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• Linux software Raid 10 no superblock

  - by Shoshomiga

  I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os didnt boot up and went into initramfs instead, saying that drives were busy but I eventually managed to bring the raid up by stopping and assembling the drives. The os booted up and said that there were filesystem errors, I chose to ignore because it would remount the fs in read-only mode if there was a problem. Everything seemed to be working fine and the 2 drives started to rebuild, I was sure that it was a sata controller failure because I had dma errors in my log files. The os crashed soon after that with ext errors. Now its not bringing up the raid, it says that there is no superblock on /dev/sda2. I tried to reassemble manually with all the device names but it still would not bring up the raid 10 complaining about the missing superblock on sda2, and sda1 was also dropped from the raid 1. When I did examine on the raid10 it says that 1 of the initially failed drives is a spare, the other is spare rebuilding and sda2 is removed. It seems that sda decided to fail right when the system was vulnerable to it because when I boot up a live cd it spews out sda unrecoverable read failures. I have been trying to fix this all week but I'm not sure where to go with this now, I ordered more hard drives because I didn't have a complete backup, but its too late for that now and the only thing I could do is mirror all the hard drives onto the new ones (I'm not sure whether sda was mirrored without errors). On the internet I read that you can recover from this by recreating the array with the same options as when it was made, however because sda is failing I cant use it and I don't want to risk using its mirror instead, so I'm waiting to get another hard drive. I'm also not sure whether to include the out of sync drives or if I can actually use those instead to recover the array. Sorry if this is a mess to read but I've been trying to fix this all day and its late at night now, any thoughts on this would be greatly appreciated. I also did a memtest and changed the motherboard in addition to everything else. EDIT: This is my partition layout Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0009c34a Device Boot Start End Blocks Id System /dev/sdb1 * 2048 511999 254976 83 Linux /dev/sdb2 512000 3904980991 1952234496 83 Linux /dev/sdb3 3904980992 3907028991 1024000 82 Linux swap / Solaris

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• linux + automated rsync command

  - by Diana

  my target is to copy /tmp/my_file from 10.10.10.1 to my Linux machine without login and password , I set the passwords file with the right password - secret123 so rsync should work , please advice why I get Permission denied. Remark - 10.10.10.1 address is linux machine version – red hat 5.3 rsync -WavH --password-file=/tmp/passwords --progress [email protected]:/tmp/my_file . Permission denied. rsync: connection unexpectedly closed (0 bytes read so far) rsync error: error in rsync protocol data stream (code 12) at io.c(165) more /tmp/passwords secret123 ls -ltr passwords -rwxr-xr-x 1 root root 10 Sep 12 17:32 passwords

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• GUI session from Mac to Linux, over WAN

  - by kellogs

  Closest thing I could find here was this I am on Mac OS 10.5.6 with X server installed. This is the machine I am trying to get GUI session data onto. There is an Ubuntu 11.10 Linux on which I have installed an X server and GDM. This is the machine where the GUI session data should come from. Currently, I got to the point where Linux listenes on port TCP 6000 for its clients. 1 - how do I swap port 6000 for port 6767 ? 2 - how do I connect to 6767 from my Mac ? Thanks

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• SVN Notifier for linux?

  - by mnml

  I would like to know if there is any version of this software for linux or any equivalent: svn notifier

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• Change Linux Console's Default Monitor

  - by Tim M

  Is there any way to specify which monitor the console is displayed on in Linux? Details: I have a 3 monitor setup with 2 video cards. When I boot the computer, the BIOS displays on the PCI graphics card (which has a small monitor). When starting Linux, the console is displayed on the same monitor. Is there a way to have the console output on a different monitor? I'm using the vesafb framebuffer. I don't see a way in my BIOS to change the default video card.

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• No break compatible with Linux box?

  - by Somebody still uses you MS-DOS

  I'm buying this unit from deal extreme: it's a bitorrent downloader, with NAS capability. I'm interested in sharing an external HD in it, with media and backup purposes. I'm afraid of energy problems (don't know if this is the correct term), corrupting my mounted drives (like after a storm), so I thought about buying a No Break that sends a "signal" to my Linux box, and a script in my Linux box would unmout everything to avoid problems. Do this "No Break signal" feature exists? Do you have model suggestions? Thanks!

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• Android strace in Real device

  - by Martin Solac

  I have the following situation, I want to monitor the system calls on Android phones so I made an script to do that. With Android Emulator works perfectly (writes the traces of the application in a specific file on my Ubuntu). The problem is when I attach a real phone to analyze it, it says the following in the result file: ptrace attach failed: Operation not permitted I'm using this code to get it, but I don't understand why it works on the emulator and not in the rooted real device. This is the comand I use in perl: system("$dirTools/adb -s $Device shell strace -p $PID[1]>$dirRecordDataSet/$Date/$appName &"); Any suggestion? Thanks in advance

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• Shrinking physical volumes in LVM on a Linux Guest in ESXi 5.0

  - by Stew

  The problem: Linux guest (OpenSuse 12.1), with multiple virtual disks attached. 3 disks are in a logical volume, two of which are exactly 2TB. None of the disks are independent, and due to the backup software we use, cannot be independent. When the two 2TB virtual disks are "dependent", the snapshot fails stating that the file is too large for the datastore. When I put those two disks in independent mode, snapshots work fine (the other disk is 1.8TB). I have therefore concluded that even shrinking the two physical disks by 100GB should solve the problem, however I am having trouble conceptualizing how to go about getting those disks smaller without breaking the LVM entirely. The actual LV has 1.3TB free, so there is plenty of space to shrink with. What I need to accomplish: Deallocate 100GB from the two, 2TB virtual disks within the linux guest. Shrink the two virtual disks by 100GB within vsphere (not as complicated). Are there any vsphere/LVM gurus that can give me a clue?

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• seamless mode remote desktop connection from linux to windows

  - by mateusz.fiolka

  I am a programmer using Linux as my main OS, however sometimes I need to use windows (ie, office, ea). I'm running qemu with kvm to access the windows "machine". I would like to achieve something that is described here: https://help.ubuntu.com/community/SeamlessVirtualization (It means I would be able to run chosen applications on Windows and then display them locally on Linux as separate windows achieving good desktop integration). However seamless rdp is buggy and doesn't work on my machine (probably because I'm using a tiling window manager and a 64bit system). Are you aware of any other solution then rdp seamless mode? I would prefer to still use quemu because it uses cpu hardware virtualization, so different protocol/client combination would be preferable.

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• Sharing accounts between multiple computers running Ubuntu Linux

  - by john

  My school has a computer lab full of machines running Red Hat Linux. They have it set up so that you can log into any computer in the lab, and it automatically loads your desktop, home directory, etc, which makes it so all computers in the lab look the same to you, regardless or which one you're using. I have two computer at home running Ubuntu Linux. Could I do this same thing with my computers at home? What's it called, and how do I find documentation on how to set it up? Thanks!

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• save as pdf in linux

  - by Neilvert Noval

  I have seen how simple it is for Mac OS to generate pdf from a document without additional software to install. But I am looking for this functionality in Linux. One scenario, for example, if I have myDocument.txt that contain an article, how can I convert this into pdf? My next question is, assuming that myDocument.txt is a 3-paged document, will it generate a 3-page continuous pdf and not just 3 separate pdfs? Any tools for linux that does this? (GUI is fine, but commandline is preferable)

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• Java Development in Linux

  - by Zac

  I'm a developer and am brand new to Linux (Ubuntu): I'm wondering what the "best practices dictate" for what FHS directories to install various tools to. Things I'll be installing: Eclipse & plugins GlassFish SVN ...etc. I see that /opt is for holding additional ("optional") software packages, but also see /usr as a place for utils and apps. In another post a user recommended I create an entire partition for /srv alone, and to do my staging there (I assume he meant that /srv is where GlassFish and other servers should go?). So basically: what FHS directories do Linux developers use for which type of tools? Thanks for any input here

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• Storage of various linux config files

  - by stantona

  I'm using git to track/store all my various config files required for linux. They're organized as if they live in my home directory, eg: .Xresources .config/ Awesome rc.lua .xmodmap .zshrc vim/ <- submodule emacs/ <- submodule etc I use git submodules for other things like vim/emacs configuration (since I also want to keep those separate repos). I'm thinking of creating a shell script to create the various links to these files. The goal is to make it easier to setup another linux painlessly. Is this a reasonable idea? Is there a preferred approach? I'm mostly interested in hearing how others people store their configs.

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• Free / Cached / Available memory on Linux

  - by pkoraca

  I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios mem_usage script to sum free and cached memory, but would that be correct information? I doubt that they misunderstood Linux memory usage. Lets say I have 8 GB RAM. 5 GB are used, 2 GB is cached, and I have 1 GB of free memory. Real available memory should be free+cached (3 GB)? If some new application would need additional 3 GB RAM, could it take everything from cache and free without using swap, or is there a minimum that should be in cache? Real example: $ cat /proc/meminfo MemTotal: 5984256 kB MemFree: 137052 kB Buffers: 140484 kB Cached: 3439616 kB SwapCached: 244 kB Active: 3148824 kB Inactive: 2341768 kB ... My monitoring tools show that I have 137 MB free RAM, however I have ~3,5 GB in Cache. Thanks!

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• Using Hamachi VPN to connect to Linux VM at home

  - by Cameron Verotti

  I have a CentOS 5.10 Linux box at home running on VMWare, with Windows 2008 as the host. I have set up a Hamachi VPN so that I can connect to the Host server from work, I attempted to add a second VNIC to the VM and bridged it to the hamachi Network Interface. I spun up the VM and checked eth1 with ifconfig and its throwing me a ipv6 address not a ipv4. I want to hook this VM up so that I can run a ssh command from work to the VM. MY network at home is all on Local 198.168.. hence the need to make a VPN network like Hamachi. I cannot seem to find anything that tells me or helps me with tunneling my Linux VM via Hamachi. Any help would be fantastic!

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• Linux and Windows machines sharing a network

  - by Saif Bechan

  I have different Windows and Linux machines that share an internal private network. From within this network I can SSH to every machine etc. This internal network works great. I have my main windows machine from where I control these machines either trough SSH or virtual desktop. Is there a way for me on my main machine to see all the machines that are connected to the network. I want to be able to see all the machines and maybe browse them, share files etc. I am very new to networking of this kind so any recommendations are welcome. Should I set up this network by workgroup? I do not think Linux supports that. Or should I set up the network with domain, I never did that before.

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• **Simplest** way to dual boot Linux on a Vista laptop

  - by user20285

  I have a 64bit Vista laptop with no cd drive (and no intention of buying one). What is the simplest way (if any) for me to dual boot Linux (I don't care what version as long as it's not too old...and will run Ruby 1.8.7 or greater)? I'd prefer anything with an installer. I've been programming on Windows for a little over 1.5 years and would like the option of using Linux. I'm not a moron, but the I'm legitimately scared of messing up my computer. I speak the language of Rails, not of OS tweaks. Thanks!

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• ipod touch crashing after uploading app to device

  - by MaKo

  hi, I installed a new device (the second out of the 100), on xcode, an iPod touch but when I upload the app, the iPod crashes, apple logo shows, and gets frozen for a while, and then resusitates, in the xcode, I get the message on console: The Debugger has exited due to signal 15 (SIGTERM). I tried a simple app I made, and it loaded it, (some bouncing ball) after starting again, but tried the same with another app that plays some sounds and it shows normally, but doesnt play the sounds, questions: how to fix this issue? (in MyApp-info.plist, in bundle identifier, I have: com.yourcompany.${PRODUCT_NAME:rfc1034identifier} havent changed this, is this a problem?? 1.b. I used that conf to upload to an iPad with no problem?? Do the apps play normally sounds *.m4a, in the simulator it works!, not in the iPod, is this due to the crash or not? Thank you,, edit Im using AudioToolbox framework, the question after 1.b is 2 in my editor, but appears as 1 in the post??

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• Cant see my wireless internal card on BackTrack 5

  - by Tomer

  I have BackTrack 5 R3 installed on VMware and its on bridged connection so it gets its own ip on my network and it works I get internet connection but there is no ethernet cable connected yet somehow when I do iwconfig I cant see wlan0 and no other wireless card but etho is connected to the network somehow.... cant it be that eth0 is my wireless card which somehow misconfigured? Its an intel centrino advanced n 6205

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• log execution of certain commands on linux

  - by jlsksr

  I have to maintain a system (debian) on which several users are allowed to install programs - so I would like to log, for example, if anyone executes "apt-get install" or "apt-get purge", so I can keep track of manually installed packages.. I'm looking for a general way to achieve this; it's not just APT, but several programs/scripts etc. Any ideas? /edit a google-search with few different keywords brought up this: http://serverfault.com/questions/201221/how-to-log-every-linux-command-to-a-logserver http://stackoverflow.com/questions/15698590/how-to-capture-all-the-commands-typed-in-unix-linux-by-any-user http://sourceforge.net/projects/rootsh/

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• What are some good installation tools for Linux?

  - by George Edison

  Excluding package managers, what are some good installation tools for creating software installation programs on Linux? (for example, AutoPackage)

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• iotop for Linux kernel 2.6.18

  - by Lightsauce

  So it has to come to my attention that iotop isn't availalbe for 2.6.18 since it's less than 2.6.20 and requires Python 2.6+. I've done some research and came across this article: http://lserinol.blogspot.com/2009/09/io-usage-per-process-on-linux.html According to this, if these process have io stats in /proc/pid#/io (where pid# is the process #) it's doable regardless of the kernel version. So, in reality, I could upgrade Python to 2.6 and test out iotop. However, my flavor of Linux, CentOS release 5.5 (Final), only supports Python 2.4.3-44.el5 currently. If I were to do uninstall from yum, it doesn't look so pretty. It ends up wanting to uninstall 235 packages, most of which are very important! I read in one place, online (I forget the URL from yesterday), that you can install Python 2.6+ parallel to this one, and have the rpm install for iotop use that. Well, I didn't choose that route. I figured, what the heck, lets write iotop (not copying it, but reverse engineering it without actually looking at it's code/it in use) in bash. I thought it would just grab the /proc/pid#/io file and parse stats. So I wrote a script to grab the top 10 rchar, wchar, read_bytes, and write_bytes by collecting all these stats from all the /proc/pid#/io files, sorting them by each metric, then grabbing the top 10 highest values. The conclusion, the data seems completely useless. Does anybody know any resources for advanced Linux where I can figure out how to take these /proc/pid#/ directories and figure out what the heck they are doing with io on the disk? My main goal is to figure out what exactly is causing high load on my disk. I just know it's on the / partition (/dev/sda2 in this case), and I'm not really sure how to narrow it down without the help of iotop. If I run iostat to grab metrics for 1 minute, every second, the first result it gives me shows a high 'kB_read/s', so that makes me think, it's reading mostly. However, if I watch the update it gives me every second, it's actually just showing values for kB_wrtn/s. This makes me think the initial value iostat gives me is misleading.

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• How to uninstall software in Linux .

  - by TopCoder

  how to uninstall software in linux. I am facing issues installing No machine setup(NX)

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• Installing Oracle11gr2 on redhat linux

  - by KItis

  I have basic question about installing applications on linux operating system. i am going to express my issue considering oracle db installation as a example. when installing oracle database , i created a user group called dba and and user in this group called ora112. so this users is allowed to install database. so my question is if ora112 uses umaks is set to 077, then no other uses will be able to configure oracle database. why do we need to follow this practice. is it a accepted procedure in application installation on Linux. please share your experience with me. thanks in advance for looking into this issue say i install java application on this way. then no other application which belongs to different user account won't be able use java running on this computer because of this access restriction.

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• Testing on blackberry device - adding and removing app multiple times

  - by Kai

  It would be useful for many people to know how to completely remove an application from your device when testing. I have downloaded my app many times now, and likewise have deleted it many times. The problem is when deleting the app, it does not remove things like the persistent object related to my app, or the images downloaded through the app. So, when I download the next build, I have no idea if something broke that is related to building the persistent object or fetching the images since those elements already exist from the last build. I don't know if this is a cache thing. I don't know if this is expected and I have to use some utility to wipe this data after deleting the app. I can't really find much info through basic web searches. Any information would be appreciated. Blackberry Bold 9000. 4.6 OS. tested with both SD card and no SD card.

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