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• Run VirtualBox in background, without a window

  - by Bashman

  Hi! I was wandering if it's possible to run an Ubuntu virtual machine using VirtualBox in background, I mean, without any window open. The idea is to conect via SSH to the linux host, that would be running in background. Have you ever done somenthing like this? Is it possible? Thanks!

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• Configure options MySQL server was compiled with??

  - by GetFree

  I have MySQL server 5.0.67 running on a Linux machine. How can I know what configure options were used to compile it?? I'm interested in the option --with-mysqld-ldflags in order to know whether mysql was linked statically or dynamically. Thanks.

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• Zip only public directory

  - by Nino55

  Hi guys, I've a lot of websites (100+ directories) I want to create a unique zip with only public subdirectory. My structure now is like: - Site 1 --- app --- tmp --- log --- public - Site 2 --- app --- tmp --- log --- public - ... 100+ dirs ... Now I need a unique zip and then after unzip it I want to see this structure: - Site 1 --- public - Site 2 --- public - others Any suggestion how I can do that with linux commands zip/tar ? Thanks so much!

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• How to approach taking a very diverse hybrid network and making something lean and cohesive

  - by Gregg Leventhal

  I am going to have an opportunity (from the role of Linux Sysadmin) to work on optimizing a corporate server network that has a lot of different application servers from LAMP stacks to JBOSS to IIS based ASP/.NET systems of all sorts. I am interested to hear how you would approach evaluating and consolidating a network in a situation like this where you are walking in cold? What are some of your go-to techniques?

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• How to send mail to my mailing list

  - by xrobot

  I have a landing page to collect email from person interested in my event. So now I don't know how can I send email to this mailing list ( there are about 5000 email and is growing 10-20 per day ). Could you help me ? P.S. I use LINUX

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• Using dd command and running out of space while cloning drive to img

  - by Alan Kuras

  I have a problem with drive cloning. Im using dd on damaged disk with bad sectors trying to make an image from it. Im booting computer with Live Linux CD . Damaged disk: sda 146GB (NTFS) External drive: sdb 300GB (NTFS) After running the command below im running out of space on disk sdb. dd if=/dev/sda of=/dev/sdb/hdd.img bs=4096 conv=noerror,sync The question is why im running out of space on disk sdb ?

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• Setting a non-standard proxy

  - by Julio Guerra

  I am behind a proxy which requires users to login during the first connection with a username and password with a HTML form. Thus, it is not handled with usual http://username:[email protected] and any attempt to access the internet from this setting falls into the login form. How could I automatically login to the proxy? In linux, what manages proxy stuffs when a command tries to access the internet? Thank you.

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• Poor performance of single processor 32bit Windows XP xompared SMP in VBA+Excel

  - by Adam Ryczkowski

  Welcome! On many computers I experienced poor performance of 32 bit guests running on 64 bit Linux host (I used only the Debian family). At last I managed to collect benchmark data. I made the benchmark by running custom VBA macro, (which we use in our company) that generates 284 pages long Word document full of Excel Pie charts, tables and comments. The macro is run as a single task (excluding the standard services) on a set of identically configured Windows XP 32-bit systems. I measured the time (in sec.) needed to perform the test. The computer (i.e. my notebook Asus P53E) supports both VT-d extensions and native Windows XP. It has 2-core processor, each core is hyperthreaded, so in total we have 4 mostly independent execution units. I use the latest VirtualBox 4.2 and VMWare Workstation 9.0 for Linux, installed together on the same host (running Mint 13 Maya) but never run simultaneously. The results (in column Time) are no less accurate than ± 10% Here are the results (sorry for the format, but I couldn't find out a better solution for tables in SO): +---------------+-------------+------------------------------------------------------+---------+------------+----------------+------+ | Host software | # processor | Windows kernel | IO APIC | VT-x/AMD-V | 2D Video Accel | Time | +---------------+-------------+------------------------------------------------------+---------+------------+----------------+------+ | VirtualBox | 1 | Advanced Configuration and Power Interface (ACPI) PC | 0 | 1 | 0 | 1139 | | VirtualBox | 1 | Advanced Configuration and Power Interface (ACPI) PC | 0 | 1 | 1 | 1050 | | VirtualBox | 1 | Advanced Configuration and Power Interface (ACPI) PC | 0 | 0 | 1 | 1644 | | VirtualBox | 4 | ACPI Multiprocessor PC | 1 | 1 | 1 | 6809 | | VMWare | 1 | ACPI Uniprocessor PC | | 1 | 1 | 1175 | | VMWare | 4 | ACPI Multiprocessor PC | | 1 | 1 | 3412 | | Native | 4 | ACPI Multiprocessor PC | | | | 1693 | | Native | 1 | Advanced Configuration and Power Interface (ACPI) PC | | | | 1170 | +---------------+-------------+------------------------------------------------------+---------+------------+----------------+------+ Here are the striking conclusions: Although I've read in the VirtualBox fora about abysmal performance with 32-bit guest on 64-bit host, VMWare also has problems compared to native run, still being twice faster(!) than VBox. Although VBA is inherently single-threaded, the Excel calculations, which take much more than a half of total computation time, supposedly aren't. So one would expect some speed gain when running on 2+ cores ("+" for hyperthreading). What we see is a speed loss. And quite big one too. For the VirtualBox the VT-d extension isn't a big deal. Can anyone shed some light on why the singlethreaded Windows kernel is so much faster than the SMP one?

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• Use the ASUS Express Gate Button to boot an other Operating System

  - by Ruby

  I have a ASUS U50AG Notebook, with a normal Power On and an Express Gate Power On Button. Now i will install a Windows and a Linux. To start one of the OS i will use one of the Button. Und use no Boot Manager. How can i do that?

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• Cannot move folder to a subdirectoy of itself - What's going on?

  - by calumbrodie

  O.K I am trying to do the following very simple command and it is failing as follows... mv '/home/admin/Downloads/folder1' '/home/admin/MyLibrary/MyVideos/TV/folder1/' mv: cannot move `/home/admin/Downloads/folder1' to a subdirectory of itself, `/home/admin/MyLibrary/MyVideos/TV/folder1/' The destination is NOT a subfolder of the source - why is it giving me this error?? Linux version is a custom version of Red Hat on a NAS box. Thanks

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• How to secure adhoc networks

  - by moshroum1

  What is the right way to secure adhoc networks? WPA_NONE is a cruel hack (doesn’t work most of the time, discards important packets, ..), WEP is not secure and Open… open is open. IPSec is a level to high. Does there exists something which works under linux and wifi?

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• How to fix grub after moving root partition?

  - by Grzenio

  Hi, Because I am using one of the new WD disks I am trying to aling my root partition with the real sectors, as described here: http://community.wdc.com/t5/Desktop/Problem-with-WD-Advanced-Format-drive-in-LINUX-WD15EARS/m-p/10920#M631 So I copied all files to a temp location, deleted my partition (/dev/sda3), recreated it a few cylinders later (same name) and copied the files to the newly created partition. But now when I try to boot, I get my old grub menu but after selecting my kernel version it hangs... Any idea how I can fix it?

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• ssh sessions in xterms freeze for many minutes whenever they disconnect

  - by dreeves

  If I ssh to a remote machine and then lose internet connectivity, the session freezes. I can't control-c or otherwise abort and go back to my local xterm or terminal prompt but if I wait several minutes it will do so. There must be some way to force it to abort the remote ssh session when connectivity is lost. I'm on a Mac but I believe this happens on cygwin or linux as well.

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• Faking the date for a specific shell session

  - by Julien Nicoulaud

  I'm certainly trying to achieve something weird here, but I want to fake the date locally for a shell session on GNU/Linux. I need to black-box test how a program behaves at different dates, and modifying the system-wide date can have unwanted side effects (cron jobs, messed up logs, etc). Any ideas ?

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) exist out there that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly.

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• How to set up an apt repository?

  - by George Edison

  I am interested in setting up an apt repository on my server to host some of my packages. How would I go about doing this? It's a shared server. Basically, I want to do what Google did in regards to the way they host Chrome downloads for Linux.

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• Operative systems on SD cards

  - by HisDudeness

  I was getting some wild ideas the last days, like putting some operative systems into SD cards rather than on my hard drive. I'll go further into details now and explain what lead me to consider this probably abominable decision. I am on a laptop (that means I have a native SD-card reader) which is currently running a cross-distro setup, with a bunch of Linux systems (placed in dedicated ext4 logical partitions into a huge extended one) regulated by an unique GRUB. Since today, my laptop haven't even seen any Windows system with binoculars. I was thinking about placing all the os part of my setup into a Secure Digital to save all my 500 Gb Hard Drive for documents, music, videos and so on, and being able to just remove the SD and boot my system into another computer too, as well as having the possibility of booting other systems into mine by just plugging in another SD, without having to keep it constantly placed in my PC. Also, in the remote case in the near future I just wanted to boot Windows 8 in it, I read it causes major boot incompatibility issues with other systems by needing a digital signature in order for them to start. By having it in a removable drive, I could just get rid of it when I'm needing him and switch its card with Linux one, and so not having any obstacles to their boot. Now, my questions are: I know unlikely traditional rotating disk drives, integrated circuits ones have a limited lifespan in terms of cluster rewriting. Is it an obstacle to that kind of usage? I mean, some Ultrabooks are using SSD now, is it the same issue, or there are some differences between Solid State Drives and Secure Digitals in that sense? Maybe having them to store system files which are in fixed positions (making the even-usage of cluster technology useless) constantly being re-read and updated and similar things just gets them soon unserviceable, do it? Second question: are all motherboards and BIOSes able to boot from SDs just like they are from USB pen drives (I mean, provided card reader is USB-connected, isn't it)? Or can't bootloaders like GRUB be installed on SDs working? If they can't, is it a solution installing GRUB to MBR and making boot option pointing to SD? Will it work? Are there any other problems to installing OSs on a Secure Digital?

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• Anyone know how to get dual screens working on a Dell E6410 laptop with Ubuntu 10.04 64 bit?

  - by Curtis

  I've installed the drivers from nVidia. When I go into the NVIDIA X Server Settings application, in the X Server Display Configuration setcion, and click the "Configure" button, "TwinView" is disabled. Also, clicking "Detect Displays" doesn't pick up my monitor (which is connected through a port replicator - keyboard and mouse in that port replicator work fine). Has anyone else seen this? Is this just a limitation of the current nvidia linux drivers?

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• Command-line video concatenation and recompression?

  - by Alex R

  What is the best CLI tool (preferably Linux based) that will allow concatenating video files, and also compressing them on the client-side for YouTube upload? Thanks

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• How do I change a VMWare 1.x server's guest boot order?

  - by bo gusman

  I have 4 VMs on a Linux host, call them A, B, C, D running on Z. I really don't care when A and B come up, but I would like to make sure that D comes up before C. I believe that in VMWare 2.x it's possible to change the boot order. Is this possible in 1.x as well? Is this done in /etc/vmware/vm-list? I see that there are a number of VMs listed there, including some that have long since been deleted.

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• Grub problem with dual boot Ubuntu & XP (Ubuntu installed first)

  - by c00lryguy

  I had Ubuntu installed and I installed XP. I tried to be able to dual boot them by running an Ubuntu live cd and running ~ $ sudo grub grub> root (hd0,0) grub> setup (hd0) But now when I restart I get a black screen that says 'Boot device Selected Boot Device and press any key No matter what key I press it shows this error This is what my system looks like: /dev/sda1 - Ubuntu - ext3 - 73 GiB /dev/sda2 - Ubuntu - extended - 3.16 GiB /dev/sda5 - Ubuntu - linux-swap - 3.16 GiB /dev/sdb1 - Windows XP - ntfs - 76 GiB /dev/sdc1 - Stuff - ext3 - Code/Documents /dev/sdd2 - Stuff - ext3 - Movies/Music

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• Manually closing a port from commandline

  - by codingfreak

  Hi I want to close an open port which is in listening mode between my client and server application. Is there any manual command line option in Linux to close a port ?? NOTE: I came to know that "only the application which owns the connected socket should close it, which will happen when the application terminates." I dont understand why it is only possible by the application which opens it ... But still eager to know if there is any another way to do it ??

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• clone of tseng et4000 extended mode font?

  - by Jason Yanowitz

  Back in the day (day =~ 1994), the tseng et4000 video card had extended modes for the console under linux. There was a beautiful monospaced font (I think it was for 100x40 or 100x50, but my memory could be wrong). Anyone know a way to get said font for a modern computer (e.g., Mac OS X) or the history of the font, etc? http://en.wikipedia.org/wiki/Tseng_ET4000 has little info on this score.

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• how to setup OpenSSH per-user authentication types?

  - by Seaweed

  Hi - I'd like to be able to have one set of users authenticating using public key auth and the other set to use username/password. Is this possible in OpenSSH on Linux? If so how do I go about it? Right now, I'm stuck with only having one option as far as I can see in /et/ssh/sshd_config - it's either PAM or PublicKey authentication...

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• Reading line for Ubuntu users

  - by Willy Levine

  Normally when I read a book I use a bookmark held horizontally under the current line I'm reading to help me keep my eyes on the right spot. When I read a PDF or other document on my computer I would like to be able to do the same thing, only with a line on the screen controlled by the up and down arrow keys. Any suggestions for an application which would do this? I'm a Ubuntu Linux user.

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