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  • Standalone server setup for compute capacity

    - by mikera
    I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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  • Booting ubuntu from usb hdd: GRUB menu not shown

    - by emanemos
    Hello, could anyone help me to boot ubuntu-9.04 from usb hard disk? This disk contains /boot primary partition. During ubuntu installation I used "Advanced" button and asked to install GRUB to the /boot partition. Later I checked whether GRUB files are really present in this partition. They are. However, I get stuck while trying to boot. The boot menu ("ubuntu generic version", "ubuntu recovery mode", etc...) is not shown. Instead I am thrown to GRUB minimal bash-like version. I feel at a loss and have no idea why I am pointed to this minimal version. Can anybody prompt me what to do?

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  • Windows Java-based apps not working

    - by DariusVE
    After updating the Java JRE to 7u25, many Java-based applications not works as usual, the I upgrade Java to 7u45, and still the apps not working. Minecraft start screen not showing, have to press TAB key to select the Run button and press ENTER to run the game. Netbeans IDE it's running, but none it's showing on the screen. Eclipse and JDownloader are working fine. I cannot run the Java Control Panel, it's only shows the Java icon at the taskbar. My System OS: Windows 7 Ultimate SP1 64Bits Java: java version "1.7.0_45" Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) Client VM (build 24.45-b08, mixed mode, sharing)

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  • Is it dangerous to add/remove a hard-drive to a Windows machine which is in stand by?

    - by Adal
    Can I add a SATA drive to a Windows 7 machine which is in standby mode? The hardware supports hot-plug. Could pulling the drive out while in standby corrupt the data on the drive (unflushed caches, ...)? Does Windows flush before standing by? How about swapping a drive with another drive of different kind (SSD - mechanical disk) and size, also while in stand-by. Could the OS when waking up believe that the old drive is still there, and write to it and thus corrupt it, since the new one has different partitions and data?

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  • Emulate a USB port as a USB flash drive?

    - by Wilco
    Does anyone know of any software that can emulate a USB flash drive through an available USB port in OS X? Perhaps some way to map a directory to a USB port that could then be connected to another device that supports reading USB storage devices? I'd love to connect my laptop to my car's USB port and access files as if it were a USB drive. I know about the target disk mode with firewire (not sure if this is also supported over USB), but I was hoping for something that doesn't require booting outside of the OS (I want to retain use of the machine). Any ideas?

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  • Outlook + Exchange 2007: it is possible to rid of local OST files?

    - by kdl
    I am looking for a solution which would allow to use a convenience of Outlook as a mail client app while at the same time have no PST or OST files on a local computer. Even in 'non-caching' mode Outlook creates an OST file where it downloads everything from the Exchange server. OWA does not create any local files (except cookies I believe) but lacks some of the nice features Outlook has. Would it be feasible to place OST files on a network share? Maybe the solution exists for some other client+server pair?

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  • How to switch a Sound Ouput Device before the Mac goes to sleep?

    - by Konzepz
    I've connected my MacBook to a set of external speakers with a USB. Now, every time the computer goes to Sleep Mode, there's an awful static sound coming from the speakers. I guess this is some bad wiring; but that's what I've got. However, I can use an idea for a script (AppleScript, bash, whatever) that will switch off the USB output sound in (System Preferences) before the computer goes to sleep, and will switch it back on (if exists) on Wake. Any ideas? Thanks!

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  • how to make SFTP work on Windows

    - by cyberkiwi
    What is the correct way to set up sshwindows for SSH key authentication? Does the user need to be created in Windows first or can a login be inserted into passwd without a Windows equivalent? I've searched on Google and have tried the tutorials and quick start guides. So far, exactly 0 have worked. None pointed out that to work in Windows 2008 R2, you need to change the properties of cygrunsrv.exe to "Windows XP SP3" compability mode to even get past the service startup "error 1067". Although it is running, no amount of configuration allowed me to log on to the SFTP server, even though I tried (from another machine): same user account added using "mkpasswd" + windows password same user account added using "mkpasswd" + public ssh key (added to /home/theuser/.ssh) On Windows 2003 R2 (a different attempt), the service would crash every time it started up. Some links I went through http://pigtail.net/LRP/printsrv/cygwin-sshd.html http://forevergeeks.com/how-to-setup-a-secure-ftp-sftp-site-with-openssh-on-windows/ http://support.moonpoint.com/os/windows/server2003/openssh-service-not-starting.html

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  • Blank screen after grub menu

    - by Tim
    I just rebooted an Ubuntu Server 10.04. After choosing boot options in the grub menu, though, it just displays a black screen with the blinking white underscore in the upper-left corner. The machine has had (hardware) trouble with networking before, but the problem remains after 10 minutes, so I don't think it's the problem now. Booting into recovery mode or using earlier kernels yields the same problem. This also happens if I boot from another hard-drive. I haven't yet tried to boot from CD as the machine lacks a CD reader. How should I diagnose the problem? Update: My boot options are: recordfail insmod ext2 set root='(hd0,1)' search --no-floppy --fs-uuid --set 567[redacted] linux /boot/vmlinuz-2.6.32-29-generic root=UUID=567[redacted] ro quiet splash initrd /boot/initrd.img-2.6.32-29-generic Update: Also, I cannot access the virtual terminals (ctrl+alt+Fn).

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  • ubuntu server in a vm, can't connect to internet

    - by jessh
    I'm attemtping to host my own development web server in a virtual box guest, Ubuntu Server. I would like this virtual machine to be accessible from not only my home network, but outside the LAN as well. As such, I've set up a static IP (so I can later forward ports to this static IP.) My virtual box settings have this vm only using one adapter -- in bridged mode. Here's what my /etc/network/interfaces looks like: iface eth0 inet static address 10.0.1.203 /*this is outside the DHCP range*/ netmask 255.255.255.0 gateway 10.0.1.1 network 10.0.1.0 broadcast 10.0.1.255 dns-nameservers: 8.8.8.8 8.8.8.4 Here's what the output of ifconfig looks like: https://dl.dropbox.com/u/2241201/locker/ubuntu.png My Host is a mac mini, running OS X 10.7. From within the guest, if I ping google.com: $ ping google.com # outputs 'ping: unknown host google.com' immediately Why am I unable to access the web?

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  • ASUS P5B Plus motherboard - no any drives found - how to restore RAID array?

    - by Moha
    We have a small server machine with an ASUS P5B Plus motherboard and 4 SATA HDDs. The HDDs were configured in a RAID10 array. Up until now, everything worked fine, but now the system doesn't recognize the drives. BIOS is set to RAID, jMicron controller is set to RAID, yet I can't see any of the drives in the BIOS setup, and jMicron BIOS tells me "no any drives found" The HDDs all spin up, I hear no clicking sounds or anything that would suggest HDD error. I did a search on this problem and replaced the SATA cables as suggested, but nothing's changed. What I have in mind is checking the CMOS battery and resetting the BIOS to use IDE mode, but I don't know if it will ruin the RAID system on the HDDs. It is not a critical server and there's only one database running on it (which I have backup of), but I don't want to setup the server from scratch if not necessary. What should I try to restore the RAID array and put the server back to working order?

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  • Why are my hardware tabs disabled for my VMWare player image?

    - by djangofan
    I just installed a Ubuntu 10.10 image on VMWare player and after I finished installing I was messing with the hardware settings and I did the following: 1. disabled the floppy device 2. changed the CDRom to "use system cdrom" 3. tried to enable the VMWare tools but it complained that the vm was in "Easy Install" mode After I fiddled with the VM now my floppy and 2 CD rom devices as well as sound card and USB settings are all disabled in the VM hardware settings. Any idea on why this occurred and how to fix it?

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  • My computer won't go into standby or hibernate

    - by Thomas B.
    Hi. I have a problem that I first noticed yesterday. Whenever I would press the half moon standby button on my keyboard, my computer would go to sleep. I also have a shortcut on my desktop configured to put my computer into hibernate. But now whenever I try to put my pc in sleep or hibernate mode, my monitor goes black for a few seconds but then comes back on at the login screen. I haven't installed or changed anything other than create a couple logical partitions in the hfs+ filesystem. (still in the process of trying to triple-boot) Any help would be great, but for now I'm going to bed. Will check back in the morning.

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  • Windows 7 Refuses To Install To A Partition

    - by PP
    I have 4 HDDs in my PC on a Gigabyte EP45-UD3 rev1.0 motherboard on SATA ports 0-3 and running AHCI mode. Windows 7 refuses to let me install to any partitions or disks I select saying Setup was unable to create a new system partition or locate an existing system partition. I will get to the bottom of this, after I sacrifice my Friday nights and weekends to Microsoft (they don't just want my money, they want my soul). Keep tuned, if no one has the answer, I will find one. I suspect I have to rip out 3 HDDs so that the n00bs at Microsoft can actually deal with spinning media. Really angers me how paid-for-products are so inferior to Linux they don't even qualify to be called "software".

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  • How do I make YouTube videos fill up an entire screen when using dual monitors?

    - by Jephir
    I am using a dual monitor setup on Ubuntu 9.10 using the TwinView configuration in NIVIDA X Server Settings. My total resolution is 2960x1050 pixels, and my individual monitors are 1680x1050 (primary) and 1280x1024 (secondary). When going into fullscreen mode on any video on YouTube, I only see a cropped version of the video on my primary display as seen below. This does not occur on any other video sharing website - they properly make the video to fill the entire screen on my primary monitor. To my knowledge this problem only happens on YouTube.

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  • Installing isolated instance of MySQL on Windows using silent install with .msi

    - by Abram
    I'm trying to write an installer for an internal application we wrote. After it installs our application it then installs MySQL using the .msi installer in silent mode. I specify the install dir and data dir to that of a directory within my application's install directory, such as: msiexec /i @@MYSQL_INSTALLER_FILE@@ /qn INSTALLDIR="@@INSTALL_DIR@@\MySQL\" DATADIR="@@INSTALL_DIR@@\MySQL\" USERNAME="@@DB_USER@@" PASSWORD="@@DB_PASS@@" (the @@variable@@'s are replace by my installer routine using InstallJammer) Once installed, I use mysqld.exe to install a windows service with a custom service name and defaults file like so: mysqld.exe --install CustomMySQL --defaults-file="@@INSTALL_DIR@@\MySQL\my.ini" This works fine as long as there is not already another instance of MySQL installed. If there is it silently fails to install MySQL. Running the msi installer manually (double-click) shows an error that a previous version is already installed and just aborts. Is there a way to automate installing MySQL as an isolated instance, regardless of whether another version/instance is already installed?

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  • Screenflick Audio option in MacBook Pro

    - by John
    When after I shut down my MacBook Pro by holding the power button for a few sec, (which I found is bad for the computer, so I will not do anymore) I found that my speaker doesn't play until I plug in and out earphone into the machine. When my speaker is not working like this, and when I am on a random webcam chatting site like chatroulette.com, they can hear the music playing on my iTunes when I choose Screenflick Audio option in the Mic setting. But when the Speaker is working back again, they don't hear the music playing even when I do Screenflick Audio mode. How can I make it work? Also, how do you make the chatting partner hear my music playing on my computer while I talk to them (not via my speaker, since it's bad quality).

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  • Linux Mint on VirtualBox has no internet connection

    - by Martin
    Physical machine: Mac Mini running OSX 10.7.5 Virtual machine: Linux Mint 15 Cinnamon 64-bit Using VirtualBox. I am trying to make the linux connect to the internet. For some reason I can access the host computer with 192.168.2.100. Its set up to show me a web-page that says "It works". This I can see from the linux. But I cannot reach anything on the internet. Either FireFox says "Unable to connect" or when I run nslookup google.com I get connection timed out; no servers could be reached. My setting on VirtualBox under the Network tab are: Bridge Adapter vnic0 promiscouos Mode:Allow All`. If it makes a difference, the host has a WiFi connection to the home router. What have I missed?

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  • uWSGI and python virtual env

    - by user27512
    I'm trying to use uWSGI with a virtual env in order to use the Trac bug tracker on it. I've installed system-wide uwsgi via pip. Next, I've installed trac in a virtualenv $ virtualenv venv $ . venv/bin/activate $ pip install trac I've then written a simple uWSGI configuration script: [uwsgi] master = true processes = 1 socket = localhost:3032 home = /srv/http/trac/venv/ no-site = true gid = www-data uid = www-data env = TRAC_ENV=/srv/http/trac/projects/my_project module = trac.web.main:dispatch_request But when I try to launch it, it fails: $ uwsgi --http :8000 --ini /etc/uwsgi/vassals-available/my_project.ini --gid www-data --uid www-data ... Set PythonHome to /srv/http/trac/venv/ ... *** Operational MODE: single process *** ImportError: No module named trac.web.main unable to load app 0 (mountpoint='') (callable not found or import error) I think uWSGI isn't using the virtual env. When inside the virtual env, I can import trac.web.main without having an ImportError. How can I do that ? Thanks

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  • How to add a service to the S runlevel in Debian?

    - by MasterM
    I have the following script (what it does exactly is not important): #!/bin/sh -e ### BEGIN INIT INFO # Provides: watchdog_early # Required-Start: udev # Required-Stop: # Default-Start: S # Default-Stop: # X-Interactive: true # Short-Description: Start watchdog early. ### END INIT INFO # Do stuff here... I insert it into the S runlevel by invoking: insserv watchdog_early The aproriate link is created in /etc/rcS.d: S04watchdog_early -> ../init.d/watchdog_early and /etc/init.d/watchdog_early is executable (has mode 755). Despite all this, it is NOT being run at boot. Why?

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  • How can I prevent a Windows laptop from making noise when starting up?

    - by Walkerneo
    I have a Windows 7 laptop here that makes a noise each time it starts up. I know I can disable that noise now that I'm logged on, but how could I have prevented it WHILE logging on? I remember that there was one of the function keys (F8?) that would allow you to boot into safe mode, but is there a key that will stop the startup sound? Imagine, for example, having your laptop in the library when you know the volume is all the way up - how could you log into your computer without disturbing everyone else?

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  • Xen DomU does not have network connectivity

    - by Prakashkumar Thiagarajan
    I am trying to install Xen on my Fedora box. Dom0 image has network connectivity. But when I try to create a DomU, it does not have network connectivity. I want to be able to run in bridged mode. I have the /etc/xend/xend-config.sxp file accordingly. My config file looks like kernel = "/boot/vmlinuz-2.6.18-xenU" memory = 64 name = "clientA" vif = ['bridge=xenbr0,mac=12.34.56.78.9A.BC'] root = "/dev/sda1 ro" ramdisk = "/boot/initrd-linux.img" extra = "ro selinux=0.3 initcall_debug" features = 'auto_translated_physmap' Am I missing something ?

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  • Block ip for long time

    - by Tiziano Dan
    This question is about a iptables, I wanna to know how can I block these ip for 1hour and not only a little time.. because they make to many sql requests, I'm using it for block but it's not enough because there's anyway 100k ip who attack then too much requests for sql server. iptables -N SYN-LIMIT iptables -A SYN-LIMIT -m hashlimit --hashlimit 8/second --hashlimit-mode srcip --hashlimit-name SYN-LIMIT -j RETURN iptables -A SYN-LIMIT -j DROP iptables -I INPUT -p tcp --dport 80 --syn -j SYN-LIMIT iptables -I INPUT -p tcp --dport 80 -m connlimit --connlimit-above 6 -j REJECT --reject-with tcp-reset How can I make the same but block IP for long time ? (Not manually !)

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  • Windows Server 2008 is stuck at "configuring updates - stage 3 of 3 - 0% complete"

    - by Chris
    This has happened the last two times I've done updates to this system, and I really have no idea what is going on. It is installing a only a month's worth of updates. It only responds to ping and no services are up, so I can't view the system remotely (I have to hook up a monitor to see this message). In the past I've just restarted the system at this point and it eventually finishes updating. I want to know what I can do to avoid this situation, how to diagnose what is going on, and how to get any kind of remote access during the updates. Edit: I can start the machine in safe mode (where I did nothing but backup some files). I restarted and it no longer tries to do a windows update, just goes to the desktop where everything seems extremely broken. I can click on some things, but not launch most programs. I guess all I can do at this point is do a system restore or something.

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  • Establish direct cable connection between Windows 8 PCs in home network

    - by Marie. P.
    I'm running two PCs, a desktop and a laptop with Windows 8 Release Preview ("Build 8400"). They are connected to the same router in infrastructure mode, thereby having wireless internet. Due to often file synchronization between the machines I want to establish a cable connection that allows direct file transfer, without needing to use the wireless. When I plug in the cable (normal, not cross-over), I see in "Control Panel\Network and Internet\Network Connections": "Ethernet - unidentified Network" on both PCs. Transferring a file between both still only uses the WiFi via the Router. I noticed that when turning off the wifi on one PC, I can set up a shared internet connection that will work via Ethernet-cable, but since sometimes only one PC runs, sometimes the other one, I do not want to have the internet of one machine to be dependent on the other one being switched on. I do not have a crossover-cable, but since I did connect the PCs already successfully (just without both being on the internet), I'm sure that this should also work with a normal ethernet cable.

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