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• USB webcam detected in KVM, but doesn't work

  - by Gene Vincent

  I have installed XP in a virtual machine running on Linux with QEMU/KVM (qemu-kvm-0.11.0-4.5.2). I export my Linux webcam to KVM using the switches "-usb -usbdevice host:046d:0929". The XP guest sees the webcam and the drivers install, but the camera only shows a black image. When I open the camera in Windows Explorer, it says "0 images" and a black image, while on a real XP, it says "1 image" and shows the video from the camera. I tried the same with a different webcam, but the result is the same. Any ideas what might be wrong or how I could debug this ?

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• Couldn't start mysql service in linux

  - by Haseena

  Iam trying to install one version of mysql in a LINUX machine. The system contain already another version of mysql installation. I prefer manual installation. Copy the exctracted tarball into a location and create symbolic link to that. I wish to install my mysql version without affecting already installed mysql version in the system. I created mysqld as service. But It couldn't start. When Iam trying to start this mysqld process, it shows an error like: Starting MySQL............................................................ ......................................... ERROR! The server quit without updating PID file (/var/lib/mysql/Test.pid). Please help me, is any wrong with my installation??? I follow the below mentioned link for installion : http://code.openark.org/blog/mysql/manually-installing-multiple-mysql-instances-on-linux-howto Thanks in Advance

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• Correct architecture for running and stopping complex tasks in the background

  - by Phonon

  I'm having trouble working out the correct architecture for the following task. I have a GUI in Windows Forms that contains a ListBox, listing certain architectural layouts. One an item in this list is selected, a custom Control displays an interactive visualization of the selected layout. Drawing of this interactive diagram is a CPU-intensive task, and can take up to a second on my machine. The kind of functionality I'm trying to achieve is that if a user wants to quickly scroll through the layouts in the ListBox (say, holding down the down arrow key), I don't want my computer to sit there thinking about how to draw the layout before it allows the user to do anything else. The obvious answer is, of course, to run the layout calculations in a separate thread. But how do I make that thread return a whole control? How do I make sure I'm not running two layout calculations at once? I'm fairly new to this complex GUI business. So the real question is what is the right architecture to implement something like this? This seems like something people do all the time, but finding any suggestions on how to do it properly is really difficult.

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• How can I stop a process from moving to the background?

  - by Alex

  I have a machine running Ubuntu server version 12.04.3 LTS. On it, I'm attempting to run a node.js server that needs to stay up and running at all times. I'm running into an issue, however, where periodically I see this happen: [1]+ Stopped sudo node server.js When this happens, I have to manually bring it back with fg, which works fine, at least until it stops again. As far as I can tell, it isn't functioning properly while stopped, since I get no log files in those windows of time. So my question is this: Is there a way to prevent it from being stopped like that? I'm running it in a tmux window, if that changes anything. Also, to address the question before it gets asked: I'm running it as sudo due to some ecryptfs issues I've been having. I was originally running it in my home directory, but when it was left alive for too long things would get out of sync and the file writes it has to do would just stop working. To mitigate that, I moved it out of my home directory, but its new location requires me to use sudo permissions for everything to work correctly. Hopefully that isn't related to the whole background task thing. (sudo and tmux tags included in case one or both turn out to actually be relevant to the solution.)

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• how to master in Windows administration [closed]

  - by Mateusz

  what is, in your opinion, best way to become real Windows, advanced administrator? Of course it's possible to obtain MS Certificates, but they're rather very expensive. Almost two years of everyday working on Linux machine, teach me, that it's very important to read system logs. Anyway, I assume that it's enough - I think that you must be familiar with almost any hive in you registry and each trick in Windows CMD and VBS- although it's high time for PowerShell, still on many maschines, you have only an opprotunity of using CMD by default (and their owners are reluctant to install anything else). How I can accomplish this task? Which groups follows (superUser - it' obligatory), which articles read?

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• HP Media Smart remote access

  - by Coov

  I just purchased this box for home backups for my pc's and mac's. Everything works great accept for the remote access part. I can RD into the machine locally but I can't get to it from outside of my network. I've enabled port forwarding on my router but it doesn't seem to matter. I checked with Qwest and they don't block these ports so I'm at a loss. I do have Vonage in front of my router but I've taken it out and it didn't make a difference. I suspect I've made an error with my router setup. I'm a programmer and I'm playing in the world of the unknown here. I'm lost. Any suggestions?

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• Does laser printer use toner when switched on/off?

  - by Alan Harris-Reid

  I have recently purchased a HP LaserJet M175nw laser printer which goes into sleep-mode after 10 minutes of non-use. I know sleep-mode uses a very small amount of power, but the flashing light on the control panel is driving me nuts! I know I can turn-off the printer via. the on/off button, but when it is turned-on manually, there is some whirring sound which I guess might be the machine warming-up. My question is... Is any toner used during this warm-up (or cleaning) cycle? Am I better-off keeping the printer in sleep mode, or is it ok to turn off manually? TIA Alan

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• Cisco Aironet 1200 Series AP Configuration

  - by nonterrorist

  I am attempting to configure a new CISCO Aironet 1200 Series Access Point to have a fixed IP. I have been searching online and I have come to the conclusion that the default IP address of this device is 10.0.0.1. These are the steps I have taken: My machine is plugged directly into the Ethernet port (not the Console port) of the AP. My Ethernet adapter is set to 10.0.0.2. I have reset the AP by holding the Mode button while powering up the device. The issue remains that I can not access 10.0.0.1 through the web, nor can I ping that address.

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• Can't mount home after trying to resize (bad geometry: block count exceeds size of device).

  - by Lynn

  This is on a fresh computer (super computer actually). It got to me with 15T on the home mount and 50G on the root. I tried allocating 7T to root and resizing (since I'm putting a local yum repo on this machine as it has no internet access nor will it ever). I tried following the instructions here: Centos 6.3 disk space allocation but something went wrong and the home won't mount again. Instead I get from dmesg | tail: EXT4-fs (dm-2): bad geometry: block count 4294967295 exceeds size of device (1342177280 blocks) df -h nets this output: Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 7.0T 3.6G 6.6T 1% / tmpfs 190G 216K 190G 1% /dev/shm /dev/sda1 485M 38M 422M 9% /boot I didn't have any files on /dev/mapper/VolGroup-lv_home. Will simply running mke2fs fix it to be mountable? What sort of options should I run it with. I've never resized volumes before or used mke2fs. I don't want to make this mess worse.

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• What's up with tab order on my Mac?

  - by biged781

  So, I just got my first Mac. It is slick, and I feel like I don't know how to do anything, but overall it is a great machine. However, I am becoming frustrated with the tab order in most web pages. For example, this site. If I am composing a comment and press tab, focus is set to the address bar. I would like the focus to shift to the button next to the text area, but no luck. Also, I cannot seem to tab into combo boxes in form pages. What is going on here exactly? This happens in FireFox as well as Safari. I don't get why the tab order of a page would not be respected. Any help is appreciated.

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• Windows fails to restart on reboot

  - by daramarak

  We have many machines running windows xp embedded. The machines are configured to reboot if any problems should occur. But our problem now is that in some cases the machines seems to shut down, but never reboots again. The same machine might reboot fine in the next time we try. Does anyone have clue what the problem might be. Does anyone got some advice on how to debug this problem. Are there any logs that might contain valuable information? Recreating this problem is not done easily so elimination methods are not feasable.

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• How To Create An FTP User That Has Permission To EVERYTHING

  - by Serg

  I've spent the last two hours trying to create an FTP user so I can transfer some files over to my Wordpress blog folder. /var/www/sergiotapia.me I'm using vsftpd and Ubuntu 12.04 for my FTP server and I've read tons of documentation, none of which seem to work. I still cannot log in with the FTP user, let alone test if I even have the read/write file permissions. Can a Linux guru here, help me out with a small step by step? I'm comfortable with the terminal and nano, so that's not an issue - I'll SSH into my box. Just tell me what to do and what commands to run. Specifically, this user needs to have read and write access to the /var/ folder and anything within it. I want to have 1 user that can do whatever the heck he wants on my Ubuntu 12.04 VPS machine.

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• What determines the time to first ping response in an OS?

  - by Stuart Woodward

  When a server (say Windows, Linux) is rebooted, it will take some time to respond to ping. I'm assuming that the software firewall has to be up before pings will be returned as there might be a setting to disable ping responses. Everyone knows that Windows and Linux have have totally different architectures so lets treat them separately. The answer I'm looking for is "After XXX is running, pings will be returned." It would be helpful to know where in the boot order this is too. i.e. at the start or end. I ask because we get questions from a customer about why it takes so long to respond to ping after creating a Virtual Machine. I'm sure this is just an artefact of the OS boot behaviour.

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• Completely unable to install python2.7-dev

  - by gath

  Am totally stuck! Am unable completely to install python2.7-dev on my Ubuntu13.04. I have tried all the tricks mentioned on this site (askubuntu.com) and many other sites on the web but still nothing! Am running Ubuntu 13.04 64bit on a virtualbox, but every time I run sudo apt-get install python2.7-dev, I get the following error; python2.7-dev : Depends: python2.7 (= 2.7.3-0ubuntu3.5) but 2.7.4-2ubuntu3 is to be installed Depends: libpython2.7 (= 2.7.3-0ubuntu3.5) but 2.7.4-2ubuntu3 is to be installed Depends: libexpat1-dev but it is not going to be installed Depends: libssl-dev but it is not going to be installed E: Unable to correct problems, you have held broken packages. I've tried to do apt-get update, but still nothing! I've even tried installing Python2.7 from sources, but still nothing doing! Is there a single package with all the dependencies I can download, that can just install everything (Python2.7-dev) or is there another trick I can use to get the Python-dev headers installed on my machine. Hint: I've noticed when I run sudo apt-get update , somewhere along the updates I've seen some errors; ... Get:1 http://us.archive.ubuntu.com precise-updates Release.gpg [198 B] Ign http://us.archive.ubuntu.com raring Release Ign http://us.archive.ubuntu.com raring-updates Release Ign http://us.archive.ubuntu.com raring-backports Release Ign http://us.archive.ubuntu.com raring-security Release Get:2 http://us.archive.ubuntu.com precise-updates Release [98.7 kB] Err http://extras.ubuntu.com raring/main Sources 404 Not Found Err http://extras.ubuntu.com raring/main amd64 Packages 404 Not Found Err http://extras.ubuntu.com raring/main i386 Packages 404 Not Found Ign http://extras.ubuntu.com raring/main Translation-en_US Ign http://extras.ubuntu.com raring/main Translation-en ... On my precise-updates.list file is a single entry; deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted I don't know if that might help Help! Paul

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• Why does a Remote Desktop Redirected Printer Doc appear every time I connect to Windows Server 2003 SBS?

  - by Jim Dagg

  I've run into a weird, persistent issue regarding a remote desktop connection. Every time I successfully log into a server running Windows Server 2003 SBS, without taking any further action, after a few seconds a print job spontaneously appears on my machine, titled "Remote Desktop Redirected Printer Doc". The document is 4K, datatype RAW, processor "WinPrint". I've heard of people running into this issue before, but can't seem to hunt down a coherent solution. It's a minor annoyance, but I get annoyed when Windows complains about a print job that, as far as I know, came from nowhere. Any thoughts on why this would occur and how I could prevent it from happening?

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• How to synchronize users, passwords, hosts, etc without NIS

  - by joshxdr

  I am administering a very small solaris 2.6 network with 4 boxes total. Is it possible to use scp or similar to replace NIS for synchronizing users, groups, hosts, etc? This network is only a small part of my job and I don't want to spend too much time on it, and I am worried the setup and maintenence of NIS will not pay off. I need it to behave like a proper multi-user system, when a user logs into any machine, the users, passwords, hosts, etc. are always the same. Is there an easy way to do this with scp? Right now I copy /etc/passwd from one box to another with scp, but sometimes I make mistakes or forget a step, and scp inside of shell scripts don't seem to works so well since they require password authentication. Any recommendations would be welcome.

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• Why my browsers display XML files as blank pages?

  - by n1313

  Every time I open an XML file, all I get is blank page instead of tag tree. The file itself is correct and loads okay, I can see it via View Source or in the Firebug. I've tried turning off all my addons and tried running Firefox in safe mode, but the problem was not solved. I'm guessing that I've messed up my configuration somehow and Firefox now tries to render XML files as HTML ones. I've tried googling, but with no success. Help, please? UPD: example file: http://lj.lain.ru/3/1273657698603.sample.xml Also I've noticed that somehow all of the browsers on the machine are now acting the same, so I'm changing the question accordingly

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• How to do a 3-tier using PHP [closed]

  - by Ric

  I have a requirement from a client for my PHP Web application to be 3-tier. For example, I would have a web server on Apache in the DMZ, but it should NOT contain any DB connections. It should connect to a Middle server that would host the business objects but be behind the firewall. Then those objects connect to my SQL cluster on another server. I have actually done this using .NET, but I am not sure how to setup my stack using PHP. I suppose I could have my UI front tier call the middle tier using REST based web services if I create my middle tier as a second web server, but this seems overly complex. The main reason for this is advanced security: we can not have any passwords on the DMZ first tier web server. The second reason is scalability - to have multiple server on different tiers that can handle the requests. The Last reason is for deployment - it is easier if I can take one set of servers offline for testing before putting them back in production. Is there a open source project that shows how to do this? The only example I can find is the web server hosting files from a shared drive on another machine (kind of how DotNetNuke pretends to be 3-tier), but that is NOT secure.

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• Unable to extend desktop

  - by CSharperWithJava

  I'm trying to hook up my TV to my computer as a gaming/multimedia center but I'm having troubles setting it up. I have a custom built machine running Windows 7 RC. It has an ATI Radeon 4800 video card with 2 dvi output and 1 S-video output. I have an s-video to composite adapter that connects to my tv. (It's an old TV with only Cable, composite, and s-video connections). I can switch the desktop to my TV without a problem, but I can't duplicate or extend my desktop onto it. I've installed the latest drivers and Catalyst Control Center, but it won't let it work any more readily than Windows would. Any suggestions? Would using an s-video cable instead of the adapter change anything? (The only reason I use the adapter is because it came with the graphics card) (Edit) I installed the latest drivers and I can now duplicate the screen (show on one monitor and on the TV), but I still can't extend the desktop.

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• Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

  - by mcfrosty

  I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up where my virtual windows box talks to the Mikrotik via private or internal network on the Hyper-V host. I can get the two machines to talk, but as soon as I set up a bridge on the MT, all traffic ceases between the two. Is it possible to create a bridge for this purpose (having the MT silently in front of my firewalled server)? I could really use some help.

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• Is there a faster way to deploy an OVA template?

  - by Luke

  I need to deploy vSphere Server Appliance 5.1. I have vSphere Client running locally and my internet upload is capped at 3 Mbps. It says it's going to take about 200 minutes to upload. When selecting a URL as opposed to a local file, does vSphere Client download it locally and then upload, or does it download the OVA directly to the server? My goal is to avoid waiting 3 1/2 hours for this to upload. If specifying a URL isn't any faster, are there any other methods that would allow me to deploy from the datacenter instead of my office? We don't have any Windows VM's installed on our cluster. So unfortunately I don't have a Windows machine with faster upload speed.

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• how to type/send hex on a putty session

  - by Amit Phatarphekar

  I'm using Putty to make a serial connection to a device. I need to send a Hex string on this session. How do I do this? The Hex String is FF7E414244 This is required to break the serial device into command interface mode... From an XP machine, I can use HyperTerminal. And then on the serial connection, do a "send file", where the file has this hexstring entered using hex editing means. So this mechanism works. But now I have a windows 7 with no hyperterminal. so I'm using putty. But now how do I send the hex string? Thanks

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• Squid proxy server not forwarding traffic

  - by DilbertDave

  I'm trying to set up a web filtering system (dans guardian) on my home network but am failing at the first hurdle - configuring the Squid Proxy server. No matter what I do I cannot seem to configure it properly and I just receive the 'Requested URL could not be received' error page. If I remove the proxy setting on the browser everything works normally. Ultimately I want to run this on something like a Raspberry Pi but at the moment I'm testing with a virtual machine (although efforts with a netbook were equally unsuccessful). The VM has a clean installation of Linux Mint 15 and I've installed squid via apt-get. I've followed numerous walkthroughs but this on (https://help.ubuntu.com/lts/serverguide/squid.html) pretty much sums up the process I've been taking. I'm obviously missing something but cannot figure it out - any assistance appreciated.

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• How to make Windows 7 Network show Samba share after VM is rebooted/restored?

  - by lackey

  On Windows 7, I have VirtualBox running Linux (Ubuntu 8.04), with Samba set up so that the Windows host can access it. But if the virtual machine is shut down & restored, or rebooted, the Windows Network no longer shows it. I've tried refreshing many times, restarting Samba, disabling/enabling the virtual network adapter, and running the succession of commands ipconfig /release, ipconfig /flushdns, & ipconfig /renew, but none worked. As a last resort I could restart the host itself, but is there a better way?

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• Keepalived with apache unable to bind interface on Backup server

  - by davideagle

  I have two debian 6 servers running keepalived 1.1.20 with one server acting as a Master and the other as a Backup. Both servers host apache 2.4 that have a global Listener on all interfaces on port 80 (Listen *:80) how ever I have some sites that require a listener for port 443 (SSL) and that is configured for each VirtualHost in the Apache config since I do not want every VirtualHost to listen on port 443. The problem is when I try to start Apache on the Backup machine that does not hold the virtual interface the VirtualHost is supposed to be listening on, I get AH00072: make_sock: could not bind to address 1.1.1.1:443. I know this is expected behavior of Apache. The real question is are there any known workarounds or solutions to this scenario?

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