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• XenServer Converting HVM to Paravirtualised

  - by Karl Kloppenborg

  Recently I have been tasked with the daunting process of converting a setup of HVM enabled VMs (running on Citrix XenServer 5.6.0) into PV (paravirtualised) containers. The constraints of the project was that: The operating system must be functionally identical after the migration. minimal modification to the operating system (with exception of kernel / drive mapping) I also was allowed to change the bootloader(ie, grub) in what ever way I see fit. However, I have attempted this, I will firstly like to show you my steps I took. This at the moment is CentOS5.5 specific: Steps: yum install kernel-xen This installed: 2.6.18-194.32.1.el5xen edited: /boot/grub/menu.lst changed my specs to match: title CentOS (2.6.18-194.32.1.el5xen) root (hd0,0) kernel /vmlinuz-2.6.18-194.32.1.el5xen ro root=/dev/VolGroup00/LogVol00 console=xvc0 initrd /initrd-2.6.18-194.32.1.el5xen.img Then I changed my xenserver parameters to match: xe vm-param-set uuid=[vm uuid] PV-bootloader-args="--kernel /vmlinuz-2.6.18-194.32.1.el5xen --ramdisk /initrd-2.6.18-194.32.1.el5xen.img" xe vm-param-set uuid=[vm uuid] HVM-boot-policy="" xe vm-param-set uuid=[vm uuid] PV-bootloader=pygrub xe vbd-param-set uuid==[Virtual Block Device/VBD uuid] bootable=true Some things to note, I am running a VolGroup LVM ;) Anyways, after all these steps (which aren't much!) I boot the VM and it boots initial kernel just fine, however I am presented with this error: Boot Screen: device-mapper: dm-raid45: initialized v0.2594l Waiting for driver initialization. Scanning and configuring dmraid supported devices Scanning logical volumes Reading all physical volumes. This may take a while... Activating logical volumes Volume group "VolGroup00" not found Creating root device. Mounting root filesystem. mount: could not find filesystem '/dev/root' Setting up other filesystems. Setting up new root fs setuproot: moving /dev failed: No such file or directory no fstab.sys, mounting internal defaults setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory Now my hints are that it cannot detect / because of the fact that when you change from HVM mode to PV it does something (not that obvious) When you make a SR (storage) on a HVM, you get it mounted to the guest os as /dev/hda. However in PV mode, this presents itself as /dev/xvda... Could this be the answer? and if so, how the heck to I implement it?? Update: So I have gotten a bit further in my quest, as it now detects the LVM's... To do this, I required to recompile the xen-kernel initrd image. Command: mkinitrd -v --builtin=xen_vbd --preload=xenblk initrd-2.6.18-194.32.1.el5xen.img 2.6.18-194.32.1.el5xen Now when I boot I get this: Boot Screen: Loading dm-raid45.ko module device-mapper: dm-raid45: initialized v0.2594l Scanning and configuring dmraid supported devices Scanning logical volumes Reading all physical volumes. This may take a while... Found volume group "VolGroup00" using metadata type lvm2 Activating logical volumes 3 logical volume(s) in volume group "VolGroup00" now active Creating root device. Mounting root filesystem. mount: error mounting /dev/root on /sysroot as ext3: Device or resource busy Setting up other filesystems. Setting up new root fs setuproot: moving /dev failed: No such file or directory no fstab.sys, mounting internal defaults setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory Kernel panic - not syncing: Attempted to kill init!

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• VMWare esxi 4.1 storage errors with MD3200

  - by Karl Katzke

  We're seeing some storage errors from the esxi logs relating to our MD3200. I'm sort of a VMWare noob and am not sure where to go from here because I couldn't find a lot of documentation on the VMWare website, and the forums didn't seem to have any posts about it with actual answers. Everything is working, but I'm trying to proactively troubleshoot this. sfcb-vmware_base|StoragePool Cannot get logical disk data from controller 0 sfcb-vmware_base|Volume Cannot get logical disk data from controller 0 sfcb-vmware_base|storelib-GetLDList-ProcessLibCommandCall failed; rval = 0x800E The ESXi boxes are connected directly via SAS to the controller on the MD3200. What do these errors actually mean, and what's a good path to start troubleshooting or solving them?

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• What is the public key file that is generated by PuTTY?

  - by Karl Nicoll

  If I'm using the PuTTY key generator to create a public/private key pair, there is a button to "Save public key" like so: However OpenSSH doesn't accept the format of this public key file, at least as far as I can tell. The generated public key looks like this: ---- BEGIN SSH2 PUBLIC KEY ---- Comment: "rsa-key-20140607" AAAAB3NzaC1yc2EAAAABJQAAAQEAs+UjC01Fk8xs8vpLW1RIipwxG1zXTaCkIdeJ K3SyhMVl78/QwErTYuIop3wVmVAuTKhw4uYCMaRZCy36FdSGQ9FwDCP+lT36M2Xv ZtraweH+1IPHzRf2ENNdEfs286zllu96WGtqLYwObXQbHMm3dPDDbH3apynrS/FJ HisCayFXFN84aBfh9HFHrM++BXqpxTX5nq50QoRwSjMY6qMuLwjJKKQslcb5hlRV SjCmUZKv9/fH+i0BI7UHJ01XHNp1sisL5biWkakXD9BxXjv/ggyeLsOTtdtrF0DK 7wYQXyNmpRqHYOBdrZlskHf/R1CtWoBi5IIeARWZVDduXf1Pww== ---- END SSH2 PUBLIC KEY ---- (Key is not an actual public key) Where is this key used typically? Does it work with OpenSSH at all?

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• How to use File History with Recovery partition?

  - by Karl

  I formatted the recovery partition right after installing Windows 8. I'm curious as to why File history only allow the use of external HDD. Instead of using the Recovery Partition. I can't find a way to use it. I decided to use it exclusively for Restore Points. Is there any way to make the Recovery Partition exclusively for the use of File History? Or should I use 3rd Party programs instead, (Easeus Todo Backup, Macrium Reflect, etc)?

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• How to embed a shell and browser into a presentation?

  - by Karl Bielefeldt

  I am responsible for demonstrating changes to our software every two weeks. Since the software has both telnet and web interfaces, I think it would help the demo go more smoothly if I could embed a web browser and a telnet client or shell directly into presentation slides, like this: My current idea is to write extensions for LibreOffice to do it, but obviously I don't want to reinvent the wheel if I can help it. Does anyone know of a way to accomplish this? I prefer PowerPoint 2007 or LibreOffice on Windows 7, but am open to suggestions for any software or OS.

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• How do I troubleshoot a server I can't get logged into?

  - by Karl

  This morning I am unable to log into SQL Server because it appears to be busy doing something, so much so that CPU usage is constantly at 98%-99%. I am guessing that something has gone wrong with the maintenance plan that ran over the weekend, but I can't get into the error logs see what is happening. On logging in I keep getting messages like "insufficiently memory in the buffer pool" and "the server is not responding". Is there any way I can figure out what is happening without logging onto to the server? Or some way I can squeeze in a login?

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• Ways to setup a ZFS pool on a device without possibility to create/manage partitions?

  - by Karl Richter

  I have a NAS where I don't have a possibility to create and manage partitions (maybe I could with some hacks that I don't want to make). What ways to setup multiple ZFS pools with one partition each (for starters - just want to use deduplication) exist? The setup should work with the NAS, i.e. over network (I'd mount the images via NFS or cifs). My ideas and associated issues so far: sparse files mounted over loop device (specifying sparse file directly as ZFS vdev doesn't work, see Can I choose a sparse file as vdev for a zfs pool?): problem that the name/number of the assigned loop device is anything but constant, not sure how increasing the number loop device with kernel parameter affects performance (there has to be a reason to limit it to 8 in the default value, right?)

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• Restore Windows 7 Upgraded Computer

  - by Karl

  I have a laptop that came with Windows Vista and I purchased an upgrade to Windows 7. I upgraded the computer to Windows 7. Now I am selling my laptop and would like to restore the laptop to Windows 7 original without my files. I would also need to wipe all partitions as I dual booted Ubuntu on another partition. How do I preserve my license? What are the steps I need to take? Thank you superusers for your help!

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• Images as links bad for SEO?

  - by Karl

  I am just about finished with my website and my as I was reading over Google's SEO information, they mentioned images as links without text is bad. What if it is simply a link to enlarge the picture? such as the following: <a href="images/image1.jpg"><img src="images/image1.jpg" height="200" width="100"></a> Any help on this would be great! Thanks, -K

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• PHP mail() function stopped working on Windows 2008 R2 IIS 7.5. Why?

  - by Karl

  PHP 5.3.13 and as noted IIS 7.5. PHP mail() was working fine until I did 3 things (at the same time). (a) added memory to the server taking it from 4gb to 5gb; (b) ran Windows Update and applied all available updates; (c) removed SQL server installation. Windows 2008 R2 SMTP server still works fine. I know this because I can drop a file in the pickup folder and the mail is delivered. This PHP test script: <?php $to='my_name@another_domain.com'; $subject='Test email using PHP'; $message='This is a test email message'. "\r\n"; $headers='From:[email protected]' . "\r\n" . 'Reply-To:[email protected]' . "\r\n" . 'X-Mailer: PHP/' . phpversion(); mail($to, $subject, $message, $headers, '[email protected]'); ?> creates this entry in the PHP log file: mail() on [C:\www\pgs.com\store\admin\test_php_mail.php:1]: To: my_name@another_domain.com -- Headers: From:[email protected] Reply-To:[email protected] X-Mailer: PHP/5.3.13 PHP's mail.log. When using PHP now, I never see a file dropping on the IIS pickup folder. And on other thing, when using previouly working features on the site (such as password recovery), there is no entry made in the mail.log. (The mail log has just been setup to help solve this problem.) How do I fix this? Or at least how do I diagnose the problem? Thanks.

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• How to get stable WIFI connection between phone and router when thousands of irrelevant phones are around?

  - by Karl

  I want to use Android phones to check tickets at the gate of an event. These phones are connected to a password protected router (WPA2) and a PC to validate. That all works nicely in a test setting, but I'm worried it might collaps if there are many other competing phones around. How can I get a stable WIFI connection between my phones and my router when thousands of irrelevant phones are around? Do the other phones clogg the router with requests even when the router is password protected? Shall I hide the SSID?

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• How to achieve maximum callback throughput with WCF duplex channels

  - by Schneider

  I have setup a basic WCF client/server which are communicating via Named pipes. It is a duplex contract with a callback. After the client "subscribes", a thread on the server just invokes the callback as quickly as possible. The problem is I am only getting a throughput of 1000 callbacks per second. And the payload is only an integer! I need to get closer to 10,000. Everything is essentially running with default settings. What can I look at to improve things, or should I just drop WCF for some other technology? Thanks

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• How to disable authentication schemes for WCF Data Services

  - by Schneider

  When I deployed my WCF Data Services to production hosting I started to get the following error (or similar depending on which auth schemes are active): IIS specified authentication schemes 'Basic, Anonymous', but the binding only supports specification of exactly one authentication scheme. Valid authentication schemes are Digest, Negotiate, NTLM, Basic, or Anonymous. Change the IIS settings so that only a single authentication scheme is used. Apparently WCF Data Services (WCF in general?) cannot handle having more than once authentication scheme active. OK so I am aware that I can disable all-but-one authentication scheme on the web application via IIS control panel .... via a support request!! Is there a way to specify a single authentication scheme on a per-service level in the web.config? I thought this might be as straight forward as making a change to <system.serviceModel> but... it turns out that WCF Data Services do not configure themselves in the web config. If you look at the DataService<> class it does not implement a [ServiceContract] hence you cannot refer to it in the <service><endpoint>...which I presume would be needed for changing its configuration via XML. P.S. Our host is using II6, but both solutions for IIS6 & IIS7 appreciated.

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• TeamCity forgotten admin password - where to look?

  - by Schneider

  I need to recover/reset the admin password for JetBrain's TeamCity. I have full RDP access to the server so no problems there. It's just been 2 months since we used it so now I have forgotten my login - my usual ones don't work. It is setup without a database at the moment, so was hoping the usernames would just be in a file somewhere, but no luck finding it so far.

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• Extending WCF Data Service to synthesize missing data on request

  - by Schneider

  I have got a WCF Data Service based on a LINQ to SQL data provider. I am making a query "get me all the records between two dates". The problem is that I want to synthesize two extra records such that I always get records that fall on the start and end dates, plus all the ones in between which come from the database. Is there a way to "intercept" the request so I can synthesize these records and return them to the client? Thanks

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• Why is WPFToolkit DataGrid so slow when binding?

  - by Schneider

  I have a very simple test application where I have two objects, each with a small collection of items. when I select an object I display its collection in a WPFToolkit DataGrid. The problem is there is a noticeable delay, such that if you press up/down keys to toggle selection between objects you can see it can't keep up. Why is the performance so bad? <Window x:Class="SlowGridBinding.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" Title="MainWindow" Height="350" Width="525"> <StackPanel> <ListBox ItemsSource="{Binding Shops}" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True"/> <Controls:DataGrid ItemsSource="{Binding Shops/Vegetables}" AutoGenerateColumns="True"/> </StackPanel> The DataContext is populated with some test classes filled with 50 items of random test data.

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• Where does the version number come from?

  - by Robert Schneider

  I have a version control system (e.g. Subversion) and now I'd like to set up a build process. Now I have to create a version number and insert it into the system. But where does the version number come from and get into? Assume I want to use this common <major.<minor.<bugfix/revision scheme. Should I pass a number to the build script? Or should I pass arguments like increaseMajor, increaseMinor, increaseRevision? Or would you recommend to create a branch with the number which will be detected by the build script? I could imagine that the major and minor version number have to be put in manually somewhere. The revision number could be increased automaically. But still I don't know where I would place the major and minor number. In my case I have some php files that I would like to zip, but before I have to insert some version numbers into php file. I have edited this post to try to make my request clearer: I do not use Subversion, that was just an example. And I don't want to discuss the version number scheme. Imagine I want to create version 3.5.0 or 3.5.1. Would I pass this version number to a build script? Would the script create the branch in the repository with this number or would it expect that someone has already created this branch? Manually? Or would the build script look for name of the branch (e.g. '3.5.1) and use it for further things? And does the version number come from my brain or is it automatically created (I guess the major/minor number it comes from my little brain and revision number is created)? Or would you place the number into a file that may gets inserted into the repository? I guess if would use a release management tool I would insert the version number there. But I don't use one yet.

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• Project files into RCS or not?

  - by Robert Schneider

  In our company we have a discussion whether to put project files into our RCS. What do you think? Consider an Eclipse project file for a C project that contain source and make files and other things. Would you put it into RCS?

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• Mercurial server on Windows using ActiveDirectory for authentication

  - by Joe Schneider

  I'm running Mercurial's hgwebdir.cgi on WinXP over IIS as a central repo for sharing code with my team. I'd like to use ActiveDirectory to authenticate to the server when pushing/pulling through TortoiseHg and/or the command-line hg client. Has anyone done this or seen instructions on how to do this?

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• Project with multiple binaries in Eclipse CDT

  - by Robert Schneider

  I think it is quite normal to have more than one binary in a project. However, with Eclipse CDT I don't know how to set up the IDE to get things done. I know I can create several projects - one per binary. And I know I can set the dependencies per project. However, I cannot regard them as one project in Eclipse. If I'd like to share the code with a version control system (like svn), each developer has to import the projects separately. What I miss is something like the Solution (sln file) in Visual Studio. Should I create a single project and create the make files by myself? I haven't tried it out yet, but there is this 'project set' which can be ex- and imported. Is this the solution? Can this be put into version control? My goal it to put everything under version control, not only subprojects. I cannot imagine that CDT makes only sense for single-binary applications. How can I work properly?

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• Win32 API P-Invoke to bring a disk online, offline, and set unique ID

  - by Andy Schneider

  I am currently using Diskpart to accomplish these functions, but i would like to be able to use P-Invoke and not have to shell out to an external process in my C# app. The example Diskpart scripts are: //Online a disk Select disk 7 disk online // Reset GPT Identifier select disk 7 UNIQUEID DISK ID=baf784e7-6bbd-4cfb-aaac-e86c96e166ee I tried searching pinvoke.net but could only find functions that dealt with volumes, not disks. Any idea on how to accomplish these diskpart commands using Pinvoke?

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• Looking to write a Tag class

  - by Austin Schneider

  I'm looking to write a Tag class (a tag is a string with no spaces). My first thought is to inherit from String: class Tag < String def initialize(str) raise ArgumentError if str =~ /\s/ super end end Does this look correct? Are there any other methods I should redefine?

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• How to intercept WCF errors on the client side

  - by Schneider

  On the server side there is IErrorHandler etc. On the client, exceptions are thrown when you call the methods on the channel. Is there a way to intercept the exceptions on the client before they are throw during invocation of method?

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• How to use Dependency Injection with ASP.NET

  - by Schneider

  I am trying to work out a way to use Dependency Injection with ASP.NET controls. I have got lots of controls that create repositories directly, and use those to access and bind to data etc. I am looking for a pattern where I can pass repositories to the controls externally (IoC), so my controls remain unaware of how repositories are constructed and where they come from etc. I would prefer not to have a dependency on the IoC container from my controls, therefore I just want to be able to construct the controls with constructor or property injection. (And just to complicate things, these controls are being constructed and placed on the page by a CMS at runtime!) Any thoughts?

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• Which management tools would you recommend for software development?

  - by Robert Schneider

  What would you generally recommend for software developement? Which combination do you use or would you recommend? I assume that tools are needed for Version control, issues/bugs/task, Release management, Requirement management. Tools for Test management and Project management should be accounted for as well, I guess. Did I forget anything? Maybe tools for Continous Integration. I'm not interested in a halfway combination of one ore two tools like a Subversion + Bugzilla (I know they are good but for a company they might not be sufficient). And also tools like make/ant shouldn't be taken into account. I'd like to know a combination that covers all what is important for professional software development. However, it could be a single tool of course if it covers all the management issues. What do you think would be a good combination? I assume a combination should be regardes as good if the tools itself are good but also if they have good integrations. Udate: Something like Ant is just a script not a management tool. Okay: we do already have Perforce. But this is somehow generic. We have different projects that uses C-, VS/.NET-, Python-, PHP and we will be starting new projects in Java. Plenty of languages and frameworks, though some are going to be legacy. So the tools should be generic. Obviously we don't want to use Bugzilla for one project and Jira for another. The management tools have to be generic. Further thoughts: Think of sourceforge: For each project they offer a version control system, an issue tracker, a wiki, ... totally independent of what the project is about. Those are some management tools that a project usually needs. I would say that most companies need such a set of tools. But I could imagine, if a company has several projects, they need further tools too: for Project management, Quality management, ... And I could imagine there are some recommendable combinations of tools. A not really apropiate comparison to this could be LAMP (Linux, Apache, MySQL, PHP). A combination of software that has evolved since they work very well together, and are pretty useful for a lot of applications (or rather web sites). So maybe there are some recommendable management tool combinations that also fit toghether like LAMP. The integration is important. Thank you for the incredibly fast and helpful responses!!!

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