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  • How can I see logs in a server after a kernel panic hang ?

    - by Low Kian Seong
    I am running a production gentoo Linux machine, and recently there was a situation where the server hung in my co-located premises and when I got there I noticed that the server was hung on what appeared to be a kernel panic hang. I rebooted the machine with a hard reboot and was disappointed to find out that I could not find a shred of evidence anywhere on why the machine hung. Is it true that when I do a hard reboot the messages itself will get lost or is there a setting I can do somewhere say in syslog-ng or maybe in sysctl to at least preserve the error log so that I can prevent such mishaps from happening in the future ? I am running a 2.6.x kernel by the way. Thanks in advance.

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  • How Exactly Is One Linux OS “Based On” Another Linux OS?

    - by Jason Fitzpatrick
    When reviewing different flavors of Linux, you’ll frequently come across phrases like “Ubuntu is based on Debian” but what exactly does that mean? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites. The Question SuperUser reader PLPiper is trying to get a handle on how Linux variants work: I’ve been looking through quite a number of Linux distros recently to get an idea of what’s around, and one phrase that keeps coming up is that “[this OS] is based on [another OS]“. For example: Fedora is based on Red Hat Ubuntu is based on Debian Linux Mint is based on Ubuntu For someone coming from a Mac environment I understand how “OS X is based on Darwin”, however when I look at Linux Distros, I find myself asking “Aren’t they all based on Linux..?” In this context, what exactly does it mean for one Linux OS to be based on another Linux OS? So, what exactly does it mean when we talk about one version of Linux being based off another version? The Answer SuperUser contributor kostix offers a solid overview of the whole system: Linux is a kernel — a (complex) piece of software which works with the hardware and exports a certain Application Programming Interface (API), and binary conventions on how to precisely use it (Application Binary Interface, ABI) available to the “user-space” applications. Debian, RedHat and others are operating systems — complete software environments which consist of the kernel and a set of user-space programs which make the computer useful as they perform sensible tasks (sending/receiving mail, allowing you to browse the Internet, driving a robot etc). Now each such OS, while providing mostly the same software (there are not so many free mail server programs or Internet browsers or desktop environments, for example) differ in approaches to do this and also in their stated goals and release cycles. Quite typically these OSes are called “distributions”. This is, IMO, a somewhat wrong term stemming from the fact you’re technically able to build all the required software by hand and install it on a target machine, so these OSes distribute the packaged software so you either don’t need to build it (Debian, RedHat) or they facilitate such building (Gentoo). They also usually provide an installer which helps to install the OS onto a target machine. Making and supporting an OS is a very complicated task requiring a complex and intricate infrastructure (upload queues, build servers, a bug tracker, and archive servers, mailing list software etc etc etc) and staff. This obviously raises a high barrier for creating a new, from-scratch OS. For instance, Debian provides ca. 37k packages for some five hardware architectures — go figure how much work is put into supporting this stuff. Still, if someone thinks they need to create a new OS for whatever reason, it may be a good idea to use an existing foundation to build on. And this is exactly where OSes based on other OSes come into existence. For instance, Ubuntu builds upon Debian by just importing most packages from it and repackaging only a small subset of them, plus packaging their own, providing their own artwork, default settings, documentation etc. Note that there are variations to this “based on” thing. For instance, Debian fosters the creation of “pure blends” of itself: distributions which use Debian rather directly, and just add a bunch of packages and other stuff only useful for rather small groups of users such as those working in education or medicine or music industry etc. Another twist is that not all these OSes are based on Linux. For instance, Debian also provide FreeBSD and Hurd kernels. They have quite tiny user groups but anyway. Have something to add to the explanation? Sound off in the the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.     

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  • Lightweight Linux distro that includes developer tools? (or, the most BSD-like Linux)

    - by RevAaron
    I cut my teeth on Minix and Slackware 1.1, but I've been in the OS X Wilderness for the last few years. I'm trying to standardize on a Linux distribution for personal and work-related use on less powerful laptops and under virtualization. So far, NetBSD and OpenBSD are the best fit for my purposes- but after plenty of frustration I've come to the conclusion that I need to stick with Linux to get the hardware and software support that comes with it. What I like about NetBSD/OpenBSD that I'd like to keep: X, but no default KDE, GNOME or XFCE! A sensible /etc and dot file setup- startx calls xinit, xinit looks for ~/.xinitrc; nothing more complicated than that is needed. Command line tools and file-based configuration: I shouldn't need a GUI to connect to a WAP. Decent selection of binary packages; building from source is OK, but nothing source-only like Gentoo. pkg_add (BSD) and apt-get both have treated me well in the past. Modest RAM and HDD requirements: boot + X + awesome+ two xterms takes up 80 MB on OpenBSD and 240 MB on Debian 5 and Crunchbang In my experience, most "lightweight" and Live CDs focus on a nice desktop environment crammed into a CD or USB stick; once you add build-essentials you end up with something just about as bloated as Ubuntu or Debian full install. Crunchbang is a great example. Thanks in advance for all suggestions!

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  • Which Linux distribution for vehicle LCD instrument panel

    - by Brent
    I will be designing an instrument panel for a vehicle to display the common gauges that you would find in a car - (speedometer, rpm, fuel level, oil pressure, etc.). We have selected a 7" LCD and are in the process of narrowing down the hardware (This will use an ARM processor). The idea is to read these values off of the CAN Bus and update the UI with those values. This needs to have a fairly quick boot time, 5-10 seconds would be acceptable from the time the ignigtion is turned on to the time the UI is running. I have been doing a lot of research on which linux distribution to use, but I wanted to ask the question here to get the community's suggestions. I have been a .NET programmer for years, so linux is a new world to me. Here is what I have found so far... Tizen is geared for In-Vehicle Infotainment (IVI) (plus some others). However, this project is not an IVI, and I do not need the phone dialer, navigation, etc. Meego is dead, and Tizen seems to be the replacement Angstrom, Debian... would either of these be useful? I am not tied to a particular programming language or IDE. Any help and direction is appreciated!

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  • OCFS2 Now Certified for E-Business Suite Release 12 Application Tiers

    - by sergio.leunissen
    Steven Chan writes that OCFS2 is now certified for use as a clustered filesystem for sharing files between all of your E-Business Suite application tier servers.  OCFS2 (Oracle Cluster File System 2) is a free, open source, general-purpose, extent-based clustered file system which Oracle developed and contributed to the Linux community.  It was accepted into Linux kernel 2.6.16.OCFS2 is included in Oracle Enterprise Linux (OEL) and supported under Unbreakable Linux support.

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  • HTG Explains: Why Linux Doesn’t Need Defragmenting

    - by Chris Hoffman
    If you’re a Linux user, you’ve probably heard that you don’t need to defragment your Linux file systems. You’ll also notice that Linux distributions don’t come with disk-defragmenting utilities. But why is that? To understand why Linux file systems don’t need defragmenting in normal use – and Windows ones do – you’ll need to understand why fragmentation occurs and how Linux and Windows file systems work differently from each other. HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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  • Linux distributions comparison

    - by Daniel Cukier
    Does any good comparison exist (like a table of present features) between the many Linux distributions? What are the features and advantages on each distribution? (Ubuntu, Fedora, CentOS, etc.) What choice is better for what kind of user profile?

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  • Arch linux, openbox Monaco font problem

    - by z33m
    Im trying to setup a minimal desktop with openbox window manager on Arch linux. I noticed these weird font rendering issues with Monaco font. Below font size 13, alternate font sizes are rendered in an aliased, ugly manner. The same Arch installation has no problem rendering Monaco font when running under xfce. some of the characters even look completely different. I tried tweaking my .fonts.conf, but no luck.

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  • Dell Studio 15 Broadcom wireless drivers not working in Linux Mint

    - by dcd0687
    I installed Linux Mint 12 on my Dell Studio 15 and everything worked perfectly up until I tried updating the STA Driver for the Broadcom (BCM4312) wireless controller. I've tried these bash commands in order and I still don't have wireless. sudo apt-get install b43-fwcutter sudo apt-get install b43-fwcutter firmware-b43-installer I've also tried uninstalling everything with synaptic package manager including broadcom-sta-common and broadcom-sta-source, then restarting and running the above commands which didn't work either. What's the best way to do this on a Dell Studio 15?

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  • Errors from ALSA during Arch Linux boot

    - by Macha
    Everytime I boot my Linux system, I get these errors while ALSA boots. Despite these, the sound still works, so these are more of an annoyance than anything. How do I stop these occuring? Unknown hardware: "HDA-Intel" "IDT 92HD73C1X5" "HDA:111d7675,10280256,00100202" "0x1028" "0x0256" Hardware is initialized using a guess method /usr/sbin/alsactl: set_control:1255: failed to obtain info for control #6 (No such file or directory) /usr/sbin/alsactl: set_control:1255: failed to obtain info for control #7 (No such file or directory)

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  • How to boot linux direct to application on console with no login

    - by amanda
    I have a need to start an application on bootup on the linux console and I do not have a need for any type of login or security. I do not need any ALT-F1,F2,etc virtual consoles but I would like to allow SSH access via the network port for debugging, loading, etc. The application is a SDL graphics program running with fbcon as the SDL_VIDEODRIVER if that matters. I'm currently using Fedora 10 and 12 but any distro that supports SDL using the fbcon framebuffer would be acceptable.

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  • Arch linux selecting packages

    - by allenskd
    Hello, I'm currently having problems with my arch linux installation, forgot to select a few packages but in the guide they never mention which key do I need to press to select/deselect the packages in the installation screen. I used to select them but it's been a long time, I don't remember much anymore =/ Or, if there is a way to make pacman recognize the cd as a container of packages that'd be great.

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  • few question about linux [closed]

    - by oneat
    Can I execute assembly files with all privileges (using ports)? Does the newest DSL (damn small Linux) works with winXP. (makes bootloader for it) And does it support downloading applications automatically ?

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  • Friday Spotlight: The Value of Oracle Linux

    - by Chris Kawalek
    Happy Friday! Our spotlight this week is on a brand new white paper, chock full of fantastic information about Oracle Linux. From the intro to Oracle Linux - Maximize Value, Minimize Cost: "This paper describes the savings and efficiencies that an IT department can realize by choosing Oracle Linux as their enterprise standard. It highlights sample deployments and explains how deploying Oracle Linux can reduce operational costs and result in less downtime, improved productivity, and greater opportunities for revenue generation.?" The paper explains exactly how Oracle Linux can reduce costs, and goes into some of the features of Oracle Linux that can make it more valuable for your organization. Read the paper now. Have a great week! -Chris 

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  • What is a dedicated Linux box used for?

    - by DanLeaningphp
    So this is probably a very basic and obvious question for most people, but my google-foo is failing me and it just seems something is going over my head. I've heard numerous people refer to having a 'dedicated linux box' as a central part of a developer's setup. I have been doing web-dev programming for about a year and understand the benefits of programming on a Unix/Linux system. But I seem to be missing what role a 'dedicated linux box' plays in the development process. I would assume that it is used as a server of some sort, but I am yet to run across any needs to have a computer dedicated to running a linux server. Am I just being nieve and mistaking the commonality of programmers preferring to work in linux for a tool used by developers? What do most developers use their 'dedicated linux box' for?

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  • (Arch)Linux board with dual ethernet

    - by tekknolagi
    I am looking for a Linux board with the following requirements: 2 ethernet ports (helpful, but only 1 required) 2 USB ports SDXC support (for SD/MicroSD) WiFi (25 concurrent users ideally) HDMI or micro HDMI out I don't know of a good way to find boards. I went through and catalogued a bunch in a spreadsheet, though: https://docs.google.com/spreadsheets/d/1ZyWvg1u5jAeCq4ghpQv3fukl78nYO64utfQgzTP1r7w/edit?usp=sharing

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  • The August '14 Oracle Linux Newsletter is Now Available

    - by Chris Kawalek
    The August 2014 edition of the Oracle Linux Newsletter is now available! Chock full of fantastic information, it's your one-stop-shop for catching up on all things Oracle Linux. In this edition: Oracle Linux 7 Now Available Oracle Linux and Oracle Virtualization at Oracle OpenWorld 2014 Technology Preview of OpenStack Icehouse with Oracle Linux and Oracle VM Now Available Using Ksplice as a Diagnostic Tool with Oracle Support Hands-on Lab: How to Migrate from VMware and Red Hat to Oracle Linux and Oracle VM Emirates Nuclear Energy Corporation Boosts Performance—Is Set to Cut Technology Ownership Costs by US$500,000 in Five Years And much more! You can read the latest edition online right now or sign up to get it automatically delivered to your inbox. 

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  • linux/unix filesystem permissions hack/feature

    - by selden
    Can linux or other unix create a file that no user, including root, can modify unless they have the secret key? By "have the secret key" I mean they are using some crypto scheme. Here's a scenario if you aren't already downvoting: Bob encrypts something about file /foo (maybe inode?) using secret key K Alice tries "sudo rm /foo" and gets permission denied, so she decrypts something about file /foo using secret key K and then "sudo rm /foo" succeeds.

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  • Chrome browser full Kiosk mode in Linux (Puppy Linux)

    - by Brandon Ellis
    Let me just say thanks in advance. I am having issues getting google-chrome browser into full KIOSK MODE with no browser bar on a linux platform Looking through the google forums I have found numerous postings on how to get Chrome to show full kiosk mode BUT tried to execute with --kiosk but doesnt seem to get the job done. I dont know if this is platform specific or not, but any useful information would help. I know F11 will display the browser in full kiosk mode, with no browser bar BUT is there a way to do this with a linux script and no need for a monkey pressing F11??

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  • Run one virtual machine on a Linux server + standard Linux functions

    - by fistameeny
    Hi, I am looking for a method to setup a Linux server (running Ubuntu Server) that uses Samba for file sharing, as well as hosting a Windows virtual machine (in this case, Windows Small Business Server 2003, which in turn hosts SQL Server Express - Exchange won't be used on this). I would like to have the Linux server serving the files over Samba, and hosting the Virtual Machine. This obviously rules ESXi out as it couldn't do Samba at the same time. What would be the next best solution to give reasonable speed? Vmware Server 2.0, VirtualBox, Xen? There will be 10-15 users accessing the Samba shares and the SQL Express virtual machine. Matt

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  • Which Linux is the most efficient?

    - by quandary
    Simple question: There is a gazillion Linux distributions out there. Which one (distribution/incl. window manager) makes (technically) the most efficient use of my (aging) computer ? I have appx. 1 GB RAM and a 1.6 GHz processor, 120 GB hd. I develop applications (C++/.NET/mono/ASP/PostGre SQL/). Usually, I prefer distros with apt-get. Anybody knows which one takes the most care of my limited RAM, and wich one is the fastest/slimmest of them all, that has a decent repo and is damn fast)

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