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How do I change the document root of a Linux Apache server?

- by Daryl Spitzer

I'm trying to learn how to configure an Apache HTTP server (with which I have no experience) someone else has setup in a VM running Ubuntu 8.04. I know the server is running, since I get "<html><body><h1>It works!</h1></body></html>" when I go to http://1.2.3.4/ (where 1.2.3.4 is the VM's IP number). I found apache2.conf and httpd.conf (among other files) in /etc/apache2/. httpd.conf is empty. I tried adding DocumentRoot "/home/username/temp" into /etc/apache2/httpd.conf and put some simple HTML in /home/username/temp/index.html. But when I reload http://1.2.3.4/ there's no change. Do I need to restart httpd to get it to accept the change to DocumentRoot?

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Crystal Report deployment error

- by Gold

i have C# program that works with Oracle 11g when it works on my computer all works excellent but when its run on the customer computer - the connection to Oracle work good but when i try to run any Crystal-Report i get this error: Could not load file or assembly CrystalDecisions.windows.forms.version = 10.5.3700.0. culture = neutral.publicKey Token = 69fbea5521e1304 or one of its dependencies. The system cannot find the specified thank's for any help

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Is there anything as good as TOAD for Postgres (Windows)?

- by misc090912

Hi guys, I'm just looking for a management tool like TOAD for Postgres. Anyone used a good one? Edit - I work mostly within the data itself and the database already has a mature model/design. I use the edit windows the most (well, in TOAD for Oracle anyway.) As far as I know, Toad only exists naturally for: Oracle, MS SQL, DB2 and MySQL... --JS

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Debian date jumping, causing complete lockup

- by artfulrobot

I have a Debian Squeeze VM that has suddenly chosen to jump it's date forwards just over a month, which seems to confuse it no end and cause it to require a hard reset (yikes!). There is nothing unusual in the logs, except that the datestamp suddenly jumps (today back to 2005). It's happened three times, so I don't think it's to do with the leap second issue as the last one of those was in July. When it happened once I spent ages checking stuff but could not find anything, decided to forget it. But three times is becoming an issue on a production server. Edits providing information requested in comments (thanks!): I do not have control over the hypervisor, it is a hired VM. # cat /sys/devices/system/clocksource/clocksource0/current_clocksource kvm-clock # ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== +grendel.exizten 130.149.17.8 2 u 29 64 77 14.811 1.778 1.744 *panoramix.linoc 193.67.79.202 2 u 32 64 77 19.729 -0.419 1.691 +robert.elnounch 213.251.128.249 2 u 27 64 77 17.762 0.600 1.722 -janetzki.eu 83.169.43.165 3 u 31 64 77 27.214 3.575 1.638

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Entity framework : [Set all the entities with internal access specifier]

- by Vedaantees

Hi, By virtue of my application, I need to seperate my business entities from the entities created by EF4. I need to restrict the entities to only access the repository from where they are translated (using translator) to business entities shared at business and service layer. I thought of restricting them by specifying them as internal. Now there are more than 40 entities in my application so manually setting them as internal is a difficult job. In one of the forums the answers suggested using the T4 templates. But even those templates read from the entity framework access specifier. When I try to manually try to specify all the properties and class access specifiers as internal it gives me an error saying that the entity set should also be set to internal, but there is no option for the same. I am using VS 2010 and Entity Framework 4. Any suggestions???

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Checking for orphaned snapshots - ESXi5

- by Tim Alexander

So we had some issues with our passive mail node over the weekend doing vmtools updates and to resolve a problem we had to revert to a snapshot and then reseed all the databases across. All in all everything seemed fine, the server works and CCR copy status is running fine. I used the "Delete All" option this morning to remove the snapshot and the process according to vCenter has completed with no errors and no "Needs Consolidation" flag. This all seems fine until I check the Datastore that holds the VM on our SAN and I can clearly see snapshots that are pretty big [see attached image]. These do not seem to be changing size and the data modified is around the time the works were started for the vmtools update. Does this possibly mean that at some stage, possibly during reversion or hard resetting of the VM, that they have become orphaned? Are there any methods to check orphaned status of snapshots? We are running ESXi5.0 Update 1 with storage provide by an EMC SAN. Enterprise plus is the license level.

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Recover data from a corrupted virtualbox vmdk file?

- by Neth

The power went out while I was doing a build on a VirtualBox machine, when I restarted the vmdk for the disk the vm was using was corrupted, apparently irrecoverably. I have been able to grep the 66GB vmdk file and it finds strings from the code I was working on that hadn't gotten in to subversion yet (yeah, yeah I know). But the strings are either in the shell history or what look to be strings inside object files. Any ideas for finding/recovering the source code? If it helps the vm was Linux, Fedora Core 10 on an ext3 filesystem. The host is an ubuntu 10.04_amd64 and has an ext4 filesystem.

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codemirror fails when adding </textarea> tag inside it

- by Jorre

I'm using codemirror http://marijn.haverbeke.nl/codemirror/ to let users create their own web templates inside a web application. Codemirror works great, except for the time that users have put a tag inside their source code. When I load that up inside code mirror, it breaks everything in the source code that follows after because it thinks my codemirror text area is closed. I'm using the following way to launch codemirror: CodeMirror.fromTextArea('code') It works great on my existing textarea "code" except when users add inside their templates (in the codemirror textarea). Any help is much appreciated!

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CA and VPN setup

- by Raj

We are a small comany about 20 employees. We have some off site some i houser servers. Where should I install CA? On a domain controller or VM? can I obtain my own certificate for MS VPN? Where should I install MS vpn server? can I install on VM CA server? Do I need to open any ports on Firewall? Please send me or direct me to a web site where I can get setip by step installation instructions. Thanks.

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32-bit java dominates my PATH magically

- by Kos

I have a 32-bit Java installed just for Chrome and 64-bit Java JDK for everything else. When I type java -version in the cmd, the 32-bit Java answers: C:\>java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing) This is the 32-bit JRE installed for Chrome (the installer name was chromeinstall.exe). However, I'd like the default Java to be this one: C:\>"Program Files\Java\jre6\bin\java.exe" -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) And for the fun part, only the 64-bit one is in PATH! C:\>echo %PATH% C:\Windows\system32;C:\Program Files\Java\jre6\bin (snipped irrelevant entries) So long story short: 64-bit JRE is in PATH, but 32-bit JRE is ran by default. What is happening here? How to fix it? Tried reinstalling the 64-bit JDK as a whole, didn't help.

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Mod_rewrite not working on ISPConfig 3 Server

- by Akahadaka

Problem I recently migrated a Drupal site from a shared hosting server to my own VM. Everything appears to work correctly, except clean urls. My VM Setup Ubuntu 10.04 LAMP ISPConfig 3 What I've tried From reading up on a number of drupal forums I've tried the following in this order Check that mod_rewrite is installed and enabled Changed PHP from FastCGI to Mod_PHP (prefer to use FastCGI or suPHP though to avoid having tmp/files folders with 777 permissions) Changed the Redirect type to L in ISPConfig Sites-domain.com-Redirect Changed /etc/apache2/sites-enabled/000-default <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride All ... </Directory> Not sure about points 3 and 4, I do want all domains to be able to use mod_rewrite out of the box. Question Have I done something wrong or am I missing a step? Ultimately I would like to use FastCGI and clean urls working on all ISPConfig 3 domains without having to make any changes to individual domain settings. Any ideas appreciated, I'll try them all.

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Keepalived takes several minutes to recover in a particular situation

- by NathanE

I've setup Keepalived for a master-slave style virtual IP and it seems to work well. Both are hosted in almost identical VMs. If I "pause" the VM that is running the Master. The Slave will take over, as expected, almost instantly. However if I then "unpause" the VM that runs the Master. The virtual IP will stop responding the pings. And it takes a good 4 or 5 minutes for it to start pinging again. It seems to be getting desynchronised due to the nature of the way I'm testing it (by pausing/unpausing the VMs). I admit that pausing and unpausing VMs is a slightly dodgy way to test this. But it has raised a concern for me that there could be other scenarios that cause the same undesirable behaviour. Is this expected / by design? Is there anything I can do to the config to improve it? Thanks.

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Too many processes?

- by Mophily

VMware Fusion v3.0.1 One vm for Windows XP, converted and recently expanded the disk size. Mac OS X 10.5.8, 2 x 3 GHz dual-core intel xeon machine. Immediately after booting, and before VMware Fusion is launched, the Activity Monitor shows eight processes associated with "vm". What caught my eye is the duplicates: netifup and dhcpd. I noticed this while trying to re-establish network connectivity after the upgrade to 3.0.1. I am not sure when the network connection was clobbered, so I cannot say it happend during the upgrade. Is eight processes typcial? I expect about six, as listed in other notes and documents on the web site. Could this be related to the failure to connect to the network?

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Where is the visual studio 2010 setup and deployment project template

- by Tom Brown

In VS 2008, when I create a project I can add a setup project easily. File-Add-New Project... then in Project types: select Other Project Types-Setup and Deployment - and there are a whole load of installed templates - including Setup Project to create an MSI installer. But in VS 2010 - there are no templates in the Setup and Deployment - I'm using the Pro edition, not Express or beta: Is this the same for you - or do I have a duff installation of VS 2010? Otherwise how do I create an MSI installer for my projects?

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Sensitive data in init scripts

- by Steve Jorgensen

I'm adapting some examples I've found by Googling to build an init script to run a VirtualBox OSE virtual machine as a daemon. I would like to specify a password for VNC access to the VM, and this must be given as an argument to the VBoxHeadless command. Conventionally, init scripts are readable by standard users, and this seems like a useful convention, but I also don't want the VNC password for this VM to be stored in easily accessible plain text. What's the most appropriate/conventional way to handle this kind of situation? Maybe put a root-readable supporting data file someplace, and have the init script load the value from there?

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How do I fix a "cannot open display" error when opening an X program after ssh'ing with X11 forwarding enabled?

- by Daryl Spitzer

After launching the X11 app (XQuartz 2.3.6, xorg-server 1.4.2-apple56) on my Mac (OS X 10.6.8), opening an terminal in X11 and running xhost +, I then ssh -Y to my Ubuntu 10.04 VM (running on VMware Fusion). When I run gedit .bashrc (for example), I get: (gedit:9510): Gtk-WARNING **: cannot open display: set | grep DISPLAY returns nothing. But if I ssh -Y into my Ubuntu 11.04 machine, gedit .bashrc works. echo $DISPLAY returns "localhost:10.0". I tried export DISPLAY=localhost:10.0 while sshed into my VM and then running gedit .bashrc, but I get: (gedit:9625): Gtk-WARNING **: cannot open display: localhost:10.0 What could be different in the configuration of the two difference Ubuntu machines that would explain why one works and the other doesn't? Update: As suggested by Zoredache in the comment below, I ran sudo apt-get install xbase-clients, but I continue to have the same problem.

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iSCSI: LUNs per target?

- by badnews

My question relates specifically to ZFS/COMSTAR but I assume is generally applicable to any iSCSI system: Should one prefer to create a target for every LUN that you want to expose? Or is it good practise to have a single target with multiple LUNs? Does either approach have a performance impact? And is there some crossover point where the other approach makes sense? The use case is for VM disks, where each disk (zvol) is a LUN. So far we have created a a separate target for each VM; but a single target that contains all the LUNs would probably greatly simplify management... but we may need hundreds of LUNs per a single target. (And then possibly tens of initiator connections to that target)

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Unable to launch google.com inside Linux Ubuntu

- by Anuradha

I have installed Ubuntu Linux VM in my Win XP box. I am able to open http://google.com on Win XP but when I login to, ubuntu linux.. and launch this site: I am getting an error: Server not found. The network settings I have on LinuxUbuntu VM is : Adapter1 : attached to Bridge adapter. I tried NAT as well. But nothing seems to work. I am not in China. I provide google.com as mere example. We have a test website which cannot be launched inside Linux Ubuntu.

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How to make a DHCP server on virtual machine serves other virtual machines(on different physical machines)?

- by Tony

I'm building a virtual cluster with VirtualBox and Opensuse. I have 10 physical machines and need several vms on each. The virtual machines are supposed to be in a "private" network, but still have internet access. I was asked to set up a virtual head node working as DHCP server. I installed DHCP server on the virtual head node and it seems works. On VirtualBox I set 2 network adapters to the head node, one bridged adapter and one internal network. One vm on the same physical machine has been set nic as internal network adapter. The vm can get IP address (so DHCP works) but can't access internet. What should I do? Specifically, what network adapter should I choose for head-node and work-nodes in VirtualBox? What in the virtual machines should I do?

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Hyper-V Ubuntu 10.04, Filesystem suddenly becomes Read-Only?

- by Daniel Upton

We are running a Ubuntu 10.04 VM on a Hyper-V system, The VM is dedicated to running one of our web applications. We have enabled the Hyper-V drivers in /etc/initramfs-tools/modules like so: hv_vmbus hv_storvsc hv_blkvsc hv_netvsc And updated the kernel image like so: $ update-initramfs -u And all was good... until.. This morning i got a support request that our web application was throwing an error 500, so i checked the logs and nothing was there. Then I remembered that I had seen this on another of our ubuntu servers so I... $ touch foo.txt And my suspicions were confirmed: touch: cannot touch `foo.txt': Read-only file system Why is the filesystem randomly becoming readonly? Is this only in Ubuntu on HV? Is it a problem on RedHat or Cent?

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Joomla Template Parameters and params.ini

- by Moak

I am using wamp and creating a Joomla template with changeable parameters. initially the message is The parameter file \templates\ssc_2010\params.ini is writable! once I make changes everything works as expected, except now i get the message: The parameter file \templates\ssc_2010\params.ini is unwritable! One solution is to brows to the directory, right click the file, select properties, and uncheck read-only. Again the file is writable but once I modify the parameters again it becomes read only again. I'm quite lazy and would like to prevent this from happening again, I've notice this happening in past projects, but now I have to work a lot with parameters so it becomes quite boring doing manual labor like that :P

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VirtualBox won't use any kind of hardware acceleration

- by burnersk

I see an problem with VirtualBox hardware acceleration functionality... My system configuration: MSI PH67A-C43 (B3) (BIOS: 2.70) Intel Core i5-2400 Windows 7 Professional SP1 64-bit Oracle VirtualBox 4.1.10 Oracle VirtualBox Extension Pack 4.1.10 I can select the individual acceleration options such as PAE/NX, VT-x/VMD-V or Nested Paging within VM-Settings but if I start the VM the accelerations will be disabled as of the tooltip from CPU (right next to shared folders). Each acceleration is "Disabled". Does this sounds familar to anybody? How can I solve this?

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How can I write a Template.pm filter to generate PNG output from LaTeX source code?

- by Sinan Ünür

I am looking for a way of generating PNG images of equations from LATEX source code embedded in templates. For example, given: [% FILTER latex_display ] \begin{eqnarray*} \max && U(x,y) \\ \mathrm{s.t.} && p_x x + p_y y \leq I \\ && x \geq 0, y \geq 0 \end{eqnarray*} [% END %] I would like to get the output: <div class="latex display"><img src="equation.png" width="x" height="y"></div> which should ultimately display as: I am using ttree to generate documents offline. I know about Template::Plugin::Latex but that is geared towards producing actual documents out of LATEX templates. Any suggestions?

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How to perform diagnostics (stress test) on HP Smartarray Controller

- by pepoluan

At my office, we have a server that we suspect its RAID controller (HP Smartarray) is failing. A cold boot, however, does not indicate anything. Can anyone recommend me a method to stress-test the controller? Symptoms that makes me suspect a failing controller: Disk access getting slower, queue getting longer Running dmesg on the XenServer console I see many messages similar to this one: end_request: I/O error, dev tda, sector 253655584 (the sector number is never the same) When we move the VM to another physical host, we no longer see the above message Running idle (without any running VM), the dmesg no longer emit the above message A search on Google indicated that the above message is most commonly associated with a failing SmartArray controller. How can I be sure that the SmartArray controller is failing?

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OpenVSwitch and Virtualbox configuration

- by Newbie

I am trying to setup a lab network with OpenVSwitch (Virtual L3 Switch). I want to connect my 3 Virtualbox guest machines (running Debian 6) using OpenVSwitch. But, confused as what should I do first and how should I do this. I mean should I install OpenVSwitch on my VM or on my host machine? If I install on my host machine, then should I make to connect to my VMs. OR If I install OpenVSwitch on one of my VM, then how to connect the rest of the VMs to virtual switch. I know, there is option to connect internal networks in virtualbox, but I a want L3 switch to interconnect my VLANs. Can someone guide me here. Please & Thank you.

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