles||26 Jun 2012|
|Create a working compiler with the LLVM framework, Part 1
The LLVM compiler infrastructure provides a powerful way to optimize your applications regardless of the programming language you use. Learn the basics of the LLVM in this first article of a two-part series. Building a custom compiler just got easier!
|Articles||19 Jun 2012|
|Create a working compiler with the LLVM framework, Part 2
The LLVM compiler infrastructure provides a powerful way to optimize your applications regardless of the programming language you use. Learn to instrument code in LLVM, using the clang API to preprocess C/C+ code in this second article of a two-part series.
|Articles||19 Jun 2012|
|Introducing the 3.3 and 3.4 Linux kernels
In March 2012, version 3.3 of the Linux kernel was released (followed in by version 3.4 in May). In addition to a plethora of small features and bug fixes, several important changes have arrived with these releases, including the merging of the Google Android project; merging of the Open vSwitch; several networking improvements (including the teaming network device); and a variety of file system, memory management, and virtualization updates. Explore many of the important changes in versions 3.3 and 3.4, and have a peek at what's ahead in 3.5.
|Articles||19 Jun 2012|
|Evaluate performance for Linux on POWER
Learn to evaluate Linux on POWER performance issues that focus on compiled language (such as C or C++) environments. This article explains the POWER7 CPI model and demonstrates the use of commonly available Linux tools to show potential CPU stalls, pipeline hazards, and performance issues. Analyze and optimize an algorithm for POWER7 in the final section.
|Articles||12 Jun 2012|
|Porting applications to Linux for System z
Server consolidation based on Linux for IBM System z offers advantages, but moving existing applications requires some specialized knowledge. In this article, get general advice on how to organize your porting project, including technical details on mainframe virtualization, byte-ordering, and address calculation specific to System z. This article also covers how development tools (compiler, linker, debugger) are supported on System z, and introduces IBM's free-of-charge Migration Kit for Solaris OS to Linux.
|Articles||08 Jun 2012|
|Track KVM guests with libvirt and the Linux audit subsystem
Libvirt is an important tool for managing virtualized environments on Linux hosts. An audit trail of events that occur on the host during libvirt's execution is often necessary for monitoring, compliance, forensics, and other purposes. This article describes how to use the Linux audit subsystem on the host to track operations performed by libvirt and how to correlate the events with other host events to provide a consistent and comprehensive view of changes performed through libvirt.
|Articles||05 Jun 2012|
|Practice: Process logs with Apache Hadoop
Logs are an essential part of any computing system, supporting capabilities from audits to error management. As logs grow and the number of log sources increases (such as in cloud environments), a scalable system is necessary to efficiently process logs. This practice session explores processing logs with Apache Hadoop from a typical Linux system.
|Articles||30 May 2012|
|Secure Linux: Part 1. SELinux – history of its development, architecture
and operating principles
Learn about the basic milestones in the development, architecture, and operating principles of Security-Enhanced Linux, the powerful remix of Linux providing mandatory access control. This article was specially selected for translation by developerWorks Russia as an example of developerWorks world-wide offerings.
|Articles||30 May 2012|
|Optimizing resource management in supercomputers with SLURM
The arms race of supercomputers is fascinating to watch as their evolving architectures squeeze out more and more performance. One interesting fact about supercomputers is that they all run a version of Linux. To yield the greatest amount of power from an architecture, the SLURM open source job scheduler (used by the Chinese Tianhe-IA supercomputer, and the upcoming IBM Sequoia supercomputer) optimizes resource allocation and monitoring. Learn about SLURM and its approach to parallelizing workloads in clusters.
|Articles||22 May 2012|
|LPI exam prep: Network client management
In this tutorial, the fifth in a series of seven tutorials covering intermediate network administration on Linux, David Mertz continues preparing you to take the Linux Professional Institute Intermediate Level Administration (LPIC-2) Exam 202. By following this tutorial, you will examine several protocols' centralized configuration of network settings on clients within a network. DHCP is widely used to establish basic handshaking to clients machines such as assigning IP addresses. At a higher level, NIS and (more often) LDAP are used for arbitrary shared information among machines on a network. This tutorial also discusses PAM, which is a flexible, networked, user authentication system.
|Tutorial||17 May 2012|
|Anatomy of Security-Enhanced Linux (SELinux)
Linux has been described as one of the most secure operating systems available, but the National Security Agency (NSA) has taken Linux to the next level with the introduction of Security-Enhanced Linux (SELinux). SELinux takes the existing GNU/Linux operating system and extends it with kernel and user-space modifications to make it bullet-proof. If you're running a 2.6 kernel today, you might be surprised to know that you're using SELinux right now! This article explores the ideas behind SELinux and how it's implemented.
|Articles||17 May 2012|
|Linux for Windows systems administrators: Understand how to execute applications that run on Linux
Using applications is the main purpose of a Linux server. Whether your newly installed application runs from a desktop or the command line, this article helps you use your Microsoft Windows experience to quickly understand how to run applications on Linux.
|Articles||17 May 2012|
|Use of IPSEC in Linux when configuring network-to-network and point-to-point VPN connections
This article takes a detailed look at the design principles, the basis for deploying VPN, and the IPSEC protocol concept, providing a description of the general features of IPSEC and of the mechanisms required for its implementation. This article was specially selected for translation by developerWorks Russia as an example of developerWorks world-wide offerings.
|Articles||15 May 2012|
|Add Linux power to wireless routers with advanced tips and tricks for DD-WRT
DD-WRT brings all the power of the Linux networking stack to inexpensive wireless routers, turning a consumer router into a mighty networking powerhouse. Learn how to install and secure DD-WRT, and learn about the powerful, flexible command line behind the GUI.
|Articles||08 May 2012|
|Protect your data at the speed of light with gKrypt, Part 1
Meet the gKrypt engine, the world's first package to employ general purpose graphics units (GPGPUs) for data encryption, which is an important tool for information security. It uses an Advanced Encryption Standard (AES) based 256-bit block cipher to provide robust security. In this Part 1 of a two-part series, explore the AES, the GPU port of the Rijndael algorithm for Linux, the parallelizing of the AES algorithm, and the use of the gKrypt Engine supporting CUDA for NVIDIA-based GPUs.
|Articles||01 May 2012|
|Meet six misunderstood Ruby features
Suppose you are a C++ developer and you need to do some prototyping quickly in Ruby. When you pick up a Ruby reference book like the Pickaxe or browse the Ruby site, you see familiar constructs like class declaration, support for threads, and exception handling. Just when you thought you knew how Ruby works, you realize that concurrency in your Ruby code is not behaving like Boost threads, catch and throw are not what they seem, and others have used something called self all over the place in their Ruby script. Welcome to Ruby!
|Articles||01 May 2012|
|Protect your data at the speed of light with gKrypt, Part 2
Meet the gKrypt engine, the world's first package to employ general purpose graphics units (GPGPUs) for data encryption. It uses an Advanced Encryption Standard (AES) based 256-bit block cipher. This is the second article in a two-part series on AES encryption and the gKrypt engine. Part 1 introduced gKrypt and explained the AES algorithm in detail, its parallel breakdown and how to map it on a massive GPU architecture using the Compute Unified Device Architecture (CUDA). Part 2 looks at how AES is implemented on CUDA.
|Articles||01 May 2012|
|Enable multiuser logins with VNC
Virtual Network Computing (VNC) is a popular tool for providing remote access to computers. The usual VNC configuration is optimized for single-user workstations, and logging in to the VNC port directly accesses a single user's desktop. This configuration is awkward on multiuser computers, however. Fortunately, you have an alternative. By linking VNC to a Linux computer's normal X Display Manager Control Protocol (XDMCP) server, accessing the VNC port enables users to provide their user names and passwords, thereby enabling a single VNC server instance to handle multiple user logins.
|Articles||24 Apr 2012|
|Implement strong WiFi encryption the easy way with hostapd
Keep wireless security simple. hostapd, the Host Access Point daemon provides solid WiFi encryption that meets enterprise standards without all the overhead of running FreeRADIUS. Learn more about this tool and how to incorporate it into your environment.
|Articles||10 Apr 2012|
PubSubHubbub is an open protocol of web hooks for notifications of updates to news feeds in a publish/subscribe framework. It is defined as a set of HTTP server-to-server interactions integrated into Atom and RSS extensions. Despite the odd name, PubSubHubbub is fairly straightforward to use for designing applications with a lot of information updates. Learn about the standard and open-source implementations and support software for PubSubHubbub.
|Articles||03 Apr 2012|
|LPI exam prep: Mail and news
This is the second of seven tutorials covering intermediate network administration on Linux. In this tutorial, David Mertz discusses how to use Linux as a mail server and as a news server. Overall, e-mail is probably the main use of the Internet, and Linux is perhaps the best platform for running e-mail services on. This tutorial covers mail transport, local mail filtering, and mailing list maintenance software. It also briefly discusses server software for the NNTP protocol.
|Tutorial||29 Mar 2012|
|Learn Linux, 101: RPM and YUM package management
Learn how to install, upgrade and manage packages on your Linux system. This article focuses on the Red Hat Package Manager (RPM) developed by Red Hat, as well as the Yellowdog Updater Modified (YUM) originally developed to manage Red Hat Linux systems at Duke University's Physics department. You can use the material in this article to study for the LPI 101 exam for Linux system administrator certification, or just to explore the best ways to add new software and keep your system current. [Typographical errors noted by alert readers (see Comments at the end of this article) have been corrected, thanks! --Ed.]
|Articles||19 Mar 2012|
|Look at Linux, the operating system and universal platform
Linux is everywhere. If you peer into the smallest smart phone, to the virtual backbone of the Internet, or the largest and most powerful supercomputer, you'll find Linux. That's no simple feat given the range of capabilities expected from these platforms. Discover the omnipresence of Linux and how it supports devices large and small as well as everything in between.
|Articles||13 Mar 2012|
|Create solutions on IBM SmartCloud Enterprise: Best practices and tools
Models, tools, and concepts start this series of articles that describes the use of software bundles, image management, and other tools on IBM SmartCloud Enterprise to solve practical problems in enterprise IT management. This article presents an overview of software bundle and image management concepts, explains the resource model, compares this platform to other software package management platforms, discusses use cases, and surveys the tools available. The concepts are illustrated with the use of an example energy-saving calculator application.
|Articles||09 Mar 2012|
|Process your data with Apache Pig
Apache Pig is a high-level procedural language for querying large semi-structured data sets using Hadoop and the MapReduce Platform. Pig simplifies the use of Hadoop by allowing SQL-like queries to a distributed dataset. Explore the language behind Pig and discover its use in a simple Hadoop cluster.
|Articles||28 Feb 2012|
|Introduction to C/C++ development features of the IBM SDK for PowerLinux
This demo shows some of the C and C++ development features of the IBM Software Development Kit (SDK) for PowerLinux.
|Demos||24 Feb 2012|
|Using Autotools with the IBM SDK for PowerLinux
This demo shows you how to work with Autotools projects within the IBM SDK for PowerLinux
|Demos||24 Feb 2012|
|Repair cloud virtual machine cloning errors
External data provisioning requirements such as network configurations like IP addresses can cause problems when cloning a virtual machine to use in a new environment. If the external data is not available during the process, the reconfiguration of the VM will likely be incomplete. The authors offer a way to handle this problem, even without much knowledge of the application or without a form of activation scripting to help. Runtime Image Activation (RIA) is a prototype command-line interface that lets you orchestrate networking techniques to make sure your cloned VMs are appropriately configured.
|Articles||20 Feb 2012|
|Import a Linux OS to SmartCloud Enterprise
Based on his own experiences successfully importing versions of CentOS and Ubuntu to IBM SmartCloud Enterprise, the author explains how to prepare your image and metadata, what kind of tools are required, how to set up your workbench, and delivers some tips for troubleshooting the process.
|Articles||20 Feb 2012|
|Boost IBM InfoSphere Streams performance with Linux channel bonding
Have you ever wondered if Linux channel bonding would allow you to get faster throughput using IBM InfoSphere Streams? We have answered that question when running InfoSphere Streams release 184.108.40.206 on Red Hat Enterprise Linux release 5.5. In this article, we describe what channel bonding is at a high level, how we set up our test environment, and the results we observed. In our experiments, channel bonding increased bandwidth by as much as 68 percent.
|Articles||16 Feb 2012|
|Data analysis and performance with Spark
Spark is an interesting alternative to Hadoop, with a focus on in-memory data processing. This practice session explores multithread and multinode performance with Scala, Spark, and its tunable parameters.
|Articles||14 Feb 2012|
|Pure speed with mod_pagespeed
mod_pagespeed is a module from Google for Apache HTTP Servers that can improve the page load times of your website. It programmatically and automatically incorporates all the best practices for a speedy website into your site, and requires only minimal configuration. With mod_pagespeed, Apache web hosters can improve website speed quickly and easily.
|Articles||31 Jan 2012|
|Linux for Windows systems administrators: Managing and monitoring the extended file system
Windows and Linux use different file system architectures. Fortunately, your Windows experience can put you on the fast track to being comfortable managing and monitoring the Linux extended file systems. This article helps you learn your way around the extended disk file system family on Linux.
|Articles||17 Jan 2012|
|Scripting KVM with Python, Part 2: Add a GUI to manage KVM with libvirt and Python
Further explore how to use Python to create scripts for managing virtual machines using KVM. Learn how to add a GUI to expand on the simple status and display tool.
|Articles||17 Jan 2012|
|Firewall uptime and security with iptables
Iptables is the standard Linux firewall application. It is easy to configure and maintain while powerful enough to provide the control expected from a high-end appliance. Learn how to get started with iptables, recover from common issues, and simulate a small-office usage scenario.
|Articles||04 Jan 2012|
|Learn Linux, 302 (Mixed environments): Performance tuning
In preparation for taking the Linux Professional Institute Certification exam LPI-302 for systems administrators, learn how to measure Samba performance and make Samba work faster.
|Articles||20 Dec 2011|
|Elevate cloud security with privilege delegation
In this article, the author discusses the needs that drive migration of data centers into the cloud, details the role of virtualization in both public and private cloud infrastructures, and outlines the security and compliance implications of cloud computing in order to provide insight into the protection of sensitive data in the cloud through "administrative access" and "privileged delegation."
|Articles||14 Dec 2011|
|Learn Linux, 302 (Mixed environments): A roadmap for LPI-302
Use this roadmap to find IBM developerWorks articles that help you learn and review the fundamentals of supporting Linux in a mixed UNIX/Microsoft environment. If you are also pursuing professional certification as a Linux systems administrator, these articles can help you study for the Linux Professional Institute Certification exam LPI-302. This roadmap is organized according to the 21 objectives in the LPI-302 exam, which is required to get the LPIC-3 specialization in mixed environments.
|Articles||13 Dec 2011|
|Learn Linux, 302 (Mixed environments): Samba security
In preparation for taking the Linux Professional Institute Certification exam LPI-302 for systems administrators, learn how to secure Samba and troubleshoot problems related to security.
|Articles||13 Dec 2011|
|Evolution of shells in Linux
Pointing and clicking is fine for most day-to-day computing tasks, but to really take advantage of the strengths of Linux over other environments, you eventually need to crack the shell and enter the command line. Lots of command shells are available, from Bash and Korn to C shell and various exotic and strange shells. Learn which shell is right for you. [Note: Minor corrections were made to Listings 2 and 3.]
|Articles||09 Dec 2011|
|Learn Linux, 302 (Mixed environments): Integration with Active Directory
Since the release of Windows 2000, Microsoft has offered Active Directory as its directory service, and later versions have renamed it Active Directory Domain Services (AD DS). AD DS leverages the popular LDAP for resource management, Kerberos for authentication, and tight integration with DNS for name resolution. If you currently use AD DS, integrating a Linux server can help centralize identity management and maintenance for Linux printing and file services. However, doing so can be challenging. Fortunately, Samba provides a solution for Linux integration with AD DS that requires no modification to the directory service. [Note: We corrected the Listing 4 caption and clarified the section on "Using the net command" per reader feedback.]
|Articles||08 Dec 2011|
|Scripting KVM with Python, Part 1: libvirt
This two-part series explores how to use Python to create scripts for managing virtual machines using Kernel-based Virtual Machine (KVM). In this installment, learn the basics of using libvirt and the Python bindings to build a few simple status and display tools.
|Articles||06 Dec 2011|
|Learn Linux, 302 (Mixed environments): Linux file system and share/service permissions
In preparation for taking the Linux Professional Institute Certification exam LPI-302 for systems administrators, learn how Samba interacts with the Linux file system and how to manage permissions.
|Articles||06 Dec 2011|
|Scheduling in Hadoop
Get to know Hadoop scheduling, and explore two of the algorithms available today:fair scheduling and capacity scheduling. Also, learn how these algorithms are tuned and in what scenarios they're relevant.
|Articles||06 Dec 2011|
|Learn Linux, 302 (Mixed environments): Working with Windows clients
While UNIX and Linux computers can be clients to a Samba server, most clients of most Samba servers run Windows. Therefore, you should know how to use the Windows features that enable you to connect to a Samba server. For example, using certain Samba commands on a Linux computer can help you debug problems should they occur.
|Articles||29 Nov 2011|
|Easy and beautiful documentation with Sphinx
Create maintainable, style-driven documents that can be automatically distributed in different formats using Sphinx. Discover how Sphinx abstracts the tedious parts and offers automatic functions to solve common problems like title indexing and special code highlighting.
|Articles||29 Nov 2011|
|Basic tasks for new Linux users
If you're a Windows user, you may find your new Linux system to be a bit different from what you're used to. One of your first tasks will probably be installing additional software, including some of IBM's extensive software for Linux. In many cases, installing software on a Linux system requires you to log in, become the super user (or root) for some tasks, open a terminal or shell window, and mount a CD-ROM, DVD, or USB drive. This article guides you through these basic first-time user tasks and more.
|Tutorial||19 Nov 2011|
|Learn Linux, 302 (Mixed environments): Winbind
If your network includes a domain controller (either a Windows computer or a Samba server), you can use its user database instead of or in addition to maintaining local login users in a Linux computer's local account database. Doing so requires using a set of tools known as Winbind. This toolset can be handy even for Linux computers that don't run Samba to share files or printers; users with Windows domain accounts can log in at the console or use SSH to access Linux-only features, use POP or IMAP mail servers with Windows domain authentication, and so on.
|Articles||15 Nov 2011|
|Learn Linux, 302 (Mixed environments): NetBIOS and WINS
Naming is unusual in SMB/CIFS networks. Although modern clients can use Internet domain names to refer to each other, older clients relied on a Microsoft-specific system known as the Windows Internet Name Service (WINS) server, or the NetBIOS Name Server (NBNS); the two terms are synonymous. Configuring Samba properly for name resolution is therefore important. So is configuring browsing, which is the mechanism by which servers learn what shares are available on specific servers.
|Articles||01 Nov 2011|
|Learn Linux, 302 (Mixed environments): CIFS integration
In addition to, or instead of, functioning as a server on a Windows network, a Linux computer can function as a client. You can use an ftp-like program to transfer files and modify a server, or you can mount a share from a Samba or Windows Server machine on your Linux computer, giving normal programs the ability to access files directly on the server. When doing so, though, keep in mind the characteristics of the original SMB protocol and its newer CIFS variant, particularly when accessing a Windows Server machine: You may not have access to all the file system features that a Linux computer supports.
|Articles||25 Oct 2011|
|Learn Linux, 302 (Mixed environments): Managing user accounts and groups
If you manage user and group accounts, you may find that these accounts don't always work seamlessly for users in mixed environments--a common source of frustration for both users and systems administrators. Fortunately, the Samba suite provides tools to help you manage the process. In this article, learn how to manage user and group accounts in your mixed environment.
|Articles||18 Oct 2011|