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• Compaq Presario V2000 Vista/7 trial virtualization

  - by James Schweninger

  I am currently studying for an A-Plus certification to which was recently added troubleshooting Windows 7 to the exam. You also have to be very familiar with Vista as well. I only have XP on my Compaq Presario V2000, but I wanted to set it up ( I believe I have the minimum requirements for both ) so that I could run trial versions of Vista and 7 virtually.Windows 2000 is also on the exam. Is there an easy legal way to do this? I wouldn't mind partitioning my HDD for the four operating systems either. Thnx if you have any ideas, JLS

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• OpenBSD: Gateway outside subnet (works in Linux)

  - by kshade

  We need to set up an OpenBSD host to use a default gateway that's outside of it's subnet. This is all I need to do on Linux (not the actual IPs) to achieve it: ifconfig eth0 33.33.33.33/31 up route add 33.33.33.254 dev eth0 route add default gw 33.33.33.254 The problem is that we don't know the proper equivalent of the middle command in OpenBSD. The man page says: If the destination is directly reachable via an interface requiring no intermediary system to act as a gateway, the -iface modifier should be specified; Sadly we can't seem to figure out how to make it work with that. This is a virtual host on an OVH server, they have documentation for many other operating systems showing how to do it here: http://help.ovh.co.uk/BridgeClient

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• How can I get OS/X-like switch windows of same program bound to hotkey with linux GUIs?

  - by dbenhur

  On OS/X, Command-~ switches between windows associated with the program with current focus. This is very handy when toggling through a set of browser windows or editor windows, for example. A couple years ago I noticed someone using similar functionality on a Gnome linux laptop and they showed me how to set it up, but I forgot the details (so I know it's possible). I frequently switch between MacBook and a variety of linux systems running Gnome, Unity, and occasionally KDE. My Google-fu failed so I turn to stack exchange: How do I bind Alt-~ or similar key to give me functionality to switch between windows of program with current focus?

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• Type 1 Hypervisor on the desktop

  - by Blazemore

  I have a powerful home PC, and I've used VirtualBox to run Linux distros in Windows (and vice versa). I'm interested in trying out a lightweight type 1 hypervisor to run all my operating systems (Windows 7, Debian, Arch) and was looking for suggestions of which to pick and how to implement this. From what I gather, a type 1 hypervisor is a lightweight OS which simply provides VM management functionality. Will I get reasonable performance under each guest OS? Can all the guest OSs have access to a shared data drive, or is is best to have a storage server in another guest OS and mount it over the virtual network? What about gaming, is this feasible, or will I realistically need to run Win7 on bare metal? I'd appreciate any input.

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• Development environment clean installation

  - by ruigoncalves

  Hi there! I'm about to install a new and clean development environment. To accomplish that, I would like a Windows operating system (possibly Windows 7) and a Ubuntu one (possibly the most recent, 10.04). To allow sharing data between the two operating systems, I'm thinking to create a partition (workspace, for example) with using NTFS to format it and that be automatically mounted by Ubuntu. In terms of the partitioning schema, how would be better to organize the previous mentioned partitions? Thanks in advance, Best regards!

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• Unreliable resume from suspend?

  - by dsimcha

  My desktop PC (home-built) resumes from suspend somewhat unreliably. I'd say that it resumes successfully about 85-90% of the time and hangs with a blank screen 5-10% of the time. As far as I can tell, the success or failure of the resume is completely random. I doubt it's a software problem because I triple boot Windows 7, Windows XP and Ubuntu and it's similar under all 3 operating systems. If it matters, my system is overclocked, though other than the resume-from-suspend issue, it's definitely rock stable. What are some of the obvious suspects that would cause random, sporadic failures to resume from suspend?

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• Windows Media Player functionality for Ubuntu

  - by Xeoncross

  I have way to many music files to bother with setting up playlists. Especially since my files locations keeps changing as I move stuff around and swap between different computers, different mount points, and even different Operating Systems! So managing my media with any application is doomed to failure. However, since I still want to listen to the music I usually just select all the files I want to play at a time and then right-click to open them in a media player. Works great in windows media player and places all the tracks in a temp playlist on the sidebar. Fails in ubuntu using Rhythmbox since it doesn't understand "temp" playlists and just keeps adding files to your FULL listing of all sings on your whole computer. I have over three copies of some tracks now in my audio collection - and all of them are now invalid because the location of the files has changed. So what media player (for Ubuntu) works well with just temporary playlists and will allow me to open up my files without adding them to a collection?

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• Gentoo+urxvt+terminus: How do I change font version?

  - by gaidal

  In my Debian installation I can type extended ASCII characters such as åäö by default using the terminus font, however in Gentoo I can't get it to work so far. Nothing happens when I hit those keys, like in this thread: Missing glyphs in Terminus font, how to setup a fallback font ? But in this case I know terminus supports those characters in at least some of its versions, since it's works in Debian. So what I want is to find out how to see and choose which of the many different terminus font files is being used. I set the font in the same way on both Debian and Gentoo, using URxvt*font: xft:terminus:size=xx in .Xdefaults. Both systems use en_US.UTF-8 as default locale.

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• System Center 2012 R2 System Discovery Network Utilization

  - by AtomicReaction

  I'm in charge of a deployment of Microsoft System Center Configuration Manager 2012 R2. Currently, I'm working through the discovery methods and trying to decide how to enable automatic discovery of systems and users. On Microsoft's documentation, they warn that Configuration Manager Automatic Discovery traffic can get pretty significant if you aren't careful in your implementation. Can anyone who has used this give me some information on how much traffic I should expect? We currently have around 1000 computers and 4000 user accounts in Active Directory. Thanks!

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• Override template shell on linux system in Active Directory domain?

  - by benizi

  Is there an easy way to override the Samba "template shell = /bin/bash" setting on a per-user basis? This is for Linux systems joined to an Active Directory domain. Some users want /bin/bash. Others including myself want /bin/zsh. Is there some AD attribute I can set? Anything I've found via googling seems hackish at best (writing a script to replace /bin/sh -- maintenance hassle). A similar serverfault question Override LDAP shell seems OpenLDAP-oriented (but if someone knows how to get it working with AD, please say so).

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• Gnome+NX clipboard behavior; auto-copy on select?

  - by threecheeseopera

  I am having issues with the Gnome(/Linux/Debian+Ubuntu) clipboard when connected remotely; it's default behavior appears to be to automatically add text to a clipboard buffer when that text is selected. This is not usually a problem, until I need to log into one of these systems remotely (w/ GUI), and attempt to use a shared clipboard. If I 'copy' text on the local machine (destined to replace some text on the remote machine), that copy buffer is overwritten as soon as I select the text on the remote machine to be replaced. Is there some way around this? It sort of drives me nuts. Thanks! UPDATE: This is really an NX server issue; X11 supports multiple clipboards ("selections": clipboard, primary. secondary; see this excellent article) that behave differently, and it appears that my problem is related to how NX server translates this over to the host machine.

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• Do I have a bad SD card?

  - by User1

  I'm trying to copy data from my computer to an SD card. After a few hundred megs, I keep getting the following errors in dmesg: [34542.836192] end_request: I/O error, dev mmcblk0, sector 855936 [34542.836284] FAT: unable to read inode block for updating (i_pos 13694981) [34542.836306] MMC: killing requests for dead queue [34542.836310] end_request: I/O error, dev mmcblk0, sector 9280 [34542.837035] FAT: unable to read inode block for updating (i_pos 148486) [34542.837062] MMC: killing requests for dead queue [34542.837066] end_request: I/O error, dev mmcblk0, sector 1 [34542.837074] FAT: bread failed in fat_clusters_flush [34542.837085] MMC: killing requests for dead queue These were all files I copied from a smaller SD card. I just want to transfer them to my new, larger card for my phone. I tried the same experiment with different files on a different machine and the card failed again. Reading data from the old card went fine. My systems are older and the new SD card is new (16GB Class 4). Could this be that my computers are too old? Is there a definitive test to verify if my SD card is bad?

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• Turn off write barriers on ext4 whiche FS is mounted

  - by user462982

  I am doing some IO intensive DB imports that run for several days now and the IO performance has dropped tremendously over times. The DB data files (log files) are on an ext4 formatted logical volume which is mounted with default options (did not specify something special in fstab). Since I just learned that ext4 enables write barriers by default: Q: Is there some way to disable write barriers online (i.e. while the file system is in use), because I cannot interrupt the import and don't want to restart it again. I am aware that write barriers might not be the only thing impeding performance it is a bad idea to have write barriers disabled on journalling file systems if data safty is important (e.g. on a production system)

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• Application deployment with Puppet

  - by michaeltwofish

  I'm new to Puppet and while I've been using *nix systems for many years, I've never worked as a sysadmin or in ops. I'm currently writing Puppet manifests for hosting a set of (PHP/MySQL/MongoDB, code in git) web applications. Clearly Puppet needs to have some knowledge of the actual applications because I'll set up a virtual host for each one, but I'm not sure whether Puppet should be managing things like code deployment and database creation. Is Puppet an appropriate tool for application deployment? If not, can you recommend a more appropriate tool?

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• /etc/environment and cron

  - by clorz

  I've got two machines: Fedora and CentOS. And a cronjob 0-59 * * * * env > /home/me/env.log On CentOS I can see that /etc/environment is affecting the output while on Fedora it does not. I want Fedora to be like CentOS. What do I need to make it happen? /etc/pam.d/crond on Fedora auth sufficient pam_rootok.so auth required pam_env.so auth include system-auth account required pam_access.so account include system-auth session required pam_loginuid.so session include system-auth /etc/pam.d/crond on CentOS auth sufficient pam_env.so auth required pam_rootok.so auth include system-auth account required pam_access.so account include system-auth session required pam_loginuid.so session include system-auth /etc/security/pam_env.conf is the same on both systems and consists of commented out lines. Even if I make /etc/pam.d/cron.d files the same, problem still persists.

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• Why is only one domU giving me the "time went backwards"?

  - by Paul Tomblin

  I'm setting up a replacement server for one that was working ok but is having hardware issues. The original server is i686 (Pentium III), but the new one is amd64 (Xeon). Everything is working fine, except one of the three domUs is giving me the "clocksource/0: Time went backwards" error. The Debian Wiki says what to do if all your domUs are getting this error, but not what to do if only one of them has. The "tenants" on my domUs have done some messing about with the systems I configured for them. I don't know what the user of that particular domU might have done.

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• what poor management decsions have you had to deal with?

  - by tombull89

  As a junior technician I've had to deal with (or will have to deal with) some problems in the past and only being a junior technicain I don't have the confidence or respect from management staff to speak up. For instance, we're having a entirely new system. From Server 2003/XP going to Sevrer 2008 R2/Win7/VMWare/Digital Signage and the current amount of time dedicated to the training of the IT support department currently stands at 0. They seem to think that all it systems are the same and are going to get a bit of shock when I can't help them. I think there;s some UK legislation saying a school/business have to put money and time aside for training, but I'm not sure. What have you had to deal with?

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• mysql server, open 'dead' connections

  - by Jeff

  my basic question is what kind of impact does this have on the server.. lets say for example, there is an older program in my company that opens connections to a mysql database server at a high rate (everything they do with the application basically opens a server connections) however, this application was not designed in the way to dispose of the connections after they where created.. alot of the time the connections remain open but are never used again, open 'dead' connections i guess you could say. they just remain connected until the server times them out, or until an admin goes in and removes the sleeping connections manually. im guessing this could be responsible for sometimes not able to connect errors etc. that we receive from other systems that try to access the mysql database? (connections limit reached) could this slow down the server as well? curious what all this could exactly cause. thanks!

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• Best way to partition 1 TB (Linux and Windows 7)

  - by Simon

  Is there an intelligent way to partition 1 TB and be prepared for resizing/adding/deleting partitions? I was thinking about LVM, but as far as I remember, Windows 7 can't be installed on logical volume right? For now my plan is: - ~150 GB for Windows 7 and other stuff (Visual Studio..., maybe I'll split it 100/50 or something like that) - simple NTFS - 850 GB = LVM - disk for Linux (Ubuntu) and other stuff virtual machines, etc. I'm mostly interested in how and what tools should I use to get easy in maintain partitions for both systems.

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• Can I use Cygwin as a replacement for Ubuntu, for bash script testing?

  - by Jeroen De Meerleer

  Next wednesday i'm having an exam on Operating Systems. In this exam there will also be a part bash-scripting. The teacher itself will test the scripts in a Virtual Machine running Ubuntu. Myself, however, I'm having serious troubles with running the latest Ubuntu (14.04 LTS) on a Virtual Machine (there are troubles with gnome running very slow). So I'm thinking about using Cygwin, which is doing the job great for another course. The teacher already confirmed I can use that, but I'm thinking he doesn't know it at all. I've already tested the scripts we made in class and they're all running without errors. But I'm quite sure there are some things I have to mind on. My question: would you use Cygwin as a replacement for the Ubuntu VM? Or should I stick it with the VM (maybe by using a different config/platform).

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• Dependency diagramming / mapping tool [closed]

  - by Lars

  I am looking for a tool that allows me to easily create and maintain dependency maps of our mission critical servers, apps, processes, etc. It needs to be intuitive and easy to work with and be able to generate diagrams that clearly show the dependencies graphically. What would be some good tools for this? I have looked at videos for AssetGen Sysmap and BluePrint from Pathwaysystems.com, and they both seem to fit my needs, but there has got to be more good systems like them that I can look at. I want to make sure I pick the best system for our needs (and limited budget).

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• Debian can't see one of my hard drives

  - by nask00s

  Today I installed Linux Debian in dual boot with Windows 7. I have 3 hard drives, two for starage and one for the operating systems. The problem is with the two storage drives which are exactly same. In debian I can only see one of them. Before Debian I had Ubuntu and there wasn't any problem. Also I didn't changed anything from that drive. What should I do? I don't want to format it or delete anything.

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• What domain names are served by a host?

  - by pjmorse

  For a set of VPSes operated by my company, I'd like to get a list of domain names hosted by each. The list of names has grown in an ad-hoc way for a few years. Is there a simple way to query the Apache and/or Nginx configurations to see what domains the server answers to on port 80? It is safe to assume (a) that I have sudo on these systems, and (b) they aren't using wildcards, although a solution which acknowledged that a wildcard was in use would be useful too if it also provided a list of explicit domains.

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• xen 4.0 squeeze fails to start guests with: launch_vm: SETVCPUCONTEXT failed

  - by mcr

  As Chris Benninger says over at: http://www.benninger.ca/?p=58 lots and lots of people have the problem with Squeeze and xen4.0 telling them: launch_vm: SETVCPUCONTEXT failed (rc=-1) but nobody seems to know what the solution is. I don't know either, but at least here, a solution might get recorded. In my case, I can start one guest machine. An identical configuration for a second machine fails. Whichever one I start first, is the one that runs, the other gets the error. I've got at least a dozen other systems (at my work) running great with Squeeze and 64-bit XEN, but not this new machine at home.

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