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• Pygrub with DRBD on Xen 3.2

  - by Joril

  Hi all, we have a two-node cluster using DRBD 8.2 on CentOS 5.2 64bit. The cluster runs a few VMs on top of Xen 3.2.1, here's the configuration for an Ubuntu Jaunty VM: name = 'dev' bootloader = '/usr/bin/pygrub' memory = '512' vif = [ 'ip=192.168.1.217,mac=00:16:3E:CD:60:80' ] disk = [ 'phy:/dev/drbd24,xvda1,w', 'phy:/dev/drbd25,xvda2,w' ] As you can see, the disks are specified like "phy:", and as such pygrub doesn't know a thing about the underlying drbd device... So my problem is that even though the VM boots just fine, it doesn't handle the state of the drbd device. As a result, when for some reason the device gets to a secondary/secondary state, the VM won't boot, and I have to manually specify which node is primary. I read that starting with Xen 3.3 pygrub understands the "drbd:" specification, and I think that it would fix my problem, but I can't upgrade Xen at the moment... Is there a workaround? For example, could I use the 3.3 version of pygrub? Thanks!

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• Missing Right Click Menu Text After Sleep

  - by petebob796

  I have a laptop running Windows 7 and regularly close the lid to put it in sleep mode. Recently after resuming from sleep if I go to access the right click menu in the windows shell when I hover over the menu items the text disappears and doesn't re-appear without closing the menu and right clicking again. The only way to fix this is to restart. Any ideas what could be causing this? I have an nvidia 8600m gs graphics card which had a BSOD problem a while back at boot up but since I underclocked it slightly it has been running fine and I experience no other issues but this. This only affects right click menus that are part of the windows so not any programs right click menu. It's not a major problem just strange and a little annoying.

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• How to determine main movie DVD track before ripping via mencoder

  - by Ampp3

  Maybe there's a simple answer for this, but when looking at the files on a DVD (IFOs, VOBs,etc), is there a way to easily determine the longest/main track? I'm trying to automate the process of finding the main movie track on a DVD and am running into issues. I thought this could be done by finding the BIGGEST track (look through VTS_XX_N.VOB files, where XX is the track number, and find the track with the largest filesize (sum sizes of VOB files for that track)), but apparently that isn't correct. One DVD had track 7 as the largest track (by my method), but mencoder didn't produce the correct output with this track, but worked with track 9 instead. Am I missing something? EDIT: I've heard of the utility 'lsdvd' for getting track information, but I was hoping to avoid compiling this, and use a basic method instead (ie: what I tried above). Does anyone have any idea WHY my idea didn't work?

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• Django freezes when adding objects through the admin

  - by Quartz

  I have a Django 1.1 website running via Apache/mod_wsgi with a PostgreSQL 8.3.1 database. Recently, when I added objects through the admin interface, the connection froze up and I lost several worker processes, so I had to restart Apache. Upon trying to replicate this, I found that it only happens through the admin: if I go into the Django shell and issue the same insert, it works fine. Also, performing an UPDATE operation works without issues, so just INSERTs. I've rebuilt indexes on PostgreSQL and run a full VACUUM. Error logs don't show anything, and I can't figure out for the life of me what's wrong. Anyone have any ideas?

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• Best practice for scaling a single application source to multiple nodes

  - by Andrew Waters

  I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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• Outlook 2007 disconnecting after sending email to specific email

  - by Michael

  So when a user emails another tech in my domain they get the prompt for username/password as though they got disconnected. I have not seen any issues in the event logs, tried deleting the email address from his auto correct, ran Outlook in safe mode and searched online as well. I am kind of lost. Checked the event logs on the exchange server as well in the security and still nothing. Exchange 2010, Client OS: Vista x64, Outlook 2007. Thanks!

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• Linux: don't use file system cache under a directory

  - by GetFree

  For a PHP website I'm monitoring, I need to see what files are being used each time the browser makes a request. I thought of using find . -type f -amin 1. With that I get all files which were read in the last minute (it's a developing server so only I am using the website). I took care of removing the noatime attribute from the mounting point. However there must be something else that's preventing the kernel from reading the actual files on disk because the access time is not being updated when I read a file. I guess it must be the file-system cache which is retrieving the files from memory. Is there a way to disable file caching under a specific directory? (public_html in my case) Also I read somewhere that there is the nobh mounting atributes which apparently disables file caching under that mounting point, but I'm not sure.

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• Optimal way to make MySQL backups for fairly large databases (MyISAM / InnoDB)

  - by WinkyWolly

  Currently we have one beefy MySQL database that runs a couple of high traffic Django based websites as well as some e-commerce websites of decent size. As a result we have a fair amount of large databases using both InnoDB and MyISAM tables. Unfortunately we've recently hit a wall due to the amount of traffic so I've setup another master server to help alleviate reads / backups. Now at the moment I simply use mysqldump with a few arguments and it's proven to be fine.. until now. Obviously mysqldump is a slow quick method however I believe we've outgrown its use. I now need a good alternative and have been looking into utilizing Maatkits mk-parallel-dump utility or an LVM snapshot solution. Succinct short version: I have a fairly large MySQL databases I need to backup Current method using mysqldump is inefficient and slow (causing issues) Looking into something such as mk-parallel-dump or LVM snapshots Any recommendations or ideas would be appreciated - since I have to re-do how we're doing things I rather have it done properly / most efficient :).

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• Virtual Server 2005 R2 kungfu

  - by AngryHacker

  Does Virtual Server 2005 R2 have a command line interface, that's versatile enough? Here is a situation. I run a Win2k VM on an old memory constrained machine. I allocate it 378MB of RAM and the VM runs just fine. Once a month, inside the VM, I backup the (a very large) database, compress it using 7Zip and ftp it to the backup site (all in a script). Unfortunately the compression part takes a massive amount of RAM (far exceeding the 378MB), it goes for the paging file and brings absolutely everything to a crawl and literally takes 2-3 days, if left unattended. So to fix this, I have to shutdown the VM, give it temporarily 768MB of RAM and then the whole thing finishes in 20 minutes. So, is there a way do the following automatically from the host machine in a script? Shutdown the guest OS (I think, I got this part) Change the RAM allocation from 378 to 768 Start the guest OS again then, 1 hour later, do everything in reverse.

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• How to configure an ASUS motherboard.

  - by Absolute0

  I have an ASUS P7P55-M motherboard running with an Intel Core i5-750 processor and 4 GB RAM with 1600 MT/s speed. For some reason the default settings of the motherboard make all the components run at half their optimums. I have switched to the "D.O.C.P." profile and supposedly everything is as it's supposed to be (verified with CPU-Z). There is also an "X.M.P." profile and a manual one. Are either of the DOCP or XMP safe to go with? I wouldn't use the manual mode as I would likely mess something up real bad. XMP seems to be more memory oriented.

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• Putting our OLTP and OLAP services on the same cluster

  - by Dynamo

  We're currently in a bit of a debate about what to do with our scattered SQL environment. We are setting up a cluster for our data warehouses for sure and are now in the process of deciding if our OLTP databases should go on the same one. The cluster will be active/active with database services running on one node and reporting and analytical services on the other node. From a technical standpoint I don't see an issue here. With the services being run on different nodes they shouldn't compete too heavily for resources. The only physical resource that may be an issue would be the shared disk space. Our environment is also quite small. Our biggest OLAP database at the moment is only about 40GB and our OLTP are all under 10GB. I see a potential political issue here as different groups are involved but I'm just strictly wondering if there would be any major technical issues that could arise from this setup.

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• Monitoring host and app parameters in real-time

  - by devopsdude42

  I have a bunch of VMs that I need to monitor in real-time. For all nodes I need to watch host parameters like load, network usage and free memory; and for some I need app-specific metrics too, like redis (some vars from the output of INFO command) and nginx (like requests/sec, avg. request time). Ideally I'd also like to track some parameters from the custom apps that run on these node too. These parameters should get tracked as a bunch of line charts on a dashboard. I checked out graphite and it looks suitable (although the UX and aesthetics looks like it needs some love). But setting up and maintaining graphite looks to be a pain, esp. since we don't have a full-time person just for this. Are there any alternatives? Or at least something that is simpler to setup and will scale? Reasonable paid services are also ok.

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• Motherboard warning lights when plugging in a display port cord to graphics card?

  - by rllr

  Earlier today, my computer spontaneously shut itself off and refused to turn back on. I tested my PSU and it's operating fine. I unplugged everything and let it sit for a while and it started to make a high pitched coil whine/hiss. When I came back an hour later and plugged in only the power cord, it turned on without any issues. After some troubleshooting, I noticed my motherboard (Intel D975XBX2) has a red CPU led and VR led that come on whenever I plug my monitor into my graphics card via display port. DVI does not cause a similar issue. I was running three monitors off the card, so I need both DVI ports and the display port working. Is it likely my graphics card needs to be replaced, or should I be looking elsewhere to resolve this issue?

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• ATI Radeon Drivers works with which linux distribution and version?

  - by amit.codename13

  I have ATI Mobility Radeon HD 5850 graphics card. Almost every new linux distribution seems to have an issue with it, when i install the drivers. Working without utilizing the graphics card leaves me so unproductive. So i made a plan to use older versions of linux, any distribution suitable as a desktop distribution. UPDATE: The kind of problems that i am facing are, 1) After installing drivers the system boots and hangs, 2) There are unusual lines over the screen 3) After upgrade system doesn't start properly(hangs the usual old way) The kind of answers i am looking for is, distribution X(the newer the version the better) doesn't have the above problem after installing drivers for ATI Mobility Radeon HD 5850 graphics card. UPDATE: The new drivers released by AMD seems to fix all the issues, although they are still beta Thanks

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• VSTS2010 crashes on opening the team explorer->My queries node

  - by vstsuser

  VSTS2010 crashes on opening the team explorer-My queries node this does not repeat if MSN office communicator (2007 R2 version) is exited. the issue occurs only if MSN office communicator is up and running. (no issues reported by communicator though) Any help in this regard? Debug log: Unable to cast COM object of type 'CommunicatorAPI.MessengerClass' to interface type 'MessengerAPI.IMessenger2'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{....}' failed due to the following error: Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)). Windows event log EventType clr20r3, P1 devenv.exe, P2 10.0.30319.1, P3 4ba1fab3, P4 microsoft.teamfoundation.collaboration.microsoft, P5 10.0.0.0, P6 4c7d8ce4, P7 49, P8 0, P9 system.invalidcastexception, P10 NIL.

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• Staggering java linux process startup to prevent OOM

  - by ctennis

  I am running a number of java processes on a single Linux machine. From a memory and computing standpoint, everything is fine when things are static. However, periodically we use a configuration management package up upgrade the jar or war files, and restart the java process. The problem is, that is restarts them all relatively quickly, and so we get 10 or so java VMs restarting all at the same time (we use daemontools for the service stops/starts), which wreaks havoc on the machine, in terms of OOMs or just really slow. This is because it's spawning the JVM 10x at the same time. Other than trying to stagger the startups, is there a smarter way of handling this? Maybe a sysctl tuning performance parameters, or a JVM parameter?

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• Single domain user can't install a specific shared network printer

  - by drpcken

  I have a file server serving up shared network printers. Never had any issues in the past. I have a specific domain user (just 1) that gets this error when trying to install a specific printer: You do not have sufficient access to your computer to connect to the selected printer This user can install all the other printers no problem. All my other domain users can install the printer with no problem. I've removed the driver from the local client and tried again but with the same problem. Even as an administrator I get this error. Is there something I'm missing?

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• Laptop Locking Up

  - by David

  I am having a very weird issue on a Lenovo W510 laptop. It will lock up randomly. I have had it lock up during post, during the boot-up of Linux, during login, and after the login. The following are tests that I have performed on the laptop. I ran memtest I took out the extra memory module. I swapped the HDD with another HDD that had Windows 7 on it. (It BSOD'd, and before anyone could possibly read the error line, it restarts.) I tried taking the battery out and booting with only the Power cord. The only other options I can think of the problem being are the motherboard or the PSU. If anyone has any advice, I appreciate it. If not, the HP guy will be here in a few days to fix it. I would just love to call them up and tell them that the service is no longer needed.

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• .htaccess enabled, but not working.

  - by Aristotle

  I been having some very frustrating issues with getting .htaccess to work on my new server. I'm not very experienced in managing a server, but I've spent the last three days pouring over documentation and every resource I can get my hands on. I've attempted to try a very basic application of .htaccess, and yet it fails to give the expected results. I've setup a test over at http://173.201.185.217/test/. Immediately within this directory is an .htaccess file with the following command: deny from all If I'm not mistaken, this should deny access to /test, but it doesn't. It just sits there allowing anybody to view the contents. What could be wrong with my server/configuration? The server is running CentOS.

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• sudo: cd: command not found when trying to get to /var/log/apache2

  - by Piers

  I'm running Ubuntu 10.04 and am having issues getting to the log files in /var/log/apache2 I can cd to most other places (I haven't tried every single file, obviously) but when I try to get to the above directory, I get the error message sudo: cd: command not found ... I've just tried something else and I can't cd when used in conjunction with sudo. I can use sudo when doing things like apt-get but it seems I can't change directory when using sudo. I haven't been on this server for a while but I know I used to be able to do this.

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• How can I optimize ubuntu desktop to run my webserver

  - by Parry

  Hi, I am using ubuntu desktop edition to run My drupal website on Intranet. I know for running web servers best thing to install is ubuntu server editions, but due to some problem i am using Desktop edition. I installed XAMPP on my machine an my website is up and running. I want to know how can i optimize my machine?? Since I will not use very less features of desktop editions are there any things which I can remove or stop which will free memory and cpu consumption, are there any packages which i should install to increase the performance of my ubuntu??

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• A space-efficient guest filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• Need hard disk recommendation for linux home server.

  - by neotracker

  Hello, I'm planing to build a little linux homeserver. It will mainly be used for storage and maybe as an media pc. I plan to build a software raid5 with 4 1.5TB or 2TB hard drives. I already decided to use the Western Digital Caviar Green 1.5 TB drive, but then I read about some problems with the WD green series about many drives failing and that they are not recommended for raid anyway. Of course, I couldn't find much facts on the issues so I thought I just ask here ;-) What hard drives would you recommended for a software raid5 setup? As I only need it for storage, the whole thing doesn't have to be too fast. So I prefer a cheap price and silence to great performance.

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• Firewire 800 with Windows

  - by Amitesh

  I have two windows machine with windows server 2003 installed on them. I am running a Lab View script on 1 machine and storing the data. But since it has less memory, I want to transfer data to another machine using firewire 800. Is it possible to configure out the second machine just as an external HDD attached to it and write data directly to it? (This is possible with MACs) Dont want to use the ethernet (internet/ TCP/IP prot.) to transfer the data. Is it possible? Thanks.

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• Ways to remotely reboot a Linux system

  - by dualed

  I had a remote server running Debian Sarge that experienced some HDD failure and I meant to reboot it hoping that fsck could repair the errors automatically. I eventually drove out there and replaced the faulty disks... But I was wondering: What other ways are there to force a Linux system to reboot that do not require hard drive access? What I had tried: shutdown -r now Did not work, as shutdown is a program that would have to be loaded from disk, the error shown in the terminal was bash: /sbin/shutdown: Input/output error init 6 same as above telinit q same as above kill -2 1 This did not print an error, but did not work either. (However, it is possible that the Sarge init did not implement SIGINT, the sarge manpages did not mention it. So it could work in a more recent version of Debian) This guide on PCFreak.net. However, this failed at sysctl, which was not in memory either.

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