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• Debian, CentOS, Slackware, FreeBSD, OpenSolaris and Ubuntu Server Edition: Which one to use for an http web server?

  - by Ako

  I am going to install and administrate a virtual server for a small university. The server should run inside a virtual machine (VirtualBox OSE). It is only used in the university network and is invisible to the outside world. It should run Apache web server for PHP, MySQL and probably a mail server. I don't know which OS to use. Main criteria for choosing include ease of administration and updating, package management and performance. I wonder if anyone has any suggestions? And candidate OSs are: Debian, Ubuntu, CentOS, Slackware, FreeBSD, OpenSolaris. Add any other OS if you know any better alternatives.

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• Ubuntu Tools for recovering data from damaged USB Flash Drive ~ 10 Gb

  - by PREDA LUCIAN

  I have technical issues with my USB Flash Drive - JetFlash®V15 (TS16GJFV15) It's very critical situation because I can not see the data from it and I should get a way to recover them ASAP. So, in general, I have connected Non-stop that USB Flash Disk at my laptop. Was appear Power surges and when I was coming back, I saw that problem with it. Details regarding JetFlash®V15 (in present): - when I connect it on USP slot, the led is working intermittent and later on remain with constant light. - if I inspect the computer drivers, I found "Generic USB Flash Disk" (when the stick it's connected). - if I inspect "Properties", I can see next details: --- Type: unknown (application/octet-stream) --- Size: unknown --- Volume: unknown --- Accessed: unknown --- Modified: unknown I inspected that stick on 2 different computers (as well in different different USB Ports) and was the same problem, I can not see the content. I was checking with Windows 7 and Ubuntu 10.04 OS, but without success. With both OS was working before this issue. I'll appreciate an answer which will solve the problem, not an answer which will certify the problem. What I have to do, to recover the information form it (nearly 10 Gb)? I'm looking forward to be guided from a technical expert.

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• Windows undetectable after interrupted chkdsk

  - by Felthragar

  I have a computer that is running Windows XP. For some reason, the other day it wouldn't start giving me the following message: "ntoskrnl.exe is missing or corrupt" So I put the XP disc in the tray and fired up the repair console and ran the following: chkdsk /r It was on for about eight hours and it got to about 52% I believe. Then there was a power outage and the computer shut down (obviously). Today when I was booting it, it isn't even detecting there's an OS anymore. If I boot the computer with no cd in the tray it says: "Reboot and select a proper Boot device or Insert Boot Media in selected Boot device and press a key" If I run the repair console, or the xp installation program it isn't finding any OS installations. Any ideas on what to do next? Any help is appreciated. Thanks! Update: After turning boot-time diagnostics on, I got this message when booting without cd (instead of the previous one): "Couldn't open drive multi(0)disk(0)rdisk(0)partition(2)"

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• Invoke host's workspace switcher from inside VM

  - by Paul

  When I start a virtual machine (like VMware or VirtualBox) and set it full screen then, from the host OS (in this case Ubuntu), I can beautifully switch to it with the Workspace Switcher. So I switch to the VM like I switch to a virtual screen. But switching back -- from the VM to the host's virtual screens -- seems to be impossible because by entering the VM I loose the host's workspace switcher. Is there a nifty workspace switcher program that runs inside the VM and is able to switch workspaces of the host machine? Edit in light of Frank Thomas' answer, can we configure VirtualBox (or VMware) to not send certain key combinations to the VM, but keep them to the host? Like Super+S. In that approach I would sadly have to miss the nice workspace switcher icon in the guest OS, but that's OK if at least the keyboard trick would work.

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• 3 Root accounts in MySQl database

  - by hairbymaurice

  Hello, I have managed to get mySQL running under Ubuntu 8.10, I am now diligently trying to secure the database and am adding passwords for the root users. My question: I have a root user under the host "kickseed" with no password set I have no idea what kickseed is as the database is installed under localhost, on searching around i have discovered that this is something to do with the ubuntu OS itself. Is it safe to delete this user account from MySQL or is it used for something by the OS? If i need to keep it should i /can i protect it with a password? Also i have another root account under the host IP 127.0.0.1 again can i delete this? My absolute preference would be to have only one account with root access but i do not want to delete these accounts if they are necessary. Thanks for tolerating a newbie Regards Hairby

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• Apply SetEnvIf after Apache RewriteRule

  - by coneybeare

  I have a working apache rewrite rule: RewriteCond %{HTTP_HOST} ^.*foo.com RewriteRule (.*) http://bar.com$1 [R=301,QSA,L] and some working dontlog SetEnvIfs: SetEnvIf Request_URI "^/server-status$" dontlog SetEnvIf Request_URI "^/home/ping$" dontlog SetEnvIf Request_URI "^/haproxy-status$" dontlog SetEnvIf User-Agent ".*internal dummy connection.*" dontlog CustomLog /var/log/apache2/access.log combined env=!dontlog but I can't figure out how to stop the RewriteRule from logging a duplicate line. foo.com and bar.com are both on the same machine. I would expect this rule to work, but it did not: SetEnvIf Host "foo.com" dontlog I still get duplicates in the Apache Log: 10.250.18.97 - - [06/Apr/2012:16:57:12 +0000] "GET / HTTP/1.1" 200 732 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko) Version/5.1.5 Safari/534.55.3" 68.194.30.42 - - [06/Apr/2012:16:57:12 +0000] "GET / HTTP/1.1" 200 732 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko) Version/5.1.5 Safari/534.55.3" .... where 10.250.18.97 is the server's IP. How can I prevent that RewriteRule from logging?

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• why is 64 bits version called AMD64 and 32 bits version called i386?

  - by ajsie

  I have never understood this. This is what i know: 64 bits OS if you want to handle more than 2GB RAM. Else, 32 bits OS. So on Ubuntu's homepage you can download either 64 bits or 32 bits. But the 64 bits is called amd64 and the 32 bits is called i386. So i have to have a AMD processor to run amd64? And intel to run i386? And if someone codes a software (lets say Apache). Does he have to code one 32 bits and one 64 bits? Do some softwares only exist for 32 and not 64 and vice versa? Thanks in advance!

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• Download YouTube via command line

  - by Maroloccio

  In Firefox I use "DownloadHelper", is there a Mac OS X || Ubuntu command line tool that downloads YouTube videos for offline viewing?

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• How do I remote desktop to my work's Windows box from my Mac at home through VPN?

  - by CT

  I would like to remote desktop from my Macbook to my Work's laptop from home. I connect to the work's network via Cisco VPN. My Cisco VPN clients connects fine in Mac OS X but I am unable to remote desktop. I am also unable to ping my work laptop. The laptop is powered on and not sleeping. I can access it via LogMeIn. If I were to actually pug into our network at the building. I can remote desktop to my work laptop from my Macbook. If I use a Windows virtual machine and connect using the Windows Cisco VPN client, I am able to RDP and ping my work laptop. What is wrong with my OS X VPN connection?

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• Ubunto 12.10 Boots to purple screen

  - by Ric

  I know this question has been tackled in a couple different threads but I've tried what I could from those and have not resolved the issue. I have just a basic understanding of this system so feel free to talk down to me or explain this like you would to a 5 year old. Let's start from the beginning. My son has a computer built by an IT friend of mine (we moved so he can't help any more). It had Windows XP running on it and it just stopped working correctly. This same friend had built a laptop for me with Ubuntu which I liked so I thought I'd put a new OS on my sons computer and it may work better. I downloaded Ubuntu 12.10 onto a USB drive and loaded it onto his computer. I followed all the prompts, it installed, I restarted the computer, it gives me the option of which OS to pick. I pick Ubuntu and it seemingly loads. The desktop comes up with just the basic pinkish Ubuntu background but that is it. There are no icons. I can't right click anywhere to create a file. Left clicking the mouse does not create a square when moved. Alt + F2 doesn't do anything. I can open a terminal but any of the commands I have seen in previous threads do not correct any issues. What else can I do, or what resources are available to fix this problem? I don't know if there are additional files on the USB drive that I need to access or what. Also, one of the problems we were having with my sons computer is that windows would only load to a blank screen. It runs accordingly in safemode and my install of Ubuntu was through safemode of Windows XP.

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• Using my System as the server- need advice

  - by Ashwin

  We are deploying my web application in my system in jboss. And I am planning to use my system as the server as well. There are no html pages or jsp pages deployed. The client requests for resources and the server provides the resources in the form of objects. We are also using databases(Postgresql-15 tables) as the database server(this will also reside in my machine). My system configuration is Windows Vista, 2.3 GHZ, 4GB Ram, 32 bit. There can be many requests coming in at the same time. So is this configuration enough? Should we go with a different Operating System like Windows Server? I have never used Windows Server OS. How will it be different from other windows operating systems? Or if you feel please some other OS will be good in this situation, please suggest.

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• Need to move a debian server from i686 to x86_64 architecture

  - by user64204

  I have a debian server that I need to move from one hosting provider to another. I don't really know how the old server was setup, all I know is that it's running a Ruby on Rails application with a lot of custom libraries installed and that I should prepare myself for a painful migration. Old server: -os: debian 5.0.9 -used disk space: 3.2GB -architecture: i686 New server: -os: debian 5.0.9 -free disk space: 10GB -architecture: x86_64 As you can see the problem is that the servers are running different architectures. Q: Is there anyway I could somehow migrate the old to the new server in a few steps (or am I just dreaming I could) ? I was thinking maybe I could: -get list of packages and gems installed on old server and use for loop to install them all on the new -copy the disk content from old to new server while excluding what is architecture-specific (the problem is that I don't really know what to exclude).

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• Reiserfs partition data recovery

  - by user991554

  i am having windows xp as my os. but i have raiserfs partions created by suse linux on same HDD. i need to recover data from the linux partitions now. i created opensuse live usb and booted from it. but it is showing free space in disk manager instead of linux partitions. but i accessed from one windows application(e.g Ext2Read ) which is showing linux partitions but not able to recover data from them as they are demo applications. why opensuse live usb os showing free space instead of linux partitions. Any other metyhod to recover data from them?

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• How did we get saddled with the (hierarchical) filesystem as the basic data structure?

  - by user1936

  I'm self-taught and I don't have a CS degree. The more I've been learning about data structure, the more I wonder, in this day and age, how are we still saddled with the filesystem, with directories and files, as the basic data storage structure on the OS? I understand the simplicity of it, but it seems nowadays that there could be more options available natively. As far as I'm aware, the only project to improve the basic functionality of the filesystem was ReiserFS, where you could tell what line of a file was changed by whom, and when. For instance, if I could have native tagging for files, where I could tag images, diagrams, word-processing documents, an entire code repository, all as belonging to a single project, that would really be helpful to me. Since I'm stuck in the filesystem paradigm, I know that I could put all those into a single folder/directory, but what if they already exist in disparate directories, and they need to stay there? I know there are programs out there that can do this, but why aren't they on the filesystem? Something that would be nice to have is some kind of relational feature in the filesystem, like you get with RDBMSes. I understand that that was supposed to be part of Vista/7, but that fell off the feature list too. Sure, any program can store a binary file and have any data structure it wants in it, by why couldn't the OS offer more complex ways of storing data, beyond the simple heirarchy of the filesystem?

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• Terminal Server 2003 Performance Troubleshooting

  - by MikeM

  Let me get your thoughts on terminal server performance problems. The server hosts average 25 users which, after running some numbers, on average use 600MB memory with their main applications running (web browser, adobe reader, IP phone client). All users are on the same LAN as server. We constantly experience slow response and short session lockups. Combined CPU usage is on average 10%. What appears strange to me is that the system shows 29GB physical memory with 25GB of it free. The page file usage is about 50% averaging 9GB used. Some server specs OS: Server 2003 32bit Enterprise with /PAE flag RAM: 32GB CPU: 2xQuad Core @ 2.27Ghz HD: RAID5 1.2GB After doing basic troubleshooting using performance monitor it leads me to believe that the performance problems are caused by the 32bit OS limitation in addressing full 32GB of physical memory even though the /PAE flag is used. Can anyone suggest something, troubleshooting steps that can lead to a more conclusive answer? Thanks

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• Windows 2008 Server SP2 64bit - TCP Connections never releasing after TIME_WAIT

  - by Peco

  Hello fellow admins :) We have an issue with Windows 2008 Datacenter edition SP2 64bit. We have a process that is polling very frequently and establishing new TCP connections. The system gets in a state where we end up with over 16k connections in TIME_WAIT state. The default OS timeout is 120 seconds after which these connections should go away, but that never happens. These connections persist and never get cleaned up even after the originating process has long terminated (we are still at 16k connections two days after the process was killed). The OS is supposed to time them out but it doesn't. Has anyone else seen this behavior and if so what was done to resolve it. We are aware of how to tune the tcp stack to make the timeout shorter or allow more connections but this is not the issue here. Thanks!

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• Keyboard-Shortcut driffen Utility to move windows around on multiscreen setup

  - by Wolfgang Fahl

  I am looking for a utility to move windows around on a multiscreen (usualy dual screen) setup. So with a keybord shortcut (or mousclick) I would like to send a windows to another monitor. I am using this functionality a lot when I give presentations. I'll lookup something on my mainscreen and then send the window to the screen or beamer where others can see it. Its also useful when working or when I want to send a screen from my computer to the TV screen that is hooked up to the computer. I know two solutions for a) Windows b) Mac OS but none yet for Linux. I'll post my windows and Mac OS solutions as answer and would be interested in other opinions.

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• GUI based backup utility [closed]

  - by Chethan S.

  Possible Duplicate: Comparison of backup tools I have read favorable reviews for 'Back In Time' for the purpose stated above. Still I am posting this question as I have some demands in my mind. Few years back I was using ThinkVantage Rescue and Recovery by IBM on my Lenovo PC under Windows. That provided me nice features like compressed backups, boot time options - OS Repair, Restore entire OS, restore entire system to an older date, restore individual files etc. Out of these the feature I liked the most was compressed backups. Similar features are available in software like Norton Ghost too. In Back In Time I was surprised to see that the snapshot takes up same amount of space as that of the original contents, no compression at all. Furthermore, I was not able to find options to change the compression ratio etc. under settings. According to me compression of backups is a must have feature. Therefore, can anyone suggest me any other utility which can serve the purpose. I insist on GUI based tool since I don't want to mess up with backups!

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• What applications is NTFS preferable for? [closed]

  - by javano

  When building a new server I prefer to deploy Linux as my OS of choice. This gives me the luxury of being able to choose from various file systems (amongst other aspects), and I will choose a different FS for different servers, depending on what they will be used for. With Windows OS variants you can only use NTFS. Have any benchmarks or tests been performed that have shown NTFS to be a preferable choice for a given scenario or application (apart from just "running Windows" because it has to be on NTFS). To clarify what I mean; I might use filesystem X for large transactional storage volumes, but filesystem Y for front end web app servers. If I had a multi-platform application to deploy that (let's pretend) was available on Mac/Win/Lin, is there any type of application or scenario that would benefit from being on NTFS?

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• What do you do to balance the upper or lower case style to name file or folder between work and life? [on hold]

  - by sojyq

  I am a programmer from China. And I like to use English words to name my files and folders Whether it is for work or life. For example, suck as Movie, Work, QtProjects, Music and so on.And I keep the habit of initial the first letter for file name or folder name in Windows. But now I work on Ubuntu, and I found that all file name and folder name are lowercase in addition to the default folder such as Music, Movie and so on. And then I realize that in Linux world, most peoloe like to use all lowercase to name their files and folders for two reasons (1. Linux is Case sensitive. 2. It is fast for shell command.). And after work, when I switch from Linux to Windows, I confuse to use all lowercase or the first letter uppercase style to name my files in Windows. I'm caught in a dilemma. I think that all lowercase is more efficiency but the first letter uppercase is more readable. I thought for a long time and want to come up with a good answer to blance the two style name conversion. But I failed. I want to ask you that how you balance the uppercase or lowercase habbit in Windows, Mac, Linux between work and personal life style? Thank you very much! (My current solution is that when I am in Linux, I use all lowercase for files and folders, but when I am in Windows and Mac OS X, I couldn't find a good reason to convince me to use all lowercase ( I think in Windows and Mac OS X, the first letter uppercase style for me is more readable and beautiful).

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• Error: kernel headers not found. (But they are in place)

  - by Guandalino

  I'm trying to install the Guest Additions in VirtualBox 4.04. Host OS is Ubuntu desktop 11.04 64bit, guest OS is Ubuntu server 11.10 64bit. $ sudo ./VBoxLinuxAdditions.run After some output this line is printed: The headers for the current running kernel were not found. But the headers are installed, at least accordingly to dpkg: $ dpkg --get-selections | grep linux-headers linux-headers-3.0.0-12 install linux-headers-3.0.0-12-server install linux-headers-server install The running kernel is: $ uname -a Linux foobar 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011 x86_64 x86_64 X86_64 GNU/Linux How do I fix things so that Guest Additions installer is able to find kernel headers? Update: added full output. The headers for the current running kernel were not found. If the module compilation fails then this could be the reason. Building the main Guest Additions module ...done. Building the shared folder support module ...fail! (Look at /var/log/vboxadd-install.log to find out what went wrong) Installing the Window System drivers ...fails! (Could not find the X.Org or XFree86 Window System). I don't care for fail #2, because that's a server and I don't need X server. But I need shared folder support. Some further detail: $ tail /val/log/vboxadd-install.log .......... cc1: some warnings being treated as errors make[2]: *** [/tmp/vbox.0/vfsmod.o] Error 1 make[1]: *** [_module_/tmp/vbox.0] Error 2 make: *** [vboxsf] Error 2

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• Computer temporarily freezes and then resumes

  - by trizicus

  This happens on ALL operating systems (7, Ubuntu, etc.). What happens is everything for 1-3 seconds becomes unresponsive, I then hear what sounds like my other internal hard drive 'spinning up', and then viola everything is responsive again. Note: Already ran SMART tests, no issues at all. I think issue is that the HDD spins down and when need it gets 'turned-on' (OS settings turn off HDD's after 20 mins of inactivity) and because my pagefile is on the other HDD it causes OS to temporarily freeze. Need more tips, and insight. Thanks More info: Running Quad CPU, 4GB RAM, Intel SSD, GT 240.

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• System in low graphics, deleted linux, grub rescue, can't access windows

  - by First timer

  So I'm pretty new to Ubuntu but I managed to install it with no big problems on both my desktop and netbook. When I installed it on my brother's netbook everything went horribly wrong and now I fear the system is close to beyond repair. The problem was first that it said it did not have any space left (seemed ridiculous since it had a lot). Then Ubuntu began booting into a "System is running in low graphics mode error" which I then tried to fix, using all the tips I could find in here but nothing helped. I think the graphics error and lack of space might have been related but I can't be sure. Finally I gave up repairing Ubuntu and went for a reinstall. Shouldn't have done that! I read that I should simply open Ubuntu through a live usb and choose GParted to delete the Linux partitions so I did and rebooted accordingly. Next, I was to install Ubuntu but now I am only given the option to wipe the whole disk for Ubuntu, not install along with windows 7. If I access GParted I can still see the ntfs partitions that hold windows 7 (there are 2: one labeled RECOVERY and another labeled OS and boot) so why can't I access them? Btw. the OS and boot has a little red mark with a warning that 1 cluster is referenced to multiple times, don't know what that means. If I boot without the live usb I am sent directly into a grub rescue "black screen of the computer will follow no orders". Please, I know that the easiest might be to simply wipe the whole thing clean but there are important files and programs on windows 7. Is there a way to just access windows? It is a dell inspiron 1018 mini netbook, so I have no cd input and no windows 7 installation cd.

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• windows 2003 download utility from command line , http or ftp or any other protocol , from one comma

  - by Michael

  Hello , I need to know if there is anyway utility bult-in windows 2003 that I can use from the command line to download a file using only one command. Basically I know that I can download from ftp using the "ftp" utility but in order to do that I need to do first "ftp open" and then pass the other commands so it doesn't help me because I need to do perform the download only from one command. The download may be performed through http, ftp or any other protocol. OS Name: Microsoft(R) Windows(R) Server 2003 Enterprise x64 Editio OS Version: 5.2.3790 Service Pack 2 Build 379 Thank you in advance for any answer !

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• NMap 6.01

  - by TATWORTH

  NMap 6.01 has been released at http://nmap.org/download.html"Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, but works fine against single hosts. Nmap runs on all major computer operating systems, and official binary packages are available for Linux, Windows, and Mac OS X. In addition to the classic command-line Nmap executable, the Nmap suite includes an advanced GUI and results viewer (Zenmap), a flexible data transfer, redirection, and debugging tool (Ncat), a utility for comparing scan results (Ndiff), and a packet generation and response analysis tool (Nping)."Home page is at http://nmap.org/  Nmap is free to download and use. You can download the source and compile it yourself if you so require.

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