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  • How do you return a pointer to a base class with a virtual function?

    - by Nick Sweet
    I have a base class called Element, a derived class called Vector, and I'm trying to redefine two virtual functions from Element in Vector. //element.h template <class T> class Element { public: Element(); virtual Element& plus(const Element&); virtual Element& minus(const Element&); }; and in another file //Vector.h #include "Element.h" template <class T> class Vector: public Element<T> { T x, y, z; public: //constructors Vector(); Vector(const T& x, const T& y = 0, const T& z =0); Vector(const Vector& u); ... //operations Element<T>& plus(const Element<T>& v) const; Element<T>& minus(const Element<T>& v) const; ... }; //sum template <class T> Element<T>& Vector<T>::plus(const Element<T>& v) const { Element<T>* ret = new Vector((x + v.x), (y + v.y), (z + v.z)); return *ret; } //difference template <class T> Element<T>& Vector<T>::minus(const Element<T>& v) const { Vector<T>* ret = new Vector((x - v.x), (y - v.y), (z - v.z)); return *ret; } but I always get error: 'const class Element' has no member named 'getx' So, can I define my virtual functions to take Vector& as an argument instead, or is there a way for me to access the data members of Vector through a pointer to Element? I'm still fairly new to inheritance polymorphism, fyi.

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  • ubuntu on virtual machine vs ubuntu install, what the difference?

    - by Yosef
    Hi, I have windows xp in my work and i programming on zend framework. I need to install ubuntu for execute doctrine orm commands from linux console, I faile to do it on windows. I thinking about 2 option of UBUNTU installation: 1.install ubuntu 10.04 on Virtual Box (Sun Virtual Machine). 2.create new primary partition and install ubuntu 10.04 directly. Which options do you suggest to do? Thanks

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  • Is it ok to throw NotImplemented exception in virtual methods?

    - by Axarydax
    I have a base class for some plugin-style stuff, and there are some methods that are absolutely required to be implemented. I currently declare those in the base class as virtual, for example public virtual void Save { throw new NotImplementedException(); } and in the descendand I have a public override void Save() { //do stuff } Is it a good practice to throw a NotImplementedException there? The descendand classes could for example be the modules for handling different file formats. Thanks

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  • Not enough physical memory available to run Virtual Machine

    - by unknown (google)
    hi I when i am trying to run virtual machine on VMW 6.5 it shows me following error. "Not enough physical memory is available to power on this virtual machine with its configured settings. To fix this problem, adjust the additional memory settings to allow more virtual machine memory to be swapped. If you were able to power on this virtual machine on this host computer in the past, try rebooting the host computer. Rebooting may allow you to use slightly more host memory to run virtual machines." i have also tried options that are suggested from above error, but still its not working. Can you help me to solve this problem? Thanks

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  • Virtual Disk Degraded

    - by TheD
    There is a physical DC with a Raid 1 Mirror, 2 Physical Disks, 500GB each. Dell Server Administrator is installed on the DC, and is reporting both physical disks are fine, online, in a good state etc. On a PERC S300 Raid Controller: Physical Disk 0:0 Physical Disk 0:1 However at the same time it's reporting that a virtual disk is degraded, what exactly does this mean? The virtual disk indicates it's State is in a Raid 1 Layout. Device Name: Windows Disk 0 If my understanding is correct then the Virtual Disk, when you drill down into Dell OpenManage should have both physical disks as members, as it is a mirror? Is this correct? However, when I drill down into the Virtual Disk, it only displays Physical Disk 0:0 included in Virtual Disk 1. I'm very new to server side/raid management etc. just while our server techy is away! Thanks!

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  • Virtual Windows desktop

    - by Zack
    Is there any virtual desktop software that can virtualize desktop just like a virtual desktop to sandbox (sort of like virtualization and sandbox combined). I want to create many desktop and each of them must be sandbox. For example if I have virus infected in one of the desktop, I just have to clear or close the desktop and everything is fine. Is there any software that can do that kind of jobs that I have mentioned? Remember I am not asking recommendation of software, but the software that can do the job. UPDATE: I mean that every virtual desktop is working as a virtual box or sandbox. Clearing or closing the desktop will work as shutting down that virtual box.

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  • One bigger Virtual Machine distributed across many OpenStack nodes [duplicate]

    - by flyer
    This question already has an answer here: Can a virtualized machine have the CPU and RAM resources of multiple underlying physical machines? 2 answers I just setup virtual machines on one hardware with Vagrant. I want to use a Puppet to configure them and next try to setup OpenStack. I am not sure If I am understanding how this should look at the end. Is it possible to have below architecture with OpenStack after all where I will run one Virtual Machine with Linux? ------------------------------- | VM with OS | ------------------------------- | NOVA | NOVA | NOVA | ------------------------------- | OpenStack | ------------------------------- | Node | Node | Node | ------------------------------- More details: In my environment Nodes are just virtual machines, but my question concerns separate Hardware nodes. If we imagine this Nodes(Novas) are placed on a separate machines (e.g. every has 4 cores) can I run one Virtual Machine across many OpenStack Nodes? Is it possible to aggregate the computation power of OpenStack in one virtual distributed operating system?

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  • URL redirect to a virtual server on a VLAN

    - by zeroFiG
    I have a production site, running off 10 servers. I've been given another virtual server on the same network as these 10 servers, to use for testing purposes. This server doesn't have it's own DNS entry. Therefore I need to do a redirect to the site hosted on this virtual server for a sub-domain of the site running on the 10 other servers. So Basically I was wondering how I would configure a sub domain of my production server to point at the Virtual server for testing. I'm guessing I need to modify my site file in /etc/apache2/sites-available and add another virtual host like the following and modify the redirect match: <VirtualHost *> ServerName SUBDOMAIN.DOMAIN.com RedirectMatch 301 (.*) **IP ADDRESS** CustomLog /var/log/apache2/SUBDOMAIN.DOMAIN.com.access.log combined </VirtualHost> Do I set the redirect match to just the IP on the Virtual server, and then configure another site file in the sites-available directory, which will recption this redirect and point the browser towards the HTML root? Thanks, I hope I made myself clear.

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  • virtual box strectch to fit resolution

    - by Scarface
    Hey guys I have a really annoying problem, that I hope someone has figured out. I just installed ubuntu on virtual box and installed the guest additions so everything was great. I had a resolution that stretched across my screen from left to right and the only virtual box components that were visible were the windows vista title bar : minimize/exit/maximize buttons and virtual box controls at the bottom. Now all of a sudden now that I have installed the ubuntu 170mb of automatic updates, I see vertical and horizontal scroll bars that are part of virtual box and the ubuntu resolution will not stretch across my screen anymore. What I want is a ubuntu resolution that will stretch to fit the maximized window of virtual box, and remove the scroll bars. If anyone has any ideas, I would really appreciate it.

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  • non-mapped virtual memory & total number of connections

    - by tszming
    We have two MongoDB data nodes (replica set) - Primary & Secondary. I noticed that the non-mapped virtual memory is relatively high and wondering if they are hurting our MongoDB performance (The server usually peaked at around 6-7K queries per sec). In MMS, it was stated: "The most common case of usage of a high amount of memory for non-mapped is that there are very many connections to the database." So we checked the memory usage with db.serverStatus().mem in our Secondary: { "bits" : 64, "resident" : 6846, "virtual" : 416797, "supported" : true, "mapped" : 205549, "mappedWithJournal" : 411098, "note" : "virtual minus mapped is large. could indicate a memory leak" } Note: We are using 2.0.4 and now the default stack size should be 1MB per connection. The current number of connections is around 1.1K, but the non-mapped virtual memory (virtual-mappedWithJournal) is around 5699 MB. The trend is quite stable so I can't say there is a leak here, but where is the memory gone? Any idea?

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  • vmware player won't run on CentOS due to missing /dev/vmmon, what could be the problem?

    - by Graphics Noob
    So I've tried installing vmware player 3.1.4 and 3.1.3 and both times had the same problem, when I try to load a VM I get the error "Could not open /dev/vmmon". When I ls /dev/ I can see there is no "vmmon" device present. When I try running: sudo /etc/init.d/vmware start I get the output: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [FAILED] which shows that the Virtual Machine Monitor fails to load. I tried following the advice on this site and ran vmware-modconfig --console --install-all I notice during the compilation there are no errors, but at the end I get the message: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [ OK ] Unable to start services Out of curiousity I tried: sudo /sbin/insmod /lib/modules/2.6.18-238.9.1.el5xen/misc/vmmod.ko But got the error message: insmod: error inserting 'vmmon.ko': -1 Invalid module format I have a feeling this may be the root of the problem, but I don't know what could be causing it or how to fix it.

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  • vmware player won't run on CentOS due to missing /dev/vmmon, what could be the problem?

    - by Graphics Noob
    So I've tried installing vmware player 3.1.4 and 3.1.3 and both times had the same problem, when I try to load a VM I get the error "Could not open /dev/vmmon". When I ls /dev/ I can see there is no "vmmon" device present. When I try running: sudo /etc/init.d/vmware start I get the output: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [FAILED] which shows that the Virtual Machine Monitor fails to load. I tried following the advice on this site and ran vmware-modconfig --console --install-all I notice during the compilation there are no errors, but at the end I get the message: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [ OK ] Unable to start services Out of curiousity I tried: sudo /sbin/insmod /lib/modules/2.6.18-238.9.1.el5xen/misc/vmmod.ko But got the error message: insmod: error inserting 'vmmon.ko': -1 Invalid module format I have a feeling this may be the root of the problem, but I don't know what could be causing it or how to fix it.

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  • Prevent virtual host on same server interact on apache

    - by soosooo
    good day i Have a vps apache 2.0 webserver, with multiple domains and multiple ips set. In document root :/var/www/html/ -- i have http:// serverA.com and i create virtual host on folder :/var/www/html/serverB --- http:// serverB.com They work great for both. but the problem is, i can access serverB files with url http: // serverA.com/ serverB / (which i dont want that happen) how to prevent that ? thx in advance

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  • spring.net proxy factory with target type needs property virtual ?

    - by Vince
    Hi all, I'm creating spring.net proxy in code by using ProxyFactory object with ProxyTargetType to true to have a proxy on a non interfaced complex object. Proxying seems ok till i call a method on that object. The method references a public property and if this property is not virtual it's value is null. This doesn't happen if i use Spring.Aop.Framework.AutoProxy.InheritanceBasedAopConfigurer in spring config file but in this case i can't use this because spring context doesn't own this object. Is this normal to have such behavior or is there a tweak to perform what i want (proxying object virtual method without having to change properties virtual)? Note that i tried factory.AutoDetectInterfaces and factory.ProxyTargetAttributes values but doesn't help. My proxy creation code: public static T CreateMethodCallStatProxy<T>() { // Proxy factory ProxyFactory factory = new ProxyFactory(); factory.AddAdvice(new CallMonitorTrackerAdvice()); factory.ProxyTargetType = true; // Create instance factory.Target = Activator.CreateInstance<T>(); // Get proxy T proxiedClass = (T)factory.GetProxy(); return proxiedClass; } Thanks for your help

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  • Why do I have to specify pure virtual functions in the declaration of a derived class in Visual C++?

    - by neuviemeporte
    Given the base class A and the derived class B: class A { public: virtual void f() = 0; }; class B : public A { public: void g(); }; void B::g() { cout << "Yay!"; } void B::f() { cout << "Argh!"; } I get errors saying that f() is not declared in B while trying do define void B::f(). Do I have to declare f() explicitly in B? I think that if the interface changes I shouldn't have to correct the declarations in every single class deriving from it. Is there no way for B to get all the virtual functions' declarations from A automatically? EDIT: I found an article that says the inheritance of pure virtual functions is dependent on the compiler: http://www.objectmentor.com/resources/articles/abcpvf.pdf I'm using VC++2008, wonder if there's an option for this.

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  • VMware virtual machine network devices malfunctioning

    - by sheepz
    I'm running Ubuntu 10.04 LTS and VMvware workstation 7.0.1 build-227600. The virtual machine i'm running in VMware is a custom distribution built on Debian Linux version 3.1. I'm still pretty much a beginner with UNIX administration. After having messed around with the vmware (changed only the name of the folder, the vmx and and other .v* files accordingly in which the .vmx was situated, and the configuration in the vmx file accordingly), the network devices on the virtual machine do not work anymore. The virtual machine is used for securely sending messages. The virtual machine: As far as I know, this perl file called proxy-gen-ifalias eth0 is responsible for properly setting up the two virtual network devices eth0 and eth1. The Virtual machine comes with a GUI interface in which I have set up two ethernet network devices, one internal, the other external. Now, after having messed around with this, the UI gives me this error message: perl proxy-gen-ifalias eth0 /etc/modprobe.d/alias-eth0 /sbin/update-modules perl proxy-gen-ifalias eth1 /etc/modprobe.d/alias-eth1 /sbin/update-modules ifdown eth0 ifdown: interface eth0 not configured ifdown eth1 ifdown: interface eth1 not configured perl proxy-gen-netcfg /etc/network/interfaces ifup eth0 SICCSIFADDR: No such device eth0: ERROR while getting interface flags: No such device SIOCSIFNETMASK: No such device eth0: ERROR while getting interface flags: No such device Failed to bring up eth0. ifconfig eth0 eth0: error fetching interface information: Device not found make: *** [/etc/network/interfaces] Error 1 ~ Here are the contents of the two perl files referred to in the message: paste.pocoo.org/show/2AMzAYhoCRZqlGY7wUFk/ proxy-gen-netcfg

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  • Mod_Perl configuration for multiple domains

    - by daliaessam
    Reading the Mod_Perl module documentation, can we configure it on per domain basis, what I mean can we configure it to run on every domain or specific domain only. What I see in the docs is: Registry Scripts To enable registry scripts add to httpd.conf: Alias /perl/ /home/httpd/2.0/perl/ <Location /perl/> SetHandler perl-script PerlResponseHandler ModPerl::Registry PerlOptions +ParseHeaders Options +ExecCGI </Location> and now assuming that we have the following script: #!/usr/bin/perl print "Content-type: text/plain\n\n"; print "mod_perl 2.0 rocks!\n"; saved in /home/httpd/httpd-2.0/perl/rock.pl. Make the script executable and readable by everybody: % chmod a+rx /home/httpd/httpd-2.0/perl/rock.pl Of course the path to the script should be readable by the server too. In the real world you probably want to have a tighter permissions, but for the purpose of testing, that things are working, this is just fine. From what I understand above, we can run Perl scripts only from one specific folder that we put the directive above. So the question again, can we make this directive per domain for all domains or for specific number of domains?

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  • Virtual host config issues in osx 10.7 server app

    - by Benno
    I have two mac mini lion servers setup to run as production and staging machines. My sysadmin decided on these machines over the previous CentOS we had because it had an "interface" to be able to manage it, rather than just the terminal. To be honest, I prefer the terminal. My problem is, the mac osx 10.7 server.app seems to be having issues with the creation of virtual hosts in the 'Web' section. It seems VERY touchy. For example, I cannot create a http virtual host first. I have to create a https host first with a unique dns name 9e..g vuly6), then create the http host with a different dns name to the first (e.g. www), or it appears to override it the first one, even though one is ssl and one is non-ssl. Further, it seems to override perfectly good configurations at random. For example, the default sites directory is usually /Users/default/Sites/Customsites or something, but sometimes when I load the server.app it changes to /var/empty. Also, if I change or add extra virtual hosts after the first one or two, it starts to mess up and the first two virtual hosts start having issues. Has anyone had any experience with setting up virtual hosts via this app? Am I able to manually create these virtual hosts, without using the app, and without the app overriding my settings when I restart apache?

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  • How to find the real IP to which IPVS is routing a virtual IP

    - by Wayne Conrad
    I'm trying to find a problem server hiding behind a virtual IP (using LVS/ipvs). I've got a test program that sends requests to the virtual IP until it gets the bad response, but how can I tell to which real IP a request to the virtual IP got routed? On the box doing the virtual IP magic, here's the virtual IP configuration (for the service I care about): IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn ... TCP 10.1.0.254:5025 nq -> 10.1.0.5:5025 Route 1 0 1 -> 10.1.0.6:5025 Route 1 0 5 -> 10.1.0.7:5025 Route 1 0 2 -> 10.1.0.9:5025 Local 1 0 3 -> 10.1.0.11:5025 Route 1 0 3 ... My client program is sending TCP requests to 10.1.0.254:5025, usually getting a good response but sometimes a bad response. With this few servers, I could send my request to each server in turn until I discover the culprit, but I wonder if that technique will scale as we add servers. What means exist for me to find out where requests got routed? Kernel: Linux 2.6.32 OS: Debian testing (whatever that's called these days). ipvsadm is version 1.25, compiled with ipvs v1.2.1

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  • Membership in two domains

    - by imagodei
    Hello! I would your suggestions for an effective solution for a person, who needs to access resources in two Windows domains and wants to use one computer. It's about our CEO, who has accepted a second position in another company. Accessing files and folders isn't big problem. The greatest challenge I see is that he wants to conveniently access Exchange accounts in both companies; he would like to send and receive mail in single Outlook if possible (two profiles?) There is also a challenge with calendars: he would like to have one calendar for all activities from both Exchange accounts. Creating a POP3 account for accessing second Exchange server is a last resort, because obviously there is a problem with scheduling meetings and other calendar related tasks. Forwarding and receiving all mail/tasks on primary Exchange server is inconvenient because simple replying to original sender is disabled; and also when manually changing the recepient, he will receive mail from the wrong address. We were considering Virtualisation, that is setting up an instance of virtual machine inside existing installation and then joining this virtual computer to a second domain. Then installing another MS Outlook. This would of course mean two different Outlook accounts, two different calendars, but would at least enable our CEO to access all information from a single laptop. Does anyone have any other idea? I know setting up two domains on a single computer is a no-go (without much hacking at least), but effective workarounds are appreciate. The thing I am looking here is high usage/efficiency/productivity, but also as elegant solution from the administration point of view. Thank you very much (if you managed to read this through, this is a good sign ^_^ )

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  • Keepalived for more than 20 virtual addresses

    - by cvaldemar
    I have set up keepalived on two Debian machines for high availability, but I've run into the maximum number of virtual IP's I can assign to my vrrp_instance. How would I go about configuring and failing over 20+ virtual IP's? This is the, very simple, setup: LB01: 10.200.85.1 LB02: 10.200.85.2 Virtual IPs: 10.200.85.100 - 10.200.85.200 Each machine is also running Apache (later Nginx) binding on the virtual IPs for SSL client certificate termination and proxying to backend webservers. The reason I need so many VIP's is the inability to use VirtualHost on HTTPS. This is my keepalived.conf: vrrp_script chk_apache2 { script "killall -0 apache2" interval 2 weight 2 } vrrp_instance VI_1 { interface eth0 state MASTER virtual_router_id 51 priority 101 virtual_ipaddress { 10.200.85.100 . . all the way to . 10.200.85.200 } An identical configuration is on the BACKUP machine, and it's working fine, but only up to the 20th IP. I have found a HOWTO discussing this problem. Basically, they suggest having just one VIP and routing all traffic "via" this one IP, and "all will be well". Is this a good approach? I'm running pfSense firewalls in front of the machines. Quote from the above link: ip route add $VNET/N via $VIP or route add $VNET netmask w.x.y.z gw $VIP Thanks in advance. EDIT: @David Schwartz said it would make sense to add a route, so I tried adding a static route to the pfSense firewall, but that didn't work as I expected it would. pfSense route: Interface: LAN Destination network: 10.200.85.200/32 (virtual IP) Gateway: 10.200.85.100 (floating virtual IP) Description: Route to VIP .100 I also made sure I had packet forwarding enabled on my hosts: $ cat /etc/sysctl.conf net.ipv4.ip_forward=1 net.ipv4.ip_nonlocal_bind=1 Am I doing this wrong? I also removed all VIPs from the keepalived.conf so it only fails over 10.200.85.100.

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  • How to place a virtual machine in DMZ?

    - by Giordano
    I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products we're developing and make available other products for demo purposes. One of the server NICs is configured with a public IP. However before exposing anything on the web I would like to be sure that if one of the virtual machines get compromised, the attacker doesn't reach the rest of the hosts. What I would like to do is to put these virtual machines into a DMZ. These are the steps I'm planning to do: Create a tap interface in the virtualization host (let's say tap1) Create a bridge using tap1 and give it an IP in a subnet separate from the other hosts. Let's say 10.0.0.1 Attach the DMZ virtual machines to the bridge and configure their IP statically (10.0.0.2, 10.0.0.3, etc...) Using UFW, forbid any traffic from 10.0.0.0/24 to any of the internal hosts, allow the traffic from the internal hosts towards 10.0.0.0/24 and expose the virtual machines on the web using port forwarding. Do you think this setup is safe? Can you suggest any improvement or a better/safer approach? Thanks in advance!

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  • ubuntu 12.04 kvm virtual server network setup, can't get the machine to be connectable

    - by xyious
    I have worked on my Ubuntu Server host for weeks now and I just can not manage to get the virtual machines into the network.... here's what I need to do: I need to be able to create virtual machines that have IP addresses that can be reached from the outside (192.168 network). I need to be able to connect to the virtual machines through ssh, ftp, http and preferably https, anything else doesn't matter that much. So far everything seems simple enough and I have a lot of leeway in terms of IP address range and server/client configuration. I have the option of taking part of a /24 net as most IPs aren't used, and if it's absolutely necessary I have the option of creating a new /24 subnet. Also have the option of reformatting and reinstalling OS on the host and recreating the virtual machines as nothing has been done other than trying to get virtual machines to work. I would prefer if the virtual machines were just part of the normal network which would be 192.168.5.0/24. The host machine has 2 network cards so I don't even necessarily need the Host to be connectable in the same /24 network. I have tried (I think) just about everything from about 5 different tutorials on bridging (giving br0 the same IP that eth0 used to have (Host is able to connect to VM and vice versa, VM doesn't have outside network access), having eth0 set up like it always was and having br0 have a different IP (same as above), NAT with port forwarding (which I would have preferred not to use but will if it works), turning off one of the hosts network cards and just using one of them, different subnets.... etc. I do know my way around iptables fairly well.... Host is 64bit Ubuntu Server 12.04, using libvirt/kvm. edits: Local network is 192.168.5.0/24, host has static ip 192.168.5.254, GW .5.1 which is also nameserver. We have a second Local network at 192.168.10.0/24 with .10.1 GW, but both hosts and VMs were supposed to go into the .5 subnet. The .10 subnet isn't required, but it wouldn't be horrible if the Host were only accessible in the .10 subnet.

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