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• Thin virtual host

  - by Adam Ryczkowski

  My work setup relies on old Windows XP. Now, when Windows XP isn't supported by new hardware, it's getting harder and harder to buy a notebook on which Windows XP can run natively with all essential hardware (wireless cards, graphics, sound etc). Since I don't expect my personal setup to turn away from Windows XP any time soon, I'm investigating the following trick: why not buy any decent hardware which Linux can fully utilize, and use it as a virtual host for a guest session with e.g. Windows XP. I like using hibernation, so I prefer this Linux to be as thin as possible, only enough to support VirtualBox, KVM or any other virtualization software. Question: Are there any "standard" ways to do this, like Linux distributions aimed specifically on being light virtualization host?

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• Thin virtual host [migrated]

  - by Adam Ryczkowski

  My work setup relies on old Windows XP. Now, when Windows XP isn't supported by new hardware, it's getting harder and harder to buy a notebook on which Windows XP can run natively with all essential hardware (wireless cards, graphics, sound etc). Since I don't expect my personal setup to turn away from Windows XP any time soon, I'm investigating the following trick: why not buy any decent hardware which Linux can fully utilize, and use it as a virtual host for a guest session with e.g. Windows XP. I like using hibernation, so I prefer this Linux to be as thin as possible, only enough to support VirtualBox, KVM or any other virtualization software. Question: Are there any "standard" ways to do this, like Linux distributions aimed specifically on being light virtualization host?

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• J2EE Applications, SPARC T4, Solaris Containers, and Resource Pools

  - by user12620111

  I've obtained a substantial performance improvement on a SPARC T4-2 Server running a J2EE Application Server Cluster by deploying the cluster members into Oracle Solaris Containers and binding those containers to cores of the SPARC T4 Processor. This is not a surprising result, in fact, it is consistent with other results that are available on the Internet. See the "references", below, for some examples. Nonetheless, here is a summary of my configuration and results. (1.0) Before deploying a J2EE Application Server Cluster into a virtualized environment, many decisions need to be made. I'm not claiming that all of the decisions that I have a made will work well for every environment. In fact, I'm not even claiming that all of the decisions are the best possible for my environment. I'm only claiming that of the small sample of configurations that I've tested, this is the one that is working best for me. Here are some of the decisions that needed to be made: (1.1) Which virtualization option? There are several virtualization options and isolation levels that are available. Options include: Hard partitions:  Dynamic Domains on Sun SPARC Enterprise M-Series Servers Hypervisor based virtualization such as Oracle VM Server for SPARC (LDOMs) on SPARC T-Series Servers OS Virtualization using Oracle Solaris Containers Resource management tools in the Oracle Solaris OS to control the amount of resources an application receives, such as CPU cycles, physical memory, and network bandwidth. Oracle Solaris Containers provide the right level of isolation and flexibility for my environment. To borrow some words from my friends in marketing, "The SPARC T4 processor leverages the unique, no-cost virtualization capabilities of Oracle Solaris Zones"  (1.2) How to associate Oracle Solaris Containers with resources? There are several options available to associate containers with resources, including (a) resource pool association (b) dedicated-cpu resources and (c) capped-cpu resources. I chose to create resource pools and associate them with the containers because I wanted explicit control over the cores and virtual processors.  (1.3) Cluster Topology? Is it best to deploy (a) multiple application servers on one node, (b) one application server on multiple nodes, or (c) multiple application servers on multiple nodes? After a few quick tests, it appears that one application server per Oracle Solaris Container is a good solution. (1.4) Number of cluster members to deploy? I chose to deploy four big 64-bit application servers. I would like go back a test many 32-bit application servers, but that is left for another day. (2.0) Configuration tested. (2.1) I was using a SPARC T4-2 Server which has 2 CPU and 128 virtual processors. To understand the physical layout of the hardware on Solaris 10, I used the OpenSolaris psrinfo perl script available at http://hub.opensolaris.org/bin/download/Community+Group+performance/files/psrinfo.pl: test# ./psrinfo.pl -pv The physical processor has 8 cores and 64 virtual processors (0-63) The core has 8 virtual processors (0-7)   The core has 8 virtual processors (8-15)   The core has 8 virtual processors (16-23)   The core has 8 virtual processors (24-31)   The core has 8 virtual processors (32-39)   The core has 8 virtual processors (40-47)   The core has 8 virtual processors (48-55)   The core has 8 virtual processors (56-63)     SPARC-T4 (chipid 0, clock 2848 MHz) The physical processor has 8 cores and 64 virtual processors (64-127)   The core has 8 virtual processors (64-71)   The core has 8 virtual processors (72-79)   The core has 8 virtual processors (80-87)   The core has 8 virtual processors (88-95)   The core has 8 virtual processors (96-103)   The core has 8 virtual processors (104-111)   The core has 8 virtual processors (112-119)   The core has 8 virtual processors (120-127)     SPARC-T4 (chipid 1, clock 2848 MHz) (2.2) The "before" test: without processor binding. I started with a 4-member cluster deployed into 4 Oracle Solaris Containers. Each container used a unique gigabit Ethernet port for HTTP traffic. The containers shared a 10 gigabit Ethernet port for JDBC traffic. (2.3) The "after" test: with processor binding. I ran one application server in the Global Zone and another application server in each of the three non-global zones (NGZ):  (3.0) Configuration steps. The following steps need to be repeated for all three Oracle Solaris Containers. (3.1) Stop AppServers from the BUI. (3.2) Stop the NGZ. test# ssh test-z2 init 5 (3.3) Enable resource pools: test# svcadm enable pools (3.4) Create the resource pool: test# poolcfg -dc 'create pool pool-test-z2' (3.5) Create the processor set: test# poolcfg -dc 'create pset pset-test-z2' (3.6) Specify the maximum number of CPU's that may be addd to the processor set: test# poolcfg -dc 'modify pset pset-test-z2 (uint pset.max=32)' (3.7) bash syntax to add Virtual CPUs to the processor set: test# (( i = 64 )); while (( i < 96 )); do poolcfg -dc "transfer to pset pset-test-z2 (cpu $i)"; (( i = i + 1 )) ; done (3.8) Associate the resource pool with the processor set: test# poolcfg -dc 'associate pool pool-test-z2 (pset pset-test-z2)' (3.9) Tell the zone to use the resource pool that has been created: test# zonecfg -z test-z1 set pool=pool-test-z2 (3.10) Boot the Oracle Solaris Container test# zoneadm -z test-z2 boot (3.11) Save the configuration to /etc/pooladm.conf test# pooladm -s (4.0) Results. Using the resource pools improves both throughput and response time: (5.0) References: System Administration Guide: Oracle Solaris Containers-Resource Management and Oracle Solaris Zones Capitalizing on large numbers of processors with WebSphere Portal on Solaris WebSphere Application Server and T5440 (Dileep Kumar's Weblog)  http://www.brendangregg.com/zones.html Reuters Market Data System, RMDS 6 Multiple Instances (Consolidated), Performance Test Results in Solaris, Containers/Zones Environment on Sun Blade X6270 by Amjad Khan, 2009.

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• How to create a virtual audio device and stream audio input with it

  - by Steven Rosato

  Is it possible to create another audio device and redirect only wanted input streams to it? Here's my concrete problem: I am broadcasting a game via XFire and it uses the Windows audio device to capture any audio I receive. As I am broadcasting, other users who watch the video stream are communicating with me over Skype, and they hear themselves back within the video stream and it is entirely logical since I am broadcasting the audio I hear. What I want to do is create another audio device within Windows and redirect (pipe) ONLY the audio input from that game and not the input reveived from Skype. I would then tell XFire to use that newly created "virtual" audio device to broadcast and therefore my partners won't hear themselves back. Is there any software that can do that or can it be achieved natively with Windows? (I am under Windows 7).

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• Apache virtual host for drupal test site

  - by bsreekanth

  Hello, I am a programmer, trying to launch my first website.. through different helpful posts in sf and others, I setup an account with Linode and set up a slice (Debian, Apache, ..etc). I have a Drupal site under development, and like to have a test site in the Linode server as well. Now, I like to have a site setup with the following requirement. What is the best way to setup and protect the test site along with the actual (production) site?. Is virtual host is the answer? To protect the test site, is .htaccess authentication sufficient to prevent access from public and robots? I also modifying the theme, database contents etc, so having two sites under one drupal installation may not be good idea . what do u suggest? thanks in advance. bsreekanth.

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• Testing Tomcat with Virtual Hosts

  - by Marty Pitt

  I'm trying to test Tomcat virtual hosts on my dev machine (windows 7/Tomcat 6). I'd like to have requests for localhost, test1.localhost and test2.localhost all route through to the same tomcat instance. I've edited my hosts file to look as follows: 127.0.0.1 localhost ::1 localhost 127.0.0.1 test1.localhost 127.0.0.1 test2.localhost And added modified the Engine in server.xml as follows: <Engine defaultHost="localhost" name="Catalina"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase" /> <Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true" xmlNamespaceAware="false" xmlValidation="false"> <Alias>test1.localhost</Alias> <Alias>test2.localhost</Alias> </Host> </Engine> However, I'm getting a 404 when hitting test1.localhost:8080/myWebApp, although localhost:8080/myWebApp works fine. I can ping test1.localhost fine. What have I missed?

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• MSSoap 3.0 Error while creating Virtual Directory with SOAPVDIR.CMD

  - by BenjaminPaul

  I am trying to install a web service (written in FoxPro) onto a newly configured server. Part of the installation process was to install MSSoap 3.0 which seems to be successful. The server OS is Microsoft Server 2008 R2 (x64). I am now trying to create a virtual directoty at the command prompt using the SOAPVDIR.CMD script and I am getting the following error: CMD> SOAPVDIR.CMD CREATE CSLRosterService "C:\ROSTERWS" CMD> ERROR (0x80070002): Soap Toolkit 3 Isapi is not correctly registered. Does anyone know how I can correct this or what I am doing wrong?

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• Cannot connect to xdebug over virtual network - Vagrant Virtualbox

  - by smix96

  I'm trying to set up a development box using Virtualbox / Vagrant / Puppet with the intention of eventually provisioning all my machines up to production. However this is stopping me going forward at the moment. I've installed ubuntu lucid over windows 7. When trying to connect to xdebug by starting a debugging session in eclipse, it hangs at 57% (common in eclipse when it cannot communicate with xdebug). Here is my xdebug.ini and the settings here are appearing in phpinfo(). xdebug.remote_enable=On xdebug.remote_handler=dbgp xdebug.remote_host=192.168.56.1 xdebug.remote_port=9000 I'm now wondering if it's an issue with port forwarding? If eclipse is looking on port 9000, will it find port 9000 on a virtual machine? Any help would be greatly appreciated!

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• Virtual machine won't connect to networking interface

  - by Keyo

  I have moved my virtual box hard drive (.vdi file) from windows7 on a laptop, to windows7 on a desktop. No big deal I thought. The OS is ubuntu 10.10. Now networking is broken. I don't have a solid understanding of windows networking, maybe someone can help. Anyway, the networking no longer works. I've tried to setup eth0. I have virtualbox setup in bridge mode, my wifi connection on windows to an intel card on the virtualbox side. I think it might be something to do with windows not allowing the connection to bridge properly (security issues). I've provided some screenshots, which will hopefully help.

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• Drupal Query builder

  - by Rimian

  I quite often use Drupal's Views Module to build SQL that I paste into my code. It understands the Drupal database schema quite well. Is there a module that would give me this functionality or can I factor this out of Views?

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• Dovecot Virtual Users and Users Domain Mapping

  - by Stojko

  I have successfully compiled, configured and ran Dovecot with virtual users feature. Here's part of my /etc/dovecot.conf configuration file: mail_location = maildir:/home/%d/%n/Maildir auth default { mechanisms = plain login userdb passwd-file { args = /home/%d/etc/passwd } passdb passwd-file { args = /home/%d/etc/shadow } socket listen { master { path = /var/run/dovecot/auth-worker mode = 0600 } } } I faced one issue I can't resolve myself. Is there anyway to create users' domains mapping and provide username in mail_location? Examples: 1. currently I have /home/domain.com/user/Maildir 2. I'd like to have /home/USER/domain.com/user/Maildir Can I achieve this somehow? Greets, Stojko

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• Flex Builder Bandwidth profiling

  - by Fahim Akhter

  Hi, I was trying to find a bandwidth profiler in flex like there used to be one in Flash but couldn't really find one. Is there a way, that I can do bandwidth profiling of my local swf? I'm using Flex Bulider with a AS3 project.

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• Apache2 alias in virtual host

  - by 0x7c00

  I have multiple virtual host in one server and plan to has some alias setup in one virtualhost. So I add the Alias /foo/ /path/to/foo/ in virtualhost directive,but it has no effect. request of host1/foo/ will return 404. But if I add this to /etc/apache2/mods-available/alias.conf, it works. But the problem is host2 will also share this alias. Is there a way to make the alias work only for host1? B.T.W, I use apache2ctl -l, there's no mod_alias.c listed, weird.

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• Migration of virtual Maschines

  - by Friedrich

  I wonder if there are tools for migrating from one virtual machine type to another. E.g let's say I have some Xen virtual maschine and like to make it run under KVM. I know that e.g in qeumu are tools which can be used to "migrate" such machines but how about e.g Xen - Kvm Kvm - Xen Xen - Vmware (server?)

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• Installing Java on a Virtual Private Server

  - by Martin Rowe

  I have recently managed to get my employer to pay for a vps. I teach and asked the vps provider to enable Perl, Python, Ruby, Tomcat and Java. They've done the first four (really quickly) but have got back to me asking which parts of Java I need. I think the Java Virtual Machine is a given but what other S/W do I need to get installed? I think by getting the vps I now have the chance to teach Enterprise Java and want to get into Java Message Server and Enterprise patterns. Can I get Glassfish installed or is that a silly question? What about servlets and beans? Thanks in anticipation Martin Rowe

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• MacOS Virtual Input Devices

  - by computergeek6

  How can I create a virtual HID device in code? I'm trying to avoid writing a kernel extension to accomplish this, but it seems to be the only way. I need to be able to create virtual HID devices of all types, and have an app running in the background feed them events. Is there a way to do this in user-space, or must I venture into kernel land?

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• Most optimized way to calculate modulus in C

  - by hasanatkazmi

  I have minimize cost of calculating modulus in C. say I have a number x and n is the number which will divide x when n == 65536 (which happens to be 2^16): mod = x % n (11 assembly instructions as produced by GCC) or mod = x & 0xffff which is equal to mod = x & 65535 (4 assembly instructions) so, GCC doesn't optimize it to this extent. In my case n is not x^(int) but is largest prime less than 2^16 which is 65521 as I showed for n == 2^16, bit-wise operations can optimize the computation. What bit-wise operations can I preform when n == 65521 to calculate modulus.

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• Virtual DNS recommended setup...

  - by luison

  Hi. We are new to virtualization which we are setting up with Proxmox VE (OpenVZ + KVM). I am a bit lost about the recommended DNS forwarder config specially in the OpenVZ (Virtuosso type) of enviroiment. Our intention was to have a small dnsmasq running in one of the VM acting as backup DHCP server and serving our in-office local addresses (and PCs) by an additional resolve.conf file which dnsmasq supports, but I've read that all VM should share DNS pointing to the host machine in which case it would make more sense having it there. My problem is that I would like to have as least as possible apps in the host so a reinstall of the environment (porxmox ve) and a machine restore can be as quick as possible. Does anyone have a similar setup? Does it make sense to have the 1st virtual machine running the local dns forwarder? Also... dnsmasq seems to want to have root permissions when running on an OpenVZ container... are there any work arrounds anyone knows for that.

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• Singleton class in DLL used on multiple virtual directories

  - by Drejc

  I have the following situation: multiple virtual directories under same application pool in IIS copy of same DLL in all those directories (same version number) a singleton class in one in this DLL The question is, is this singleton class created only once for all those Virtual Directory instances or is there for each of there one singleton class. The code looks something like this: [ Transaction(TransactionOption.Supported), ClassInterface(ClassInterfaceType.AutoDispatch), Guid("7DE45C4D-19BE-4AA4-A2DA-F4D86E6502A8") ] public class SomeClass { private static readonly Singleton singleton = new Singleton();

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• Load balance between two virtual directories on a single machine running IIS6

  - by Emil Lerch

  I'm trying to simulate a production environment using a single VM. The production environment will have 3 servers behind a load balancer with sticky sessions. Production will be using IIS6. For development, I have no need to distribute load, but I want to make sure the team does not write code that relies on a single-server module. I have been hoping to set up two virtual directories and find some isapi filter to perform some rudimentary software load balancing, but I've been unable to locate anything suitable. isapi_rewrite comes close but there's no ability for a random rewrite. I don't even need sticky sessions since the application does not (in theory) rely on them. Is there something easy/free to do this, or am I stuck with multiple VMs and a NLB setup (which seems like total overkill)?

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• Execute code on assembly load

  - by Dmitriy Matveev

  I'm working on wrapper for some huge unmanaged library. Almost every of it's functions can call some error handler deeply inside. The default error handler writes error to console and calls abort() function. This behavior is undesirable for managed library, so I want to replace the default error handler with my own which will just throw some exception and let program continue normal execution after handling of this exception. The error handler must be changed before any of the wrapped functions will be called. The wrapper library is written in managed c++ with static linkage to wrapped library, so nothing like "a type with hundreds of dll imports" is present. I also can't find a single type which is used by everything inside wrapper library. So I can't solve that problem by defining static constructor in one single type which will execute code I need. I currently see two ways of solving that problem: Define some static method like Library.Initialize() which must be called one time by client before his code will use any part of the wrapper library. Find the most minimal subset of types which is used by every top-level function (I think the size of this subset will be something like 25-50 types) and add static constructors calling Library.Initialize (which will be internal in that scenario) to every of these types. I've read this and this questions, but they didn't helped me. Is there any proper ways of solving that problem? Maybe some nice hacks available?

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• "Catch-All" access log with Apache Virtual Hosts?

  - by pix0r

  I have many virtual hosts set up on a web server, each one having its own error and access log. The relevant lines of httpd.conf are something like this: ErrorLog /var/log/httpd-error.log LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined CustomLog /var/log/httpd-access.log combined NameVirtualHost *:80 <VirtualHost *:80> ServerName myhost.com ServerAlias www.myhost.com DocumentRoot /var/www/myhost.com/htdocs ErrorLog /var/www/myhost.com/log/error.log CustomLog /var/www/myhost.com/log/access.log combined </VirtualHost> # ... many more VirtualHosts Currently, I'm getting some random errors in /var/log/httpd-error.log, but I'm getting nothing in /var/log/httpd-access.log. Is it possible to have ALL accesses and errors duplicated to a shared logfile? Is it possible to do this without adding new entries to every single VirtualHost?

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• Cannot connect to a 2008 sql server named instance hosted in a azure virtual machine

  - by emardini

  When I try to connect to a named instance in a SQL SERVER hosted in a azure VM I get this message: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) The problem is the sql browser is not working properly, when I start the sql browser service it closes after a few seconds and the event log says "There are no instances of SQL Server or SQL Server Analysis Services." But I do have a named instance, I can connect locally to this instance. I've re-installed sql browser and the instance but ii does not work. The host is a azure virtual machine windows server 2008 datacenter. Please help. Thank you

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• Wrong assembly-references for Silverlight Sketchflow project in Blend 3

  - by persistent

  Hello, In my installation of Blend 3, the SketchStyles are missing when a new project is created. I found out that this is because the following automatic references in the project are wrong: Microsoft.Expression.Interactions Microsoft.Expression.Prototyping.Interactivity Microsoft.Expression.Prototyping.RunTime Microsoft.Expression.Prototyping.SketchControls In the project references these all point to my project path (where they don't live). If I remove them manually, and instead set the references to ie this: "c:\Program Files (x86)\Microsoft SDKs\Expression\Blend 3\Interactivity\Libraries\Silverlight\Microsoft.Expression.Interactions.dll" everything works. Any ideas on why, and how to fix this? Could it be the project template somehow? TIA

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• flex builder datagrids formatting

  - by robert

  is there a way to control the text positioning in the datagrid cells in Flex so that all text in subsequent columns align on the same rows?

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