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• How to stop a infinite running process(ztail) started by a ssh session after that session is closed

  - by Sanath Adiga

  I have a peculiar problem. My server supports multiple ssh session simultaneously, so that multiple admins can manage it simultaneously. We have a command which calls ztail to show the compressed log files and when the current ssh session is closed (without pressing ctrlc, to stop the tail command), the command should ideally stop working. But what I observed when I start a new ssh session is that the process ztail is still running in the background and consuming CPU, even though the previous session was closed. How can I determine when the session is closed, so that I can use that variable/flag to close/stop any commands initiated by that previously closed session?

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• Oracle Linux / Symantec Partnership

  - by Ted Davis

  Fred Astaire and Ginger Rogers sang the now famous lyrics:  “You like to-may-toes and I like to-mah-toes”. In the tech world, is it Semantic or is it Symantec? Ah, well, we know it’s the latter. Actually, who doesn’t know or hasn’t heard of Symantec in the tech world? Symantec is thoroughly engrained in Enterprise customer infrastructure from their Storage Foundation Suite to their Anti-Virus products. It would be hard to find anyone who doesn’t use their software. Likewise, Oracle Linux is thoroughly engrained in Enterprise infrastructure – so our paths cross quite a bit. This is why the Oracle Linux  engineering team works with Symantec to make sure their applications and agents are supported on Oracle Linux. We also want to make sure the Oracle Linux / Symantec customer experience is trouble free so customer work continues at the same blistering pace. Here are a few Symantec applications that are supported on Oracle Linux: Storage Foundation Netbackup Enterprise Server Symantec Antivirus For Linux Veritas Cluster Server Backup Exec Agent for Linux So, while Fred and Ginger may disagree on how to spell tomato, for our software customers, the Oracle / Symantec partnership works together so our joint customers experience and hear the sweet song of success.

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• Linux Mint 13 is not booting on dual boot computer

  - by Brian

  thanks in advance for your time. I have 2 hard drives in my computer a 300 GB drive which is my primary drive for windows 7 and a 1.5 TB drive that I'd used for storage. When I got it I partitioned 500 GB for use in Linux. So, I created a bootable USB and clicked the "Install by Current Operating System" option from Mint. It installed it to the free 500 GB like I'd hoped it would. Now, I can't get it to boot though. I've tried using EasyBCD to create the boot entry and it hangs on a black screen. Thanks. EDIT @ Ryhuk It presents a menu with two options 1) Windows and 2) Mint. This was a menu I created with easyBCD. When I select option 1 it boots to windows fine. When I select option 2 it hangs on a black screen with just a white bar flashing (Can't remember what its called, it marks the current cursor location on a text field) and won't respond to any key presses but alt ctrl del.

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• Can't access my accelerated hard disk from msdos after installing linux on ssd cache

  - by Chibueze Opata

  I mistakenly installed Linux Mint on my ssd (forgot my PC actually came with one), when it detected a ~31GiB disk that it wanted to install to, I was a bit confused since I had brought out 30Gb in my primary disk for it, but I clicked continue. After installation, I tried to boot back into my Windows and it brought out some Intel Raid Disk Utility stuff saying I should disable acceleration on a disk something couldn't be found, I canceled it but whatever I tried, recovery tools, setups etc, I couldn't just access the drive which was apparently using the SSD as cache. Since then I've been stuck. I tried setting the 'raid' flag to the disk from 'gParted', still I couldn't. I tried the diskraid utility from windows recover disk, it said it couldn't detect any raid, diskpart sees the partition but doesn't see the volume, when I remove the raid flag, it sees the volume as one of raw type, and I can't access anything. I can however mount the drive from terminal in Mint and access my files, but I don't have any backup media at the moment so I can do a factory re-install. Please how do I go about solving the issue, precisely I would like to know how to boot into the drive again. Thanks!

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• A tiered approach to cloning linux partitons

  - by Djurdjura

  I'm looking at a strategy for cloning Linux (root) partitions without having to use a Live CD. Literature suggests rightly that the source and target partitions must be umounted to be able to get a clean clone. This assumes that you need to use a LiveCD. I was wondering if instead of requiring a LiveCD, if using a 3rd partition that would emulate the LiveCD functionality, if we can't achieve the same functionality. In other words, at a high level a system with 3 partitions (all bootable): Rescue Partition (LiveCD emulation) Running Partition (Source) Backup Partition (Destination) All 3 partitions are LVMS. When it's time to clone the source partition to the backup (destination) partition, we would boot to the rescue partition, unmount the other 2 partitions (is it required?), run disk check on the source, copy to the destination (dd or simple copy to avoid replicating the defragmentation from the source), run disk check on the destination partition, update Grub menu list to force boot from either partition, and reboot into that partition. My question, is it an approach that you'd recommend? MBR in all this? Any gotchas or extra checks required? Thanks, D. PS. On recommendation from members, posting here instead of stackoverflow.com.

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• How to prevent Linux from deleting temporary files on shutdown

  - by Rajorshi

  Hi, I am using Ubutu 10.04. I have some apps that create a few temporary files in /tmp/<file> as part of their shutdown process. I want to inspect those files when the apps are closed in the event of a system shutdown. However, when the system comes up again I find that all temporary files have been deleted. How can I ask the system not to clear the files in /tmp/ on shutdown?

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• Linux buffer cache effect on IO writes?

  - by Patrick LeBoutillier

  I'm copying large files (3 x 30G) between 2 filesystems on a Linux server (kernel 2.6.37, 16 cores, 32G RAM) and I'm getting poor performance. I suspect that the usage of the buffer cache is killing the I/O performance. To try and narrow down the problem I used fio directly on the SAS disk to monitor the performance. Here is the output of 2 fio runs (the first with direct=1, the second one direct=0): Config: [test] rw=write blocksize=32k size=20G filename=/dev/sda # direct=1 Run 1: test: (g=0): rw=write, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1 Starting 1 process Jobs: 1 (f=1): [W] [100.0% done] [0K/205M /s] [0/6K iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=4667 write: io=20,480MB, bw=199MB/s, iops=6,381, runt=102698msec clat (usec): min=104, max=13,388, avg=152.06, stdev=72.43 bw (KB/s) : min=192448, max=213824, per=100.01%, avg=204232.82, stdev=4084.67 cpu : usr=3.37%, sys=16.55%, ctx=655410, majf=0, minf=29 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued r/w: total=0/655360, short=0/0 lat (usec): 250=99.50%, 500=0.45%, 750=0.01%, 1000=0.01% lat (msec): 2=0.01%, 4=0.02%, 10=0.01%, 20=0.01% Run status group 0 (all jobs): WRITE: io=20,480MB, aggrb=199MB/s, minb=204MB/s, maxb=204MB/s, mint=102698msec, maxt=102698msec Disk stats (read/write): sda: ios=0/655238, merge=0/0, ticks=0/79552, in_queue=78640, util=76.55% Run 2: test: (g=0): rw=write, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1 Starting 1 process Jobs: 1 (f=1): [W] [100.0% done] [0K/0K /s] [0/0 iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=4733 write: io=20,480MB, bw=91,265KB/s, iops=2,852, runt=229786msec clat (usec): min=16, max=127K, avg=349.53, stdev=4694.98 bw (KB/s) : min=56013, max=1390016, per=101.47%, avg=92607.31, stdev=167453.17 cpu : usr=0.41%, sys=6.93%, ctx=21128, majf=0, minf=33 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued r/w: total=0/655360, short=0/0 lat (usec): 20=5.53%, 50=93.89%, 100=0.02%, 250=0.01%, 500=0.01% lat (msec): 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.12% lat (msec): 100=0.38%, 250=0.04% Run status group 0 (all jobs): WRITE: io=20,480MB, aggrb=91,265KB/s, minb=93,455KB/s, maxb=93,455KB/s, mint=229786msec, maxt=229786msec Disk stats (read/write): sda: ios=8/79811, merge=7/7721388, ticks=9/32418456, in_queue=32471983, util=98.98% I'm not knowledgeable enough with fio to interpret the results, but I don't expect the overall performance using the buffer cache to be 50% less than with O_DIRECT. Can someone help me interpret the fio output? Are there any kernel tunings that could fix/minimize the problem? Thanks a lot,

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• Linux buffer cache effect on IO writes?

  - by Patrick LeBoutillier

  Hi, I'm copying large files (3 x 30G) between 2 filesystems on a Linux server (kernel 2.6.37, 16 cores, 32G RAM) and I'm getting poor performance. I suspect that the usage of the buffer cache is killing the I/O performance. To try and narrow down the problem I used fio directly on the SAS disk to monitor the performance. Here is the output of 2 fio runs (the first with direct=1, the second one direct=0): Config: [test] rw=write blocksize=32k size=20G filename=/dev/sda # direct=1 Run 1: test: (g=0): rw=write, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1 Starting 1 process Jobs: 1 (f=1): [W] [100.0% done] [0K/205M /s] [0/6K iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=4667 write: io=20,480MB, bw=199MB/s, iops=6,381, runt=102698msec clat (usec): min=104, max=13,388, avg=152.06, stdev=72.43 bw (KB/s) : min=192448, max=213824, per=100.01%, avg=204232.82, stdev=4084.67 cpu : usr=3.37%, sys=16.55%, ctx=655410, majf=0, minf=29 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued r/w: total=0/655360, short=0/0 lat (usec): 250=99.50%, 500=0.45%, 750=0.01%, 1000=0.01% lat (msec): 2=0.01%, 4=0.02%, 10=0.01%, 20=0.01% Run status group 0 (all jobs): WRITE: io=20,480MB, aggrb=199MB/s, minb=204MB/s, maxb=204MB/s, mint=102698msec, maxt=102698msec Disk stats (read/write): sda: ios=0/655238, merge=0/0, ticks=0/79552, in_queue=78640, util=76.55% Run 2: test: (g=0): rw=write, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1 Starting 1 process Jobs: 1 (f=1): [W] [100.0% done] [0K/0K /s] [0/0 iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=4733 write: io=20,480MB, bw=91,265KB/s, iops=2,852, runt=229786msec clat (usec): min=16, max=127K, avg=349.53, stdev=4694.98 bw (KB/s) : min=56013, max=1390016, per=101.47%, avg=92607.31, stdev=167453.17 cpu : usr=0.41%, sys=6.93%, ctx=21128, majf=0, minf=33 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued r/w: total=0/655360, short=0/0 lat (usec): 20=5.53%, 50=93.89%, 100=0.02%, 250=0.01%, 500=0.01% lat (msec): 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.12% lat (msec): 100=0.38%, 250=0.04% Run status group 0 (all jobs): WRITE: io=20,480MB, aggrb=91,265KB/s, minb=93,455KB/s, maxb=93,455KB/s, mint=229786msec, maxt=229786msec Disk stats (read/write): sda: ios=8/79811, merge=7/7721388, ticks=9/32418456, in_queue=32471983, util=98.98% I'm not knowledgeable enough with fio to interpret the results, but I don't expect the overall performance using the buffer cache to be 50% less than with O_DIRECT. Can someone help me interpret the fio output? Are there any kernel tunings that could fix/minimize the problem? Thanks a lot,

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• Preinstalled Windows 8 and Linux UEFI dual boot on a laptop

  - by itchy355

  I am trying to set up Windows 8 and Arch Linux on a new Sony Vaio E14 with preinstalled windows 8. So far: installed W8 to my new SSD (switched for the original HDD) using Recovery Media shrunk the W8 partition, deleted recovery partition, disabled swap confirmed W8 booting just fine On to Arch: disabled Secure Boot in bios confirmed W8 booting just fine Booted Arch off the CD and installed everything to 4th and 5th partition set up rEFInd for EFIstub kernel bootloader After that it got worse. I was unable to boot anything else than Windows 8 (although I was glad that they at least kept working just fine). Tried: creating EFI\refind\ and putting the .efi there (as per Arch manual overwriting EFI\boot\bootx64.efi overwriting EFI\Microsoft\Boot\bootmgr.efi overwriting EFI\Microsoft\Boot\bootmgfw.efi --- YAY rEFInd shown up! So far, so good. I've kept the whole W8 Boot\ directory in EFI\windows8 and set up a boot menuentry for it; and it booted just fine. But, upon restart, everything was wrong -- 'Operating system not found' instead of any bootloader (refind or w8). Booted back into Arch using the live CD to find out that the EFI partition had erroneous FAT table. fsck.vfat fixed it, and I've found that EFI\Microsoft\Boot was back to it's original state (all refind files deleted and replaced with W8 bootloaders). I've overwritten them again and got back to rEFInd showing up correctly and Arch being perfectly bootable. After that I've tried only renaming EFI\Microsoft\Boot\bootmgfw.efi to bootmgfw.001.efi (then copying refind's .efi to bootmgfw.efi and keeping EVERY OTHER file as it was), but with exactly the same result. Tried marking the GPT EFI partition as read-only, same result. Now I'm kinda out of luck. Arch boots fine, so does W8 but it destroys the EFI partition in the process. Thanks for any ideas, Googling brought me this far and I can't find any better. PS -- windows 8 MAYBE destroys the partition upon shutdown -- when I order a shutdown in W8, it takes unusually long (about half a minute instead of ~5 seconds). So in theory I could solve this by hard-resetting the laptop instead of a normal shutdown, but that's just not nice.

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• How to add/remove codecs in linux

  - by agg

  Friends, I'm new to Linux, I need to work on Linux. I have ported Linux to AT91SAM9261-EK board. Now i need to work on Codecs. I just know the definition of codec from wikipedia, Now i need add my own codec to the board. I want to know, Where codec will be preset in 1)File System, 2)Kernel or 3)Player And how to add codec while building entire source, please tell me the steps i need follow. And also how to remove the codec. How to play the video files from pendrive in console, now i can play audio by command 'mplayer "filename" '. Don't know how to play video. Please help me, How to do this. Regards AGG

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• High load average due to high system cpu load (%sys)

  - by Nick

  We have server with high traffic website. Recently we moved from 2 x 4 core server (8 cores in /proc/cpuinfo), 32 GB RAM, running CentOS 5.x, to 2 x 4 core server (16 cores in /proc/cpuinfo), 32 GB RAM, running CentOS 6.3 Server running nginx as a proxy, mysql server and sphinx-search. Traffic is high, but mysql and sphinx-search databases are relatively small, and usually everything works blazing fast. Today server experienced load average of 100++. Looking at top and sar, we noticed that (%sys) is very high - 50 to 70%. Disk utilization was less 1%. We tried to reboot, but problem existed after the reboot. At any moment server had at least 3-4 GB free RAM. Only message shown by dmesg was "possible SYN flooding on port 80. Sending cookies.". Here is snippet of sar 11:00:01 CPU %user %nice %system %iowait %steal %idle 11:10:01 all 21.60 0.00 66.38 0.03 0.00 11.99 We know that this is traffic issue, but we do not know how to proceed future and where to check for solution. Is there a way we can find where exactly those "66.38%" are used. Any suggestions would be appreciated.

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• Linux Mint 14 severe overheating

  - by agvares

  I've tried switching to Mint (it was Mint 12) about 6 months ago, but failed to do it due to enormous overheating which made it virtually impossible to run any applications more complex than Gedit. Time had passed, and now I'm back again with Mint 14, but feeling way more determined. What I face are the following issues: 1) Great overheating (and by great I mean that just by doing nothing my CPU temp is floating around 70-75 C, which I find a lot) 2) Running multiple applications (let's say Chrome, Skype and Pidgin) results in critical overheating and immediate shutdown of the system 3) Due to the stuff listed above, my battery drains in about 10-15 minutes, pretty much turning my laptop into a crippled desktop machine I've got a HP-dv6 laptop (i7, 6gb RAM, dual graphics) Here's the output of lspci: 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5) 00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5) 00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5) 00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05) 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler XT [AMD Radeon HD 6700M Series] 07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06) 0d:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01) 13:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01) 19:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04) what i've tried to do already: 1) I've edited my grub file to add some "splash" arguments there 2) Installed jupiter and powertop 3) Tried to upgrade to newer kernels (up to 3.8), btw running anything newer than 3.5 results in both resolution and wi-fi detection fail 4) Read lots of forum threads devoted to the topic So, my question is simple: What else might I do to become finally able to use Mint as my default OS without the risk of being burned alive by the CPU heat?

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• Oracle Linux Training Across Five Continents

  - by Antoinette O'Sullivan

  The Oracle Linux System Administration course, a top selling course, provides you with a broad selection of key competencies you need to be a great Linux system administrator. And you can now take this course from your desk or in classrooms across all five contents. You can take this 5-day instructor-led course through the follow delivery methods: Training-on-Demand: Start training within 24 hours of registering. You following lecture material at your own pace via streaming video and book time on a lab environment to suit your schedule. Live-Virtual Event: Follow a live event from your own desk, no travel required. You can choose from a selection of events on the schedule to suit a different time zones. In-Class Event: Travel to an education center to take this course. Below is a selection of the in-class events already on the schedule. AFRICA  Location  Date  Delivery Language  Nairobi, Kenya  13 October 2014  English  Johannesburg, South Africa  24 November 2014  English AMERICA  Location  Date  Delivery Language  Mississauga, Canada  27 October 2014  English  Chicago, IL, United States  13 October 2014  English  Roseville, MN, United States  13 October 2014  English ASIA  Location  Date  Delivery  Jakarta, Indonesia  20 October 2014  English  Petaling Jaya, Malaysia  25 August 2014  English  Kuala Lumpur, Malaysia  8 December 2014  English  Istanbul, Turkey  10 November 2014  Turkish   Dubai, United Arab Emirates  4 January 2015  English AUSTRALIA  Location  Date  Delivery Language  Canberra, Australia  20 October 2014  English  Melbourne, Australia  20 October 2014  English EUROPE  Location  Date  Delivery Language  Paris, France  6 October 2014  French  Milan, Italy  20 October 2014  Italian  Rome, Italy  8 September 2014  Italian  Bucharest, Romania  27 October 2014  Romanian  Madrid, Spain  1 September 2014  Spanish The Oracle Linux System Administration course is the recommended training course to prepare for you for the Oracle Linux 5 & 6 System Administrator OCA certification exam. Those who have acquired the skills provided in the Oracle Linux System Administration course, can advance their learning by taking the Oracle Linux Advanced Administration course. You can take this 5-day instructor led course as a live-virtual event or an in-class event. Below is a selection of the in-class events on the schedule:  Location  Date  Delivery Language  Jakarta, Indonesia  27 October 2014  English  Kuala Lumpur, Malaysia  6 October 2014  English  Bangkok, Thailand  20 October 2014  English  Belmont, CA, United States  15 September 2014  English For information on the Oracle Linux curriculum, go to http://oracle.com/education/linux.

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• want to restore windows 7 from linux ubuntu

  - by elisi

  Hi, I want to recovery Win7 from Linux and I dont have the Win7 CD or any previous back up files. Please tell me if there is a way to recovery Win7 from Linux because I do not want to boot it from the beginning cause I have important files and they are in one partition.

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• Where is the code for copy and paste functionality located in Linux?

  - by Simonw

  Hi, I'm just wondering where in the source files of a linux kernel I would be able to find the code which takes care of copying and pasting? I'm interested in modifying it but don't know where to look to find it. Thanks

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• 8 Deadly Commands You Should Never Run on Linux

  - by Chris Hoffman

  Linux’s terminal commands are powerful, and Linux won’t ask you for confirmation if you run a command that won’t break your system. It’s not uncommon to see trolls online recommending new Linux users run these commands as a joke. Learning the commands you shouldn’t run can help protect you from trolls while increasing your understanding of how Linux works. This isn’t an exhaustive guide, and the commands here can be remixed in a variety of ways. Note that many of these commands will only be dangerous if they’re prefixed with sudo on Ubuntu – they won’t work otherwise. On other Linux distributions, most commands must be run as root. Image Credit: Skull and Crossbones remixed from Jason Ford on Twitter How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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• Linux Learning curve for a 'Lifetime' windows user [closed]

  - by gary

  I am using windows for almost 8-10 years and have never worked on linux. Mostly i used to work in VB, VC++ MFC and little bit of .NET(C# and VB) so i didn't bother about Linux. But now when i got an opportunity to work with linux i dont want to miss it, here are my questions : Where can i find useful resources for Linux newbies? Which books/Tutorials will you suggest to start? Which distro shall i use? What was your experience while moving from Windows to Linux?

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• Where can I find linux-kernel-headers-x.x.x.x for SUSE?

  - by Landy

  I'm installing VMware Workstation on a SLED 11 SP1, and the installation is blocked by an error message "Kernel headers for version 2.6.32.27-0.2-default were not found". If you installed them in a non-default path you can specify the path below. Otherwise refer to your distribution's documentation for installation instructions and click Refresh to search again in default locations. The output of rpm -qa | grep kernel is kernel-default-2.6.32.27-0.2.2 kernel-default-base-2.6.32.27-0.2.2 linux-kernel-headers-2.6.32-1.4.13 kernel-default-extra-2.6.32.27-0.2.2 nfs-kernel-server-1.2.1-2.10.1 I had met this issue in Ubuntu and I installed the required linux header via apt-get then the issue disappeared. But in SLED, I didn't find the rpm package in SUSE's software repository, and I also google "linux-kernel-headers-2.6.32.27" but did not match any documents. Any suggestion will be highly appreciated. Thanks. The output result of zypper se kernel | grep kernel is i | linux-kernel-headers | Linux Kernel Headers | package | linux-kernel-headers | Linux Kernel Headers | srcpackage

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• Linux Kernel Messages: ata1.00: status: { DRDY ERR }

  - by PM

  I am receiving a lot of these messages. Is my HD going to die tomorrow morning? ata1: link is slow to respond, please be patient (ready=0) ata1: device not ready (errno=-16), forcing hardreset ata1: soft resetting link ata1: clearing spurious IRQ ata1: clearing spurious IRQ ata1: clearing spurious IRQ ata1.00: configured for UDMA/33 ata1: EH complete ata1.00: qc timeout (cmd 0xa0) ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen ata1.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)

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• Networked Parallel Port in Linux / KVM / QEMU

  - by korkman

  What I want to use is the "-parallel" tcp or udp option from KVM / QEMU, but I don't seem to find any server for this client. I don't serve a printer but a hardware dongle. I checked ser2net, which does provide "/dev/lp0" sharing, but it doesn't seem to work for KVM / QEMU. I suspect KVM / QEMU requires "/dev/parport0". I did rmmod lp, modprobe ppdev, linked ser2net to parport0, but it didn't work out. Perhaps ser2net is not suited for this. I tried socat as well, and I tried netcat. No success. Does anyone know any KVM / QEMU compatible parallel port server? Or did any of netcat, socat or ser2net work for you?

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• Passwords and Keys in Linux

  - by PeanutsMonkey

  In a fit of desperation when I had my wireless connection die on me, I thought it was a problem with the key I had created at the start when I initially configured the wireless connection and hence deleted it. The option to create the key had presented itself when I created the wireless connection. It no longer asks me to. Now I am back online, do I have re-create the password and key I had before? If so, what do I choose and why? The options I have are as follows; PGP Stored password Password keyring Secure shell key The first and last option seem to be obvious and I have no idea about the differences between the second and third options. Why do I need a stored password or password keyring in all scenarios and not just the wireless issue I ran into? EDIT 0 Further to Belisama's comment, I have amended my question. EDIT 1 As requested, I have attached a screenshot

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• Linux (Ubuntu 12.04) two gateways one nic

  - by David

  I have Ubuntu 12.04 Server edition Two gateways, both on 192.168.0. network, let's make them 192.168.0.1 and 192.168.0.2 I've read you should be able to add second gateway into /etc/network/interfaces, that it will build out all the routing automatically, but I get "duplicate option" error. So if I have one default gateway, let's say 0.1, and a connection comes through from the 0.2 gateway, my understanding is that it still tries to respond through 0.1 gateway. Can we change this behavior?

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• Change default DNS server in Arch Linux

  - by AntoineG

  I'm in Viet Nam and most social websites (Facebook, Twitter and the likes - even reddit) are blocked by the ISP DNS server. I tried to change the DNS server of my Arch box using the resolv.conf file, but it failed miserably since dhcpd generates this file automatically everytime I connect to the LAN. I've been looking around to try and find out how to fix this, without success. Either I s*ck at Googling, either it is non-trivial to do so. EDIT 1: Meh, apparently posting it here made me feel guilty and I had to push my search a bit more. I found the same article than Ankur post below. This is what I made, if anybody ever faces the same problem: $ sudo gvim /etc/dhcpcd.conf Add "nohook resolv.conf" at the tail of the file. $ sudo gvim /etc/resolv.conf Add to the file (OpenDNS servers): nameserver 208.67.222.222 nameserver 208.67.220.220 Or (Google DNS): nameserver 8.8.8.8 nameserver 8.8.4.4 Then, verify it worked (need package dnsutils): $ dig www.facebook.com ; <<>> DiG 9.9.1-P1 <<>> www.facebook.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16994 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;www.facebook.com. IN A ;; ANSWER SECTION: www.facebook.com. 89 IN A 69.171.224.53 ;; Query time: 87 msec ;; SERVER: 208.67.222.222#53(208.67.222.222) ;; WHEN: Thu Jun 28 00:43:23 2012 ;; MSG SIZE rcvd: 61 See ;; SERVER: 208.67.222.222#53(208.67.222.222), it worked.

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• Good Linux Distro for Disconnected Netbook

  - by MrWizard54

  I'm deployed to Afghanistan with the Army and I have a friend who's netbook had his hard drive take a dump on him. He ordered a new hard drive and I was able to download and burn a copy of Ubuntu to disk from work. However the default install doesn't support most of the media that he wants to watch (AVI files, probably some DIVX video) without installing extra packages. We don't have internet in the tent and really don't have a vaiable option for downloading additional packages through the package manager anywhere here. The computer is a small HP netbook. All my friend wants is to watch ripped movies. Does anyone know of a good way to do either of the following: Download packages seperately and install them via CD A distro that is going to come preloaded with all of the packages and needed to watch just about any type of video file you can think of? Thanks in advance, Andy

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• Running psql in Linux Command Line

  - by Mr Shoubs

  I've just installed Postgres9 and it is up and running without any issues. There is one thing however that is confusing me: If I type /usr/local/pgsql/bin/psql test then postgres command line loads and I can use it as expected, however... If I cd /usr/local/pgsql/bin then type psql test I get the following error: The program 'psql' is currently not installed. To run 'psql' please ask your administrator to install the package 'postgresql-client-common' Does anyone know why? (please don't say install postgresql-client-common as this doesn't solve the problem)

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