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• Upgrade a legacy, expired RHEL 3.4.6 server to modern Centos/Scientific Linux

  - by Gabriel Tasiopoulos

  I have a machine running a legacy J2EE app. The code is not Maven-ized and it works with pretty old Java and Postgres versions. I have converted it to a VM in ESXI and I'd like to try to upgrade it to a modern, binary-compatible version of RHEL (Centos or Scientific LInux) and see if things would still work. Where should I start? Am I being too optimistic with this one? It's more of an experiment and I'm not doing it on a production machine. But given the OS is pretty old I am looking for a way to do this eventually. Many thanks

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• How to tell if linux disk IO is causing excessive (> 1 second) application stalls

  - by noahz

  I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for several seconds at a time. I suspect that something related to ext3 vsfs (Veritas Filesystem) functionality (and/or how it interacts with the OS) is the culprit. What steps can I take to confirm or refute this theory? I am aware of iostat and /proc/diskstats as starting points. Revised title to de-emphasize journaling and emphasize "stalls" I have done some googling and found at least one article that seems to describe behavior like I am observing: Solving the ext3 latency problem Additional Information Red Hat Enterprise Linux Server release 5.3 (Tikanga) Kernel: 2.6.18-194.32.1.el5 Primary application disk is fiber-channel SAN: lspci | grep -i fibre 14:00.0 Fibre Channel: Emulex Corporation Saturn-X: LightPulse Fibre Channel Host Adapter (rev 03) Mount info: type vxfs (rw,tmplog,largefiles,mincache=tmpcache,ioerror=mwdisable) 0 0 cat /sys/block/VxVM123456/queue/scheduler noop anticipatory [deadline] cfq

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• LInux (Ubuntu Karmic) equivalent to Pawsense

  - by LRE

  I now work from a home office - much to the delight of my cats. One in particular likes to come for a hug several times a day. That in itself is fine but he tends to sit on my laptop keyboard whilst I'm working on my desktop and vice-versa. Also he'll walk across any keyboard I'm actually using at the time. I've found Pawsense and would like to know if anyone can suggest a Linux equivalent (or some incantations to achieve the same). Training him out of sitting on the keyboard is likely to prove fruitless (a suggested here). He's far more pig-headed than I am. This conversation discusses some utilities like xlock et al but I'd prefer if possible to have something more along the lines of Pawsense that doesn't lock the keyboard but "simply" intercepts cat-like typing. Thanks

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• Resilient Linux Mail Server Setup

  - by Coops

  How would people design a resilient mail server setup with Linux? On an application level what the system needs to provide is both an incoming and outgoing mail service (i.e. SMTP & IMAP), along with filtering and archive storage (the archive part isn't critical yet, so we'll look at this later probably). What is required on top of this is a resilient system, i.e. one which will handle individual server failures without interrupting service. As such I would term this a High Availability mail system. This is in contrast to a High Performance mail setup, as in our case the volume of mail being handled isn't the important factor, it's simply that it stays online. Having not approached this problem before, the first thing I thought of was a clustered file system (gfs/gluster/etc), combined with heartbeat to failover a floating IP to another box in the case of a server failure. Combined with postfix & dovecot does this sound feasible to people?

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• How do you pronounce Linux?

  - by Xerxes

  I'm tired of the old fart at work who keeps coming upto my desk and telling me all about his "years of experience in working with Unix and Lye-nix". I couldn't vent it out at him because that would be wrong, so I'm going to vent it out here - because obviously (that's the right thing to do...). Anyway, for all the people that practice in this disgusting behaviour - the pronunciation is.... (Hmmm - anyone know phonetics?) - "Li-nix" Note: Despite hating him for this - he is otherwise a very nice (but sometimes rather annoying) person. Now... to formally make this a "question" - Could someone write the phonetics for pronouncing "Linux", and also the notorious "Lye-nix", so I can make a note of it for future ventings? I think this is right... L?n?x, NOT L?n?x. ...or perhaps... L?n?x, NOT L?n?x* Can someone confirm the correct phonetics? (Listen to Linus on the matter).

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• winkey + arrow key doesn't move windows to 2nd monitor on linux

  - by Berry Tsakala

  in Windows, win+ <-- and win+ --> snap any window to the left/right side of a monitor, and if pressed again, snap the window to the other monitor, in multi-monitor environment. when a window is maximized, it will "restore" the window first, and at the next win+ <-- key the window will snap. this is very easy to use and remember. But on Linux a maximized window is not affected by win+ <-- , and the user must explicitly un-maximize it (win+down. the window is not moved to another monitor a side-snapped window cannot be resized - it behaves like a maximized window. is there another program that behaves like Windows, or I should write one by myself? (i'm using ubuntu/mint)

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• Where to find Linux drivers for my notebook

  - by smwikipedia

  Perhaps it is not proper to post on this forum. Sorry for any inconvenience. I have finally make up my mind to use Linux (Ubuntu 10.04) as the SOLE operating system on my notebook. The last obstacle is that where to find proper drivers for my devices? Such as: ATI Xpress 200M Video Adapter Texas Instrument SD Card Reader And many more... Could someone give me some advices on where to find these drivers? Many thanks.

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• writing data onto a linux live-dvd

  - by stanleyxu2005

  I have a server machine with a dvd-writer. I want to burn a linux live-dvd (openSUSE is preferred) with a pre-configured web server, so that after booting the web server should be ready to serve. The web server has a sqlite database (with very less data). But after rebooting the system, all data in the database will get lost. Is it possible to store all necessary data onto this live-dvd as well? If it were a usb drive. I would create two partition and mount the second partition with read-write permission. But I have no idea how to create two partition onto a dvd Any hint is appreciated

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• GUI frontend for octave on Linux

  - by Homunculus Reticulli

  I recently installed Octave on my Ubuntu 10.0.4 LTS box. Out of the box, this is a console only app. This makes the learning curve a bit steeper than what I would like it to be, and I am looking for a GUI frontend that looks more like Matlab. I have seen a few project (QtOctave etc), but most of them seem either discontinued, no longer under active development, or are no longer free. Can anyone recommend a good open source/free GUI for Octave on Linux? Preferably, one that is as close as possible to Matlab's GUI.

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• Staggering java linux process startup to prevent OOM

  - by ctennis

  I am running a number of java processes on a single Linux machine. From a memory and computing standpoint, everything is fine when things are static. However, periodically we use a configuration management package up upgrade the jar or war files, and restart the java process. The problem is, that is restarts them all relatively quickly, and so we get 10 or so java VMs restarting all at the same time (we use daemontools for the service stops/starts), which wreaks havoc on the machine, in terms of OOMs or just really slow. This is because it's spawning the JVM 10x at the same time. Other than trying to stagger the startups, is there a smarter way of handling this? Maybe a sysctl tuning performance parameters, or a JVM parameter?

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• How to forward connection from one interface to another under linux

  - by Daniel

  Hi, I have linux box which has two network interface, eth0, eth1. from eth1 I can access an internal website, say under port 8080. from outside the box, I can't access that network. my question is, is there a way I set up something so from outside the box, there appears to be a web server running in port 8080 and when I connect to it, it automatically forwards to eht1 the internal site? I tried to enable ip forward and add a static route, but it doesn't work. thanks.

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• Install multiple Linux OS using WUBI

  - by soul

  I want to install Linux Mint, and Ubuntu on my laptop using Wubi installation. I already installed Ubuntu, but when I launch the Wubi installer for Mint. I got this guy: Does it mean to say that I can only install one os using the wubi? Do you know of any solution to this problem, except by installing mint using the usual way. I have XP and Windows 7 installed on the machine. That's why I'm using Wubi so that I won't get into troubles.

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• linux migration/N high cpu consumption

  - by Alexander

  on my linux appliance based on 3.0.0-14 kernel I got: RPN:/tmp# ps axuf | grep migration root 6 92.9 0.0 0 0 ? S Apr23 2788:33 \_ [migration/0] root 7 99.7 0.0 0 0 ? S Apr23 2993:20 \_ [migration/1] my top is RPN:/tmp# top -b -n1 top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73 Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers Swap: 0k total, 0k used, 0k free, 183168k cached My question: why processes "migration/N" take so much CPU?

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• Ways to remotely reboot a Linux system

  - by dualed

  I had a remote server running Debian Sarge that experienced some HDD failure and I meant to reboot it hoping that fsck could repair the errors automatically. I eventually drove out there and replaced the faulty disks... But I was wondering: What other ways are there to force a Linux system to reboot that do not require hard drive access? What I had tried: shutdown -r now Did not work, as shutdown is a program that would have to be loaded from disk, the error shown in the terminal was bash: /sbin/shutdown: Input/output error init 6 same as above telinit q same as above kill -2 1 This did not print an error, but did not work either. (However, it is possible that the Sarge init did not implement SIGINT, the sarge manpages did not mention it. So it could work in a more recent version of Debian) This guide on PCFreak.net. However, this failed at sysctl, which was not in memory either.

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• linux: accessing thousands of files in hash of directories

  - by 130490868091234

  I would like to know what is the most efficient way of concurrently accessing thousands of files of a similar size in a modern Linux cluster of computers. I am carrying an indexing operation in each of these files, so the 4 index files, about 5-10x smaller than the data file, are produced next to the file to index. Right now I am using a hierarchy of directories from ./00/00/00 to ./99/99/99 and I place 1 file at the end of each directory, like ./00/00/00/file000000.ext to ./00/00/00/file999999.ext. It seems to work better than having thousands of files in the same directory but I would like to know if there is a better way of laying out the files to improve access.

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• boot failure trying to install linux distro from a cd

  - by jdamae

  Hoping someone can help me get this installation from a cd going. I'm using an older pc: hp pavillion 2.66Ghz, 512RAM with a BIOS revision of 6/30/2003. I reclaimed some an older drive (Seagate ST340810A) that seems to be working as its recognized in the bios (auto-detected) I downloaded a mini.iso of ubuntu 10.10 that I want to install and burned the image to a CD for install. My boot sequence is: First Boot Device [CDROM] and I disabled devices 2-4 so I can just force it to read first from the CDROM. This old pc also has a separate CD writer which is a Sec.Slave, so the Sec.Master is the Toshiba DVD/ROM DSM-171 drive where I placed the burned cd with the linux distro. So, with these settings I cannot get it to boot. I get the "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER". Where do I go from here? Thanks.

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• Linux: disbale USB without disabling power

  - by Ergot

  TLDR I want toggle between the following usages of a usb-port via the terminal: use like a normal usb-port only supply energy to charge Story I recently got me something like a magna doodle that can save your drawings to pdf, which can be moved to your computer via usb afterwards. Now the thing is that you can't save anything while it's plugged in. Because it's the only way to charge it, it bugs me that I can't find a software solution and laziness I want to keep it plugged in and toggle the connection to the computer only when needed. I noticed that it's charging and usable when it is plugged in and the computer is shut down or suspened. So I guess that there's a way to do it. Tech info computer: ThinkPad X201 Linux Kernel: 3.14.5-1-ARCH "Magna doodle": Boogie Board Sync

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• Linux - File was deleted and then reappeared when folder was zipped

  - by davee9

  Hello, I am using Backtrack 4 Final, which is a Linux distro that is Ubuntu based. I had a directory that contained around 5 files. I deleted one of the files, which sent it to the trash. I then zipped the directory up (now containing 4 files), using this command: zip -r directory.zip directory/ When I then unzipped directory.zip, the file I deleted was in there again. I couldn't believe this, so I zipped up the directory again, and the file reappeared again but this time could not be opened because the operating system said it didn't exist or something. I don't remember the exact error, and I cannot make this happen again. Would anyone happen to know why a file that was deleted from a directory would reappear in that directory after it was zipped up? Thank you.

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• Configuring linux server firewall to allow access from a certain range of IP addresses

  - by eggman20

  Hi Guys, I'm new to linux server. I'm currently trying to get an Ubuntu 10.10 server up and running for the first time and I'm using Webmin for administration. I'm stuck on the setting up the firewall. What I need to do is to ONLY allow a range of IPs (e.g 128.171.21.1 - 128.171.21.100) to access the HTTP server and Webmin. I've seen a lot of tutorials but none of them fits what I needed. Thanks in advance!

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• Java sound doesn't work under Linux

  - by Cliff

  I just installed Fedora 12 and after downloading and running the Java Sound Demo I get exceptions. If I run just a vanilla Java program that plays a .wav file it runs silently with no sound and no exceptions. Every other app seems to play sound. I also took some advice from this thread in the Ubuntu forums which almost seemed to work. (Installing aoss got rid of the initial exceptions in the sound demo but I still hear nothing when I play.) I'm getting frustrated by the individual hoops I have to go through to eek sound out of my speakers when running Java apps on Linux platforms! Can somebody help me figure out what's wrong?

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• Stupid question: prevent file from being changed under linux

  - by Josh

  Ok. Stupid question. I have forgotten what this is called and without remembering the name the search function on the site and on google is failing me. What's the command under linux to mark a file as "locked"/to prevent any changes from being made to it? I'm not talking about chmod. There's a property that can be set (again the name escapes me at the moment) which prevents even processes running as root from changing a file. What is this called and how do I set it?

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• Cloning a linux system from sdx to cciss

  - by churnd

  I have an HP ML 310 server running CentOS Linux 5.5. I'm buying a RAID card (LSI 9260-8i) to set up a mirrored OS drive. Right now, the boot drive is set up with GRUB installed on the MBR of /dev/sda & has a 100MB /boot partition for /dev/sda1, then the rest is configured in LVM with a 20GB with a 20GB VG for the root partition & ~80GB VG for home. The new disk sizes will also be slightly larger as well. What is the best way to clone the boot drive to the new CCISS device?

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• Emulating CP/M under Linux

  - by gh403

  I need to be able to run a very old piece of software -- the HI-TECH z80 C Compiler for CP/M. It has been released as freeware by HI-TECH. Alas, it only runs on CP/M. After a lot of Googling, I found a page of utilities for UZIX. One of those utilities is a script to abstract away the emulation of a CP/M machine, thus allowing you to use the compiler as you would any other UNIX program. The problem with this script is that it depends on their own CP/M emulator, which unfortunately will not compile on a modern (x64) system. My question: is there a usable CP/M emulator for Linux that could be used in a similar fashion? Specifically, I need to be able to somehow have it access files from the host system, a la DOSBox. I'm willing to rewrite a script (I don't have to re-use the UZIX one); I just need an emulator. Thanks for any help!

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• Troubleshooting "connection reset" error on my linux server

  - by Chris

  I fervently hope someone here can help me with the problem I am experiencing. I am a programmer, and I have very little understanding of linux sysadmin terminology/concepts. I am attempting to troubleshoot a problem with my website. It is a Facebook app, and whenever I try to connect using Chrome, I get an error stating that the "connection was reset". I have been Googling for four days straight trying to find a solution to this problem, but no joy. A big part of the problem is that I do not understand the terminology being employed, and the output from many of the tools referenced is likewise indecipherable to me. I am running a VPS with CentOS 5, apache, PHP, and MySQL. I could spam this post with a ton of information from my iptables, apache, etc but if anyone needs information from my server, please let me know how to get it, and I will post it here. Thank you for any help you can offer!

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• linux xorg dual different monitors mouse border

  - by Metiu

  If I hook an external monitor to my Linux laptop and configure it for dual head with the Gnome system tools, I do get them configured with the proper resolution and position (one to the left of the other) The mouse pointer, however, will apparently use the greatest of the two vertical resolutions. This way, when I move up to the top border, the mouse exits the visible screen, traveling in empty space, and this is quite annoying, because you can't go to the upper panel just by going up very fast. Is there a way of enforcing the right resolutions for the mouse, too? Thank you

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