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  • What is the difference betweeen "Network install" and "Network Boot" options in virt-manager when installing a new virtual machine

    - by Marwan
    From my understanding of PXE (Preboot Execution Environment), I know that there must be some negotiation first between the booting client and a DHCP server to obtain network parameters (IP address, etc) in order for the client to be able to fetch the boot loader and kernel image from the boot server. In other words, and aside from being a "virtual" machine, we're talking here about a "bare metal" machine, so there must be some "pre boot" mechanism for those negotiations to take place, and this is exactly what PXE is all about. When I think about the "Network install" option, I can't figure out how the new VM would be able to fetch the boot images (bootloader and kernel) without the previously mentioned mechanism. So, here is a short version of the question: When provisioning a new virtul machine, how do you expect the "Network install" option in virt-manager to work behind the scenes? Many thanks.

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  • Can I provision half a core as a virtual CPU?

    - by ramdaz
    I am virtualization newbie. Please advise on these questions. Please note using a commercial VM software like Citrix or VMware is not a choice for me. I have at my disposal a couple of 2x 4 core servers with 32 GB RAM. I need to create 16 VMs on each server to test some web applications. Can I provision half a core as a virtual CPU for each VM? To my best knowledge I can't do so on Xen. Is it possible on KVM or some other free open source VM solution? If it's not possible to assign half a core, how do I ensure that uniform processing power is available for all VMs? Since the job is to create separate instances for hosting 16 web apps in a physical server, do you recommend setting up a private cloud using Ubuntu Enterprise Cloud as a better option? Is there HA solution under KVM, like Remus for Xen?

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  • Best way to keep a MS DOS application alive? (Virtual MS DOS)

    - by user11010
    Hi, I have a good old DOS application which is still required to run. Unfortunately the PC is dying and needs to be replaced. The PC was running Windows 98 and the software was executed in a MS Dos Command line. When we would order a new PC you would at least get a Windows XP which has the Win 2000 (NT) Kernel and is not DOS based. Now I need a strategy to be able to run a that DOS application on a new age PC. What I was thinking is to buy a standard office box and have a virtual PC or VMware setup which is running MS DOS and my DOS application? Would this be a way to go? Any concerns? What about 16Bit/32Bit… So any opinion, experiances or tip would be great …. Thanks

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  • Good way to run commands on remote computer without its own public-facing IP address (Linux Centos)

    - by Chris Dutrow
    Have a few computers running Linux Centos 6.4. They are connected to an unmanaged switch, which in turn, is connected to a router (Verzion Fios issue). What is a good way to "log in" to one of the computers so that I can run commands? Do I need to use SSH, or something different? Since the computers do not have their own public-facing IP addresses, do I need to set up some kind of port forwarding within the router? What is a simple, reliable way to accomplish this? Thanks so much!

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  • How to disable Tcp/Ip settings in windows 7 via GPO?

    - by Akash Kava
    I have enabled following policies, "Prohibit TCP/IP advanced connection" "Prohibit access to properties of components of a LAN connection" "Enable Windows 2000 Network Connections setings for Administrators" after doing all these, all machines running windows xp, 2000 and vista have network settings properties button disabled as expected. However all machines running windows 7 have no effect, I believe there are few more steps, all Windows 7 machines are on domain and we want to control this via Domain Controler's GPO. Please let me know, what I need to do to have Windows 7 disable the properties of network connection, I am not network expert, I read few articles about what new has been added in GPO of windows 7 but I am blank. Everything works fine on Windows XP, Vista, 2003 Server. Only Windows 7 is a problem.

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  • Virtual guest does not have network access in cafe.

    - by blee
    My Virtualbox guest OS (Ubuntu on ubuntu host) does not connect to the internet when I have wifi access through an internet cafe system. By this, I mean where your browser redirects to an internal web page where you can enter a code. On the guest, I can successfully connect to the virtual network adapter, but I do not get internet access, nor a redirect to the internal web page. I use OpenDNS for the host. I have no problems when connecting through ethernet or regular wifi. Can someone tell me any of: 1) How to fix the problem. 2) How such cafe systems work. 3) At least point me to a technical explanation of such a cafe system so I can begin to troubleshoot. Thanks!

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  • Why won't vsftpd let me log in with a virtual user account?

    - by Ramon
    I would like to use vsftpd with virtual users and pam_pwdfile.so. I installed vsftpd and added two users (ramon and dragon) via htpasswd to my file /etc/vsftpd.passwd. The /etc/pam.d/vsftpd is configured to use this file. auth required pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed auth required pam_pwdfile.so pwdfile /etc/vsftpd.passwd account required pam_permit.so @include common-account @include common-session The user "ramon" is also available in /etc/passwd. A login to the ftp with the user "ramon" works as expected. But a login using "dragon" does not :/ The result is always Login failed: 530 Login incorrect. Since it's possible that I made a mistake I tried the exact way documented in /usr/share/doc/vsftpd/examples/VIRTUAL_USERS/README. Still no luck. I can login with the user "ramon", but not with the user "dragon". Any ideas?

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  • For virtual machines, when SMP is available on the host, should guest also have SMP setup?

    - by supercheetah
    I'm trying to find out the best "bang for my buck" so to speak in regards to virtual machines, and SMP. I have an Intel Core 2 Duo, which of course has two cores and the VT extensions, and I'm running Ubuntu Linux (host) on it with VirtualBox, which has Windows Vista (guest). Currently I've got the guest machine setup for two processors to give Windows a chance to manage its own parallelism, but I'm not certain that it's any faster. I've tried it with just one processor, but it's hard to tell if it's any better. Any thoughts? Should the guest have two processors setup?

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  • How to SSH into Red Hat Linux (virtual box guest) from Windows 7 (host)?

    - by Gary Hunter
    I have RHEL running in Virtual Box and my native OS is Win 7. From a purely educational standpoint, I want to be able to access RHEL from Win 7 over SSH. I download putty but don;t know how to make it do what I want. Ideally, I would like to use the linux command prompt at a minimum and preferably access the GUI apps also. IS this possible? I am just trying to explore and expand my linux knowledge. Thanks for your time. Gary Hunter

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  • When trying to copy a virtual disk in VMware vSphere client, I get an errror.

    - by Zak
    I'm pretty new to all the VMware world, so this is probably mainly a question about the right set of documentation to look at. I'm trying to clone/copy a VM that I installed on an ESXi installation. I was trying to follow along with the top example here: http://serverfault.com/questions/16320/is-there-a-way-to-clone-an-existing-vm-on-an-esxi-server-without-having-to-re-imp However, I'm using the vSphere client to connect to the ESXi box and manage it, and the vSphere client is telling me it won't let me rename the vmdk file. The real answer I want is how do I clone the VM I installed if I want to spin up 5 copies. Is there another utility I can use to copy the vmdk file, then create a new virtual machine using it? Any idea why they nerfed the feature in vSphere client?

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  • Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

    - by mcfrosty
    I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up where my virtual windows box talks to the Mikrotik via private or internal network on the Hyper-V host. I can get the two machines to talk, but as soon as I set up a bridge on the MT, all traffic ceases between the two. Is it possible to create a bridge for this purpose (having the MT silently in front of my firewalled server)? I could really use some help.

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  • Howto return to virtual machine when remote desktop hangs?

    - by tangens
    I'm using a vmware virtual machine running ubuntu linux and from there I connect to a Windows XP machine using rdesktop through a VPN tunnel. This configuration is given and cannot be changed. From time to time my internet connection does a reconnect. Then the running rdesktop (running in fullscreen mode) process freezes and isn't usable anymore. Now I want to return to the underlying linux and restart the rdesktop process. But I'm not able to get out of fullscreen rdesktop mode and so I cannot access the ubuntu desktop to kill any process. My solution is to reboot the vmware and start the rdesktop again. Is there a better way to get the configuration running again after a freeze? EDIT: I have no admin rights for the linux system. Everything must be done with user rights.

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  • Virtualmin - Added Virtual Server - Stopped access to Rails app?

    - by Dan
    Hi, Sorry if this sounds pretty simple, I'm new to Virtualmin and running servers in general. I recently purchased a VPS and installed Virtualmin with no problems. I then installed mod_rails and uploaded my first rails app, which I got working by adding the following to my apache httpd.conf file: <VirtualHost *:80> ServerName testing.mydomain.com DocumentRoot /home/myapp/public <Directory /home/myapp/public> Allow from All AllowOverride all Options -MultiViews </Directory> RailsBaseURI / </VirtualHost> I then tried adding a virtual server through Virtualmin, using mydomain.com. Now, the site this created (plus several sub-servers) and working as expected. However, my original Rails app is no longer accessible. The URL now sends me to the parent application (ie mydomain.com) The Rails app is not located within the parent's application directory, would this be a problem? Can anyone help? Any advice appreciated. Thanks.

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  • VMWare Player guest does not re-aquire IP on bridged interface after host loses and re-acquires network connectivity

    - by Vineet
    I am running a Ubuntu Linux image in VMWare Player on my laptop. The host is Windows XP. There are two network adapters configured in VMWare Player - one is host-only and the other is bridged. Everything works fine as long as the host does not lose network connectivity. If the host loses connectivity (even briefly) and then re-acquires it, my bridged adapter in VMWare Player is still unable to get an IP address. The host-only adapter remains unaffected. Disconnecting/Reconnecting the bridged adapter does not help. Simply restarting the guest OS does not help. Restarting VMWare Player does not help. The only remedy is to reboot the host and then bring up VMWare Player all over again. Is there something I can try to avoid this reboot? I searched the existing questions but they seemed to talk about adapters in NAT mode, whereas I am interested in retaining Bridged mode.

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  • Why would my router have different MAC addresses for IP and IPv6 transactions?

    - by user329161
    Today I was using tcpdump and I noticed my computer was having IPv6 traffic with a particular MAC address that I could not match with an IP using nmap or arping. After looking at the tcpdump logs a little more closely, I figured out it was another MAC address my router was using but exclusively for IPv6 traffic. 22:49:01.936830 90:0d:cb:ff:31:91 (oui Unknown) > 33:33:00:00:00:01 (oui Unknown), ethertype IPv6 (0x86dd), length 158: fe80::920d:cbff:feff:3191 > ip6-allnodes: ICMP6, router advertisement, length 104 Why would a router offer a different MAC address for IPv6?

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  • Virtual Box Networking; How to configure bridged networking on Windows 7

    - by Krist van Besien
    I have VirtualBox on Windows 7. I have two virtual machines running RHEL, that work fine when the network is set to NAT. However I want to change the network adapters for the VM's to bridged in stead of NAT. However when I go in to the VM configuration, and select bridged I also need to select an adapter, but there is nothing to select. Apparently I need to install a separate driver/filter on the network adapter. However I don't know where to start. I reinstalled VirtualBox (latest version) but did not see an option to install such driver. What should I do?

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  • Separate php.ini file for each Apache virtual host?

    - by Calvin L
    Is it possible to have a separate php.ini file that overrides the default php.ini file for each virtual host? I'm running Apache/2.2.14, PHP 5.3.2-1. For example I have several vhosts pointing to domains in my /var/www/ directory: /var/www/website1.com /var/www/website2.com What I'd like is to be able to place a custom php.ini file in each directory that would override the default values only for that vhost, but keep the original defaults if the value isn't specified: /var/www/website1.com/htdocs/ /var/www/website1.com/php.ini EDIT: I found more info on the topic here for those interested: http://serverfault.com/questions/34078/how-do-i-set-up-per-site-php-ini-files-on-a-lamp-server-using-namevirtualhosts

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  • How to Configure IIS 7.5 to Host Several Classic ASP Sites using 1 IP Address?

    - by SidC
    We are running Windows Server 2008 R2 with IIS 7.5 and have 4-5 Classic ASP sites to install. The main site is stored in wwwroot and the other sites are stored in folders below wwwroot. We have 1 IP address for the server. How do I configure IIS to allow folks to browse/test the sites before domain names are pointed to te server? When I setup one of the sites in a subfolder of wwwroot and assign a separate port to it, I receive a message stating: Config Error Cannot add duplicate collection entry of type 'add' with unique key attribute 'value' set to 'index.asp' How do I remedy this error and permit IIS to render the site?

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  • How can I avoid repeating DocumentRoot in this Apache virtual host?

    - by David Faux
    I have an Apache virtual host configured for a website powered by Wordpress. <VirtualHost *:80> ServerName 67.178.132.253 DocumentRoot /home/david/wordpressWebsite # BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteRule ^index\.php$ - [L] RewriteCond /home/david/wordpressWebsite%{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule> # END WordPress </VirtualHost> How can I avoid hard-coding /home/david/wordpressWebsite twice? I don't want to use REQUEST_URI since that involves an extra request.

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  • How to vertically split widescreen into two virtual workspaces on ubuntu/gnome?

    - by David
    My new laptop has a big 16:9 screen, and I'm finding it hard to fully utilize it during the 95% of the time that I'm not watching HD movies on it. I'd like to set it up as a kind of virtual dual screen by splitting the physical screen into two workspaces. I know I could arrange my windows manually, but I'd like to be able to maximize a window and have it only consume half the monitor, and have its pop up dialogs centered on its half-screen, that sort of thing. Is there some kind of plug in available to do this? Thanks in advance for any pointers.

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  • Can I set up a COM Port that Connects via TCP/IP?

    - by Kristopher Johnson
    I have an RS232 device connected to a Digi PortServer on my network. I can telnet to the Digi's IP and port number to communicate with that RS232 device. I have a Windows application that knows how to talk to the device, but it wants to connect directly to an RS232 port. So, my question: Is there some way to set up a COM port so that when this application connects to it, it goes through the network to the Digi to communicate with the device? I have run across the utility TCP-Com, which seems like it might be a solution. Is this the best option?

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  • using iptables to change a destination port but keep the ip the same.

    - by Scott Chamberlain
    I am playing around with transparent proxies, The current way I am doing things is the program makes a request to a computer on port 80, I use iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy so I want to do something like iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated.

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  • How to grant secure access to an untrusted developer to an exisiting virtual host?

    - by Margaret Thorpe
    Our security policy does not permit ftpd on our servers. Our trusted developers use ftps to access our webservers and they have full access to the server. How do we grant limited access to a single untrusted developer for an existing virtual host. Ive configured rssh to only allow sftp to our untrusted developer, but we dont want him browsing around our other sites. I've investigated chroot, but it seems overly complex and more for restricting access to their home folders. I want to limit access to /srv/www/vhostx/ and below. Whats the best solution?

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  • How to associate a domain name and IP address?

    - by StackedCrooked
    The situation is as follows: I am renting a dedicated server using SliceHost. On this server I have installed a small HTTPServer. I can verify that it works by nativating directly to its IP address (example). I have also purchased a domain name from gandi.net and would like to link it with to my server. However, I'm having much trouble finding clear instructions on how to create this link. After a few hours of reading documentation and trying out things I ended up the following configuration. on the DNS registrar I have specified the following settings: on the Slicehost server I specified these "records": But it doesn't seem to work. I end up on this page telling me the domain name is not available. Does anyone have an idea what I am doing wrong?

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  • OEM to Virtual Machine for Diaster Recovery / Business Continuity.

    - by James
    Hello, We are trying to deploy a Business Continuity Appliance (Zenith BDR) for a customer and one of the features is the ability to bring up the failed server in a virtual machine on the appliance. Great feature. However, the customer has OEM version of Server 2003 on that server and it comes up requiring immediate re-activation since it is now on different hardware. We would be happy with a 2-3 day grace period which is what we expected, but this isn't happening. What are the solutions without having to purchase another VLK copy of Server 2008 and re-installing the server with that license just so we can set this thing up.

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