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  • Virtual destructors for interfaces.

    - by wowus
    Do interfaces need a virtual destructor, or is the auto-generated one fine? For example, which of the following two code snippets is best, and why? class Base { public: virtual void foo() = 0; virtual ~Base() {} }; OR... class Base { public: virtual void foo() = 0; };

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  • Memory overcommitment on VmWare ESXi 5.0

    - by Tibor
    I would like to understand better the possibilities of VmWare ESXi memory overcommitment. I've read this paper from VmWare, so I am familiar with general concepts, such as hypervisor swapping, memory balooning and page sharing. It seems that a combination of these techniques allows for quite a large degree of overcommitment. However, I am not sure. I am deploying a virtual test lab comprising of 4 identical sets of virtual servers and workstations and a couple of virtual router instances. Overall, I expect to be running around 20 virtual machines with Windows XP, Windows 7 and Ubuntu for workstation hosts as well as CentOS and Windows 2008 Server instances for servers. The problem is, however, that the host machine only has 12GB of RAM and I don't have an option to stuff in some more. I would like to know what is the best option to configure hosts in order to achieve reasonable performance within the constrains. I have these two options: Allocate as little as possible of RAM to each virtual machine. Allocate an extraordinary amount (such as 4 GB per instance) and let the baloon driver do the rest. Something else? Which would work better? Machines will mostly be idle, so I don't have any major performance expectations, but they should run reasonably smoothly nevertheless.

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  • How to set local alias for a machine?

    - by Alex G.
    I would like to set an alias on my local PC for a network machine. I know that it can be done by adding an entry in the hosts file as long as the IP address of the machine is also specified. However, the problem is that IPs are dynamically assigned by a DHCP server so I don't know for sure the IP address. Is there a way to define just an alias based on the machine's network name? P.S.: I'm running Windows Server 2008 R2.

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  • Inbound connections to a ubuntu machine running a VPN

    - by shanedowling
    Is it possible to open inbound connections to a machine connected to a VPN server? The machine is running ubuntu 9.10 with two network devices(a wireless card and ethernet port), I can connect to my machine locally using a local ip but when I try port forward using my router I can't connect from my external ip. Is there a way around this? I figure with 2 network devices I can vpn over one and use the other for inbound connections but I can't figure out how to do this. Thanks

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  • Hyper-V VM's cannot access Host resources, and vice-versa

    - by Agent
    I have several Hyper-V vm's running on this Win2008 R2 Server box, and up until a reboot of the host server, all the VM's were able to access shared folders on the host. Now, they can't even ping the host server. From what I've seen, I need to setup an Internal only network through Virtual Network Manager in Hyper-V. I set this up, then tried to enable the Microsoft Virtual Network Switch Protocol option in this Internal Only NIC, but I get popups saying: Your current selection will also disable the following features: Microsoft virtual network switch protocol Which is absolutely stupid, considering the protocol is what I'm ticking the checkbox to Enable! As of now, on the host, I have 2 NICs: Physical - This NIC on the host machine does have the MVNS protocol enabled Virtual Network Adapter - Created through Hyper-V Virtual Network Manager as an External type of network. Trying to enable MVNS on this NIC also produces the error above. I've tried enabling Client for Microsoft Networks on the physical NIC for IPv6, but everytime I do that, all the VMs lose Internet connectivity and I cannot RDP into them. Anything else I can try?

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  • Recovering database files from a corrupted VHD

    - by Apocalypse9
    We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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  • Hyper-V VM guest can't ping any machine

    - by Haadka
    So I got Host: Hyper-v enabled machine with four NICs, only one enabled. Network type: External IP configuration are correct for both host and guest (getting it from the DHCP of the company network) The same configuration works on a machine with single NIC But With this other machine, with 4 NICs, there is no Internet in the guest, actually it can't ping any IP expect the host (pings host IP only, not the name) I searched the Internet and did every solution, more than once, with no success.

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  • Migrating users and IIS settings from a workgroup win2k3 machine to a new win2k8r2

    - by amber
    I am retiring my old Windows Server 2003 Standard 32bit machine to a new machine with Windows Server 2008 R2 Standard. The two sticking points are migrating user accounts (and there are a lot of them) and IIS settings/websites (again, there are a lot). The new machine has not been provisioned yet. I'm at that point where I'm about install the OS on it. The old machibe is configured with a mirrored set for its OS and data partitions. I have broken the mirror set, replicated all of the data to an external drive, and then rebuilt the mirror set. In short, I have an image of the old machine to play with while safely leaving it up and running. Thanks!

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  • very Slow machine when searching the network

    - by Adam
    Hi We are using a Dell desktop machine with 2 GB RRAM & Pentium D 3.00 GHz. The machine is very slow when using our Sales program and searching over the local network. We have this problem on 2 machine which are the same spec - This one and another. All of our other machine (10) run fast with no issues. Our server is SBS 2008 and AV is AVG. All of our client machines are WinXp Pro SP3 using the latest drivers. Any ideas?

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  • File command output is different for same file on diff machine

    - by Coka
    I get different output of file command on same file(checked inode) from different machines. One of the machines is with suse10 sp3 and the another - rhel4. machine1>file x.tcl x.tcl: ASCII English text machin2>file x.tcl x.tcl: data Even in vi editor same file look different from different machine. Any clue? One more thing - there's third machine suse10 sp3 works fine. Is this machine issue?

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  • Performing task on remote window server 2003 machine

    - by Vaibhav Jain
    I have to perform various task such as restarting process, monitor process state check disk space, log monitoring on Window server 2003 machine. For this i am using remote desktop access which is very slow. Is there any alternate (Tool or Framework) for windows server where i can execute my script on my machine and the required task will be performed on the remote machine in somewhat interactive manner (like putty in linux)

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  • How do I fix my VM's network connection if it seems to be running ok from the host?

    - by AndreiC
    I have a virtual machine (made with vmware) with a linux ubuntu os installed on it (i have a series of them), with NAT network connection - i am running vmware on Windows XP (my host system); the virtual machine can't connect to the internet. All the vmware services seem to be working fine from windows point of view, but inside the machine i can't connect to the internet. What is strange is that the virtual machine was able to use the internet some time ago, but all of a sudden, i just can't use my internet on the virtual machine - i have made no changes to the settings, nor in windows, nor in the virtual machine - so i don't understand.

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  • run ubuntu from virtual box in an external hard drive

    - by Bhavan
    I would like to run ubuntu on my external hard drive. I have got virtual box installed in the external hard drive and made a machine named ubuntu and installed the latest ubuntu version which i got from the .iso download. Now after much juggling around i got ubuntu running on the machine which i did the whole installation. When i move it to another machine the virtual box just woudnt open. What is the reason for this and how can i get the ubuntu run from whichever machine i plug in the external usb hard disk. Thanks a lot for your answers in advance. Best regards Bhavan

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  • Wait for linux machine to be rebooted

    - by Theo
    I have a small script to install on my remote machine an update. I would like to reboot the machine remotely and if it is rebooted, continue with some more commands. What I currently do is: ssh root@myMachine << COMMANDS_ISSUED ###... Tasks init 6 COMMANDS_ISSUED sleep 180s ssh root@myMachine << POST_REBOOT_COMMANDS ###.... More stuff POST_REBOOT_COMMANDS Is there a more elegant way to do it? Like pinging the machine all 5 seconds up to a maximum of 4 minutes? I play with a few linux machines which have different boot up times and if my script would continue immediately after reboot, this could safe quite some time for me. (Note: I don't want to parallelize execution over all machines as I want to see for each machine if everything worked fine)

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  • Windows 2008, IIS7 and virtual directories

    - by Thomas
    I created a virtual directory called test (C:\test) under the Default Web Site and added two simple test files (one html and one aspx). I thought I had to add the IUSR and NetworkService (for application pools) to C:\test and grant the users appropriate rights in order for IIS7 to serve the content. It appears that is not the case at all as I can view any files in the virtual directory (even if I convert it to an application) without changing or adding any security settings on the C:\test folder. I just installed IIS7 with ASP.NET on Windows 2008 without changing any settings besides adding the virtual directory. Am I missing something? Even my book on IIS7 states that the user accounts should be added an appropriate rights should be added. I added the following to answer the comments: I am referencing the file using a public IP http://xxx.xxx.xxx.xxx/test/one.html and the IP nor localhost is in my trusted sites. I am not signed in on the server at all as I am accessing the content from my home machine and the content is on my production server. The following users/groups have access to c:\test on the server (Creator Owner, System, Administrators, Users) and the app pool is running under the default NetworkService account. I basically installed win2008, added the IIS role with asp.net. I then opened IIS7, added a virtual directory and copied two files to the directory to test. It works which is great but I want to understand why it works. How is it that IIS7 can access files in the C:\test folder without any permissions set.

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  • Virtual SMTP not sending mails

    - by DoStuffZ
    Hi I have been googling for the better part of the last two hours without finding any conclusion. My mails are not being sent from the production webserver. If I stop/start the Virtual SMTP I get this in the event log: No usable TLS server certificate for SMTP virtual server instance '1' could be found. TLS will be disabled for this virtual-server. We recently updated the webapplication running and I assume something went amiss during that. Googling the message straight up gave me a list that just as well could have been in greek. I found a security certificate on the server, installing that gave no change. I basicly played russian roulette with the certificate file (.cer), though I was somewhat certain it would not have a negative effect. (Russian roulette with a 6 chamber gun and 2 bullets.) I found a .pfx in our local documentation folder, though I'm far from certain that to have a positive effect. (6 chambers and 5 bullets). I found a site describing how the Virtual SMTP - Properties - Access - should have a button saying Certificates. I have a text saying "Did not find any TLS certificates" and a grayed out tick box saying "Require TLS certificate". I found the TLS being SSL ver3.1+ (3.1-3.3). So question goes - How do I enable the SMTP to once again send emails, like before.

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  • high virtual memory usage in openvz?

    - by freedrull
    We're having a lot of memory problems on a new OpenVZ box. It is supposed to have 1 gig of memory, I'm not sure how much of that is burstable or guaranteed memory. Programs in general seem to take up more virtual memory than they do on my box at home, and on our other OpenVZ box. I wrote this simple C program: #include <stdio.h> #include <stdlib.h> int main(){ char *thingy = malloc(500); getchar(): return 0; } So it simply allocates 500 bytes and then returns. I ran the program on 3 computers. On my home machine, and our other OpenVZ box it shows about 1k bytes of virtual memory being used. On the new problematic machine its about 3k. I know this is just virtual memory and not resident memory, but why is this machine allocating so much virtual memory? Are there some settings I need to adjust to the OpenVZ memory settings? I tried changing the stack size with ulimit -s 256 and restarting some demons, but I still saw the same results. I'm doing all of my monitoring with htop, is this even a good program to use with a OpenVZ vps? I've read I should be parsing the output of /proc/user_beancounters intead or something.

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  • Virtual Wifi Issue Windows 7

    - by Matt
    Lately I've been trying to use my laptop as a wireless router in my room. I have it connected to my school's network through ethernet, and I want to set up wireless so that I can use Wifi on my Android phone and iPod Touch. In the past, I used Connectify, but I started having an issue where my phone would find the network, connect, attempt to get the IP, and then suddenly the network would disappear. Then it'd pop up again, and the same process would happen over and over. I decided that I'd totally uninstall Connectify, but after that, neither Virtual Router Manager nor the command prompt could create a viable network either. My phone and even my iPod now encounter the same problem. Neither can successfully connect. So evidently there is something wrong with the laptop's virtual wifi feature, and I have no idea what that could be. I've tried enabling certain services that virtual wifi supposedly relies on, but some of them don't start, namely Remote Access Connection Manager. But I also have read that these enable on their own and that if they are normally not enabled it's fine. Furthermore, I even uninstalled and reinstalled the drivers for my wireless card. Any ideas as to why my virtual wifi won't function? Anything? I really would love to get this working...

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  • Accessing Virtual Host from outside LAN

    - by Ray
    I'm setting up a web development platform that makes things as easy as possible to write and test all code on my local machine, and sync this with my web server. I setup several virtual hosts so that I can access my projects by typing in "project" instead of "localhost/project" as the URL. I also want to set this up so that I can access my projects from any network. I signed up for a DYNDNS URL that points to my computer's IP address. This worked great from anywhere before I setup the virtual hosts. Now when I try to access my projects by typing in my DYNDNS URL, I get the 403 Forbidden Error message, "You don't have permission to access / on this server." To setup my virtual hosts, I edited two files - hosts in the system32/drivers/etc folder, and httpd-vhosts.conf in the Apache folder of my WAMP installation. In the hosts file, I simply added the server name to associate with 127.0.0.1. I added the following to the http-vhosts.conf file: <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot "c:/wamp/www/ladybug" ServerName ladybug ErrorLog "logs/your_own-error.log" CustomLog "logs/your_own-access.log" common </VirtualHost> <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot "c:/wamp/www" ServerName localhost ErrorLog "logs/localhost-error.log" CustomLog "logs/localhost-access.log" common </VirtualHost> Any idea why I can't access my projects from typing in my DYNDNS URL? Also, is it possible to setup virtual hosts so that when I type in http://projects from a random computer outside of my network, I access url.dyndns.info/projects (a.k.a. my WAMP projects on my home computer)? Help is much appreciated, thanks!

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  • Attempting to set up xampp and zend server on the same machine

    - by umbregachoong
    I am attempting to set up the zend server and xampp on the same machine but I am running into problems. I came across documentation on the zend site that said you cannot do this. However the folks over at apachefriends said you can. I have since discovered that I can run some of the zendframework examples within xampp by downloading the zendframework2 library and the skeleton app from git and I am doing this right now. However, I would like to know how to set them both up without having any conflicts both for the apache2 server and phpmyadmin. (One of the frustrating things is trying to load phpmyadmin in the deployment dialog by using the zpk tool in Zend). What I did in trying to set up both servers on windows 7 is as follows: First I have tried to set up the httpd conf files separately for each server, xampp running on port 8082 , and zend running on port 8088. At the time xampp would work, but zend server would not. This is after setting up the virtual host files separately for each server. Question 1: Where are the zend server error logs? Earlier, I was able to get both of them running configuring the xampp server httpd-conf file alone, however, I experienced problems with phpmyadmin even after configuring phpmyadmin on xampp to work on a different port other than 3306. Second question here: how to set up the two mysql phpmyadmin instances so they do not conflict with each other? Here is the xampp virtual host section: ##ServerAdmin [email protected] DocumentRoot "C:/xampp/htdocs/" ServerName localhost 8082 ##ServerAlias www.dummy-host.example.com ##ErrorLog "logs/dummy-host.example.com-error.log" ##CustomLog "logs/dummy-host.example.com-access.log" common Here is the zend virtual host section: DocumentRoot "C:\Program Files (x86)\Zend\Apache2/htdocs" ServerName localhost:8088 </VirtualHost> I have looked at this httpd.apache.org/docs/2.2/vhosts/ and this http://survivethedeepend.com/zendframeworkbook/en/1.0/creating.a.local.domain.using.apache.virtual.hosts but I am obviously doing something wrong here. I also have the java sdk running on this machine with tomcat and apache and I have no conflicts- too bad this is not the case for zend server and xampp Thanks umbre gachoong

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  • trying to figure out how to bridge two virtual networks together and in turn bridge that to the internet for a virtual inline IDS/IPS system

    - by Tony robinson
    I'm trying to figure out how to bridge two vmware (server or workstation, workstation) or virtualbox networks together with a linux IDS/IPS system transparently inline between both the virtual networks. How do I accomplish this? I understand how to bridge to virtual networks together, but how to I make the linux virtual machine sit between them and force traffic to go across the transparent bridge? I would like to have something along the lines of: vmnet a various vms host-only network ---- inline linux box vmnet a boxes forced to go through here to get to the internet --- vmnet b network with internet access configured as either NAT or bridged -- internet I know that basically the linux box needs two virtual nics, one on vmnet a and vmnet b, but other than that, I don't know how to force all the traffic to go across the "transparent" bridging linux box on its way to the internet. Do vmnet a and b have to be the same ip network with the same default route? does vmnet a not have a default route and vmnet b have a default route? I've read in vmware forums that on the linux host you need to change permissions on the vmnet files for promiscuous mode? is this true? how do you configure this scenario on a windows box?

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  • Server 2003 Remote Desktop loses its virtual printer image of the local printer

    - by Charles Hart
    Server 2003 Remote Desktop provides service to stores served by several ISPs. The server loses its virtual printer image of the local printer (as seen from the remote store site) and a copy of the original local printer appears on the local computer with a different driver without notice. Specifically: A remote desktop session is opened on a local computer that has a Brother HL2140 USB printer connected and the associated software installed with a correct driver shown under the “advanced” button. The server has the same Brother software and driver. An application that is running on the server attempts to print on the local printer connected to the local computer running Vista Pro or XP Pro. Either it works correctly (Good) or it does not print (Bad) or it prints on another Local Printer connected to another local computer logged into the server (Bad and Odd). When it doesn’t print (or prints somewhere else) we ask the customer to look for the (virtual) printer using the Remote desktop view of the server and the printer is gone. Then we ask the customer to look at the printers folder in the local computer. There are several possibilities: The printer is there, but the driver is mysteriously changed in the drop down to MDX something; we have the customer select the other (proper) Brother driver, and all is well again, as now after the change, the virtual printer in the server (which now matches the local printer) appears again, and so printing can resume. A “copy” of the printer mysteriously appears in the local printer’s folder and after we delete it the virtual printer in the server appears again and so printing can resume. Note that in both case 1 and 2, the server sometimes sends the print job elsewhere, to some other local computer. Meanwhile in the log file, endless errors are reported and the server eventually crashes, sometimes twice a day. I’m puzzled what changes the local printer driver and I’m puzzled what loads the copy 2 or copy 3 of the printer in the local printer folder. This entire description randomly occurs on any of 40+ local computers in eight different locations in different ISPs, all sharing one Domain.

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  • pfSense Load Balancer and Virtual IP

    - by jshin47
    I have two identical web servers on 10.2.1.13 and 10.2.1.113. I would like to set up pfSense load balancer to balance requests to both of these. I set up pools that included HTTP and HTTPS for both of these hosts, then set up virtual servers that responded on HTTP and HTTPS and referred traffic to its respective pool. However, I set up the virtual server to listen on 10.2.1.213, a LAN IP rather than a WAN IP, because I want LAN traffic to be able use the load balancer virtual server as well. So, I set up a Virtual IP for 10.2.1.213 on LAN IP, and a NAT port forwarding rule for HTTP and HTTPS traffic on a WAN IP to forward to 10.2.1.213. It seems like this should work, but it fails. What eventually happens is that when I try to access the page from WAN, I am directed to the login page for my pfSense device rather than the page I am expecting. When I try to access 10.2.1.213 from LAN, the request times out. What is going wrong here? I have tried it with and without NAT reflection to no avail. Please advise

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  • How to extend a Linux PV partition online after virtual disk growth

    - by Yves Martin
    VMware allows to extend the size of a virtual disk online - when the VM is running. The next expected steps for Linux system are: extend the partition: delete and create a larger one with fdisk extend the PV size with pvresize use free extents for lvresize operations and then resize2fs for file system But I am stuck on the first step: fdisk and sfdisk still display the old size for the disk. My disk is a SCSI virtual disk connected thanks to the virtual LSI Logic controller. How to refresh the virtual disk size and partition table information available in Linux kernel without reboot ? As far as I know all that steps are possible for a running Windows, without reboot and even without any user actions thanks to VMWare tools. On Linux, I expects to do all steps online too and I already know steps 2, 3 and 4 work online. But the first one - change partition size declared in the partition table (still) seems to require a reboot. Update: My system is a Debian Lenny with kernel 2.6.26 and the disk I have extended is the main disk with a large PV containing the "root" LV for "/".

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