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• Virtual PC lost parent disk for differential vhd

  - by SeeR

  2 years ago I had that brilliant idea to create base Windows XP disk which all of my VM with XP will use. Of course it ended that I had only one VM with XP :-). Today I needed to make some free space on my HDD so I found one not used VM named "Windows XP" which had only 5GB. I deleted it as fast as possible :-) and of course I used shift to not use "Recycle bin". Now when I want to run my XP VM I have following error: "One of the parent hard disks of ... is missing." It's not a problem for me as soon as I can restore files from this differential vhd that I have right now. So: I have differential disk with files I need I don't have parent disk My question is: How can I restore files from this differential hvd?

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• nginx howto correct the path from a back-end server redirect response under a virtual directory

  - by noname

  The following was my deployed servers: client ------ nginx proxy(example.com) ------ back-end server(192.168.1.20) The nginx proxy's external URL was configured under a virtual directory http://example.com/demo/ The back-end server was configure to http://192.168.1.20:8080/ the following was part of the nginx configure file: location /demo { proxy_pass http://192.168.1.20:8080/; proxy_redirect default; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } When the back-end server send a redirect response (HTTP CODE 302) with LOCATION head field "http://192.168.1.20/subdir/", the nginx map this LOCATION header field to "http://example.com/subdir/", not the disired "http://example.com/demo/subdir/"

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• Maximum Length Of IP Address: 15 (IPv4) & 39(IPv6)

  - by Gopinath

  Problem You are designing a database table for a web application that requires to store IP address of users who visits the site. The IP address is required to be stored a character data in the table. To define size of the character column you need to know maximum length of IP address. So, what is the maximum length of an IP address? Solution The IPv4 version of IP address is in the following format 255.255.255.255 To store IPv4 address we require 15 characters. The IPv6 version of IP address is grouped into sets of 4 hex digits separated by colons, like the below 2001:0db8:85a3:0000:0000:8a2e:0370:7334 To store IPv6 address you require a 39 characters long column. Conclusion As IPv4 and IPv6 are the commonly use protocols, you better define a column with 39 characters length so that both the format address are saved in to the table without any issues. This article titled,Maximum Length Of IP Address: 15 (IPv4) & 39(IPv6), was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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• 7 Ways To Free Up Hard Disk Space On Windows

  - by Chris Hoffman

  Hard drives are getting larger and larger, but somehow they always seem to fill up. This is even more true if you’re using a solid-state drive (SSD), which offers much less hard drive space than traditional mechanical hard drives. If you’re hurting for hard drive space, these tricks should help you free up space for important files and programs by removing the unimportant junk cluttering up your hard disk. Image Credit: Jason Bache on Flickr 7 Ways To Free Up Hard Disk Space On Windows HTG Explains: How System Restore Works in Windows HTG Explains: How Antivirus Software Works

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• Virtual Server 2005 R2 kungfu

  - by AngryHacker

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

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• Likeliness of obtaining same IP address after restarting a router

  - by ?affael

  My actual objective is to simulate logged IPs of web-site users who are all assumed to use dynamically assigned IPs. There will be two kinds of users: good users who only change IP when the ISP assignes a new one bad users who will restart their router to obtain a new IP So what I would like to understand is what assignment mechanics are usually at work here deciding from what pool of IPs one is chosen and whether the probability is uniformly distributed. I know there is no definite and global answer as this process can be adjusted be the ISP but maybe there is something like a technological frame and common process that allows some plausible assumptions. UPDATE: A bad user will restart the router as often as possible if necessary. So here the central question is how many IP changes on average are necessary to end up with a previously used IP.

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• How to set up virtual users in vsftpd?

  - by ares94

  I've read this tutorial: http://howto.gumph.org/content/setup-virtual-users-and-directories-in-vsftpd/ My configuration is as follow: ---vsftpd.conf--- listen=YES anonymous_enable=NO local_enable=YES virtual_use_local_privs=YES write_enable=YES connect_from_port_20=YES pam_service_name=vsftpd guest_enable=YES user_sub_token=$USER local_root=/var/www/sites/$USER chroot_local_user=YES hide_ids=YES ---/etc/pam.d/vsftpd--- auth required pam_pwdfile.so pwdfile /etc/vsftpd/passwd account required pam_permit.so I created file /etc/vsftpd/passwd and added users using htaccess. I tried to login but it didn't work: ftp 127.0.0.1 Connected to 127.0.0.1 (127.0.0.1). 220 vsFTPd 2.3.5+ (ext.1) ready... Name (127.0.0.1:root): user1 331 Please specify the password. Password: 530 Permission denied. Login failed. Everything seems fine accept the permission denied thing. How can I fix this?

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• Windows Azure virtual machine credentials

  - by Georges

  I have created a Windows Server virtual machine, and this also automatically created a disk (VHD). Then I removed the vm, and I created a new vm from the same vhd: in this process I wasn't asked to supply any credentials. I am not able anymore to login (with rdp) to the new VM, the credentials that I supplied when creating the first machine don't work anymore. Any ideas why this happens? What credentials should I use? Thanks a lot in advance.

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• mysql cluster virtual ip

  - by user225995

  I am new in mysql cluster and mysql cluster and versions are not my choice. I setup four machines. Two of them manager , Two of them data cluster (ndb and mysqld). And i integrate with mysql utilities master/slave configuration. Everything working fine. Mysql version 5.6.17, ndb 7.3.5 , servers ubuntu 14.04. There will be no much transactions. The only important thing is HA. Everythings must be double. My problem is virtual ip. Since I have only one farm which have master slave configuration, how can i do it without proxy? If I must use proxy which proxy is better?

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• Virtual Box - not filling entire screen

  - by jdavis

  I am new to VirtualBox and am trying to set up an instance of Windows 7 64. I have the virtual machine instance running with Windows 7 now installed, but it only fills up a small portion of my screen. Even when I go full screen, the window stays the same size and the rest of the screen is filled with gray space. I have installed VirtualBox Guest Additions, which allowed me to go from a resolution of 800x600 to 1024x768, but this still isn't satisfactory as my laptop display is 1600x900. Any help on this would be most appreciated. Thanks.

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• Odd SVN Checkout failures occur frequenctly on VMWare virtual machines

  - by snowballhg

  We've recently been experiencing seemingly random SVN checkout failures on our Hudson build system. Google search has failed me; I'm hoping the super user community can help me out :-) We are occasionally receiving the following SVN error when our Hudson build jobs checkout source via the Hudson Subversion plug-in (which uses svn kit): ERROR: Failed to check out http://server/svnroot/trunk org.tmatesoft.svn.core.SVNException: svn: Processing REPORT request response failed: XML document structures must start and end within the same entity. (/svnroot/!svn/vcc/default) svn: REPORT request failed on '/svnroot/!svn/vcc/default' This issue seems to only occur when checking out from our Virtual Machines (Windows XP, Fedora 9, Fedora 12) using Hudson's SVN Plug-in. Systems that use the traditional SVN client seem to work. SVN Server version: 1.6.6 Hudson version: 1.377 Hudson SVN Plugin Version: 1.17 Has anyone dealt with this issue, or have any suggestions? Thanks

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• Cherokee high virtual memory usage even after disabling I/O Cache

  - by nidheeshdas

  I've Ubuntu 10.04LTS 64-bit running on a openvz container and Cherokee 1.0.8 compiled from source. The virtual memory usage of cherokee-worker is around 430 MB even after disabling I/O cache from Advanced - I/O Cache - NOT enabled. Is this issue particular to openvz? Because many people reported to have successfully reduced virt memory usage by disabling io cache. htop output: http://imgur.com/z5JEL.jpg (newbies not allowed to post image.) thanks in advance. nidheeshdas

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• DHCP server inside a virtual machine can't see other machines

  - by William

  Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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• vmware host stuck after adding a virtual drive to client

  - by Saariko

  I use ESXi 5.0 I created a virtual (400GB) drive (located on an iSCSI mapped drive), and tried to add it to a specific client on the host. The task has stopped at 11%. After over an hour, it seems that everything is pretty stuck. Looking at the datastore - it says that 400GB are allocated, but I don't see the new drive with the client. How can I check if the process is still working? or should I restart the host and pray for good?

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• Exporting virtual machine from Windows Azure to Amazon

  - by Somebody

  As documentation says: You can import VMware ESX and VMware Workstation VMDK images, Citrix Xen VHD images and Microsoft Hyper-V VHD images for Windows Server 2003, Windows Server 2003 R2, Windows Server 2008 and Windows Server 2008 R2. What about virtual machine with Ubuntu on it? Will it import it successfully? Have anyone tried to do it? Is it possible to import VM directly from Windows Azure. Without need to download VM on my machine and then upload it to Amazon? Thanks.

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• Changing the IP address with a name [closed]

  - by fede

  I have a web server (xampp) in a particular PC running on my LAN, and I added the following line in the 'hosts' file : 127.0.0.1 mysite. Then, in another PC connected to the LAN, I'm trying to acces the previous web server by typing 'http://mysite/index.php' on the web browser, with no luck. But if I type the IP from the server computer (http://192.168.2.87/index.php) I am able to access the web site. So, what should i configure so when i type 'http://mysite/index.php' I get the same result as http:// 192.168.2.87/index.php ?? Thanx!

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• Run Photoshop on VM (virtual machine) to increase calculation power, without violating the licence agreement (EULA)

  - by mecplusultra

  A question concerning the possibility to run Photoshop as VM without violating the licence agreement (EULA) : My Adobe Photoshop is bloody slow, nd sometimes I need to launch thousands of image calculations that have to use hundreds of PSD templates. I want to increase my Photoshop calculation power by creating non-persistent virtual machines on my hosted server. Each VMm would only alive for a few seconds, just enough time to deliver the calculated file. Is this a violation of the EULA? I must clarify that I'm the only one to access my non persistent VMs.

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• Cherokee high virtual memory usage even after disabling I/O Cache

  - by nidheeshdas

  hi all I've Ubuntu 10.04LTS 64-bit running on a openvz container and Cherokee 1.0.8 compiled from source. The virtual memory usage of cherokee-worker is around 430 MB even after disabling I/O cache from Advanced - I/O Cache - NOT enabled. Is this issue particular to openvz? Because many people reported to have successfully reduced virt memory usage by disabling io cache. htop output: http://imgur.com/z5JEL.jpg (newbies not allowed to post image.) thanks in advance. nidheeshdas

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• Wifi in android-x86 with virtual box [closed]

  - by Abhishek

  I am trying to run android-x86 in Virtualbox, I am using a laptop which connects to internet via WiFi. When the android starts in virtual box, it does not recognize the host wireless connection or in other words does not identify the wireless network at all. So I got a TP-Link wireless USB adapter connected to the laptop and configured wireless controller in USB for the VM. But sadly I found that the wireless is disabled as soon as the Android VM starts. I am stuck on how to let android running in Virtualbox identify my Wifi. Any guidelines or set up instructions would be greatly helpful.

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• Howto setup a `veth` virtual network

  - by Reinder

  I'd like to setup three virtual network interfaces (veth) which can communicate with each other. To simulate a three node cluster, each program then binds to one veth interface. I'd like to do it without LXC if possible. I tried using: Created three veth pairs: sudo ip link add type veth Created a bridge sudo brctl addbr br0 Added one of each pair to the bridge: sudo brctl addif br0 veth1 sudo brctl addif br0 veth3 sudo brctl addif br0 veth5 Configured the interfaces: sudo ifconfig veth0 10.0.0.201 netmask 255.255.255.0 up sudo ifconfig veth2 10.0.0.202 netmask 255.255.255.0 up sudo ifconfig veth4 10.0.0.203 netmask 255.255.255.0 up Then I verified if is works using: ping -I veth0 10.0.0.202 but it doesn't :( The I added IP addresses to the veth1,veth3,veth5 and br0 interfaces in the 10.0.1.x/24 range. But that doesn't help. Any ideas? or a guide, all I find in how to use it with LXC. Or am I trying something that isn't possible?

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• Services of virtual machines

  - by RredCat

  I am looking a way to establish dev machine on the cloud. I want to have access for development from different places. I don't want to play with sync brunch and so on. It would be Lubuntu with 1G or 512M memory and I want to have way to setup my image. What I have found in the current moment: Amazon EC2 service Azure Virtual Machines I am pretty sure that there should be more services like this. I hope to find one specified for this purpose. I have experience to work in such way and I like it. Unfortunately it was server of certain company for projects of this company and I can't use it for my private aims. Could anybody suggest me anything?

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• Converting CIDR address to subnet mask and network address

  - by Dmitry

  Given a CIDR address, e.g. 192.168.10.0/24 How to determine mask length? (24) How to determine mask address? (255.255.255.0) How to determine network address? (192.168.10.0)

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• Address of function is not actual code address

  - by mrjoltcola

  Debugging some code in Visual Studio 2008 (C++), I noticed that the address in my function pointer variable is not the actual address of the function itself. This is an extern "C" function. int main() { void (*printaddr)(const char *) = &print; // debug shows printaddr == 0x013C1429 } Address: 0x013C4F10 void print() { ... } The disassembly of taking the function address is: void (*printaddr)(const char *) = &print; 013C7465 C7 45 BC 29 14 3C 01 mov dword ptr [printaddr],offset print (13C1429h) What am I missing?

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• Can destructors be declared as pure virtual? [closed]

  - by skydoor

  Possible Duplicate: Why do we need a pure virtual destructor in C++? I know that the destructor can be virtual, how about pure virtual? If yes, what's the usage? If not, what's the error, compile error or runtime error?

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• Integrating virtual keyboard on a HP TouchSmart with an Adobe AIR app

  - by Alan

  Hi, Does anyone know if it's possible to integrate the ToushSmart's virtual keyboard with an Adobe AIR application? In most programs (Internet Explorer, Firefox, etc), when a user touches a text field a little keyboard icon automatically pops up which, when pressed, will bring up the virtual keyboard. However, this doesn't happen when clicking on text input fields in Adobe AIR applications. Has anyone had any experience working with AIR/Flash and touchscreens? Is there any API that can tell Windows (or the HP virtual keyboard specifically) that the user has clicked in a text field and that the virtual keyboard should be shown? The text fields are the standard kind (fl.controls.TextInput). Any suggestions would be greatly appreciated. Thanks in advance!

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