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• Trying to understand Wireless N vs Wireless AC

  - by EGHDK

  Whenever a new wireless standard gets approved you expect faster speeds and longer range. From everything that I've read about it, it seems that AC will only transfer over the 5GHz band and up to 3Gbps. Studying the new AC routers on the market, it seems that they will transfer over 5GHz and 2.4GHz. And 5GHz will only transfer at 1.3Gbps. Which isn't what AC is supposed to be. I know there is a difference between what the standard actually says, and what products will actually do, but is there any reason for this? Is there any other main differences between AC and N? I've heard people discussing AC and saying that it's finally "fixing" what N was supposed to fix... what do they mean by that? Any security benefits? I have seen this image online: Will AC really do that? Will that require an AC network card in my laptop for that to actually happen? Lastly, will the router only be able to communicate with AC devices if I have beamforming technology on? I know it's a ton of questions, but most articles online seem to be outdated, and don't provide too much reliability.

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• vmware - ACE, Workstation - how to manage remoe clients??

  - by tom smith

  Hi. Exploring Vmware products/services and have a few questions. As I understand VM, you can use VMWare Workstation to create a VM of a target machine/box/OS. Let's call this VM, "foo". If I have 100 client PCs in my dept, and I want to install the VM (foo) on each client, and also manage the remote VM instances of (foo). How can I accompish this? Let's assume that the client machines are running Windows7, and have the vmplayer app installed on the box. I'm looking to do the following kinds of actions regarding the remote client machines: -Update the foo VM/image with new updated copies -Make sure that every VM "foo" has the same user, but a unique passwd -Monitor the traffic/status of each client VM "foo" oin each client -Start/Stop each client VN "foo" from the master console -Etc... Can this be accomplished? How would I do it, what services/products would I need? I've tried toalking to a few of the pre-sales guys in VMWare, and got nowhere, other than telling me to email my questions!! Looking at google shed more insight, but I still have questions. So, if you have detailed VMWare understanding, pointers to consultants, or resellers who can help, all pointers are greatly appreciated. Thanks -tom

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• Very uneven CPU utilization with SQL Server 2012 on 2 processor computer with 16 cores / processor

  - by cooplarsh

  After installing SQL Server Enterprise 2012 with the Server + Cal license model, on a computer with 2 processors each with 16 cores (and no hyperthreading involved) and putting the server under extremely heavy load the 16 cores on the first processor were very underutilized, the first 4 cores on the 2nd CPU were heavily utilized, and the last 12 cores were not used at all (because of the 20 core limit for this sql server version). Total CPU utilization was displaying as around 25%. Unfortunately, the server suffered from extremely poor performance even though if the tasks were evenly distributed across the 20 cores it wouldn't have been anywhere near as bad. The Windows Server was running on a VMWare virtual image under ESX Server, but all of the CPU was allocated to the windows server. We tried changing affinity settings (e.g., allocating most cores to CPU and the others to I/O), but that didn't help solve the performance problems. Upgrading the product edition to SQL Server Enterprise Core 2012 not only allowed the SQL Server to utilize the 12 previously unused cores on the 2nd processor, but it also resulted in a much more even distribution of tasks across all of the processors. To get through the backlog of requests cpU utilization jumped to around 90%, and then came down to around 33% once it was caught up, but performance improved dramatically since we failed over to the newly updated version And the performance issues went away. I was wondering if anyone knows what might cause SQL Server to unevenly distribute the load, relying almost exclusively on the first 4 cores of the 2nd processor that had 12 cores idle, and allocate only a few tasks to each of the 16 cores on the first processor. Also, is there any way we could have more evenly distributed the load across the 20 cores that were being used without the product edition upgrade? The flip side of that question is what did the product upgrade do that caused SQL Server to start evenly distributing the load across all of the cores that it recognized? Thanks to any insight to answer these questions and/or links that might help me better understand how to make sense of what was happenings.

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• Chrome caching 302 redirects

  - by Thermionix

  I have a php script with is used to rotate banner images on a site. Under Firefox/IE page refreshes will make another request and a different image will be returned. Under Chrome, the request seems to be cached and only opening the page in a new tab will cause it to actually query the script. I believe this used to work in older versions of chrome, I've tried a few different types of redirect codes all with the same result. Any tips? <img class="banner" src="/inc/banner.php" alt=""> ~$ cat /var/www/inc/banner.php <?php header("HTTP/1.1 302 Redirect"); header("Cache-Control: max-age=0, no-cache, no-store, must-revalidate"); //header('HTTP/1.1 307 Temporary Redirect'); //header("expires: none"); //header("expires: max"); //header("Cache-Control: public"); $folder = '../img/banner/'; $exts = 'jpg jpeg png gif'; $files = array(); $i = -1; if ('' == $folder) $folder = './'; $handle = opendir($folder); $exts = explode(' ', $exts); while (false !== ($file = readdir($handle))) { foreach($exts as $ext) { // for each extension check the extension if (preg_match('/\.'.$ext.'$/i', $file, $test)) { // faster than ereg, case insensitive $files[] = $file; // it's good ++$i; } } } closedir($handle); // We're not using it anymore mt_srand((double)microtime()*1000000); // seed for PHP < 4.2 $rand = mt_rand(0, $i); // $i was incremented as we went along header('Location: '.$folder.$files[$rand]); flush(); ?> curl output; ~$ curl -I -k https://example.net/inc/banner.php HTTP/1.1 302 Redirect Server: nginx/1.1.14 Date: Fri, 24 Feb 2012 03:23:46 GMT Content-Type: text/html Connection: keep-alive X-Powered-By: PHP/5.3.10-1ubuntu1 Cache-Control: max-age=0, no-cache, no-store, must-revalidate Location: ../img/banner/2.jpg

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• CentOS OpenVZ fail to boot after kernel update

  - by SkechBoy

  After upgrading to latest OpenVZ kernel CentOS server won't boot. When i try go boot the latest kernel server is stuck at this point: (note that images are taken from virtual kvm) http://i.stack.imgur.com/4lusz.jpg Then i try to start the server on some old kernels and than i get this error message: kernel panic - not syncing - attempted to kill init better shown on this image: http://i.stack.imgur.com/2SReF.jpg Here is some useful information fdisk -l WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2995.7 GB, 2995739688960 bytes 255 heads, 63 sectors/track, 364211 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0004c4e4 Device Boot Start End Blocks Id System /dev/sda1 1 523 4199044+ 82 Linux swap / Solaris /dev/sda2 524 785 2104515 83 Linux /dev/sda3 786 261869 2097157230 83 Linux /dev/sda4 261870 364211 822062115 83 Linux /etc/fstab proc /proc proc defaults 0 0 none /dev/pts devpts gid=5,mode=620 0 0 /dev/sda1 none swap sw 0 0 /dev/sda2 /boot ext3 defaults 0 0 /dev/sda3 / ext3 defaults 0 0 /dev/sda4 /home ext3 defaults 0 0 and grub config file: title OpenVZ (2.6.18-274.18.1.el5.028stab098.1) root (hd0,1) kernel /vmlinuz-2.6.18-274.18.1.el5.028stab098.1 ro root=/dev/sda3 vga=0x317 selinux=0 initrd /initrd-2.6.18-274.18.1.el5.028stab098.1.img title OpenVZ (2.6.18-274.7.1.el5.028stab095.1) root (hd0,1) kernel /vmlinuz-2.6.18-274.7.1.el5.028stab095.1 ro root=/dev/sda3 vga=0x317 selinux=0 initrd /initrd-2.6.18-274.7.1.el5.028stab095.1.img title OpenVZ (2.6.18-194.8.1.el5.028stab070.4) root (hd0,1) kernel /vmlinuz-2.6.18-194.8.1.el5.028stab070.4 ro root=/dev/sda3 vga=0x317 initrd /initrd-2.6.18-194.8.1.el5.028stab070.4.img Any help is greatly appreciated Thanks.

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• Limiting access in Silverlight\Pivotviewer

  - by sparaflAsh

  I'm going to deploy a pivotviewer application. As some of you might know this silverlight application load a .cxml index file for a group of images. My need is to make .cxml file and image files not accessible for the user. Now, if I don't have a need I usually code like this in C# and the file is hosted in the documentroot: _cxml = new CxmlCollectionSource(new Uri("http://www.myurl.it/Collection.cxml", UriKind.Absolute)); This means that my cxml and then the images are available by http for everyone who knows the URI. I'm a newbie to server configuration, so any help/hint would be deeply appreciated. Someone suggested me to take the files out of the root, but it seems like I can't go to pick them up if they are not a URL in Silverlight. At least I didn't managed to understand how. Someone else suggested me to play with web.config file to hide URLs, but I don't really know where to start. My question is, what's the best practice to hide my stuff? Obviously I can edit the question if you need more details.

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• Why is Safari on my computer rendering all of the colors -- not just for images -- incorrectly?

  - by richardhenry

  I’m not just talking about image color profile issues; every single color that the browser renders is incorrect. It’s like it’s in it’s own color space (or something!). Screenshot: http://drp.ly/DJk1O (Opera, Safari, Chrome, Firefox) Spot the odd one out? Open this up in Photoshop or similar and try using the eyedropper to select the colour. Safari renders the same hex color completely differently. That color is set using a background-color declaration in CSS, so it should be identical in all four of those browsers. Here’s the HTML I was using: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>untitled</title> <style type="text/css"> body { background-color: #114742; } </style> </head> <body> </body> </html> Literally every website I’m viewing with my install of Safari is displaying colors incorrectly. The blue of the bar on Facebook is slightly less rich. This doesn’t occur on any other Macs I’ve tried. Any idea what’s happened to my Safari install?

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• Where to get grub files without using grub-install

  - by Jacky

  I am in a particular situation. I have a MacBook Pro with no internal CD drive and both MacOS X (minimal setup) and Linux (my main system) is installed. During a cross-upgrade to Ubuntu 12.04 I messed up grub, so that my /boot/grub directory is basically empty. This means I can't boot Linux on the laptop anymore but only get into grub rescue. Normally this is no issue as you'd just boot from a rescue CD or USB stick, but unfortunately with a MacBook Pro this is not possible (I have reFIT installed and it attempts to boot, but it fails and the manual says that Apple's EFI firmware is not able to handle this situation). From MacOS X, however, I still have write access to the Linux partition. I've now been trying to figure out how to populate the /boot/grub folder with the necessary files, to no avail so far. The ISO image of Ubuntu 12.04 contains an EFI folder which is not what I am looking for, instead I need the normal.mod files for the grub version of Ubuntu 12.04. I do not have any other machine to set up a virtual machine of Ubuntu 12.04 to extract this from after a grub-install, so I am asking for ideas here how to solve this mess. P.S.: I installed the Linux previously when I still had a working internal CD drive. This is gone now.

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• Volume licenced copy of MS Office 2007 shows "Non Commercial Use" in title bar

  - by Linker3000

  I have just removed the demo copy of Office 2007 preinstalled on a new laptop and replaced it with an install of the full professional edition downloaded from the MS Volume Licensing site and installed one of our volume licence keys, yet the apps (Word etc.) show "Non Commercial Use" in the title bar, which is what usually happens in the Home and Student edition. I have tried: Deleting the Office registration keys in the registry and using one of our other Office 2007 volume licence keys (we have 7) when prompted to re-register Uninstalling Office completely and reinstalling it from a newly-downloaded ISO burned to CD and also from a compressed file that installs from hard disk/USB stick (both from Microsoft - no dodgy stuff) Yet the non-commercial message persists. Although it's a cosmetic issue, the laptop is going to be used for customer presentations and so the sales person is rightly concerned about the image this portrays. I presume there may be something floating around the registry or in a file somewhere but I can't find it. Articles I have found elsewhere just refer to the message being related to the use of a Home and Student licence key, which is 100% not the case. Any thoughts? Thanks.

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• Copy from CDROM is very slow in Ubuntu

  - by ???

  I'm using the command to copy CDROM image: # dd if=/dev/sr0 of=./maverick.iso But it's very slow, at about 350k bytes/sec. I've searched the google, and try the command # hdparm -vi /dev/sr0 /dev/sr0: HDIO_DRIVE_CMD(identify) failed: Bad address IO_support = 1 (32-bit) readonly = 0 (off) readahead = 256 (on) HDIO_GETGEO failed: Inappropriate ioctl for device Model=DVD-ROM UJDA775, FwRev=DA03, SerialNo= Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic } RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=unknown, MaxMultSect=0 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0 IORDY=yes, tPIO={min:180,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 AdvancedPM=no Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3: ATA/ATAPI-1,2,3,4,5 * signifies the current active mode Seems like DMA is already on. And a device test gives: # hdparm -t /dev/sr0 /dev/sr0: Timing buffered disk reads: 2 MB in 6.58 seconds = 311.10 kB/sec # sudo hdparm -tT /dev/sr0 /dev/sr0: Timing cached reads: 2 MB in 2.69 seconds = 760.96 kB/sec Timing buffered disk reads: m 4 MB in 5.19 seconds = 789.09 kB/sec The CD-ROM device and disc should be okay because I can copy it very fast in Windows, using UltraISO utility. So I guess there is something not configured right in Ubuntu, is it?

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• Need to boot into chkdsk from USB on Windows netbook

  - by Gaz Davidson

  While attempting to install Ubuntu on a 32-bit Windows XP netbook, the partition resize operation failed due to inconsistencies in the NTFS filesystem (lesson learned: run chkdsk /f in Windows before trying to resize a partition in Linux). Now the installer only gives the option to replace Windows with Ubuntu, the partition can't be resized in gparted, which displays a red exclamation mark and an error log when you click it. To make matters worse, we're also unable to reboot into Windows to get at chkdsk. We get a BSoD when choosing any of the options (including the DOS recovery console thing). The netbook has no CD-ROM drive, contains no recovery image and our only connection to the Internet is via the hotspot on my mobile device. We don't have Windows recovery CDs, but we do have a USB flash drive. We have a 64-bit laptop running Ubuntu 12.04 and Windows 7 (both 64-bit). So, on to the question: Is anyone aware of a way to get into a DOS recovery console and run chkdsk from a USB disk drive, without having to pirate Windows XP or download hundreds and hundreds of megabytes of crap? If it was my device I'd just flatten it, but it isn't. Please help!

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• performance wise htaccess

  - by purpler

  hese's the my htaccess template, i wonder if anything could be added to increase website performance.. # Defaults AddDefaultCharset UTF-8 DefaultLanguage en-US ServerSignature Off FileETag None Header unset ETag Options -MultiViews #Options All -Indexes # Force the latest IE version or ChromeFrame <IfModule mod_setenvif.c> <IfModule mod_headers.c> BrowserMatch MSIE ie Header set X-UA-Compatible "IE=Edge,chrome=1" env=ie </IfModule> </IfModule> # Proxy X-UA Setup <IfModule mod_headers.c> Header append Vary User-Agent </IfModule> #Rewrites Options +FollowSymlinks RewriteEngine On RewriteBase / # Redirect to non-WWW RewriteCond %{HTTPS} !=on RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC] RewriteRule ^(.*)$ http://%1/$1 [R=301,L] # Redirect to WWW RewriteCond %{HTTP_HOST} ^domain.com RewriteRule (.*) http://www.domain.com/$1 [R=301,L] # Redirect index to root RewriteRule ^(.*)index\.(php|html)$ /$1 [R=301,L] # Caching ExpiresActive On ExpiresDefault A0 Header set Cache-Control "public" # 1 Year Long Cache <FilesMatch "\.(flv|fla|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav|png|jpg|jpeg|gif|swf|js|css|ttf|eot|woff|svg|svgz)$"> ExpiresDefault A31622400 </FilesMatch> # Proxy Caching <FilesMatch "\.(css|js|png)$"> ExpiresDefault A31622400 Header set Cache-Control "private" </FilesMatch> # Protect against DOS attacks by limiting file upload size LimitRequestBody 10240000 # Proper SVG serving AddType image/svg+xml svg svgz AddEncoding gzip svgz # GZip Compression <IfModule mod_deflate.c> <FilesMatch "\.(php|html|css|js|xml|txt|ttf|otf|eot|svg)$" > SetOutputFilter DEFLATE </FilesMatch> </IfModule> # Error page ErrorDocument 404 /404.html # Deny access to sensitive files <FilesMatch "\.(htaccess|ini|log|psd)$"> Order Allow,Deny Deny from all </FilesMatch>

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• Booting Debian5 (Lenny) on 2.6.16 Kernel

  - by bk

  Due to a proprietary kernel module that I don't have the source to and is very picky about what kernel versions it will load into (even with modprobe --f), I find myself in need of running a 2.6.16.XX kernel on my Debian5 machine. The machine boots fine with the 2.6.26-2 stock kernel, and I have successfully build and booted 2.6.26 and 2.6.31 based kernels by making a .deb and the ndoing dpkg -i. However, when I do the same approach for 2.6.16, the kernel hangs at boot. I'm testing this in a VMWare image, so I don't think its an issue of newer hardware not supported by the older kernel. For a working kernel, at boot I get: Uncompressing Linux.. OK booting the kernel Loading, please wait... mdadm: No devices listed in the conf file were found kinit name_to_dev_t /dev/hda5 (dev5,3) ... With 2.6.16.60, I never get the kinit message. It hangs after the mdadm line. There are no mdadm arrays on this machine, so I doubt its an issue inside the mdadm stuff, which is supposed to just error out as it does in the 2.6.26 case above, but for some reason I'm getting stuck getting into kinit. I've been banging my head against this wall so I'm very open to suggestions on how to go about troubleshooting this.

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• Regular Windows 7 BSOD with Shrew VPN client

  - by Junto

  The Shrew VPN client appears to be a good alternative to the Cisco VPN Client on x64 Windows 7. However, since installing it I've seen fairly regular BSODs. Minidump attached: Microsoft (R) Windows Debugger Version 6.11.0001.404 AMD64 Copyright (c) Microsoft Corporation. All rights reserved. Loading Dump File [D:\Temp\020810-23431-01.dmp] Mini Kernel Dump File: Only registers and stack trace are available Symbol search path is: SRV*d:\symbols*http://msdl.microsoft.com/download/symbols Executable search path is: Windows 7 Kernel Version 7600 MP (8 procs) Free x64 Product: WinNt, suite: TerminalServer SingleUserTS Built by: 7600.16385.amd64fre.win7_rtm.090713-1255 Machine Name: Kernel base = 0xfffff800`0285f000 PsLoadedModuleList = 0xfffff800`02a9ce50 Debug session time: Mon Feb 8 18:08:12.887 2010 (GMT+1) System Uptime: 0 days 7:52:06.120 Loading Kernel Symbols ............................................................... ................................................................ .............. Loading User Symbols Loading unloaded module list .... ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* Use !analyze -v to get detailed debugging information. BugCheck A, {0, 2, 0, fffff800028d50b6} Unable to load image \SystemRoot\system32\DRIVERS\vfilter.sys, Win32 error 0n2 *** WARNING: Unable to verify timestamp for vfilter.sys *** ERROR: Module load completed but symbols could not be loaded for vfilter.sys Probably caused by : vfilter.sys ( vfilter+29a6 ) Followup: MachineOwner Machine is a brand spanking new Dell Precision T5500. Superuser appears to have several recommendations for the Shrew VPN Client as an alternative to the Cisco VPN client on 64 bit machines, so I wondered if anyone here has seen this problem and possibly found a solution to the problem? I've decided to run the VPN client under Windows 7 compatibility mode for the moment (Vista SP2) with administrator privileges to see if it makes a difference. Oddly, the VPN doesn't necessarily need to be connected. I've noticed it when browsing using Google Chrome and Internet Explorer, usually when I open up a new tab. If it carries on I think I'll be forced to shell out the 120 EUR for the NCP Client instead.

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• Enable CPU fan always on

  - by Gundars Meness

  I am using 3 years old overheating laptop and I want my CPU fan to be spinning 24/7 regardless of the consequences. How to make it spin? The problem is that CPU & GPU heats up to 68°C (154 F) right after boot and never goes down, because CPU fan is not spinning full throttle. It starts spinning faster when temperature goes over 70°C and stops when it reaches seventy again. When doing heavy work on databases, it gets from 70 to 90 in no-time and automatically powers off. Bios does not contain any "fan spin 100%" options, just "spin slowly all the time" and "auto" which is more useless than the first one since my fan doesn't have pwm wire. Currently I'm solving this with cooling stand (3x5V), but it isn't much of a help. I would rather use the CPU fan since it is the only fan directly responsible for cooling down CPU/GPU. But how to make it spin 100% all the time? Should I attach it's red power wire to motherboard to get constant 5V (is there such option?), or is there an option to control it via software? Laptop: Samsung R528 2.3 GHz Intel i3 with Nvidia GeForce 310M Bios: Phoenix 03KT.M003.20100622.KSJ (and that is latest update) OS: Ubuntu 12.04.2 LTS with 3.2.0.51 kernel CPU fan: Image/Description Has 5V 0,4A and only 3 pins, no pwm. P.S. Yes, I did clean everything with alcohol, freed the air vents, changed thermal paste etc; that reduced temperature by 4 degrees.

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• windows 7: Event 55 The file system structure on the disk is corrupt and unusable

  - by Radio

  Here is a real bad one! Windows 7 RTM with SP1 installed [Version 6.1.7601]. Recently tried to delete some folder on my hard drive and Windows prompted "Error 0x80070570: The file or directory is corrupted and unreadable", and at the same time placed an Event 55 describing "The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on \Device\HarddiskVolume2." Ran chkdsk, first with /f option, then with /r option. Result in both cases was: no errors found, 0 bad sectors. No problems chkdsk found at all! Went through StackExchange, Google and spent over 6 hours on this. Still cannot figure out the problem. Re-installing/Re-Formatting is not an option! What did I try: Hotfix - Windows6.1-KB982927-x64.msu - gave me an error about incompatibility with my computer, however it totally matches my system. CRC of hotfix was ok. Windows Repair Console found startup errors and fixed those, but this didn't help an issue, even by running chkdsk c: /R from it. http://support.microsoft.com/kb/246026 does not promise anything good. sfc /scannow does not help too. Replaced hard drive by cloning an old one using True Image, repeated all steps above. At the same time, some minor glitches started to appear in my Windows, like side panel and notification area settings are getting reset. Goal is to delete the folder and get rid of Event 55. Sounds like NTFS bug. Please help. This is completely ridiculous.

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• cloning a kvm guest os to a vmdk file

  - by Bond

  I have a production environment where I am having 4 Guest OS running on a Ubuntu server which uses kvm. These OS are in an LVM based setup.I want these Virtual Machines to be in a vmdk format also.Where people would do experiments with these Virtual Machines so this in a vmware environment (or it can be Xen too) would be different from the kvm server.I would not have any control on that other environment so I want to give people vmdk images of these virtual machines. The production Virtual Machines will still keep running on kvm server but the VMs on which experiments would be done would be of type vmdk.(vmdk is a constraint) Here is output of lvscan ACTIVE '/dev/abcd/lvm1' [100.00 GiB] inherit ACTIVE '/dev/abcd/lvm2' [150.00 GiB] inherit ACTIVE '/dev/abcd/lvm3' [50.00 GiB] inherit ACTIVE '/dev/abcd/lvm4' [100.00 GiB] inherit I was reading man page of qemu-img and what I understand is I need to first create a qcow image file which I need to populate and then convert that to a vmdk file. Is that understanding correct? Now suppose /dev/abcd/lvm4 is the virtual machine with which I am going to start this experiment.I can shutdown the production VMs for some time to do this. So is the following way correct to go on server 1 (where kvm is running) qemu-img convert -c -f raw -O vmdk /dev/abcd/lvm4 /backup/lvm4.img or it will affect the lvm4 on kvm server 1. I do not want the VM running on original server to at all loose its any of the content but also have a vmdk file for each of the Guest OS on kvm. Before I proceed with any of the above things on the production machine I just want to make sure that I am doing the correct thing so I asking here.

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• Setup staging with multiple SVN

  - by Kapil Sharma

  We are a startup, setting new environments for product to be released soon. Planned server structure with planned release flow is as shown in below image It ideally have a local server (or Staging server, shown in green) in local office, without public IP address and Production Server (Red) at Amazon EC2. Both local and production server have there own SVN copy. Management here want to update production server with production SVN and without providing its access to developers (including freelancers/contract employees). So for developers, there is a Local SVN on local server. Another purpose of local SVN to keep a copy of code on local server, which is under our direct control. Although there are some technical concerns like how will code at local server will be updated from local SVN and commit on production SVN but bigger question is, is that structure correct? Major requirement remain don't provide production SVN access to developers. What are other possible options to achieve that? Another minor question, if suitable here, if above structure is correct, is it possible for a SVN checkout to get updated from one SVN (Local SVN) but commit to other (Production SVN)? If yes, How? edit An answer has been accepted but for bounty, I'm still looking for answer Is that structure correct? Its pros/Cons? Technical solution is already provided by accepted answer.

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• Some HTTPS connections via NAT fail, but work on firewall itself.

  - by hnxn

  Hi, I am having trouble establishing some HTTPS connections from internal machines, even though these same connections work if initiated on the firewall itself. The firewall machine is running Ubuntu 10.04.1 and shorewall 4.4.6. The internet connection is Bell PPPoE DSL (in Canada). I have tried various MTU settings, it doesn't seem to make any difference. Other protocols (HTTP, FTP, etc) generally work. The problem seems to be limited to certain sites; this one never works from an internal machine, but always works from the firewall itself: From internal machine: $ wget https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif --2011-01-13 20:51:31-- https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif Resolving images.fedex.com... 184.24.96.69 Connecting to images.fedex.com|184.24.96.69|:443... connected. ^C From firewall: $ wget https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif --2011-01-13 20:58:28-- https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif Resolving images.fedex.com... 184.24.96.69 Connecting to images.fedex.com|184.24.96.69|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 840 [image/gif] Saving to: `corp_logo.gif' 2011-01-13 20:58:28 (149 MB/s) - `corp_logo.gif' saved [840/840] This URL always works from both internal and firewall: https://encrypted.google.com/images/logos/ssl_logo_lg.gif Any troubleshooting tips would be greatly appreciated!

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• Adobe premiere CS5 problem with the display driver

  - by user30179

  This error is really hindering our project. I get an error, it started showing-up June 16th 2010. There are no windows updates at the on the same date as the error, other than (Windows Defender) Seems to happen when working with Image overlays. ERROR: "The NVIDIA OpenGL driver detected a problem with the display driver and is unable to continue. The application must close." We opened the side of the case in the possibility there is an over heating problem. Nvidia Driver ver 8.16.11.9175 (nVidia Quadro FX 1700) I am running: Windows 7 x64 Adobe premiere CS5 Production nVidia Quadro FX 1700 (MRGA14L) 4 Gig ram RAID 10 2 750GB drives Duo core 3.0 6MB L2 Cache This is at least three other people that have come across this error: NVidia Forum EVGA Forum NVidia Forum UPDATE: Having the case open did not help. I also installed New Nvidia drivers now I get a different error: *ERROR:*Your hardware configuration does not meet minimum specifications needed to run the application. The application must close. I ran Windows Update and installed all four updates so now I am waiting to see if the error occurs again. Anything beyond this I am out of options.

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• Photoshop CS6 Corrupted File recovery

  - by Ben Franchuk

  Last night I was working on a client application mock-up in photoshop, but was goin to take a break from my work so I saved the .PSD file on my internal HDD and put my computer into stand-by mode once the file had finished saving. Unfortunately my computer crashed while it was entering stand-by and shut itself down (photoshop was still open). I did not boot it again to make sure all my files were ok because they had already been saved, but today once I opened up the file again it was extremely corrupted and also completely un-editable (screenshot bellow). so what im asking is there any way to recover my work, or at least some of it? i have put in a good few days work on this project and would hate to have to restart it. the size of the file is 3070 KB, even though it reads as 712 KB in photoshop. i dont know if these file sizes are larger or either smaller than the original non-corrupted file's size, but considering all the layers in the file i suspect it was larger before it corrupted. im using windows XP professional 32bit SP3. both my OS and said .PSD file are located on the same internal HDD (74.4 GB). i do have an external HDD (1.5 TB) but i primarily only use it for movies music and tv shows. i dont know if it was plugged in t the time of me editing the document last, though, if it means anything. i have tried many image and PSd recovery softwares but none have returned any results that may help recover my work. edit: i tried using a photo reccovery software (odboso Photorecovery) that actually seems to recover the corrupted file in question judging by the size of the file, but i cannot recover it because of the licence fee. knowing that the file is still likely on my HDD, what location might it be located?

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• HTTP responses curl and wget different results

  - by Fab

  To check HTTP response header for a set of urls I send with curl the following request headers foreach ( $urls as $url ) { // Setup headers - I used the same headers from Firefox version 2.0.0.6 $header[ ] = "Accept: text/xml,application/xml,application/xhtml+xml,"; $header[ ] = "text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"; $header[ ] = "Cache-Control: max-age=0"; $header[ ] = "Connection: keep-alive"; $header[ ] = "Keep-Alive: 300"; $header[ ] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7"; $header[ ] = "Accept-Language: en-us,en;q=0.5"; $header[ ] = "Pragma: "; // browsers keep this blank. curl_setopt( $ch, CURLOPT_URL, $url ); curl_setopt( $ch, CURLOPT_USERAGENT, 'Googlebot/2.1 (+http://www.google.com/bot.html)'); curl_setopt( $ch, CURLOPT_HTTPHEADER, $header); curl_setopt( $ch, CURLOPT_REFERER, 'http://www.google.com'); curl_setopt( $ch, CURLOPT_HEADER, true ); curl_setopt( $ch, CURLOPT_NOBODY, true ); curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true ); curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true ); curl_setopt( $ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY ); curl_setopt( $ch, CURLOPT_TIMEOUT, 10 ); //timeout 10 seconds } Sometimes I receive 200 OK which is good other time 301, 302, 307 which I consider good as well, but other times I receive weird status as 406, 500, 504 which should identify an invalid url but when I open it on the browser they are fine for example the script returns http://www.awe.co.uk/ => HTTP/1.1 406 Not Acceptable and wget returns wget http://www.awe.co.uk/ --2011-06-23 15:26:26-- http://www.awe.co.uk/ Resolving www.awe.co.uk... 77.73.123.140 Connecting to www.awe.co.uk|77.73.123.140|:80... connected. HTTP request sent, awaiting response... 200 OK Does anyone know which request header I am missing or adding in excess?

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• Backup solution, or, how Duplicati duped me

  - by blarghmaster

  TL/DR version: Mono + Duplicati.commandline.exe restore etc. etc. spits this out for several files regardless of what I try. I am able to list sets, list files in said sets, even do a verify, but each time i do a restore of any kind, i get errors to the effect of : Failed to restore file: "snapshot/blahblah/2005-11-07.tar.gz", Error message: The partial file record for snapshot/blahblah/2005-11-07.tar.gz does not match the file Any advice here, or an idea of where to look for a better solution? FULL STORY: Ive recently put together an nice clean, friendly backup solution for several servers, predominantly Linux, but occasionally a windows box is added too. The solution as is meets all my requirements and does it well... save 1: cross-compatibility The solution is based on a combination of several elements, but eventually comes done to using Duplicity and Duplicati for the actual storage of files. The entire solution was ready to go before i realized that Duplicati, does not, in fact allow me to restore my files to a Linux box, regardless of what the commandline under Mono might tell you. It just spits out errors on random zip and image files, for apparently no good reason as i have tried several options to get it to restore, and several versions of Mono including installing it pretty much lib-for-lib. There is no effective log file for the reasons for these errors, and even the "--debug-output=true" flag does nothing. I am able to list sets, list files in said sets, even do a verify, but each time i do a restore of any kind, i get errors to the effect of : Failed to restore file: "snapshot/blahblah/2005-11-07.tar.gz", Error message: The partial file record for snapshot/blahblah/2005-11-07.tar.gz does not match the file Now i could most likely use the friendly instructions on Duplicati's site and script a bash equivalent of the restore, but that's not exactly ideal. Any advice on this? or possibly an alternative solution that presents the same benefits of Duplicati/Duplicity but that actually works across platforms?

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• Xen 4.1.2 unable to boot

  - by Devator

  I have installed Xen 3.1.2 perfectly, and it's running fine. However since that version is way outdated I just updated it to 4.1.2 by adding the gitco repository and then yum update. It installed fine, modified my grub.conf to reflect the changes but then on a reboot, it simply doesn't come back online (I can't see what's going on, as it's a rented dedicated server). What are my options? Booting into rescue mode and using the older kernel works fine, it will come back up. But once I use the xen.gz-4.1.2kernel, it won't come back up anymore and I need to use the rescue image.. My /boot/grub/grub.confis as follows: title CentOS (2.6.18-308.1.1.el5xen) root (hd0,1) #kernel /xen.gz-2.6.18-308.1.1.el5 dom0_mem=1024M kernel /xen.gz-4.1.2 module /vmlinuz-2.6.18-308.1.1.el5xen ro root=/dev/md1 module /initrd-2.6.18-308.1.1.el5xen.img When I uncomment the 3.1.2 kernel, it works fine, but booting with the 4.1.2 kernel fails and I have no idea what's going on. Hence my question: what are my options?

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• Replies to request coming over a relay goes to relay's internal IP, not to original request's source IP

  - by seaquest

  Dhcpd running on Linux gets a dhcp request over dhcrelay which is running on other remote machine. Oct 6 10:09:46 2012 dhcpd: DHCPDISCOVER from 00:1e:68:06:eb:37 (oguz-U300) via 172.16.17.81 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes 10:35:01.112500 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: UDP (17), length: 328) 192.168.0.81.67 > 192.168.0.1.67: BOOTP/DHCP, Request from 00:1e:68:06:eb:37, length: 300, hops:1, xid:0xe378fc7e, flags: [none] (0x0000) Gateway IP: 172.16.17.81 Client Ethernet Address: 00:1e:68:06:eb:37 [|bootp] It matches to a subnet and send reply. However reply does not go to the requesting dhcrelay external IP(192.168.0.81). Instead, it goes to the internal interface IP of machine running dhcrelay. And I think because of this remote machine running dhcrelay or the dhcrealy itself discarding packet. Oct 6 10:09:46 2012 dhcpd: DHCPOFFER on 172.16.17.11 to 00:1e:68:06:eb:37 (oguz-U300) via 172.16.17.81 10:35:02.050108 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: UDP (17), length: 328) 192.168.0.1.67 > 172.16.17.81.67: BOOTP/DHCP, Reply, length: 300, hops:1, xid:0xe378fc7e, flags: [none] (0x0000) Your IP: 172.16.17.11 Gateway IP: 172.16.17.81 Client Ethernet Address: 00:1e:68:06:eb:37 [|bootp] Is this a normal behaviour? Machine running dhcrelay: eth1(ext) Link encap:Ethernet HWaddr 00:90:0B:21:43:F4 inet addr:192.168.0.81 Bcast:192.168.0.255 Mask:255.255.255.0 eth2(int) Link encap:Ethernet HWaddr 00:90:0B:21:43:F5 inet addr:172.16.17.81 Bcast:172.16.17.255 Mask:255.255.255.0 3582 ? Ss 0:00 /usr/sbin/dhcrelay -i eth2 192.168.0.1 Machine running dhcpd: eth1 Link encap:Ethernet HWaddr 00:90:0B:23:97:D1 inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0 option domain-name "test.com"; option subnet-mask 255.255.255.0; authoritative; ignore client-updates; ddns-update-style ad-hoc; default-lease-time 86400; max-lease-time 86400; subnet 192.168.0.0 netmask 255.255.255.0 { range 192.168.0.135 192.168.0.169; option broadcast-address 192.168.0.255; option domain-name-servers 192.168.0.1; option domain-name "test.com"; option routers 192.168.0.1; } subnet 172.16.17.0 netmask 255.255.255.0 { local-address 192.168.0.1; server-identifier 192.168.0.1; range 172.16.17.10 172.16.17.11; option broadcast-address 172.16.17.255; option routers 172.16.17.81; } (I put local-address and server-identifier. But this does not help ) Regards, -- Oguz YILMAZ UPDATE: The first problem is found. I have configured dhcrelay only on listening internel interface. It seems (of course) is should also listen to external interface for replies. It appears it is not important where the packet destined to. dhrelay will forward it to internal net. HOWEVER, I have deleted route on dhcpd server to reach 172.16.17.x subnet. It again tries to send reply to 172.16.17.81. Because it does not know the route it send it from default gateway to the internet. eth0: IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto: UDP (17), length: 328) 192.168.1.2.67 > 172.16.17.81.67: BOOTP/DHCP, Reply, length: 300, hops:1, xid:0x32830125, secs:3, flags: [none] (0x0000) eth0: Your IP: 172.16.17.11 eth0: Gateway IP: 172.16.17.81 eth0: Client Ethernet Address: 00:1e:68:06:eb:37 [|bootp] How can I force dhcpd to force to send replies to requesting IP? Because, it is not much meaningful to add routes to subnet we distribute IP for. Internet - dhcpd - 192.168.0.1 - SOMENET - 192.168.0.81 - dhcrelay - 172.16.17.0/24 192.168.0.1 has no route for 172.16.17.0 and has no interface directly attached to that net.

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