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• Benefits of a RAID BBU in addition to a double UPS + PS system

  - by Wikser

  Today I roughly measured the benefits of enabling write-back on the RAID controller on a server at work. It got no RAID battery-backup-unit (BBU) so the write-cache is currently disabled. As the server is not used to capacity (by far), the results in most test were spectacular, e.g.: Database CRUD: before 35s, after 4s Saving a 1MB Excel file: before: 20s (!), after: 0.5s Of course having a BBU is always recommended, but what are the main benefits of installing a BBU to a system, which got redundant power supplies and is attached to UPSs? Does this depend on the type of the system (database, file, terminal)? What is a realistic fail scenario which could be prevented by a BBU? Thanks in advance!

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• Determine which version of linux/unix/darwin I have

  - by John

  I have root ssh/terminal access to a linux server. How do I determine which version of centos I have? Some people suggested I run the command cat /etc/redhat-release but I got an error saying file not found. In fact, i'm not entirely sure i'm even using CentOS. That's what some suggested it might be. Here's a list of commands I tried that gave me no file or directory error: cat /etc/*release* cat /etc/*version* cat /proc/*version* cat /proc/*release* Here's a list of linux commands that do not exist: lsb_release: command not found wget: command not found yum: command not found

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• Windows AD: Is loopback processing absolutely necessary in order to apply a user policy to users logging into computers in the OU?

  - by Brett

  I've had our AD setup running on server 2008r2 and now 2012, and I swear, a user policy applied to an OU containing only computers actually does apply to users logging into those computers, without loopback processing enabled. Everything I read seems to say that is not how it should work, but it does. Is this normal behavior? Just tested again - created a policy with a drive map (which is a user policy), applied it to an OU containing my terminal server, forced a gpupdate, logged out/in, and sure enough, the drive is mapped. I did NOT turn on loopback processing.

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• OS X: What does the '@' attribute on a file mean?

  - by claytontstanley

  On a Snow Leopard machine, at the Terminal: la ~/src/rmcl/ | grep RMCL -rw-r--r--@ 1 claytonstanley staff 6766167 Nov 13 2009 RMCL What is that '@' attribute? This file is part of an older OS X program that runs under Rosetta. I'm having issues where some older programs running under Rosetta require the @ attribute when opening files. But I'm not sure what that attribute is, so I have no way to know how to add/remove it. I did try a thorough Google search on this, but I wasn't able to find the answer. I would have thought this would be an easy one to find. Maybe the Google query isn't acting properly because of the single @ special character. Any info. is much appreciated. Thanks!

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• ATI driver in Fedora linux 11

  - by unknown (google)

  I recently built a pc with an ATI Radeon HD 5750. I have installed Fedora 11 and installed the device driver for the Radeon 5700 series proprietary drivers. I wanted to see if there is graphics hardware acceleration. I typed in glxinfo at the terminal and I got: X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 135 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 14 Current serial number in output stream: 14 I don't know how to fix this. I tried to go to the ATI Catalyst Control Center; that worked, but the ATI Catalyst Control Center (Administrator) doesn't work. If anyone knows how to fix this problem then please let me know. Thanks

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• How do I stop ssh-agent from forgetting my password after I login to the screen session from SSH?

  - by Shwouchk

  I have a screen session open in an lxterminal window. If I SSH somewhere, the first time it happens, an ssh-agent window opens and asks me for my private key passphrase, and after that ssh goes right on. If I log in from outside to this machine and attach to the screen session however, ssh-agent now asks me every time I connect for my passphrase, in the terminal. Is there a way to avoid this and to let it continue using the X agent, or at least to have the non-X agent remember the passphrase?

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• Cannot access folder locally, but can remotely

  - by Cylindric

  I'm having a peculiar problem on one of my servers at the moment, which seems to be related to authentication in some way, but I have no idea how to find the root of the problem. I have a folder on the server D:\Somefolder\Logs. If I am connected to the server via an RDP terminal, so essentially "local", I cannot access that folder - I get an access denied. If I am connecting from my machine to it using the share \server\d$\Somefolder\Logs, I can access it. I'm logging in to both machines as the same user. Permissions on the folder seem quite simple, CREATOR OWNER, SYSTEM and Administrators. I am a Domain Admin, and they are in the local "Administrators" group. It is also affecting things like access to SQL Server, so I don't think it's a simple folder-permissions thing. For example, I cannot connect SQL Management Studio to all the local SQL instances using a domain account, but I can if I connect remotely to it.

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• Logging on to server creates duplicate user profiles in Documents & Setting

  - by Tech

  Windows Server 2003. I am having a problem with the creation of new user profiles when logging in remotely to a terminal server. The new user profile gets added under Documents & Settings as username.domainname. Deleting the new profile does not allow the original profile to be reverted to. Went logging on to the server again, it creates another new user profile. Nothing was changed in the Active Directory or security settings. How do I get the original profile to be used?

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• How can I make Bash (or Zsh) run a particular command before each entered command?

  - by Peeja

  I'd like to configure Bash to run a particular command before running each command line I enter at the prompt. Specifically, I'd like to tell Vim (which is running in another terminal) to write all open buffers, because in my workflow if anything's unsaved when I leave Vim it's a mistake. Is there an option for this in Bash? If not, is there an option in Zsh? (There is a readline-based solution that somewhat fits this problem on another question, but it feels a bit hacky. It'll take it as a last resort.)

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• UsrClass.dat does not load, any ideas on what to check?

  - by Bob Simmons

  I have an odd problem where one of my users' UsrClass.dat hive does not load, which causes .NET ClickOnce applications to fail to start. They are one of several users on a Windows 2000 terminal server, all the others have no problem. Nothing is mentioned in any logs. I can manually load the hive to the correct HKEY_USERS\..._Classes location using REGEDT32, which works around the problem, but I've no idea what could be causing this in the first place. Any ideas what to check here, or any diagnostic tools or procedures that would help?

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• Cannot reformat flash drive

  - by user933531

  I have tried to reformat on Ubuntu using gparted, in Windows using their tool, and OSX using Disk Utility. I have also attempted by using the terminal but also failed there. When I verify disk using Disk Utility, I get the following output: Verifying volume “REDSTRIPE” ** /dev/disk2s1 ** Phase 1 - Preparing FAT ** Phase 2 - Checking Directories ** Phase 3 - Checking for Orphan Clusters 168 files, 4507316 KiB free (1126829 clusters) MARK FILE SYSTEM CLEAN? no ***** FILE SYSTEM IS LEFT MARKED AS DIRTY ***** Error: This disk needs to be repaired. Click Repair Disk. But I am unable to repair disk. See OSX examples below:

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• Why is "chmod -R 777 /" destructive?

  - by samwise

  This is a Canonical Question about File Permission and Why 777 is "destructive". I'm not asking how to fix this problem, as there are a ton of references of that already on Server Fault (reinstall OS). Why does it do anything destructive at all? If you've ever ran this command you pretty much immediately destroy your operating system. I'm not clear why removing restrictions has any impact on existing processes. For example, if I don't have read access to something and after a quick mistype in the terminal suddenly I now have access well... why does that cause Linux to break?

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• gevent with Django as daemon

  - by jonathonmorgan

  I've been developing an app using django_socketio (a python port of the Node equivalent), which relies on gevent. It ships with a Django management command that runs gevent's pywsgi server, but that of course stops when I close my terminal window, just like Django's dev server. This is a proof of concept, and there's no expectation that it would hold up in a production environment, but I'd like to have the server at least "permanently" process HTTP requests, so I don't need to manually start the dev server in order to demo. I'm assuming I need to run this as a daemon process, but prior to this I've only used apache and mod_wsgi, so unsure of where to begin, or even how I would go about starting a daemon. I found gevent-spawn, which looks promising, but it's unclear to me how that code is executed. Basically, how would I use gevent to serve a Django app in a setting without manually starting/stopping the server?

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• Changing languages rapidly causes Linux to crash.

  - by eZanmoto

  So I'm running Xmonad on my college computer (which runs Kubuntu) and whenever I leave my desk, instead of using x-screensaver which is incredibly buggy and slow, I just change to another workstation, open a terminal and change language to a language which uses symbols instead of letters, and then change back using an aliased command. For example, my .profile has the lines alias qwer="setxkbmap jp" alias *******="setxkbmap ie" where ******* is my password, using japanese characters. Changing languages seems to be much faster than running x-screensaver. The problem: rapidly changing languages seems to crash Linux; it just won't accept input (and it's not because the language hasn't changed back, nothing is output to the console). I can't use Ctrl+Alt+F1..F7, I can't "raise the elephants", anything, it just won't work. I'm just wondering, is this a known issue, and if so, is there something I can do about it?

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• IP not detected in terremark enteprise cloud server - how to install VMware on instance?

  - by JohnMerlino

  Using terremark enteprise cloud, when you create a server, you assigned an IP address to them and that IP is visible under Detected IP when selecting the server. However, I created a server, with IP address and I created an internet service and connected it with a node. I used protocol TCP and mapped it to port 3001. But I notice when I select my server, the IP address doesnt dsplay under Detected IP and then I VPN Connect, launch terminal and try to SSH with the IP to my server, and I get connection timed out. I presume the reason lies in that the IP address is not being detected. Someone suggested that my VMware-Tools is out of date and in fact on the server instance for VMware-Tools it does say "out of date". I'm not sure how to mount the instance and install VMware-Tools. I am using Mac OSX. Someone said that it will only work on PC running IE.

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• how to copy the results from a grep command to the bash clipboard?

  - by avilella

  If I type something in a Linux bash terminal with no X, and then use Ctrl+u, whatever I typed is stored in the bash "clipboard" (for lack of a better term), and I can type it again doing Ctrl+y. How can I copy the results from a grep command on a text file to such bash clipboard? For example, if I have an INSTALL file like this: ./installprocedure --do-some-long-and-complicated-operation-on-dir dir1 How can I copy the content of a grep command so that it's available doing Ctrl+y? For example: copy content to bash clipboard "grep installprocedure INSTALL" Ctrl+y ./installprocedure --do-some-long-and-complicated-operation-on-dir dir1 #cursor available here

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• User and Key Press Issues with Putty

  - by DizzyDoo

  Ubuntu Server newbie here, got some annoying issues with remote accessing my box with Putty. When I create a user and then login as that user, the terminal always starts with just '#' and not 'user@hostname:~#' which isn't useful where I want to see where I've changed directory too, like I can normally. Also, when logged in as a user, I can't press the cursor keys to move the caret (blinking thing) around, or press up to see previously executed commands. Instead it gives me this representation of the button pressed: ^[[D ^[[A ^[[B ^[[C. Pressing Delete, too, gives me ^[[3~. This is all strange to me, because when logged in as root, it all works fine. I'm hoping this is just something I've accidentally changed in Putty, or added the user wrongly, or perhaps just got caps lock on. Thanks.

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• How do I restore the Gnome Panel volume control in Ubuntu 10.04?

  - by Neil

  I use alsa, and I don't have a volume control applet on my Gnome Panel. When I right click and select "add to panel", there is nothing that has to do with "sound", "audio" or "volume" in the list, and the "Indicator Applet" or "Indicator Applet Session" things have no volume controls, or properties that would let you enable any sort of volume control. How can I get a volume control in Ubuntu, so I don't have to run aumix in a terminal or something? I've been using Linux since Redhat 5, it's beyond me why these sorts of problems are still around. Someone should just put a damn "Volume Control" element in the list of things to add to the panel, even if it doesn't work, perhaps showing an error message.

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• No colors when running native windows shell application from mintty

  - by Pete

  Hi. I have installed cygwin (i'm not very experienced with it), and try to run a native windows shell application from it, (msbuild.exe which is the build tool for the .NET framework, to be exact). When I run the application from the normal cygwin bash shell, the output of the application appear as it should with the text colors that I would normally see in the windows command line. But when I execute the program from a mintty terminal, there is no coloring of the output, all text is in the default foreground color. I'm puzzled, because I would have expected the color coding to be the standard ANSI color code escape characters... Can this be fixed?

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• How can I copy files to an external drive and verify their integrity in OS X?

  - by jedavis

  I'm moving large amounts of data from one external drive to another larger one. The files are important and the smaller drives need to be cleared and reused (HD camera). Is there some utility for moving files and verifying their integrity? I've been using this command find . -type f -exec md5 '{}' \; > md5list.txt in the terminal to create a list of MD5s for each file then using diff to compare the two. However, I am moving 320GB at a time, which takes a while by itself. Computing the checksums takes another hour or so. It would be much more efficient to do this on the fly, during the copy. I'm just hoping someone has already written the software...

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• df-h command in ubuntu

  - by Esha Sharma

  I am a new user of Ubuntu. When I type df -h in terminal , it gives me list of all storage devices and space usage. In my system I get this. Filesystem Size Used Avail Use% Mounted on /cow 934M 173M 761M 19% / udev 925M 4.0K 925M 1% /dev tmpfs 374M 856K 373M 1% /run /dev/sdb1 7.5G 2.8G 4.8G 37% /cdrom /dev/loop0 1.5G 1.5G 0 100% /rofs tmpfs 934M 16K 934M 1% /tmp none 5.0M 0 5.0M 0% /run/lock none 934M 76K 934M 1% /run/shm /dev/sda 299G 74M 299G 1% /media/q I understand that /dev/sda is my hard drive which is 320 gb(in gib it is 299 and hopefully that is what is being displayed) and /dev/sdb1 is pendrive of 8gb from which I am running the live cd. My question is what are the other folders and what is the physical location of these folders if complete memory is taken by the device dev/sda?

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• Virtualbox VM (spawned by Vagrant) running but inaccessible. What now?

  - by Matt V.

  I have a Virtualbox VM running Ubuntu that was started by Vagrant. At some point my ssh session connected to the guest stopped responding. I tried "vagrant halt" from a terminal window on the host (OS X). The shutdown process seemed to also hang. Shutting down the Oracle VM VirtualBox Manager doesn't shut down the VMs themselves. Is there a way in either Vagrant or VirtualBox to force the running VM to shutdown? When running desktop guest OSes, closing the GUI window presents several options for shutting down the guest, but I don't know how to do the equivalent when the guest is running headless.

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• Cannot use `su` or `sudo` after set up key-based access to SSH

  - by OrangeTux

  I'm following this tuturial to setup key-based access to the SSH I created a user. I add copy the key to the client via ssh-copy-id <username>@<host> Becasuse ssh <username>@<host> still prompts for a password I run ssh-add on the local machine. The terminal doens't prompt for a password, I can login without using a password. But I cannot run su anymore. Every input for the password results in Authentication failure. I tried it again. But before coping the key, I added to the sudoer file. Copied key, ssh-add. But now I cannot login to my SSH shell att all? How can I setup a key-based SSH access with the possibiluty to use su or sudo?

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• Authentication error in LTSP client

  - by sat

  I am building a LTSP server with LDAP authentication for LTSP Clients. I have configured LDAP server also. When I try to login from LTSP client in GUI, I am getting No response from server, restarting. Then, It's restarting the GUI and comes to the login screen again. I thought that there could be a problem with LDAP authentication. But, When I try to login from Alt+Ctrl+F1 terminal in LTSP client, it is logged in successfully with LDAP user. LDAP Server and authentication is working fine. Even, after executing the below commands, still I am getting the same error. ltsp-update-sshkeys ltsp-update-kernels ltsp-update-image --arch i386 Whether I need to configure anything for GUI login from LTSP Client? How to fix this issue?

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• How can I get the current OU with a PowerShell login script?

  - by Frans

  I am setting up a Terminal Server 2008 which will be used by different client organisations, each with multiple individual user accounts. I would like each client organisation to have a drive mapped to \server\clients\ Their OU name is also their client name, so I would like to be able to find their current OU and then use it for the mapping command. The OUs are hierarchicals, so it is the bottom-most OU name I need. Example OU: Dedicated Clients\AjaxCorp Should get a drive mapped to \\server1\shares\AjaxCorp Any suggestions on how I can get the OU? I am sure it must be easy, I just haven't figured it out... I did find information about how to do this with VB script, but as it is a whole new environment I thought it would be nice to use PowerShell instead.

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