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• Can I use one virtualbox disk for multiple machines?

  - by mxp

  I'm not sure what search term to use and skimming through the VirtualBox manual didn't help me either, so I ask my two questions here... My setup is this: PC with dual boot into Windows 7 and a Debian operating system (both 64bit). I've created a virtual machine (Kubuntu, 64bit) under Windows and put it's VDI file on a SMB share of my NAS. Then I created a VM under linux using the same settings for memory etc and assigned the existing VDI file to it. My idea was that I could use that virtual machine from Windows and Linux as well. (1) Is this generally something that should work without problems? I noticed that snapshots get me into trouble because they appear to be not visible from the other operating system: The snapshots I took after installing the guest system are not visible under Linux. That's why I shut down the VM after usage and not save its state while it's running. My current problem is this: I have used the VM under Windows first, then under Linux. Now it will only start on Linux. When trying this on Windows the guest OS detects some kind of hard disk error and fails to boot because it cannot mount its drive. Obviously the virtual hard disk won't fail so it must have something to do with me using it under Linux. (2) How can I fix that? Update: It also looks like any changes I made in the VM under Linux have been reset by trying to boot it under Windows. Looks like it's back to the latest snapshot. I'm confused... Update The answer to my first question can be found below. In short: It works, as long as you don't use snapshots. The answer to my second question is this: Under Windows set the VM back to the latest snapshot and then discard the snapshot so it gets merged. There should be no snapshots left at the end. If you have multiple snapshots, discard the earliest ones first (Snapshot 1, then 2, 3, ...). I'm not sure what happens if you start at the end (.., 3, 2, 1). This of course leads to some data loss since you revert all changes since the last snapshot. But at least the VM is usable again.

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• Free / Cached / Available memory on Linux

  - by pkoraca

  I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios mem_usage script to sum free and cached memory, but would that be correct information? I doubt that they misunderstood Linux memory usage. Lets say I have 8 GB RAM. 5 GB are used, 2 GB is cached, and I have 1 GB of free memory. Real available memory should be free+cached (3 GB)? If some new application would need additional 3 GB RAM, could it take everything from cache and free without using swap, or is there a minimum that should be in cache? Real example: $ cat /proc/meminfo MemTotal: 5984256 kB MemFree: 137052 kB Buffers: 140484 kB Cached: 3439616 kB SwapCached: 244 kB Active: 3148824 kB Inactive: 2341768 kB ... My monitoring tools show that I have 137 MB free RAM, however I have ~3,5 GB in Cache. Thanks!

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• GRUB2 not detecting OS on raid partitions

  - by sleeves

  I have recently added a drive to a system and have successfully raid'ed (RAID-1) the paritions, with the exception of the boot partition. I have it ready and mirrored, but can't get GRUB2 (update-grub) to find it. System: Ubuntu 11.04 Raid Metadata: 1.2 If I run update-grub, it finds the kernel images on the /dev/sda2 partition (present root) but not the images on /dev/md127. /dev/md127 is composed of "missing" and "/dev/sdb2". fdisk on /dev/sdb confirms that sdb2 is of type fd (raid autodetect) and is also flagged bootable. I have two things I want to do. Make the boot.cfg on /dev/sdb2 have a menu option to have the root be /dev/md127 Install grub onto /dev/md127 so the actual boot.cfg from there is being used. Thanks!

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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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• 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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• How do I install yum on Redhat Enterprise 4?

  - by Bob Cross

  For historical reasons, one of the machines that I manage has a Redhat Enterprise 4 boot disk (among others). Every now and then, we have to boot into RHEL4 to bring up some of the legacy software that we support and connect to. Since it's a fringe system, the Redhat support has long since lapsed and I can't convince myself that it would be worth paying just to get RPMs that I can go and get for myself. That said, the default RHEL tools are heavily biased against letting you do exactly that. I would like to install yum and use that as my package discovery and installation. So, is there an installation guide to integrating yum with an older RHEL 4 system?

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• 5 x 3GB drives and 4 x 1500GB drive best raid setup?

  - by Zen_Silence

  Hello, I am building a file server my plan is the have the Operating system on one raid partition and the data storage on another partition. I currently have 5 x 3GB IDE drives that i would like to put the operating system on theses drives are old but that doesnt matter to me at the moment i have a ton of them so for this raid partition i would probably want to be able to pull out dead a drive and rebuild the array. My file partition is going to consist of 4 x 1.5TB SATA drives I would like the maximum storage with some redundancy. Any suggestions to which Raid level i should use would be greatly appreciated and if you could also suggest a PCI or PCI-e raid controller to handle theses arrays. Thanks in Advance, Zen_Silence

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• How do I make a Minecraft kiosk for portable USB drive that boots on most computers

  - by user2044589

  Some time ago, someone referred me to a cool website called Rapid Rollout. It worked fine until I tried to install an OS onto a netbook. To put it short, it didn't work as well as I expected it to. It also didn't install USB flash drives. I'm trying to build a system (or use a service that would create a system) that would open up the Minecraft Launcher (jar) and show it in full-screen with no background. It would also all have to fit into 8 Gigabytes (as this is the most that I can use right now). How can I accomplish this?

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• Setting up Multiple Routers (as Hardware Firewalls) behind a Home Router

  - by Synetech

  I’ve currently got one computer behind a router with built-in firewall functionality, connected to a home cable-modem that has a single Ethernet port and one IP. I’m going to have to set up another computer for the rest of the family to use which of course will need to be connected to the Internet, probably wirelessly since the modem is in my room and the new system would not be. What I would like to do is to get two more small routers with firewall capability and connect each computer to a router, which would in turn connect to the main router which connects to the cable-modem. That way, both systems have a hardware firewall protecting them (particularly the wireless system) and the burden of blocking would be reduced on both the computer CPUs and the main router because the secondary routers would handle some of the workload. I’m trying to find out about the complexities inherent in this design and how I could set it up to work, specifically the IP handling and NAT aspect. Thanks a lot.

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• Explorer.exe - No such interface supported and other issues

  - by tom

  The problem started when I uninstalled my ATI graphics driver and i used a driver cleaner. After i restarted win7 and it got to POST the screen just went completely blank. So i Used system restore from the repair menu to get back on. I found out that if I ran chkdsk the display just goes black after restart on startup and i have to use system restore to get back on windows7 not sure why this is. When i right click desktop and choose 'Screen Resolution' it says No such interface supported. Also when I click items such as device manager in the windows explorer it does not do anything. I have tried re-registering the DLLS but that did not do anything.

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• How to find what is written to filesystem under linux

  - by bardiir

  How can i find out what processes write to a specific disc over time? In my particular case I got a little homeserver running 24/7 and I included a script in the crontab to shutdown all drives that are not used (no change in /proc/diskstats for 15 minutes). But my system disc won't come down at all. I'm suspecting logs but it's probably not only logs writing to the filesystem on the system disk and I don't want to go all the way moving the logfiles to something else just to find out the disc still doesn't spin down and there's nothing i can do against it.

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• Backup of whole harddrive during full operation with Acronis True Image Home 2010

  - by testing

  Currently I'm creating a backup of one of my hard drives. It's my main hard drive, where the operating system is running on. Because the backup is done during full operation I'm asking me if the backup really includes all files (registry, ...). Can I restore the backup on another hard drive and then run the operating system again without problems? Normally I would say that you have to boot from a CD (without running OS) to make a backup. I made a Google research but I didn't found my case so far.

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• consulting a network admin for rails and php applications

  - by Karo Devos

  Hi I'm a web developer who writes most of the time rails applications. Next month I'm going to switch from my current VPS to linode. I'm wondering how much it would cost to properly set (or teach me how to do it) everything to get my app up and running. My requirements are probably: nginx/apache, REE/ruby, passenger, full blown php environment, system wide RVM, search engine such a sphinx, being able to perform cronjobs. I have some knowledge of unix and I was able to install everything I needed on my development system. However I had quite a few issues setting up everything on my production server.

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• Exchange Server 2003 Drive Error

  - by Saif Khan

  My exchange box went offline this AM. The logs show The device, \Device\Harddisk1, has a bad block. I tried running chkdsk D: /x /r but that didn't help either. I went to the Exchange Manager and tried to move the .stm file from D: to C: but got Exchange System Manager The database files in this store are corrupted. ID no: c104173b Exchange System Manager What else is there to try just to get this online for a few hours until I can get onsite to change the drive. This is a Windows Server 2003 server.

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• What is the `shadow` group used for?

  - by Shtééf

  On my Ubuntu 9.10 system, there's a shadow system group. There does not appear to be any user assigned to this group at all. The only files that I can find belonging to this group are /etc/shadow and /etc/gshadow. I'm aware that the purpose of these files is to store the passwords separately, out of reach from regular users who still might want to access passwd for other reasons. But what is the purpose of the shadow group? The reason I'm curious about this, is because I'm thinking about configuring nsswitch.conf to store it elsewhere, and would like to know if anything is actually trying to access the shadow database using shadow group credentials.

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• Backup tape compression

  - by pufferfish

  What things should I check to confirm that compression is actually happening on our tape backup system? Although the tapes are marked as 200G/520G (native/compressed) capacity, they seem to fill up before the 200G mark (some less than 100G). I'm using - Sony AIT-4 tape autochanger - Sony SDX4-200C (AIT-4) tapes - Ubuntu Lucid - Bacula I've tried checking hardware compression with: tapeinfo -f /dev/nst0, which gives Product Type: Tape Drive Vendor ID: 'SONY ' Product ID: 'SDX-900V ' Revision: '0102' Attached Changer API: No SerialNumber: '0001000036' MinBlock: 2 MaxBlock: 8388608 SCSI ID: 1 SCSI LUN: 0 Ready: yes BufferedMode: yes Medium Type: Not Loaded Density Code: 0x33 BlockSize: 0 DataCompEnabled: yes DataCompCapable: yes DataDeCompEnabled: yes CompType: 0x3 DeCompType: 0x3 BOP: yes Block Position: 0 Partition 0 Remaining Kbytes: 201778000 Partition 0 Size in Kbytes: 201779000 ActivePartition: 0 EarlyWarningSize: 0 NumPartitions: 0 MaxPartitions: 0 ... so I presume it's on. Notes: The Bacula documentation says hardware compression needs to be enable with "system tools such as mt"

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• PHP Requests Being Blocked After Making About 25 in Ten Minutes

  - by Daniel Stern

  We have an administrative portal where we run PHP functions through a Javascript portal using ajax for administrative purposes. For example, we might have a function called updateAllDatabaseEntries() which would call AJAX functions in rapid succession, with those functions each executing numerous SQL queries. The problem is after making several successive requests from the same computer (not an excessive amount, maybe 30 in ten minutes) the system will stop responding to any PHP, HTTP requests ETC ONLY from my computer. From other computers in the office the panel can still be accessed, and access is restored to this computer after about 15 minutes. We believe this is not a glitch but some kind of security feature built into our server, possibly relating to Suhosin and likely well-intentioned but currently preventing us from running our system administration. Server Info: Linux 2.6.32-5-xen-amd64 #1 SMP Tue Mar 8 00:01:30 UTC 2011 x86_64 GNU/Linux Cheers - DS

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• How can I send raw postscript to a remote printer via CUPS?

  - by Ash

  I have an ancient fax device with a printer interface that only accepts postscript level 1 documents formatted in a specific way. I only have access to this printer over the lpd:// protocol. I have some old documents from our previous system that work fine on our Unix machines, but they are altered somehow by CUPS when I use lp on our Linux system. The PDF files that end up in the print queue are significantly modified versions of the original, and although they still render in ghostscript, they don't do anything on the printer. I'm wondering if there's a way to tell CUPS "don't process this, just send it to the printer without modification", or whether there's a lpd client or procedure I could try?

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• best way to record local modifications to an application's configuration files

  - by Menelaos Perdikeas

  I often install applications in Linux which don't come in package form but rather one just downloads a tarball, unpacks it, and runs the app out of the exploded folder. To adjust the application to my environment I need to modify the default configuration files, perhaps add an odd script of my own and I would like to have a way to record all these modifications automatically so I can apply them to another environment. Clearly, the modifications can not be reproduced verbatim as things like IP addresses or username need to change from system to system; still an exhaustive record to what was changed and added would be useful. My solution is to use a pattern involving git. Basically after I explode the tarball I do a git init and an initial commit and then I can save to a file the output of git diff and a cat of all files appearing as new in the git status -s. But I am sure there are more efficient ways. ???

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• Convert SQL Query results to Active Directory Groups

  - by antgiant

  Are there any quality products (ideally open source) that allow me to run an arbitrary SQL query that results in 2 columns (username, group name) and they adds that username in AD to a group of that name in AD? If the username doesn't exist it is ignored. If the group name doesn't exist ideally it gets created. Updated for Clarity: I have a MSSQL based system that is the authoritative source for some of the Active Directory Security groups, and their members. I want to be able to to have those Active Directory Security Groups populated by a one-way sync originating from MSSQL. Sadly the MSSQL based system does not have a good API, so I will have to do this with direct SQL calls. Is there anything that does this well?

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• Window will read this particular DVD which it usually doesn't, if it spins for a longer time

  - by curious_kid

  I'm unable to figure out what's wrong with my system. My computer will read this particular DVD sometimes and mostly it won't. When trying to explore the DVD, I get error "Windows can't access this disc" ( note : It doesn't says that the "disc is empty", the normal error which I generally get when I try to read a scratched DVD ). Ok now the mysterious part, I have noticed that everytime DVD spins for a longer time ( like for 1 -2 minutes), window will read it without any problem. Extra information : The DVD I'm talking about doesn't have any scratches. I tried cleaning the DVD Drive with a lens cleaning CD. DVD was burned in multisessions. My system have window 8 installed. Question I wanted to ask : What makes DVD spins for a longer period of time sometimes ? If possible how can I make window spin the DVD for longer time ? Any solution to my problem ?

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• Windows Task Scheduler

  - by Zulakis

  i am trying to deploy a auto-starting program with Administrator Priviliges on our XP-SP1-machines. For this, i am using the Windows Task Scheduler. Since most of our machines get deployed by using a PXE-imaging-system, the Task fails because the Administrator user entered is for example r126/Administrator. If i only enter Administrator then it automatically changes to machinename/Administrator. Since the machinenames are automatically changes by the imaging-system, the tasks fail run. Any ideas on how to fix that?

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• Can I copy from vim to another window without +xterm-clipboard?

  - by GorillaSandwich

  I'm using Ubuntu and vim. I can copy text from vim and paste it into another window by highlighting it in vim, then middle-clicking in the other window. This works fine when I'm on my local machine. I can also copy into the system register by highlighting text and yanking to the system register. (For example, Shift-V JJ "+ y to go into linewise visual mode, highlight two lines, select the '+' register and yank.) It's then available to paste into other windows. However, if I ssh into my web host, I can't do either of these. (They use some flavor of Linux - I think it's CentOS.) In vim, if I type :version, my local version shows +xterm_clipboard, but the host's version shows -xterm_clipboard. I don't have sudo rights there. Is there any way to be able to copy from their vim without getting them to tinker with the installation?

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• Should I buy this particular MacMini?

  - by sil3nt

  Hello there, I'm not certain if this is the forum I should post this in but here goes anyway. So, I'm honestly clueless when it comes to mac's and I've never owned one before, in fact I still don't own anything with "i" in front of it (not a pc fan, but just low on cash you see:) and I was wondering if these specs are adequate? it's a MacMini G4 1.42Ghz, 1GB ram, 80Gb HDD, 32mb gfx The reason I'm looking for a mac is to start out in some iphone development, and I want a system that wont hang. would this particular system be suitable?. I just need it to be usable and not lag.

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• Windows XP, have to use ctrl+alt+delete to log on as local administrator

  - by wickedj

  Hey, I have a weird issue, a user was was logging into a laptop using the local admin account which was working fine. I had to create another account on the system, which was also an admin account, when this happened the 'administrator' account disappeared from the 'choose an account to login with' screen. A quick workaround is available, if the user presses ctrl+alt+delete it brings you to the screen where you can type in the username and password, so by manually typing 'administrator' it can log in. Normally this would be easily fixed, I figured the admin account had somehow been disabled from the local system, but i checked all settings and it is setup fine. The laptop is not part of a domain, so I used the management console to delete the new account and all that succeeded in doing was making the 'choose an account to log in with' screen display no accounts to choose. So far I see nothing else to fix it, the option to change the default logon screen to style where you type the username and password also seems to be missing. any ideas?

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