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• Poor CPU usage under Ubuntu

  - by remek

  Hello, I just upgraded from Ubuntu 9.10 to Ubuntu 10.04 and I am now experiencing a strange problem. My computer has a quad-core processor, and when I am running several processes simultaneously, none of the cores is fully used. Before the upgrade, when I was running 4 processes, each of them was using 100% CPU (I could see that with the 'top' command). But now, CPU usage oscillates and is always pretty low. Has anybody an idea about this problem? Is it due to Ubuntu or to the program I am running? Thank you very much in advance for your help! Best, remek

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• Own website fails to load first time

  - by AmazingDreams

  I have a website running on a VPS, every time I first try to load the website the connection times out. If I press try again, it loads directly. I'm not sure whether this is a DNS issue or a server issue. As far as I know everything is set up correctly. Also, it has been doing this from the moment I got this server and set up my domain name. And that's about two to three months ago. You may take a look here: http://www.wegotcha.nl/ As you can see at this moment it's just an image, there are no scripts running in the background or anything. The only error Apache gives me is that favicon.ico cannot be found. It's an Apache webserver running on Ubuntu 12.04.1 (newest version) I update all packages almost every day (apt-get update && apt-get upgrade). I am merely an amateur on the area of webservers so any help will be appreciated. :)

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• Kill xserver from command line (init 3/5 does not work)

  - by Richard Martinez

  I'm running Linux Mint 10, although I've had this same issue with other variants of Linux. I've been told/found while researching that if the X server hangs or otherwise errors, one can drop to a root prompt, usually at another tty, and execute init 3 (to drop to single user mode) and then init 5 to return to the default, graphical session. Needless to say, I've tried this before in multiple configurations on multiple machines to no avail. The only feedback I receive form executing those two commands is a listing of VMWare services (from a kernel module) that are stopped and then restarted. Note: If I run startx (either before or after init 3), then I am told that the xserver is still running and that I should remove /tmp/.X0-lock. Having tried that, it removes that error message, but claims that the xserver cannot be attached as another instance is running. How do I kill the xserver completely? Can I killall some process name?

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• "remote file operation failed" on Hudson

  - by Aveen

  I am running a Windows slave for Husdon 1.337 (Linux master). When running a project on the Windows node, it fails with the following message: Building remotely on winTestSlave Checking out a fresh workspace because there's no workspace at C:\hudson\***\ejb remote file operation failed It did work yesterday and I have not upgraded Hudson or changed its configurations (or the slave's configurations) in any way. I establish the connection between the slave and the master by running the following command on a cygwim prompt on the slave: java -jar slave.jar -jnlpUrl http://myserver/computer/winTestSlave/slave-agent.jnlp I saw the issue http://issues.hudson-ci.org/browse/HUDSON-5374 and did as instructed in the work-around but that did not work. I also tried with a newer version of slave.jar (version 1.356) but that did not work either. Does anyone please have any idea of how to fix this? I really cannot find more information anywhere else!

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• having trouble setting up ganglia on three machines

  - by Pieter Breed

  I am running ubuntu 11.10 I have one machine with gmetad, gmond and ganglia-webinterface. When I browse the web interface this machine picks up the local gmond output. I then added another machine, running only gmond. I didn't really change anything in the config, only the name of the cluster. This machine's output showed up in the web view. The I tried to add a third machine, similarly to the second, but it's not showing up in the web view. I tried looking at syslog and running as a daemon, but I'm not seeing anything suspicious there. Any tips for trouble shooting this?

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• VirtualBox: Grub sees hard drive, Linux does not

  - by thabubble

  I installed Linux on my second hard drive. I can boot to it just fine. But when I try to boot it from a Windows 7 host using http://www.virtualbox.org/manual/ch09.html#rawdisk, grub sees it and can load vmlinuz and initramfs. Log: :: running early hook [udev] :: running hook [udev] :: Triggering uevents... :: running hook [plymouth] :: Loading plymouth...done. ... Waiting 10 seconds for device /dev/disk/by-uuid/{root UUID} ... ERROR: device 'UUID={root UUID}' not found. Skipping fsck. ERROR: Unable to find root device 'UUID={root UUID}' It then drops me into a recovery shell. I checked "/etc/fstab" and it's empty, there are also no sd* devices in dev, the only thing in /dev/disk/by-id is a VBox CD device. I'm not too good with these kinds of things so help would be greatly appriciated.

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• Reccomendation for tuning 100's of SQL Databases

  - by wayne

  I'm running several SQL servers, each running a few hundred multi-gig databases for customers. They are all setup homogeneously as far as the schemas are concerned, however customer usages of the data differ quite a lot from database to database. What would be the best way to auto-index/profile/tune this large amount of databases? As there are at least 600 or more catalogs I cant have someone manually profile, and index as required by each databases usage patterns. I'm currently running SQL 2005 but will be moving to 2008, so solutions that work with either are fine.

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• Prevent Java application from accessing/monitoring/altering clipboard contents

  - by mcstrother

  I'm a student using a service that provides practice questions for standardized tests. The service requires that I access the questions by downloading and running a Java application. If I try to copy anything from any window of my computer (including applications unrelated to the question bank) while the application is running, the copied item is replaced with an obnoxious message asking me to not pirate their copyrighted material. I find this obnoxious, and I also really don't like the idea that any application can slurp up any and all potentially sensitive information that I happen to copy while it's running. Is there are a way to limit the privileges of this application to stop it from doing this? Thank you!

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• How can I disrupt my roommate's BitTorrent?

  - by bob

  We're on a 50 mb/s Comcast connection and our connection right now is coming in under 1.5 mb/s. Our roommate left for a week with BitTorrent running (Azureus client, we think). Our latency is approaching 300 ms. His door is locked up tight, and both his machine and the router for the house are located inside. I've even flipped the power breaker in the house and that barely works for 2 minutes. His laptop keeps on running, and once the cable modem and router come back up and the machine reconnects, the torrents resume in earnest. I've been running nmap and identified his IP on our LAN. Is there anything I can do over the LAN to make his torrents start to fail or slow down?

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• KVM/Qemu Guest Shutdown problems

  - by Gaia

  on both host and guest running CentOS 6.3 with KVM/Qemu virtualization, I have the following scenarios: "virsh shutdown kvm1" did not shutdown at all. virsh lists guest as running. "service libvirt-guests stop" did not shutdown in 280 seconds (shutdown_timeout=300. on_shutdown=shutdown) "shutdown now" from within guest, guest becomes unreachable. virsh lists guest as running, though it could not connect to it. "shutdown -h now" from within guest works. "shutdown -r now" from within guest works. Libvirt logs show nothing for the first 3 scenarios. I can pause the guest fine. Bottom line, I cannot shutdown from outside the guest. What do I check to figure out what is going on?

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• Compilation of Etherpad fails in an OpenVZ VE

  - by ulf

  Hi everyone. I’m almost giving up, this will be my last try: I try to compile Etherpad on my OpenVZ server. It’s running a Debian 5.0 as the host system, in the VE I’ve got Ubuntu 10.04. I installed Etherpad in this VE with the instructions from the official Ubuntu Wiki: https://wiki.ubuntu.com/Etherpad. Everything runs fine until it comes to compilation. After calling bin/build.sh as described in the wiki the first steps are running fine. But then I’m running into a memory error: java.io.IOException: Cannot run program "cp": java.io.IOException: error=12, Cannot allocate memory Well, I understand the error message but don’t see the cause. The command free tells me that there’s plenty memory left in this VE: total used free shared buffers cached Mem: 2415236 1140872 1274364 0 0 0 -/+ buffers/cache: 1140872 1274364 Swap: 0 0 0 Beautiful. But even repeating the compilation process doesn’t bring me any further. Any help would be appreciated.

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• How can I access a Web server in a VM from an iPad?

  - by Nick Haslam

  I have a virtual machine (running Windows Server 2012, if it's relevant), on VMware Workstation. It is running an Apache Tomcat web server, and I'm wanting to access that webserver from an iPad. Is this feasible, or even possible ? I have tried running Connectify Hotspot on the host machine, but that only gets me as far as being able to access a webpage on the host machine. It doesn't look to pass the connection through to the VM as they are on different subnets. Any thoughts are gratefully received.

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• HAProxy being killed with more that 54,000 connections

  - by Olly

  I am trying to run HAProxy (1.4.8) on a EC2 machine running Ubuntu 10.04. I need HAProxy to be able to handle many thousands of long-running persistent connections (websockets). With the current setup HAProxy gets killed at around 54,300 connections (roughly). If I am running HAProxy in the foreground, the only output is "Killed". Am I right in thinking this is the Kernel killing the process? Is this because it is out of resources? Can I increase the resources? The CPU and memory consumption are low with 50,000 connections, so I don't suspect either of these. How can I prevent this from happening?

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• PS3 through line in?

  - by h20

  Hey all. I'm looking for a way to chat through LAN (via PC) while playing PS3. Would it be possible to run my PS3's sound through my desktop's "line in" and somehow (if possible) mixing it with my normal PC sound to produce one output that I could, say, use with headphones? I'll add that I'm currently running to line in (not mic) from the line out on my monitor (Flatron W2453V), where my PS3 is hooked up via HDMI. I tried running femalex2 to male 3.5mm splitter, but it dims my PC sound when PS3 sound is available. Chat would be impossible. Currently running Linux Mint if that's of any concern, but am willing to switch to any flavour of Linux to get this working

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• Apache and fastcgi - How to secure an Apache server with fastcgi enabled?

  - by skyeagle

  I am running a headless server on Ubuntu 10.x. I am running Apache 2.2. I am writing a fastcgi application for deployment on the server. I remember reading a while back (I could be wrong) that running CGI (and by implication fastcgi) on a server, can provide 'backdoors' for potential attackers - or at the very least, could compromise the server if certain security measurements are not taken. My questions are: what are the security 'gotcha's that I have to be aware of if I am enabling mod_fastcgi on my Apache server? I want to run the fastcgi as a specific user (with restricted access) how do I do this?

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• How to run a GUI app from ssh shell?

  - by karramba

  I can access my linux box by ssh and by vnc. I want to run a GUI application, but directly from ssh, I don't want to access through VNC and click around. So, after logging in using ssh, I want to issue a magic command, so that when I log in through VNC I will see my GUI app running. How can I do this? edit: The linux box have X server running on it. I need to automate restarting a GUI application. I want to do it without any kind of GUI interaction. What I need: login through ssh on SERVER run my GUI app by forcing it to bind to X server running on SERVER ??? PROFIT!

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• How do you know where macports installs python packages to?

  - by xmaslist

  I am running macports to install scipy and such on OS X leopard with python 2.7. The install runs successfully, but running python and trying to import the packages I've installed, they're not found. What I'm running is: sudo python_select python27 sudo port install py27-wxpython py27-numpy py27-matplotlib sudo port install py27-scipy py27-ipython Opening up python in interactive mode (it is the correct version of python), I type 'import scipy' and get a module not found error. What gives? How can I find out where it is installing the packages to instead?

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• VMWare Player Run as Service

  - by Marshal

  I have a VMWare Player running a VM at all times. However I want the server to run that Virtual Machine on boot (without logging in). This will allow me basically to restart the Server and when it loads to the login screen it's already running VMWare. Any ideas? I have tried reading up on it however websites suggest VMWare Server. This is no longer backed by VMWare anymore. So I am looking to either make VMWare Player a service or if anyone else has any other ideas? Running Win 7 on my server btw Thanks for looking.

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• Moving Domain Controller Guests between Hyper-V Hosts

  - by Jim

  We're moving our domain controller to a new Hyper-V host. I read it on TechNet about not using export on a VM running as DC (although I saw a lot of answers on TechNet suggesting doing so to move DC). What we plan to do is shutdown the VM, move the VHD to the new Hyper-V host, then create a new VM using that VHD. I don't think USN rollback would occur since it's like shutting down the VM and starting it back up. We have another Hyper-V host with a DC guest that will be running during the migration. All the hosts and VMs are running Windows Server 2008 R2. Is it a good way to move virtualize DC b/t hosts? If not, how should I proceed?

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• Ubuntu Server Edition (Jaunty) x64 Segmentation faults in PHP mysql package

  - by Deeksy

  I've been running Jaunty with Apache2, PHP & MySQL running drupal websites as well as python 2.6 and trac on the same server. I'm getting quite a few segmentation faults and suhosin warnings on my drupal websites which don't seem to be related to the amount of RAM the server has (3GB) as the trac site is running happily without issues. The issue seems to be related to PHP accessing mysql and I'm getting suhosin warnings. Has anyone else seen this problem? Any ideas on how to fix it? Funnily enough, it's not a consistent error, as restarts tend to fix the issue temporarily.

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• In VirtualBox, how can I access host localhost from guest (Visual Studio Dev Server from IE7 testing VM)?

  - by Seth

  Host OS is Win7 running MyApp in the Visual Studio Development Server, bound to localhost:51227, VM is VirtualBox configured with NAT. Guest OS is Win XP with IE7 installed. My goal is to debug MyApp (running on host) from within IE7 (running on guest). Visual Studio Development server only binds to the loopback network device (i.e. localhost). It does not bind to the external IP address of my host. I've tried access 10.0.2.2:51227 from IE7 on the guest (and confirmed that 10.0.2.2 is the gateway address using ipconfig), but it appears that 10.0.2.2 binds to the external IP of the Host, NOT the loopback IP (localhost), so this does not work. Any suggestions?

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• Linux- passwordless ssh from system (root) script

  - by redmoskito

  What's the easiest way to have a system script (running as root) execute remote commands over ssh? I've written some scripts that execute commands remotely via ssh, and they work great when I run them as myself, as I've set up ssh-agent and keys for passwordless login. I'd like to call these when my laptop docks and undocks. I've been successful at running arbitrary scripts when docking/undocking, but since the ACPI event scripts run as root, trying to run my ssh script fails during authentication. I tried using sudo with the -u and -i flags to simulate running the script as my user, e.g.: sudo -u redmoskito -i /home/redmoskito/bin/remote_command which successfully finds my private key and tries to use it, but the ssh-agent credentials are still missing, so it still needs my passphrase.

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• Terminal Server 2003 Login Issue - Insufficient system resources exist to complete the requested ser

  - by LP

  Afternoon. We have three identical terminal servers running Windows Server 2003 SP2, on these servers there are about 250 concurrent users logged on. We're running Roaming Profiles on a central server running Active Directory which cache the profiles locally on each terminal server as well. When one, and just that one, user tries to login she gets this error message (roughly translated from Swedish): "You could not be logged in becouse your principle could not be registered. Check that you're connected to the network or ask your administrator Insufficient system resources exist to complete the requested service." Anyone have an idea about this? I'm stumped ... Best Regards LP

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• Linux freezes every few seconds

  - by Zeppomedio

  We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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• I'm trying to setup Xvfb to run an GUI app on a remote server with no display

  - by jz87

  I have a 3rd party java app that I need to run on a remote server. Unfortunately, the app is designed for the desktop and assumes a GUI is available. The thing is I would like to leave this app running on the remote server without having to tie up my desktop machine with a persistent VNC connection to the remote machine. I'm trying to setup Xvfb on the remote machine so emulate a graphical environment, connect to the remote machine via VNC to launch the app and configure parameters and then log off and let it run. Here's what I have so far: I have ubuntu 11.04 server apt-get install xvfb apt-get install fluxbox apt-get install x11vnc Xvfb :1 -screen 0 1024x768x16 & fluxbox & At this point I run into a problem because it gives a very undescriptive error: Cannot connect to server. How do I know if the server is running and that it's running properly?

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