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• Move and clone VirtualBox machines with filesystem commands

  - by mit

  I know of 2 ways to clone a VirtualBox machine on a linux host, one is by using the VirtualBox gui and exporting and re-importing as Appliance (in the file menu of VirtualBox). The other is by cloning only the virtual disk containers: VBoxManage clonevdi source.vdi target.vdi (Taken from http://forums.virtualbox.org/viewtopic.php?p=853#p858 ) I would have to create a new VM afterwards and use the cloned virtual disk. Is there a way I can just copy a virtual disk and the and do the rest by hand? I'd have to manually edit the ~/VirtualBox/VirtualBox.xml and insert a new disk and a new machine: Can I just make up UUIDs or how would this work? I would very much prefer this hardcore method of doing things as it allows me to freely and rapdily backup, restore, move or clone machines. Or ist there a better way to do this?

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• Is GPU active when there are not any monitors?

  - by Mixer

  Does GPU render anything when there is no monitor plugged in? Today I turned my old PC into some kind of a "server" which means that I want it running 24/7. I don't need any display (I will operate through ssh) so when everything was set up I removed my monitor. After a hour I checked my graphic card's cooling system and it was still hot. My graphic card is GeForce 8600 (with DVI connector), OS is Debian Linux. What is the best solution in this situation (standalone server) if GPU is active and I don't want it to waste power?

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• Does /boot safe on top of a lvm LV (logical volume)?

  - by fantoman

  Title already asked the question. More specifically, I read in some documents that logical volumes are nice in general but not for /boot in a linux system. They say that bootloaders don't understand LVM volumes, so create a separate partition for /boot out of lvm. I recently installed Ubuntu server (9.10) for my home server, but by default /boot is created in the LVM. Everything is fine now, but I am not sure it is safe to use /boot in LVM. Second question is do I really need a physical partition (volume)(pv) for /boot or is it equally fine if I put it into a logical volume (lv) on top of a single shared volume group. Thanks in advance.

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• X11 forwarding through SSH

  - by martinjlowm

  I have been playing around with X11 forwarding the past few hours and so far I've managed to forward my desktop pc's X Server to my laptop, using X11VNC as server and X2VNC as client. X2VNC uses Xinerama to provide a dual-screen-like behavior between my laptop and my desktop pc. It's actually really great! I know that most Linux systems run Xorg and desktop environments on TTY7. Therefore I was thinking, is it in any way possible to have the VNC-tunnel tied to it's own TTY? It would be great to be able to switch forth and back between two TTY's in order to choose which machine to manage. And I would like this approach more than using Xinerama or a GUI.

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• ASUS N550 laptop not charging on ubuntu after updating kernel

  - by OBY Trance

  I'm using Ubuntu 13.10 on a pretty new ASUS N550jv laptop. When I was using kernel linux-image-3.11.0-11 everything was quite well (kinda..), however, when I updated the kernel using the automatic update, the kernels which were released afterwards (12+) were faulty on my machine, and caused the battery not to be charged and only stay at their current charging level (even when the machine was off!) The only fix I had was to roll-back to the '..11' version (on boot screen - advanced options), and hard-reboot (AC cord disconnected and reconnected) but now version 14 was released and "pushed away" the good old version 11. How can I fix that?? Please help me...

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• Video streaming over multi display units

  - by ramdaz

  We have to share video across around 4/8 terminals at a public facility where we need to display live video from within the facility, as well as display messages(advertisements), and also play videos(not live) which need to be controlled centrally from another location. We can do central location handling over Internet, over ssh. What we want to do is connect cameras to a computer, and use the computer to display over multiple display units. We need to do live titling if possible. Once the live local telecast which usually takes about an hour or two a day, we would like to play other videos locally off the PC server. Preferably everything should run off Linux, since budgets are very constrained.... Addendum -- Its not over WAN, it's over a local area. I prefer not using LAN, we would rather use co-axial cable if possible. The reason is if it's LAN, I need some kind of an Networking device, at least a thin client

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• Debian can't see one of my hard drives

  - by nask00s

  Today I installed Linux Debian in dual boot with Windows 7. I have 3 hard drives, two for starage and one for the operating systems. The problem is with the two storage drives which are exactly same. In debian I can only see one of them. Before Debian I had Ubuntu and there wasn't any problem. Also I didn't changed anything from that drive. What should I do? I don't want to format it or delete anything.

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• How to forward traffic using iptables rules?

  - by ProbablePattern

  I am new to iptables and I have been doing Google searches for a few days now without finding a good solution to this problem. I have computer A with a public ip address (say 192.0.2.1) that can access the Internet unrestricted. I have another computer B with a private ip address (192.168.1.1) that can only access computer A. How do I use iptables to forward network traffic from B through A to the Internet? I need to use http, ftp, and https in order to use apt-get with sudo. Both computers run Ubuntu linux. I have tried using Squid but I think it is far too complicated for what I need to do.

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• Ctrl-Alt-F1 never gives prompt

  - by nispio

  When I press Ctrl+Alt+F1 in my Red Hat Enterprise Linux 6.4 (Santiago) I get a black screen with a blinking cursor, but I never get a login prompt. I can get back to my desktop with Ctrl+Alt+F7, and things work as normal. However, when I run sudo init 3 I get the same thing, but this time I am stuck at the screen and can't get back without a reboot. I'm not even sure where to start looking for the cause of this problem. Are the startup scripts that might be causing the problem or other system configurations that could lead to this? If this is not an known issue, what steps should I take to debug?

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• What are the methods of separating network spaces in a LAN?

  - by dash17291

  Please detail me the methods. My thoughts: put the servers in separate (sub)networks the servers are forced to go through the firewall but no NAT is required assign more IP addresses to the internal interface of the server choosing gateway addresses from the clients and servers IP address ranges split DNS Netfilter/{iptables, ipset} could be heavily involved, I'm talking about Linux servers. See for example: Destination NAT Onto the Same Network from internal clients Please do not explain what is NAT or DNS. This is a theoretical question, but my poor English knowledge prevent me to describe it in a fancy fashion.

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• Doing "text mode 'splash' game" during boot.

  - by Vi

  Sometimes I want to do something (for example, playing a simple text-mode game) while the system is booting up. This is especially useful when lengthy reiserfs transaction replays are happening. Current hacky way of doing it is: Put the program on initramfs. Before running /sbin/init, "openvt 2 /my/program". Turn off messages from kernel (sysrq 0) Override /dev/console with /dev/null (to prevent boot messages). The problems are: There are STILL some messages interfering with program output. I can't see boot messages by switching to that virtual terminal back. After finishing the boot sequence, /dev/tty2 ends up being attached both to getty and my program. How to do it properly without of running graphical splashes? The system is Linux Debian Squeeze, no dependency based sysv scripts.

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• Running Debian as a Virtual Machine Host

  - by Tone

  I have a need to run a linux server to host subversion, bugzilla over Apache and also act as a file and print server. I also have a need to host Windows Server 2008 virtual machines for development purposes (I'm a .NET guy). The machine I have is a dual core AMD 2.5 Ghz w/2GB RAM. So here are my questions: 1) Should I run Debian (or some other distro) as the base AND create a Debian VM to host subversion, bugzilla and be my file/print server? or is it ok to use Debian as both my VM host and for those other reasons? 2) VMWare has a free server edition, Virtual Box also is another free option. Which one of these is better suited for what I need to do? Are there any other free (or inexpensive) alternatives out there? 3) Will I need a GUI with Debian in order to manage my VMs? 4) Can I run VMs without a GUI to conserve system resources?

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• Missing kernel on debian-testing-amd64-DVD-1

  - by Kyrol

  I want to install the Debian testing linux version. But at a certain point of the installation, an error occurs: Impossible to install kernel. a compatible kernel version is missing... … or something like that. I see that the image ISO of the DVD is less than 4GB, but is impossible that there is no compatible kernel version for the system. I have an Asus X53Sc with Intel core I7-2630QM, Geforce GT 520MX.

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• df -h overreports disk space on VPS

  - by Rincewind42

  When I run the command df -h on my new Ubuntu linux vServer I get the following: # df -h Filesystem Size Used Avail Use% Mounted on /dev/hdv1 466G 33G 434G 7% / none 16M 0 16M 0% /tmp Running du -sh gives # du -sh du: cannot access `./proc/13624/task/13624/fd/4': No such file or directory du: cannot access `./proc/13624/task/13624/fdinfo/4': No such file or directory du: cannot access `./proc/13624/fd/4': No such file or directory du: cannot access `./proc/13624/fdinfo/4': No such file or directory 952M . The VPS should only have 5Gb of disk space but df reports 466Gb. How can I view the correct amount of disk space?

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• syslog facilities

  - by user65971

  Hi, I have an application (in java) running in a windows PC and I want to send logging messages to a syslog server running in a linux box somewhere in the network. The problem I have is, that it is not clear to me what should I use as facility in this case. I.e. can I (/should I) send the logging info as one of LOCAL0-LOCAL7? Or are they not supposed to be used by remote applications? It is not clear to me if they are usable or not. Should I use USER instead? Could anyone help me on this please? Thank you

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• Wifi and eth behavior

  - by r00ster

  I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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• Boot Loop contiues [closed]

  - by user1894750

  I am facing boot loop. My backend Linux works flawlessly, But the Zygote and System server does not workout. I can still use ADB and LIVE cat .. ps show that both Zygote and system_server process are there, But boot animation remains forever !! I have : 1 Wiped Data + Cache Partition 2 System Partition has been RESTORED.. There is NO PERMISSION problem... I think that there is *problem with Zygote and System_server ..* my device: Karbonn A9+ Dual Core Snap Dragon 1.2 Ghz Ram 386MB OS : ICS 4.04 Any suggestions ??

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• PHP CPU utilization limit

  - by knightrider

  I have done some research on the net regarding the problem. My questions is NOT how to reduce cpu utilization by improving algorithm or improving the performance by using multitasking or limiting CPU per system user. I have a website where user logs in does some processing and logout. The site uses linux server, php and apache. The problem is that I cant control the amount of CPU allocated to each user. ie I want give a guarantee that a user will get say atleast 5% of CPU (assume total number of users is less than 20). How can I do this? Any solution (A php code, apache server settings, or any out of box soln) is welcomed. Thankyou very much for reading this :)

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• Entries in `/etc/inittab` below last line - possible hack? [closed]

  - by Danijel

  Possible Duplicate: My server's been hacked EMERGENCY My Linux machine has been hacked lately. There are a few entires in /etc/inittab below the #end of /etc/inittab Something like: #Loading standard ttys 0:2345:once:/usr/sbin/ttyload I also have serveral of the following lines: 2:2345:respawn:/sbin/mingetty tty2 3:2345:respawn:/sbin/mingetty tty3 . . . I know that my /usr/sbin/ttyload has been hacked, and I have removed it, but I don't know if I need this is inittab, nor whether I had ttyload before. Is this file common? Should I remove this line?

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• Run command on init and restart on errors

  - by chersanya

  I have internet access on my PC through proxy through SSH, so every time I need to execute ssh -L PORT:SERVER:PORT LOGIN@SERVER and then type a password. After each network failure or reconnect this command has to be executed again. I've got bored of it and look for a way to do this automatically: first run this after boot (it doesn't seem to be a problem - put this command in some init file and that's all) and then rerun it (if possible, then type password) on each network failure. Is it possible, and how? OS Linux (Debian)

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• Oracle met à jour le site Java.net avec un nouveau design et des outils supplémentaires pour les développeurs

  Oracle met à jour le site Java.net Avec un nouveau design et des outils pour les développeurs Java.net, le site communautaire d'hébergement des projets Java, vient d'être mis à jour par Oracle. Le site a été déplacé sur les serveurs d'Oracle et utilise désormais les infrastructures du projet Kenai (site communautaire hébergeant des projets Java qui avait été migré sur Java.net par Oracle l'an dernier) afin d'offrir une plus grande flexibilité aux développeurs qui veulent contribuer ou faire héberger leurs projets communautaires. Tous les services proposés par Java.net sont maintenus. De nouveaux outils ont été intégrés : « nous allons continuer à offrir un bon mélange de blogs,...

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• Building MySQL with boost on windows

  - by user13177919

  As you've probably heard already MySQL needs boost to build. However, in the good ol' MySQL tradition, the above link does give you only the instructions on how to build it on linux. And completely ignores the fact that there're other OSes too that people develop on. To fill in that gap, I've compiled a small step by step guide on how to do it on windows. Note that I always, as a principle, build out-of-source. The typical setup I have is : bzr clone lp:~mysql/mysql-server/5.7 mysql-trunkcd mysql-trunkmkdir bldcd bldcmake -DWITH_DEBUG=1 -DMYSQL_PROJECT_NAME=mysql-trunk ..devenv /build debug mysql-trunk.sln This has been tested to work on a 32 bit compile using VS2013 on a Windows7 64 bit build. Note that you'll need other things too (bison, eventually openssl etc) that I will assume you already have set up. Steps: Download Boost 1.55.0. It's the *only* version that is known to work currently. Extract boost_1_55_0/ from the zip to c:\boost\boost_1_55_0 Go to Control Panel/System/Environment variables and set WITH_BOOST=C:\boost\boost_1_55_0 in User variables. Make sure you restart your open command line terminal windows after this !  If you're upgrading from non-boost build, remove your bld/ directory and create a new one. run cmake as you'd typically do. You should get: -- Local boost dir C:/boost/boost_1_55_0 -- Local boost zip LOCAL_BOOST_ZIP-NOTFOUND -- BOOST_VERSION_NUMBER is #define BOOST_VERSION 105500 -- BOOST_INCLUDE_DIR C:/boost/boost_1_55_0 Build as normal (devenv /build debug ...). It should work.

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• Where's my tab completion and up-arrow behavior? (Ubuntu 10.04)

  - by pastorius

  I'm new to Linux, trying Ubuntu 10.04, preconfigured by host. When I log in (SSH) using the preconfigured account, the shell prompt is: user@hostname:~$ The up arrow scrolls through the list of recent shell commands, and tab-completion works as expected. However, when I create an account and log in (SSH) using that account, the shell prompt is simply "$", and the up arrow just prints a control character (^[[A). Can anyone tell me how to get my prompt, tab-completion, and up-arrow behavior set up? The fact that I'm getting control characters when I up-arrow makes me think that my account (or session) is in some mode I'm unfamiliar with. I know there is tab-completion code stored in bashrc that I can uncomment, but that doesn't seem to have any effect, even after logging out and logging back in. Am I in some strange mode when I SSH in with the new account, or are there just some session/account settings I need to set up, and can find information for anywhere on the Internet if I just knew what to look for?

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• adding ftp user on ubuntu

  - by user46250

  I followed this tut http://www.trainsignal.com/blog/how-to-set-up-safe-ftp-in-linux to setup an ftp server with user account sudo mkdir -p /home/ftp/ftpuser sudo useradd ftpuser -d /home/ftp/ftpuser -s /bin/false sudo passwd ftpuser when I tried to connect with login ftpuser remotely it didn't work. It didn't work even with root UNLESS I removed root from ftpusers. I am confused ftpusers are the users NOT allowed to do ftp ? Where are the list of users allowed then and why can't I connect with ftpuser I created ?

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• Java and Sendmail HELO requires domain address

  - by ealgestorm

  I am trying to set up emailing from a java web application hosted on a linux server (Cent OS) in apache. Sendmail is working fine from the command line as root on localhost but when trying to send emails from the java web app (also on the same server from localhost) the following java exception is thrown. 501 5.0.0 HELO requires domain address EDIT: I have read that some people have found this is due to an incorrect hosts entry currently the hosts file contains 127.0.0.1 Centos-VPS localhost.localdomain localhost and i'm not sure what the Centos-VPS bit at the start is for but this is a clients hosted server so don't really want to break stuff EDIT see the RFC is helpful ... 501 Syntax error in parameters or arguments Now I know what the problem is! (note the sarcasm people.)

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