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• How can I install CentOS without a keyboard, mouse, or monitor?

  - by user1032531

  I will be buying a new computer which will be used as a CentOS server. I will put it on my home LAN, and once it is set up, will access it only through SSH. I don't want to spend a lot of money (maybe $500), and I don't want to buy another monitor or keyboard just to through them away after the server is setup. My question is how do I access the computer without a keyboard and monitor when I install the operating system? For media, I can use either the DVD or an ISO on the USB, so am good there. But how do I see what I am doing and enter commands without a monitor or keyboard? I have a Window 7 laptop, an XP laptop, and a CentOS laptop. Can I use one of my laptops to act as the MMI (Man Machine Interface)? If not, what is the easiest and least expensive option? Thank you

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• How to install virtio balloon driver in Windows Server 2008 Std x64

  - by javano

  I am trying to run the install command in the INF file that comes on the virtio drivers ISO, after having downloaded devcon.exe from Microsoft's website. I am getting the following error and I don't know how to progress; C:\Users\Administrator\Desktop\ADM64>devcon install BALLOON.inf PCI\VEN_1AF4&DEV_1002&SUBSYS_00051AF4&REV_00 devcon.exe failed. 'DEV_1002' is not recognized as an internal or external command, operable program or batch file. 'SUBSYS_00051AF4' is not recognized as an internal or external command, operable program or batch file. 'REV_00' is not recognized as an internal or external command, operable program or batch file. Thank you.

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• Thin virtual host

  - by Adam Ryczkowski

  My work setup relies on old Windows XP. Now, when Windows XP isn't supported by new hardware, it's getting harder and harder to buy a notebook on which Windows XP can run natively with all essential hardware (wireless cards, graphics, sound etc). Since I don't expect my personal setup to turn away from Windows XP any time soon, I'm investigating the following trick: why not buy any decent hardware which Linux can fully utilize, and use it as a virtual host for a guest session with e.g. Windows XP. I like using hibernation, so I prefer this Linux to be as thin as possible, only enough to support VirtualBox, KVM or any other virtualization software. Question: Are there any "standard" ways to do this, like Linux distributions aimed specifically on being light virtualization host?

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• Thin virtual host [migrated]

  - by Adam Ryczkowski

  My work setup relies on old Windows XP. Now, when Windows XP isn't supported by new hardware, it's getting harder and harder to buy a notebook on which Windows XP can run natively with all essential hardware (wireless cards, graphics, sound etc). Since I don't expect my personal setup to turn away from Windows XP any time soon, I'm investigating the following trick: why not buy any decent hardware which Linux can fully utilize, and use it as a virtual host for a guest session with e.g. Windows XP. I like using hibernation, so I prefer this Linux to be as thin as possible, only enough to support VirtualBox, KVM or any other virtualization software. Question: Are there any "standard" ways to do this, like Linux distributions aimed specifically on being light virtualization host?

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• Share Keyboard/Mouse between PC (windows?) and Android

  - by kashiko

  Has anyone come across software that can do this successfully/reliably? I would like to set up my Nexus 7 tablet on a stand under my monitor and use it with the mouse/KB hooked up to my desktop so I can continue to use it while using my desktop without having to pick it up. I was able to find one application which claims to do this (PC Loves Android), but reviews on the Google Play store do not seem to favor it.

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• Xen 4.2 on CentOs 6.3 : can't compile a libvirt 0.9.10 xen-activated?

  - by Frederic

  I followed that tutorial for Xen 4.2 on CentOs 6.3. http://www.howtoforge.com/virtualization-with-xen-on-centos-6.3-x86_64-paravirtualization-and-hardware-virtualization When building a new libvirt package with rpmbuild -bb libvirt.spec I get that error : CC libvirt_driver_libxl_la-libxl_conf.lo In file included from libxl/libxl_conf.c:43: libxl/libxl_conf.h:61: error: field 'ctx' has incomplete type libxl/libxl_conf.h:80: error: field 'ctx' has incomplete type libxl/libxl_conf.h:81: error: expected specifier-qualifier-list before 'libxl_waiter' libxl/libxl_conf.c: In function 'libxlMakeDomCreateInfo': libxl/libxl_conf.c:365: warning: implicit declaration of function 'libxl_init_create_info' [-Wimplicit-function-declaration] libxl/libxl_conf.c:365: warning: nested extern declaration of 'libxl_init_create_info' [-Wnested-externs] libxl/libxl_conf.c:367: error: 'libxl_domain_create_info' has no member named 'hvm' libxl/libxl_conf.c:383: warning: implicit declaration of function 'libxl_domain_create_info_destroy' [-Wimplicit-function-declaration] libxl/libxl_conf.c:383: warning: nested extern declaration of 'libxl_domain_create_info_destroy' [-Wnested-externs] libxl/libxl_conf.c: In function 'libxlMakeDomBuildInfo': libxl/libxl_conf.c:406: warning: implicit declaration of function 'libxl_init_build_info' [-Wimplicit-function-declaration] libxl/libxl_conf.c:406: warning: nested extern declaration of 'libxl_init_build_info' [-Wnested-externs] libxl/libxl_conf.c:408: error: 'libxl_domain_build_info' has no member named 'hvm' [...] Do you know what I need to install or change to pass that step?

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• Web-Based Virtual Machine Manager

  - by Pete Redhead

  I am looking for a web-based virtual machine manager, which will work on our Ubuntu server. Ideally, I need something that our team can use to create a VM, test builds and packaging and then either restore to the original state or delete. libvirt has an API, but I can't find any web apps using it. Thanks

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• How do I extend the virsh/qemu/libvirt Timeout?

  - by Nick

  There's a known issue with starting virtual machines with large hard drive images. Apparently, the time-out is 3 seconds, but in reality, it can take up to 15 seconds for a machine to start. I've read several bug reports, and people confirming it's a time-out problem, but I have yet to see a solution. Is there an option I can pass, like: virsh start MyMachine --ignore-timeout Or a config file that needs changed? Thanks!

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• Bridge and OpenVPN with shorewall

  - by Javier Martinez

  I have this scenario and everything it's working OK, but I want to configure my Shorewall and I can't do it. My interfaces are: br0 (bridge of eth0) tun0 (OpenVPN) vnet* (each one of bridged interfaces with public IP's) Public Main IP: 188.165.X.Y OpenVPN IP's: 172.28.0.x Bridge: public ip's So, I have the next configuration for shorewall: /etc/shorewall/zones #ZONE TYPE OPTIONS IN OUT # OPTIONS OPTIONS fw firewall inet ipv4 road ipv4 /etc/shorewall/interfaces #ZONE INTERFACE BROADCAST OPTIONS inet br0 detect routeback road tun+ detect routeback /etc/shorewall/policy #SOURCE DEST POLICY LOG LIMIT: CONNLIMIT: # LEVEL BURST MASK $FW all ACCEPT inet $FW DROP info road all DROP inet road DROP /etc/shorewall/tunnels #TYPE ZONE GATEWAY GATEWAY # ZONE openvpnserver:1194 inet 0.0.0.0/0 The problem is that even with shorewall running I am able to ping or connect to the virtual machines behind the bridge

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• How do I prevent libvirt from adding iptables rules for guest NAT networks?

  - by Jack Douglas

  Similar to this old request on BugZilla for Fedora 8, I'm hoping something has changed since then or someone knows another way. I want to manage the iptables rules by hand—the one-size-fits-all automatic rules don't suit me at all. These rules seem to be added and removed when a network is started and destroyed. Is there a way of either preventing these rules being added at all or hooking a script into the network start that restores the default rules afterwards. For now, I'm using a very crude method with cron, but I hope there is a better way: * * * * * root iptables-restore < /etc/sysconfig/iptables

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• How should I use LVM with Ganeti?

  - by javano

  I am building a small Ganeti cluster on some low end hardware (I only have the resources given sadly). I am confused as to the use of LVMs with DRBD. I have two instances and three nodes. What I want is instance1 replicated between node 1 & 2, and instance2 replicated between nodes 3 & 2 (so node2 is doing nothing, except waiting for either node1 or 3 to fail, is it is the secondary node for both instances). This is because node2 is a lower hardware spec than 1 and 3, so I just want it as an hot-spare. How can I achieve this? I don't want instance1 being replicated to node3 for example, nor instance2 replicated to node1. Nodes 1 & 2 have /dev/sda5 which is 150GBs (for example). Nodes 2 & 3 have /dev/sda6 which is also 75GBs (for example). Using just nodes 1 & 2, after looking at the Ganeti docs I would; vgcreate my-vg Next I would create the cluster via gnt-cluster VG = "my-vg". It is here I believe that I am missing some knowledge. I believe that what I need to do is create the same Logical Volume on nodes 1 & 2 in Volume Group "my-vg", that solely consists of /dev/sda5 and call it "lv1". Then create an Logical Volume on nodes 2 & 3 the solely consists of /dev/sda6 in "my-vg" that is called "lv2". When creating instance1 I would then use "-vg=lv1 -n node1:node2", and when creating instance2 I would use "-vg=lv2 -n node3:node2". I breifly had a go at this today and I'm dubious if this will be possible. When trying to create instance2, "lv2" wont exist on node1 (the cluster master) so I don't believe it will allow the instance creation. Could I create a 1kb parition (/dev/sda6) on node1 and put it into a LV called "lv2" or is that too flakey? Is this set up possible? Thank you.

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• Determine Server specs for a Rails with MySQL database (on AWS)

  - by Rogier

  I developed a intranet applications with Rails (3.2) for one of my customers. There will be around 30-40 employees working with it. Backend is MySQL (5). What would be the best way to determine the servers specs needed? Given: max. load will be roughly 2400 (40*60) HTTP requests (mixed GET / POST) per hour. 15% of these calls are JSON calls (iOS) avg request will make between 5-10 database calls 500-800 SQL INSERTS per day webpages are fairly simple (no images, just text) avg webpage is 15 request (css/js/etc) and total size is 35-45 KB More specific, since they need access from multiple geographical locations, we are thinking of running a bitnami Ruby stack in the AWS cloud (uptime is important). Any thoughts on a AWS Instance (small/medium) and Utilization (light/medium/heavy) ? Thanks!

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• Configure iptables with a bridge and static IPs

  - by Andrew Koester

  I have my server set up with several public IP addresses, with a network configuration as follows (with example IPs): eth0 \- br0 - 1.1.1.2 |- [VM 1's eth0] | |- 1.1.1.3 | \- 1.1.1.4 \- [VM 2's eth0] \- 1.1.1.5 My question is, how do I set up iptables with different rules for the actual physical server as well as the VMs? I don't mind having the VMs doing their own iptables, but I'd like br0 to have a different set of rules. Right now I can only let everything through, which is not the desired behavior (as br0 is exposed). Thanks!

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• Allowing outbound traffic with APF/iptables for OpenVZ container

  - by David

  I have apf installed on a OpenVZ container (proxmox 2.1). The config is pretty much vanilla and things are working. My external services like ssh and http are working. My problem is that all outbound traffic on http/https is blocked. How do I allow all outbound traffic for http/https. If I change EGF to 1 like this, all inbound and outbound traffic gets blocked EGF="1" EG_TCP_CPORTS="21,25,80,443,43,53" EG_UDP_CPORTS="20,21,53" EG_ICMP_TYPES="all" I opened a single outbound rule with the following # /usr/local/sbin/apf -a downloads.wordpress.org How do I allow all outbound traffic on http/https without blocking all traffic? Why would I allow all inbound ssh/http traffic and block all outbound traffic?

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• How do you synchronise huge sparse files (VM disk images) between machines?

  - by chrisdew

  Is there a command, such as rsync, which can synchronise huge, sparse, files from one linux server to another? It is very important that the destination file remains sparse. It may be longer (but not bigger) than the drive which contains it. Only changed blocks should be sent across the wire. I have tried rsync, but got no joy. groups.google.com/group/mailing.unix.rsync/browse_thread/thread/94f39271980513d3 If I write a programme to do this, am I just reinventing the wheel? http://www.finalcog.com/synchronise-block-devices Thanks, Chris.

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• How to switch off the monitor when mouse reaches the edge of the screen?

  - by evgeny9

  I have 2 computers at home (Windows XP and Windows 7), but one monitor for both of them. They are connected to this monitor using different interfaces: DVI and VGA. I'm also using one keyboard and one mouse to control both PCs with the help of Synergy or Input Director. But I still need to manually switch between monitor interfaces. I wonder, if there's some way (software) that will switch this interfaces (turn off the monitor), when reach the edge of the screen with the mouse. Until now I found several answers, which help to avoid pressing hardware buttons, but still can not do the job automatically based on mouse pointer coordinates. Thank you.

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• Playing games over RDP and utilizing other res of powerfull PC... [closed]

  - by Alex

  Possible Duplicate: Is it possible to run games over remote desktop? Hey guys, I have the one question..that may be not usual but very interesting.. Well, I have laptop and some powerfull PC, now I want to utilize ALL energy of the powerfull PC on my notebook.. for example, run games like F.E.A.R on powefull PC and next play it over the Remote Desktop on my laptop.. both PC may be connected lan < lan, or thru Wi-Fi, or FireWare, or (?) any other way that does not matter.. Google told me that it won't work over RDP due to protocol lacks and there should be many bump on the road on that way.. but, maybe , you guys will give me the right point ? Let's formalzie.. we'd like to utilize all resources of one PC on another PC via network, how we should do that ? Any ideas?

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• How can I turn off display resolution auto-detection in Windows Vista?

  - by 6502

  At work I've 4 different computers connected using a keyboard/video/mouse switch. Quite often when I switch to windows vista the resolution is totally wrong and I need to get the screen properties dialog, change to another wrong resolution (because the fun part is that the apparently current resolution listed in the dialog is the correct one) then re-switch to the correct resolution. I would really like to just shut that broken resolution autodetection code off. Is there a way to disable screen resolution autodetection in Windows Vista?

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• Storage sizing for virtual machines

  - by njo

  I am currently doing research to determine the consolidation ratio my company could expect should we start using a virtualization platform. I find myself continually running into a dead end when researching how to translate observed performance (weeks of perfmon data) to hdd array requirements for a virtualization server. I am familiar with the concept of IOPs, but they seem to be an overly simplistic measurement that fails to take into account cache, write combining, etc. Is there a seminal work on storage array performance analysis that I'm missing? This seems like an area where hearsay and 'black magic' have taken over for cold, hard fact.

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• Running Hyper-V and VMWare together

  - by Shiki

  I have two virtualization software on one of my laptops which is dedicated to Windows 8 development. A VMWare for generic virtualization and the Windows 8 like Hyper-V for the WP8 SDK. Unfortunately these softwares don't like each other. Is there a way to get them play along? The exact problem is that if I install the SDK, VMWare won't even update or run. There is only one way to make them work. Switch Hyper-V on and off. Which is one restart all the time.

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• Data-Virtualization problem with SurfaceScrollViewer

  - by TWith2Sugars

  I'm in a situation where I'm using an ItemsControl with a SurfaceScrollViewer bound to an AsyncVirtualizingCollection and all of the data is being requested. I'm aware that it's due to the ItemsControl request all of the data but I'm not sure how to get around this. I've tried the AsyncVirtualizingCollection bound to a ListBox and it works fine and I'm now attempting to having it bound to a SurfaceListBox but the problem persists. Any ideas of how to overcome this? Thanks & Regards Tony

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• how to do virtualization ?

  - by Jayjitraj

  Hi, I am newbie in vc++. I have configured my system with WDK,DDK and Visual Studio 2008. I want to implement dual functionality to my wireless hardware and i am using Vista so please help me out from here. so just tell me which function should i use Thanks in advance... :)

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• Bridging Virtual Networking into Real LAN on a OpenNebula Cluster

  - by user101012

  I'm running Open Nebula with 1 Cluster Controller and 3 Nodes. I registered the nodes at the front-end controller and I can start an Ubuntu virtual machine on one of the nodes. However from my network I cannot ping the virtual machine. I am not quite sure if I have set up the virtual machine correctly. The Nodes all have a br0 interfaces which is bridged with eth0. The IP Address is in the 192.168.1.x range. The Template file I used for the vmnet is: NAME = "VM LAN" TYPE = RANGED BRIDGE = br0 # Replace br0 with the bridge interface from the cluster nodes NETWORK_ADDRESS = 192.168.1.128 # Replace with corresponding IP address NETWORK_SIZE = 126 NETMASK = 255.255.255.0 GATEWAY = 192.168.1.1 NS = 192.168.1.1 However, I cannot reach any of the virtual machines even though sunstone says that the virtual machine is running and onevm list also states that the vm is running. It might be helpful to know that we are using KVM as a hypervisor and I am not quite sure if the virbr0 interface which was automatically created when installing KVM might be a problem.

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• Home Server: cpu virtualisation, what to choose?

  - by Huygens

  I'm looking for virtualisation solutions for storage and OS for a home server. A sort of private cloud where I manage the storage space independently of the VM one. This question focus on VM (or compute instance) management and what would best suit my needs. (I have another question related to the storage management). My use cases are: A backup server: rsync and other services running. A personal cloud server: a kind of owned dropbox system, à la ownCloud. " users foreseen. A media server: streaming videos and displaying photos. Here my environement and wishes: Server: HP Proliant MicroServer with 8 GB RAM (AMD Turion dual core with AMD-V technology) OS types: only Linux (perhaps a *BSD VM in the future) Linux distributions do not matter, I'm familiar with RHEL, Fedora, Suse, Ubuntu, but any other recommandation will be fine 2-3 VMs foreseen: backup server, owncloud server and media server (optional). Those are only servers, so no graphical console needed (I don't need VirtualBox) By VM I mean a virtualised environment like KVM, Xen, etc. or a compute instance like with OpenStack storage should be "virtualised/cloudified" see my other question. VM should be able to be migrated to another server in the future if performance cannot be fullfilled anymore by the current server It does not matter if installation of such setup is complicated as long as management tools allow for easy maintenance I don't have Windows at home, so solution should be Linux friendly and would be nice to be web based. But native apps are OK too. System should be easy to enhance: by adding a new server to migate some of the VMs to it. So it's really a kind of private cloud on which I could run some Linux OS. I would prefer free (libre, as in a free speach) and open source tools. But it does not have to be free as in a free beer. So Xen, KVM, VitualBox or OpenStack? What would you recommend?

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• Best way to build / implement a corporate developer Linux distro with multiple kernels?

  - by Garen

  At work we have Linux users who understandably prefer using Ubuntu. Problem is, we also have developer tools that only work with 'officially' supported Linux distributions that use much older 2.6.18 based kernels. (And even if they worked with newer ones, the vendors could always say they won't "support" the software unless it's on one of their 'officially' supported platforms.) We could of course just tell them to use CentOS or something else 2.6.18-based, and I'm sure their response would be something like: "you can take Ubuntu from our cold, dead hands." :) Which brings to me some questions--is there any good/easy/recommended way to run something like Ubuntu as a host VM and Centos 5.x as a guest OS (with which system--Xen,KVM,VMWare, ...?), and then roll that into our own custom internal distribution that could be easily installed? KVM looks like a good high-performance option just recently included in RHEL 5.4, but if hardware support for virtualization like Intel-VT or AMD-V is necessary, then I'd guess only those folks with fairly new PCs will be able to do it. Would be very interested to hear how anyone else has addressed this kind issue. EDIT: The target audience / users of this kind of system would be developers, each one needs to run locally licensed commercial software, so building out some separate beefy central machines isn't an option unfortunately due to license restrictions. Even if that weren't the case, a couple developers could quickly eat up the resources with parallel builds. :) Ideally, I was hoping there was some step-by-step guide out there to build your own pre-built distribution that had e.g. CentOS 5.x and Ubuntu Desktop as a guest.

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