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  • virtual function

    - by hitech
    class a { virtual void foo(void) ; }; class b : public a { public: virtual void foo(void) { cout<< "class b"; } }; int main ( ) { class a *b_ptr = new b ; b_ptr->foo(); } please guide me why the b_ptr-foo() will not call the foo() function of the class b?

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  • Iptables based router inside KVM virtual machine

    - by Anton
    I have KVM virtual machine (CentOS 6.2 x64), it has 2 NIC: eth0 - real external IP 1.2.3.4 (simplified example instead of real one) eth1 - local internal IP 172.16.0.1 Now I'm trying to make port mapping 1.2.3.4:80 = 172.16.0.2:80 Current iptables rules: # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A PREROUTING -p tcp -m tcp -d 1.2.3.4 --dport 80 -j DNAT --to-destination 172.16.0.2:80 COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 But there is nothing works, I mean it does not forwards that port. Similar configuration without virtualization seems to be working. What am I missing? Thanks!

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  • Is there a preferred way to set up a virtual Ubuntu server on a desktop?

    - by Keith Groben
    I love Ubuntu, and as I am searching the internet, I am finding that some questions I have have not been answered yet. One of them is if there is a preferred way to set up a virtual server. I look through the Ubuntu Software Center, but found nothing from the search "Virtual Server" I then searched the internet and found lots of posts to trouble-shoot VMWare virtual servers. So, like a good researcher I looked in the Software center for VMWare. Sure enough I found "user agent" and "view open client". I didn't get sufficient info from the software center. And searching the website only left me scratching my head. I want to install Ubuntu Server Edition. I already have a server, but am cautious "trying out" things on it. So a virtual server sounds like what I need.

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  • don't know how this virtual directory structure was setup on iis6

    - by deostroll
    Our development server has a setup as follows: \\DEVSRVR\WEBSITES\COMMON +---include Here is where all css and script files resides. They are required by various web applications \\DEVSRVR\WEBSITES\TESTING\SAM +---Backup ¦ +---bin +---bin +---help Here is where an application resides. Suppose there is an aspx page under the folder called SAM, we'd normally issue an http request as follows: http://testing.apps/sam/default.aspx We believe that testing.apps virtual name points to \\devsrvr\websites\testing folder. Suppose there is a css file called menu.css inside common/include. We'd simply have to make the following http call to get it: http://testing.apps/common/include/menu3.css This works!!! I don't understand how? There is no such folder called common inside of testing...

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  • List of existing Android Virtual Devices empty

    - by sunpech
    I'm new to Android development and I'm currently going through some tutorials. When I setup a new Android Project in Eclipse, and select Windows - Android SDK and AVD Manager, in Virtual Devices, the list of existing Android Virtual Devices is empty. Is it supposed to be? From the pictures in the tutorial, it's pre-populated. Can I download these AVDs from somewhere, am I missing something here? Also, I'm developing this on my Macbook Pro.

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  • Virtual Machine files on ramdisk doesn't run faster than on physical disk

    - by Landy
    I installed total 36G memory (4x8G + 2x2G) in the host (Windows 7) and I used ImDisk to create a 32G ramdisk and format it to NTFS file system. Then I copied the virtual machine (in VMware Workstation format) folder, including vmx, vmdk, etc... to the new created ram disk. Then I tried to power on it in VMware Workstation. What made me surprised is that the performance is not better than before. It cost almost the same time to power on the Windows 7 VM. I check the Resource Monitor in the Windows 7 host, and the statistics of CPU, disk, network are rather normal. The memory has reported 3000+ hard fault/sec when guest OS boot then drop to 0 after the guest powered on. Any idea about this issue? I had thought the performance of ramdisk will be better than physical disk in this case. Am I wrong? Thanks.

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  • Create Virtual Image of Laptop before Formatting

    - by Simon Mark Smith
    I have a 3 year old laptop running Windows XP that I used for business. Although I have not used the laptop in over a year, I now want to re-commission it with Windows 7 and a fresh install. Before I do the fresh install I want to create a Virtual Image of the laptop that I can keep and potentially run on my desktop machine should I ever need to access any of the old files/projects that it contains currently. I know that most people will say just copy the files over to your desktop, but my concern is the configuration of the laptop. I used to use it for development and it has older versions of Visual Studio, SQL Server, Active X controls etc, etc than I currently use so I really want to preserve the environment not just the files. So really I am asking what is the best tool-set/method to achieve this? I understand there are free VM tools available but I have never done this before and would appreciate any help.

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  • pip install very slow through virtual box

    - by AJP
    pip install --exists-action=w -r requirements.txt is very very slow through virtual box. Any suggests of how to diagnose and fix? Would seeing the VagrantFile be useful? VirtualBox 4.2.12 (can't upgrade to .14 as it doesn't work.) Vagrant 1.0.7 Host machine: ProductName: Mac OS X ProductVersion: 10.7.5 BuildVersion: 11G63b VagrantFile contains: Vagrant::Config.run do |config| config.vm.box = "precise64" config.vm.customize ["modifyvm", :id, "--memory", 2048] config.vm.box_url = "http://files.vagrantup.com/precise64.box" config.vm.network :hostonly, "33.33.33.21" config.vm.forward_port 5000, 5000 config.vm.forward_port 5555, 5555 config.vm.share_folder "v-root", "/vagrant", "./" Vagrant::Config.run do |config| config.vm.provision :shell, :inline => "VENV=/usr/local/venv bash /vagrant/setup_env.sh" end end Normal download speed is only about 5 times slower at 0.8 Mb per second versus 4 MB per second (as judged by curling a 50 Mb file from S3). But pip install is taking about 20 times longer from Mac (i.e. about 40 minutes) versus 2.

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  • VMWare Server :: VM set to 2gb RAM but vmware process shows 100mb physical, 1900mb virtual

    - by brad
    I've set up a VMWare instance to run CastIron Integration Appliance. I allocated 2gb of memory to the instance, assuming it would take this as physical memory (my server has 8gb total). When I view top however on the server, the vmware-vmx process has about 100m Resident memory and 1900m Virtual. Running CastIron it reports that the appliance often hits 50% memory usage. Does this mean I'm using 900mb of harddrive space as memory? I wanted VMWare to use 2gb of physical memory, no swap. Can anyone tell me how to achieve this? Setup Debian Lenny 5.0.3 VMWare Server 2.0.2

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  • Virtual firewall to protect hypervisor

    - by manutenfruits
    I am running an Ubuntu Server 12.10 as a single host connected to a NATed router connected using PPPoE to a optical fiber modem. This server is meant to be accessed from the Internet, but also to be used from the LAN as a SVN, MySQL and what not... The issue is that the router is not customizable enough to serve, so I was thinking about creating a virtual pfSense firewall using KVM inside of the server itself, removing the need of the router. Is this possible? Can the host ignore and block all traffic coming to itself, but not for the firewall? I am aware this is not the most desirable environment, I accept suggestions based on budget!

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  • Make IP Address point to webroot instead of virtual hosts' documentroot

    - by Reuben L.
    I used to have a one-to-one domain name and IP. Recently I've paid for a second domain name and decided to host it on the same box and IP. As such, I added virtualhosts to point each domain name to a different document root (i.e. /var/www/webbie1 and /var/www/webbie2). The question I have is, can I still make the IP, e.g. http://XXX.XXX.XXX.XXX, point to the webroot, i.e. /var/www/? If so, how do I go about doing it? For a fuller picture, the box is on an Ubuntu server OS and I'm using apache2 as the app server. the changes I made to enable to virtual hosts were in the apache2.conf file with the <VirtualHost [IP address]> ... </VirtualHost> tags. Thanks.

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  • VMware - Watching multiple virtual machine screens

    - by mr.b
    Hi, I don't know even if I put the question right, but here's what I'd like to accomplish. I have avoided specifying exact Vmware virtualization product here because I'm not sure which one would be most suitable for the task at hand. I am developing an application that works in local network. This application has to run on several computers at the same time, and it's important to me, as a developer and tester, to see (literally) how it behaves at all times on all computers. Is there any way to connect to screens of virtual machines deployed on ESX, ESXi, Sever 2.0, or some other product, so that I can see something like grid of screens, say 4x4 or 6x4 or whatever number of scaled screens, at the same time? Ability to interact with screens directly from grid (by double-clicking a screen, for instance, and then getting full resolution screen) would be greatly appreciated, of course. I hope that someone understood what I meant here. :)

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  • Blocking non-virtual host access in Apache?

    - by cmbrnt
    I'm running an apache-server, with a bunch of virtual hosts for about seven domain names. Now I'd like to disallow access for clients who try to access my server using only its IP-adress. So: When someone accesses my website through www.domain.com, they reach the site hosted in /var/www/domain.com/public_html/. When someone enters the ip-address of the server they reach a 403 Forbidden-message. The problem with this is that they are theoretically able to reach my other sites through bruteforce, when getting http://11.22.33.44/domain.com/public_html/. I rather want them to reach a 403 Forbidden all the time, as long as they don't access my server by a valid domain name. How do I solve this problem?

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  • Cisco VPN Client on Vista - Virtual Adapter

    - by ScaleOvenStove
    I have used the Cisco VPN client for years, and on XP it is pretty much rock solid, on Vista, not so much. You might be able to connect, but unless you set up a constant ping to something, it usually will disconnect, with this error: Reason 442: Failed to enable Virtual Adapater Now, most sysadmins will say, update you client - yes, I know, it hasnt mitigated the issue, ever. I have been using it on Vista since it came out, and updated my client every time a new update comes out. I have used it where the VPN server was a Cisco PIX and a Windows Box allowing the Cisco Client to connect. Anyone have any fixes that you can do on your client to fix this issue?

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  • how do I set up a virtual host (it's not working, and I've done everything right)

    - by piratepartypumpkin
    My router redirects port 80 to port 8080. My router works fine and my domain name is routed properly. This is my virtual hosts file: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot /home/admins/lampstack-5.3.16-0/apps/wordpress ServerName example.com ServerAlias www.example.com </VirtualHost> I can access my website by entering "mywebsite.com:8080" but I cannot access it by entering "mywebsite.com" For further information, this is a part of my httpd.conf: Listen 8080 Servername localhost:8080 DocumentRoot "/home/admins/lampstack-5.3.16-0/apache2/htdocs <Directory /> Options FollowSymLinks AllowOverride None Order deny, allow deny from all </Directory> <Directory "/home/admins/lampstack-5.3.16-0/apache2/htdocs"> Options FollowSymLinks AllowOverride None Order allow, deny allow from all </Directory>

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  • Sharing VPN from XP to Linux virtual

    - by user55513
    Hi I will keep the question simple with few details, if more is needed tell me. Thanks. I am playing around with networking and virtualbox. So I have 2 virtual machines. One is windows xp and another has linux in it. Windows XP has 2 network cards. One for the internet and the other to connect to the linux computer. Linux has one 1 card and it can only access the internet passing through Windows XP. Internet works fine until I activate OpenVPN on Windows. When I turn on VPN, Linux has no access to it. How can I make linux use VPN too? I believe it has something to do with using the "route" command on XP to send VPN traffic to Linux but I was not able to figure it out how yet.

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  • Apache virtual host documentroot in other folders

    - by giuseppe
    I am trying to set up a couple ov VritualHost in my Apache, but I would like to put the DocumentRoot of these virtual host on folders outside the basic www folder. It happens that I get alwasy "Permission Denied". My httpd.conf follows: NameVirtualHost *:80 <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /home/giuseppe/www ServerName www.example.com/www ErrorLog logs/host.www.projects-error_log CustomLog logs/dummy-host.example.com-access_log common <Directory "/home/giuseppe/www"> Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /home/developper ServerName www.example.com ErrorLog logs/host.developper-error_log CustomLog logs/dummy-host.example.com-access_log common </VirtualHost>

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  • adding virtual function to the end of the class declaration avoids binary incompatibility?

    - by bob
    Could someone explain to me why adding a virtual function to the end of a class declaration avoids binary incompatibility? If I have: class A { public: virtual ~A(); virtual void someFuncA() = 0; virtual void someFuncB() = 0; virtual void other1() = 0; private: int someVal; }; And later modify this function to: class A { public: virtual ~A(); virtual void someFuncA(); virtual void someFuncB(); virtual void someFuncC(); virtual void other1() = 0; private: int someVal; }; I get a coredump from another .so compiled against the previous declaration. But if I put someFuncC() at the end of the class declaration (after "int someVal"), I don't see coredump anymore. Could someone tell me why this is? And does this trick always work? PS. compiler is gcc, does this work with other compilers?

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  • DNS Zone file and virtual host question

    - by Jake
    Hi all, I'm trying to set up a virtual host for redmine.SITENAME.com. I've edited the httpd.conf file and now I'm trying to edit my DNS settings. However, I'm not sure exactly what to do. Here's an snippet of what's already in the named.conf file (the file was made by someone else who is unreachable): zone "SITENAME.com" { type master; file "SITENAME.com"; allow-transfer { ip.address.here.00; common-allow-transfer; }; }; I figure if I want to get redmine.SITENAME.com working, I need to copy that entry and just replace SITENAME.com with redmine.SITENAME.com but will that work? I was under the impression I needed a .db file but I don't see any reference to one in the current named.conf file. Any advice would be great and if you need more info to answer the question, don't hesitate to ask.

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  • Working with a copy of my Virtual Machine

    - by Gaby Reyna
    Hi there I'm trying to make a backup/copy of my virtual machine, it's installed in a Windows Server 2000 and I want to make some modifications/tests without changing the original one. The copy is to be used in Windows 7, what I'm trying to do is work/modify an application that communicates with a DB, this application is hosted on the VM, the DB too, and since I don't want to screw up the stable version I want to know how to copy the VM to my desktop pc to experiment without worries. Now, someone told me I might have problems with the IP 'cause the original will have the same IP, and if I change it, it won't work properly. Is this true? If it is indeed true, any suggestions??

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  • How to install a "virtual" network card on a virtual server?

    - by vikp
    Hi, We have purchased an unmanaged VPS windows hosting solution from one of the UK based companies. We have Windows Server 2008 Standard Edition. We need to install certain third party applications on that server. Unfortunatelly, one of the applications requires a MAC address to be present at all times - this is their way of making sure that software is not pirated (which it isn't). We have tried installing a virtual loopback network card, but this has brought the server down - i.e. we couldn't connect using remote desktop any longer. At the moment we are limited with what we can try. This is an unmanaged solution, therefore any support including restarts is rather costly. Are you aware of any low-risk solutions? Thank you

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  • what is a virtual adapter

    - by numerical25
    I hear the term virtual adapter from time to time. But not exactly sure what it is. I can't exactly find a good definition online. Is there an exact definition for a virtual adapter. If so, what is it. Or what does it usually mean ?

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