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  • Minecraft server hosting hardware specifications [on hold]

    - by Andrew Wright
    I am planning on purchasing a server to rent off Minecraft game servers, largely to friends. I am planning on purchasing a 128GB RAM server to save on colocation costs (as I am likely to need more than 32GB and would have to rent 2U of space...) I am hoping for some advice about the processing power needed to deal with this level of RAM. The servers will be run in a shared environment on linux in a VM to make backups easier. The server I have in mind is dual CPU. I have been considering at the low end dual Xeon E5-2609V2 Quad-Core 2.5Ghz, and at the high end dual Xeon E5-2650V2 Eight-Core 2.6Ghz. The difference between these is 6.4 GT/s and 8 GT/s and £3000 for the lower spec server, £4300 for the higher spec. I was hoping I could get advice about whether it is worth paying for the extra/higher speed processor or if I would be wasting my money? Thank you for any help - I appreciate that this is not directly related to professional system administration.

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  • How to open a VirtualBox (.VDI) Virtual Machine

    - by [email protected]
     How to open a .VDI Virtual MachineSometimes someone share with us one Virtual machine with extension .VDI, after that we can wonder how and what with?Well the answer is... It is a VirtualBox - Virtual Machine. If you have not downloaded it you can do this easily, just follow this post.http://listeningoracle.blogspot.com/2010/04/que-es-virtualbox.htmlorhttp://oracleoforacle.wordpress.com/2010/04/14/ques-es-virtualbox/Ok, Now with VirtualBox Installed open it and proceed with the following:1. Open the Virtual File Manager. 2. Click on Actions ? Add and select the .VDI fileClick "Ok"3.  A new Virtual machine will be displayed, (in this Case, an OEL5 32GB Virtual Machine is available.)4. This step is important. Once you have open the settings, under General option click the advanced settings. Here you must change the default directory to save your Snapshots; my recommendation set it to the same directory where the .Vdi file is. Otherwise you can have the same Virtual Machine and its snapshots in different paths.5. Now Click on System, and proceed to assign the correct memory and define the processors for the Virtual machine. Note: Enable  "Enable IO APIC" if you are planning to assign more than one CPU to the Virtual Machine.6. Associated the storage disk to the Virtual machineThe disk must be selected as IDE Primary Master. 7. Well you can verify the other options, but with these changes you will be able to start the VM. Note: Sometime the VM owner may share some instructions, if so follow his instructions.8. Click Ok and Push Start Button, and enjoy your Virtual Machine

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  • How to open a VirtualBox (.VDI) Virtual Machine

    - by [email protected]
     How to open a .VDI Virtual MachineSometimes someone share with us one Virtual machine with extension .VDI, after that we can wonder how and what with?Well the answer is... It is a VirtualBox - Virtual Machine. If you have not downloaded it you can do this easily, just follow this post.http://listeningoracle.blogspot.com/2010/04/que-es-virtualbox.htmlorhttp://oracleoforacle.wordpress.com/2010/04/14/ques-es-virtualbox/Ok, Now with VirtualBox Installed open it and proceed with the following:1. Open the Virtual File Manager. 2. Click on Actions ? Add and select the .VDI fileClick "Ok"3.  A new Virtual machine will be displayed, (in this Case, an OEL5 32GB Virtual Machine is available.)4. This step is important. Once you have open the settings, under General option click the advanced settings. Here you must change the default directory to save your Snapshots; my recommendation set it to the same directory where the .Vdi file is. Otherwise you can have the same Virtual Machine and its snapshots in different paths.5. Now Click on System, and proceed to assign the correct memory and define the processors for the Virtual machine. Note: Enable  "Enable IO APIC" if you are planning to assign more than one CPU to the Virtual Machine.6. Associated the storage disk to the Virtual machineThe disk must be selected as IDE Primary Master. 7. Well you can verify the other options, but with these changes you will be able to start the VM. Note: Sometime the VM owner may share some instructions, if so follow his instructions.8. Click Ok and Push Start Button, and enjoy your Virtual Machine

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  • Optimal Configuration for five 300 GB 15K SAS Drives

    - by Bob
    I recently acquired an HP Z800 workstation that has five 300 GB 15K SAS Drives. This system will be dedicated to running multiple virtual machines under VMware Workstation (Note: I'm not using ESXi because I do plan to use the system for other purposes.). For the host OS, I plan to install RHEL 5. My number one concern is guest performance. For example, should I create a RAID 10 array for the OS and virtual machine storage with four of the drives and reserve the 5th? Or, is there a solution that will provide better performance?

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  • Get Hardware Information for HWs that is not installed

    - by Isaac
    I am pretty sure how to retrieve hardware information with WMI classes. but WMIs have a big limitation: They Just can get information for installed hardwares. I need to retrieve information about CPU (model,speed,etc..),Video Card, Sound Card, USB Ports, etc. I found a really good software (HWiNFO) that can do this even the drivers for hardware parts is not installed. It seems that HWiNFO uses a internal database to give a name for each hardware part. So is there any free library/DLL/component that can do this in Windows XP or higher Note: Although HWiNFO SDK seems good, it's not free. So it doesn't exist! ;) I need a free library.

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  • ClearType setting ignored in Windows Virtual PC with Windows XP Pro

    - by Yadyn
    I have a VM set up through Windows Virtual PC for Windows XP Pro and I have been completely unable to get ClearType to work. I have turned it on in the Display - Appearance - Effects dialog but it seems like it completely ignores this. All text is still without any anti-aliasing. Even setting it to normal smoothing doesn't work. If I disable Integration Features, it seems to work, but then I lose a lot of nice features. What's weirder, is that the Windows XP Mode installed with Windows Virtual PC (this is separate from my XP Pro VM) works with both ClearType and Integration Features just fine. I turned it on the same way and it works like a charm, no problems. I'm running Windows 7 Professional 64-bit as the host OS and have the latest (to my knowledge) Windows Virtual PC installed. The only funny business I can think of is that I've enabled 24-bit color via the Group Policy setting inside each XP virtual machine (both Pro and the stripped down XP mode copy). This is a fairly well-known trick documented all over the web, but here's a typical post about it.

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  • Tips on setting up a virtual lab for self-learning networking topics

    - by Harry
    I'm trying to self-learn the following topics on Linux (preferably Fedora): Network programming (using sockets API), especially across proxies and firewalls Proxies (of various kinds like transparent, http, socks...), Firewalls (iptables) and 'basic' Linux security SNAT, DNAT Network admininstration power tools: nc, socat (with all its options), ssh, openssl, etc etc. Now, I know that, ideally, it would be best if I had 'enough' number of physical nodes and physical network equipment (routers, switches, etc) for this self-learning exercise. But, obviously, don't have the budget or the physical space, nor want to be wasteful -- especially, when things could perhaps be simulated/emulated in a Linux environment. I have got one personal workstation, which is a single-homed Fedora desktop with 4GB memory, 200+ GB disk, and a 4-core CPU. I may be able to get 3 to 4 additional low-end Fedora workstations. But all of these -- including mine -- will always remain strictly behind our corporate firewall :-( Now, I know I could use VirtualBox-based virtual nodes, but don't know if there are any better alternatives disk- and memory- footprint-wise. Would you be able to give me some tips or suggestions on how to get started setting up this little budget- and space-constrained 'virtual lab' of mine? For example, how would I create virtual routers? Has someone attempted this sort of thing before: namely, creating a virtual network lab behind a corporate firewall for learning/development/testing purposes? I hope my question is not vague or too open-ended. Basically, right now, I don't know how to best leverage the Linux environment and the various 'goodies' it comes with, and buying physical devices only when it is absolutely necessary.

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  • Creating an Apache Virtual Directory, but updating Active Directory DNS

    - by SnoConeGod
    Hello all, I'm just getting started with using the Zend Framework and am following a recommended procedure where I am supposed to create an Apache Virtual Directory for the public-facing portion of a new Zend project. I don't THINK I had any issues creating the Virtual Directory, but my knowledge of the required DNS changes is rather lacking. The dev server I'm using is on a Microsoft Windows Active Directory domain, so I've added A records for both the server name and the subdomain. Still, trying to browse to the site from a Windows 7 PC isn't working properly. What am I missing? What's the proper set of steps for getting an Apache-served subdomain to appear properly in a peer computer's web browser? Details below: server: Debian command-line only, freshly installed today with Zend Server CE LAMP stack server name: ZENDEV subdomain: SQUARE.ZENDEV AD Domain functional level: 2008 mixed (run by a mishmash of 03 and 08 servers) attempting to visit the sites: http://square.zendev and http://square.zendev.domain.local (name of domain redacted, but using the local (not com) suffix) Apache Virtual Directory added to httpd.conf: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot "/var/www/square/public" ServerName square.localhost </VirtualHost> Is this only a problem with DNS? Or with DNS and my Virtual Directory? Thanks! John

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  • Multimaster Keepalived Configuration (Virtual IP with Load Balancing)

    - by Rad Akefirad
    Here are requirements: 1. High Availability 2. Load Balancing First configuration 1. Two linux servers have been configured with one static IP for each: 10.17.243.11, 10.17.243.12 2. Keepalived has been installed and configured with one VRRP instance to provide one virtual IP (10.17.243.10 as VIP, 10.17.243.11 as master and 10.17.243.12 as backup). 3. Everything works fine. The VIP is assigned to the master server (10.17.243.11) as long as it is up and running. As soon as it goes down, the VIP will be assigned to the backup server (10.17.243.12). 4. The problem here is all communication goes to the master server. Second configuration 1. I found active-active configuration for Keepalived which is possible by defining more than one VRRP instance. So that both server have two IPs (real 10.17.243.11 and virtual 10.17.243.10 for server #1 and real 10.17.243.12 and virtual 10.17.243.20 for server #2. 2. Everything works fine. we have two VIPs which are accessible (HA). But all communication coming to each IP still goes to one single machine (either server #1 or #2 depending on the IP). However I found some tricks on the DNS to overcome this limitation. But it's not acceptable in our case. Question: Is there any way to have one virtual IP which is assigned to both servers? By that I mean both servers are handling some part of workload (like the thing we do in web server load balancing)? By using either keepalived or some other tools? Thanks in advance.

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  • NAT via iptables and virtual interface

    - by Alex
    I'm trying to implement the following scenario: One VM-host, multiple guest VMs, each one gets its own IP-address (and domain). Our server has only one physical interface, so the intended use is to add virtual interfaces on eth0. To complicate our situation the provider uses port-security on their switches, so I can't run the guest interfaces in bridged mode, because then the switch detects a "spoofed" MAC-address and kills the interface (permanently, forcing me to call the support, which I'm sure will get them a little bit angry the third time ;) ). My first guess was to use iptables and NAT to forward all packages from one virtual interface to another one, but iptables doesn't seem to like virtual interfaces (at least I can't get it to work properly). So my second guess is to use the source IP of the packages to the public interface. Let's assume libvirt creates a virbr0-network with 192.168.100.0/24 and the guest uses 192.168.100.2 as IP-address. This is what I tried to use: iptables -t nat -I PREROUTING --src public_ip_on_eth0:0 -p tcp --dport 80 -j DNAT --to-destination 192.168.100.2:80 That doesn't give me the intended results either (accessing the server times out). Is there a way to do what I'm trying to do, or even to route all traffic to a certain IP on a virtual interface to the VM's device?

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  • Crash Report in Ubuntu... hardware problem?

    - by Andrew
    Got this on my machine. I was just browsing the web on Chrome and my computer froze. I recently just built this machine. I have a feeling it is a hardware problem... Possibly one of my parts arrived broken in some way.... Starting anac(h)ronistic cron Stopping anac(h)ronistic cron Stopping cold plug devices Stopping log initial device creation Starting enable remaining boot-time encrypted block devices Starting configure network device security Starting configure virtual network devices Starting save udev log and update rules Stopping configure virtual network devices Stopping save udev log and update rules Checking battery state... Stopping System V runlevel compatibility Stopping enable remaining boot-time encrypted block devices Stopping Mount filesystems on boot 91.573384] BUG: unable to handle kernel NULL pointer dereference at (null) 91.573437] IP: [<ffffffff81313514>] strcmp+0x14/0x30 91.573470] PGD 1f7822067 PUD 1ed7a6067 PMD 0 91.573498] Oops: 0000 [#1] SMP 91.573519] CPU 3 91.573531] Modules linked in: dm_crypt bnep snd_hda_codec_realtek rfcomm bluetooth parport_pc ppdev arc4 fglrx(P) rt2800usb rt2800lib crc_ccitt rt2x00usb rt2x00lib mac0021 cfg80211 psmouse snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer send_seq_device snd joydev mac_hid mei(C) soundcore serio_raw snd_page_alloc lp parport ses enclosure usbhid hid i915 drm_kms_helper drm i2c_algo_bit mxm_umi tg_video wmi usb_storage 91.573826] 91.573837] Pid: 2297, comm: update-notifier Tainted: P C O 3.2.0-29-generic #46-Ubuntu To Be Filled By O.E.M. To Be Filled By O.E.M./Z77 Extreme4 91.573912] RIP: 0010:[<ffffffff81313514>] [<ffffffff81313514>] strcmp+0x14/0x30 91.573954] RSP: 0018:ffff8801f83f5bb8 EFLAGS: 00010246 91.573982] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 91.574019] RDX: 0000000000000069 RSI: 0000000000000000 RDI: ffff88021adb26f8 91.574056] RBP: ffff8801f83f5bb8 R08: ffff88022f2d6e80 R09: 0000000000000000 91.574093] R10: ffff88021e7dbf00 R11: 0000000000000003 R12: ffff88021c10eb40 91.574130] R13: 0000000000000000 R14: ffff88021adb26f8 R15: ffff8801f83f5d40 91.574168] FS: 00007f958cf53940(0000) GS:ffff88022f2c0000(0000) kn1GS:0000000000000000 91.574210] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 91.574240] CR2: 0000000000000000 CR3: 000000021f6d7000 CR4: 00000000000406e0 91.574277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 91.574314] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000000 91.574351] Process update-notifier (pid: 2297, threadinfo ffff801f83f4000, task ffff880208fe2e00) 91.574397] Stack: 91.574409] ffff8801f83f5be8 ffffffff811ed509 ffff88021adb26c0 ffff88021b8b7020 91.574453] ffff88021b461c60 fffffffffffffffe ffff8801f83f5c18 ffffffff811ed61f 91.574496] ffff88021adb26c0 ffff88021b8b7020 ffff8801f83f5dc8 0000000000000001 91.574539] Call Trace: 91.574558] [<ffffffff811ed509] sysfs_find_dirent+0x59/0x110 91.574591] [<ffffffff811ed61f] sysfs_lookup+0x5f/0x110 91.574621] [<ffffffff81182745] d_alloc_and_lookup+0x45/0x90 91.574654] [<ffffffff8118fe65] ? d_lookup+0x35/0x60 91.574683] [<ffffffff811848d2] do_lookup+0x202/0x310 91.574712] [<ffffffff8118660c] path_lookupat+0x11c/0x750 91.574744] [<ffffffff81318db7] ? __strncpy_from_user+0x27/0x60 91.574778] [<ffffffff81186c71] do_path_lookup+0x31/0xc0 91.574809] [<ffffffff81187779] user_path_at_empty+0x59/0xa0 91.574842] [<ffffffff81187822] ? do_filp_open+0x42/0xa0 91.574872] [<ffffffff811877d1] user_path_at+0x11/0x20 91.574902] [<ffffffff8117c80a] vfs_fstatat+0x3a/0x70 91.574933] [<ffffffff81161cff] ? kmem_cache_free+0x2f/0x110 91.574965] [<ffffffff8117c85e] vfs_lstat+-x31/0x70 91.574993] [<ffffffff8117c9fa] sys_newlstat+0x1a/0x40 91.575022] [<ffffffff81176ee1] ? do_sys_open+0x171/0x220 91.575053] [<ffffffff8117cb1a] ? sys_readlinkat+0x7a/0xb0 91.575086] [<ffffffff81661ec2] system_call_fastpath+0x16/0x1b 91.575118] Code: 83 c1 01 40 84 ff 75 ef 5d c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 00 55 31 c0 48 89 e5 66 2e 0f 1f 84 00 00 00 00 00 0f b6 14 07 <3a> 14 06 75 0f 48 83 c0 01 84 d2 75 ef 31 c0 5d c3 0f 1f 00 19 91.577243] RIP [<ffffffff81313514>] strcmp+0x14/0x30 91.579314] RSP <ffff8801f83f5bb8> 91.581385] CR2: 0000000000000000

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  • Is this possible to re-duplicate the hardware signal on Linux?

    - by Ted Wong
    Since that every things is a file on the UNIX system. If I have a hardware, for example, a mouse, move from left corner to right corner, it should produce some kinds of file to communicate with the system. So, if my assumption is correct, is this possible to do following things: Capture the raw data, which is about moving mouse cursor from left corner to right corner? Reduplicate the raw data, using a program, same producing speed, and data, in order to "redo" moving mouse cursor from left corner to right corner

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  • How do I toggle the wifi hardware switch for a Dell XPS 17 L702X?

    - by Sparhawk
    Every now and then, I disable my wireless via the menu icon in Ubuntu. Then, when I try to enable the wifi, it tells me that "wireless is disabled" or "wireless is disabled by hardware switch". There is a red icon on the F2 key that looks like a wireless icon, and in Windows, pressing the (red) Fn key and F2 toggles the wifi. This does not work in Ubuntu, leaving me no clear way to turn wifi back on. How can I restart wifi in Ubuntu?

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  • Microphone not working in Windows Virtual PC (on Windows 7)

    - by Clay Nichols
    I"m using Windows Virtual PC on Windows 7 (host) running Windows XP (as the Guest O/S) I'm trying to get the Microphone working. When I Enable Integration Features: Microphone does not work When I run the Sound Recorder, the record button is disabled. If I look at Sound settings, there are no options for the Mic (it's all disabled "grayed out"). Speakers work Copy & Paste works When I Disable Integration Features: Microphone and speakers work Copy and Paste does not (as expected) Drag'n Drop copying does not work in either situation. What I've Tried Verified that the Windows XP Mode Virtual PC guest also has the same symptoms (Mic doesn't work) and audio out (speakers) do work. I"m going to try (but have little hope) to: -Uninstall and Reinstall the Integration addin for Virtual PC

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  • Windows activation on a Virtual Machine (Physical->VM)

    - by Daisetsu
    I backed up a number of laptops to virtual machines before they are to be re-purposed, in case I need the data at some later time. While the Physical to VM processes worked fine I am encountering issues on some of the VMs. When I boot them I get an error message saying I MUST activate windows in order to login. This is expected because the hardware changed (from physical hardware to virtualized hardware). I click the OK button and expect to be prompted with ways to activate, windows sits there for quite a while then tells me that "Windows has already been activated". I click OK at that message and get take back to the beginning where I am asked to activate Windows. I have done some fairly intensive googling but haven't been able to find a real solution. EDIT: The laptops with the issues are 2 Sony Vaios, I believe that they have the OEM version of the OS originally installed by the factory.

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  • Problem with Windows activation on a VM (Virtual machine)

    - by Daisetsu
    I backed up a number of laptops to virtual machines before they are to be re-purposed, in case I need the data at some later time. While the Physical to VM processes worked fine I am encountering issues on some of the VMs. When I boot them I get an error message saying I MUST activate windows in order to login. This is expected because the hardware changed (from physical hardware to virtualized hardware). I click the OK button and expect to be prompted with ways to activate, windows sits there for quite a while then tells me that "Windows has already been activated". I click OK at that message and get take back to the beginning where I am asked to activate Windows. I have done some fairly intensive googling but haven't been able to find a real solution. EDIT: The laptops with the issues are 2 Sony Vaios, I believe that they have the OEM version of the OS originally installed by the factory.

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  • How to increase virtual hard drive space

    - by Chris
    I have a Microsoft Virutal PC hard drive (.vhd format) that's maxed out it's 16 gig hard drive space. What would be the best way to increase this diskspace? Booting into the machine (windows xp professional) and using the disk management snap in, I can see that the virtual drive has approximately 40 more unused gigs of space. Trying to use diskpart, I find out that Windows XP can't extend the boot partition. So I'm at an empass, any suggestions on how to increase the partion or to increase the actual virtual hard drive would be great. Note: The virtual hard drive is running on Windows 7 using XP mode.

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  • linux ftp server with virtual users

    - by kjertil
    i know there are already similar questions for this matter but the answers doesn't really make much sense to anyone who is not really technically comfortable in Linux. I've already tried articles like these for example: http://howto.gumph.org/content/setup-virtual-users-and-directories-in-vsftpd/ with the result of accidently breaking the whole system. The problem is that, while there are several technical possibilities to set up virtual users with a FTP server, it is not as easy as managing for instance a Filezilla server on Windows. I've seen some Web based GUI's but most of them seems to be out of date. The different flavours of Linux and the large amount of different popular FTP servers also seems to make the matter more complicated. I guess my question is, is there a way, to set up virtual FTP users on Linux without the hastle of having to manually edit PAM, MYSQL and config files?

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  • Duplicate Name Exists error from virtual PC with NAT network configuration

    - by Phred
    Whenever I change the network configuration to NAT for a virtual machine running under Virtual PC 2007, I get "A duplicate name exists on the network." error. There is no other machine on my network with this name and running the VM in any other network configuration doesn't cause this error. This seems to be a common problem with Virtual PC 2007 based on a google search but no-one seems to have a solution to it. So far, I've discovered that turning off NETBIOS over TCP causes the problem to go away but I need to join this VM to a domain and you can't do that if NETBIOS over TCP is turned off.

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  • Cannot get Virtual PC to install on my machine

    - by Brandon
    I'm not sure what I'm doing wrong. I ran the tool to check that hardware virtualization is enabled, and it is (i7-2600). I ran the proper version of the Virtual PC download (Windows 7 Professional x64) and I can see the Windows Virtual PC (KB958559) update in my installed updates list. The .msu file runs fine without errors, but even after multiple reboots I can't actually find a trace of Virtual PC anywhere. There is nothing in program files, the start menu, or system32. Am I missing a step?

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  • HFT strategy coding on hardware

    - by bsobaid
    Hardware accelaration and embedded programming has mostly been used so far to parse datafeed and/or to route orders to exchange. Have there been attempts to write simpler HFT strategies such as equity market-making in hardware? Have they been successful? Which companies are doing this and what kind of programming model is used?

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