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• Can a web server and XBMC HTPC co exist happily?

  - by Mild Fuzz

  I have a machine that is currently dedicated to running my home theatre. It is way more powerful than it needs to be, and spec wise would have no problem running both a few websites and an HTPC What I wanted to know is that is this was a reasonable thing to expect of a single machine? 90% of the time, all it's power would be just for the web server ( and the odd torrent) Currently it's running Windows, but I am pretty sure I will have to turn it into a Linux box Will I run into any problems? Is there anything I need to know before I start? Any prerequisites? The webserver will be required to run Ruby on Rails sites mainly, but might be called upon to run PHP for Wordpress also.

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• Preparing Automatic Repair appears out of nowhere & takes forever?

  - by Jörg B.

  I shutdown my work machine (Windows 8.1 Pro) without any errors appearing (and without installing any new software and especially no new drivers the last couple days) yesterday evening, turned it on this morning and it automatically started into 'Preparing Automatic Repair' mode. 1st of - is there any way to get more information WHY this is appearing out of the blue and.. 2ndly, how long is this usually supposed to take? This is a rather beefy machine (Intel 3770k / 4 core 3.9ghz, Intel SSDs only and 32 gb of ram) but this screen has been 'loading' for almost 1.5 hours now. Is there any sort of debug/verbose mode that would give me ANY indication what's going on?

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• Upgrade from 11.04 to 12.04 failed - unable to login

  - by Tobias M.

  Yesterday i updgraded from 10.04 to 12.04 via the update-manager. At the end it said "Failed to upgrade due to too many errors". Before that i got a lot of error messages that said packages could ne configured - they were all related to mono. Then it force me to restart. When booting now, I see the pink screen (without logo). After that it turns black and the cursor appears. Then its falshing around between beeing bright and dark and showing the cursor and not showing it. But no way i see the login-screen. At the moment i am not able to boot frm usb since my usb device is too large to be formated to FAT-32 (8GB). This all is happening on this machine: AMD E-350 Processor (2x1,65Ghz) 4GB DDR3 RAM 320GB SATA II Hard drive AMD® Radeon™ HD 6320 Thanks in advance to everyone who trys helping me ;) I have to continue working with data from this machine so i´d be pleased to get my data accessible. Greets ;)

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• Keyboard mapping issue in Virtualbox on Mac OS

  - by stanleyxu2005

  I run Windows 7 as a VM in VirtualBox on my MacBook Air (using OS X 10.7). If I do not shutdown the VM but save its machine state. The keyboard will behave strangely after resuming. It seems the Windows Logo key is always hold. When I type the key 'u', the Control Panel will be shown. I tested on a real Windows 7, the same dialog will be shown when I press Win-key and 'u'. When I type the key 'e', the Explorer will show up, some as press Win-key and 'e' on a real Windows 7. If I click 'Restart' from the Start menu of Windows 7, after restarting the VM, the keyboard works again. I think there are some conflicts with keyboard driver in VM. It is quite annoying, usually I usually close a VM by saving its machine state, not shut the OS down. Is there any way to solve this problem?

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• Mounting to external NFS from a KVM VM.

  - by jbfink

  I've got a machine acting as a KVM host and another machine that NFS exports to that KVM host. I'd like for one of the internal VMs on the KVM host to be able to mount the NFS share. I can export to the KVM host IP fine and do a mount, but it doesn't work for the internal VM; I just get a failed error with "reason given by server: Permission denied". I've already tried to re-export the NFS from host to VM, but apparently doing two levels of NFS is not a Good Idea. Anyone know how I might get this working?

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• How do I send email with sendmail to external hosts?

  - by Jake

  If I wanted to send an email to a user on the same linux machine, I can run: echo -e "Subject: Foo\n\nBar\n" | sendmail -v jacob But if I run: echo -e "Subject: Foo\n\nBar\n" | sendmail -v [email protected] It will give me the error: 050 >>> MAIL From:<jacob@mu> SIZE=321 050 550 5.1.8 Cannot resolve your domain {mx-us011} If my machine has access to the internet but is behind a router and has no domain associated with it, can I use sendmail to send mail to this address? Do I need to connect through an SMTP server? Can I do that with sendmail? If I use sendmail's -f option and put my gmail account there it will work. Can (or should I) I use my IP address? echo -e "Subject: Foo\n\nBar\n" | sendmail -v -f [email protected] [email protected] I'm a bit lost on how all this comes together in sending mail from the command line.

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• Is it still cheaper to build your own PC?

  - by Jeff Yates

  With many companies offering build-to-order PCs, where they can source components at bulk purchase prices, is there any value in building your own PC. Is it still a good option for everyone or is it only cost-effective for those building fringe equipment like high spec gaming platforms? Don't forget to factor in the time and effort you spend building and configuring the machine. I know that it is often worthwhile as it builds understanding of your machine, gets you exactly what you want, etc., but is it still good for your wallet or would you be better off paying someone else to do it and spend more time doing something else?

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• Can KVM CPU assignment count differ from physical hosts CPU count?

  - by javano

  I have read this question. I knew already that I could for example, have a quad core machine with four guests each having two vCPUs. As they don't all be require 100% CPU usage all the time, the scheduler would handle this for me. My question is about how this relates to a fail-over or migration situation; If host1 has two dual-core CPUs, and I assign guest1 four vCPUs (so it accessed all four physical cores), what will happen if I try and migrate it to host2 which only has one dual-core CPU? Can qemu-kvm emulate more vCPUs than there are physical? Or would I have to shut down the virtual machine, change the CPU assignment, migrate it, and then boot it back up (so no live migration)? Many thanks.

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• Standards for how developers work on their own workstations

  - by Jon Hopkins

  We've just come across one of those situations which occasionally comes up when a developer goes off sick for a few days mid-project. There were a few questions about whether he'd committed the latest version of his code or whether there was something more recent on his local machine we should be looking at, and we had a delivery to a customer pending so we couldn't wait for him to return. One of the other developers logged on as him to see and found a mess of workspaces, many seemingly of the same projects, with timestamps that made it unclear which one was "current" (he was prototyping some bits on versions of the project other than his "core" one). Obviously this is a pain in the neck, however the alternative (which would seem to be strict standards for how each developer works on their own machine to ensure that any other developer can pick things up with a minimum of effort) is likely to break many developers personal work flows and lead to inefficiency on an individual level. I'm not talking about standards for checked-in code, or even general development standards, I'm talking about how a developer works locally, a domain generally considered (in my experience) to be almost entirely under the developers own control. So how do you handle situations like this? Are the one of those things that just happens and you have to deal with, the price you pay for developers being allowed to work in the way that best suits them? Or do you ask developers to adhere to standards in this area - use of specific directories, naming standards, notes on a wiki or whatever? And if so what do your standards cover, how strict are they, how do you police them and so on? Or is there another solution I'm missing? [Assume for the sake of argument that the developer can not be contacted to talk through what he was doing here - even if he could knowing and describing which workspace is which from memory isn't going to be simple and flawless and sometimes people genuinely can't be contacted and I'd like a solution which covers all eventualities.]

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• How to Uninstall Internet Explorer 10 in Windows 8

  - by Taylor Gibb

  We previously explained why so many geeks hate Internet Explorer, and even though Internet Explorer 9 and 10 are greatly improved, and on par with the competition, we’re still going to explain how to uninstall it from Windows 8 if you should want to do so. Uninstalling Internet Explorer 10 Press the Win + R keyboard combination and type appwiz.cpl into the run box, then hit enter. When the Programs and Features window opens, you are going to want to click on the “Turn Windows features on or off” hyperlink on the left hand side. Next, find Internet Explore and uncheck it. You will then be given a warning, you can just click yes to continue. Now click on the OK button, and then reboot your machine. Once you machine has restarted, you will see that Internet Explorer is no longer in the taskbar You should also notice that the Metro version of Internet Explorer has also been removed. That’s all there is to it. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• Removing virus on Windows XP

  - by teepusink

  Hi, What is the best way to remove viruses from a Windows machine? Forgot to write down the message, but how I know there was a virus was because my wallpaper was changed to "You have been hacked" or something like that. I've tried reinstalling the OS several times but that doesn't seem to help. Somehow the virus still seems to be there. (i.e machine is slow and some unknown exe is always trying to access the internet). The exe name is something like ,,,,55786. Please enlight. Thanks, Tee

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• RAM caching causes severe performance drops

  - by B T

  I have read plenty of threads on memory caching and the standard response of "large cache is good, it shouldn't effect performance", "the kernel knows best". I have recently upgraded from 12.04 to 12.10 and changed from VirtualBox to VMware Workstation and the performance differences are severe (I suspect it is because of the latter). When I am running my virtual machine the system load monitor graph shows less than 50% memory usage generally. System load indicator is showing me that the rest of my RAM is used in the cache all the time. Plain and simple this is the comparison: BEFORE Cache was very sparingly used, pretty much none of my memory usage was the cache Swappiness was 0 (caused my memory to be used first, then swap only if needed) Performance was quite good and logical RAM was used fully first, caching was minimal. I could run enough software to utilize my full 4GB of RAM without any performance degradation whatsoever Swap space was then used as needed which was obviously slower (I am on a HDD) but was still usable when the current program was loaded into memory AFTER Cache is used to fill the full 4GB as soon as my virtual machine is run Swappiness is 0 (same behaviour as before but cache uses full memory straight away) Performance is terrible and unusable while running Ubuntu software Basic things like changing windows takes 2 minutes + Changing screens happens frame by frame over sometimes up to 5 minutes Cannot run an IDE and VM like I could with ease before So basically, any suggestions on how to take my performance back to how it was before while keeping my current setup? My suspicion is VMWare is the problem, but how do I see what is tied to the use of the cache? Surely there is a way to control this behaviour in software as polished as VMware? Thanks EDIT: Could also be important to note that the behaviour differs depending on whether VMware is open or closed. If VMware is open, then the ram will lock at like 50% and 50% cache and go into the complete lock up mentioned above. Contrastingly, if VMware is closed (after being open), then the RAM will continue to rise as it needs / cache will stay as the complete remaining memory and there is no noticeable performance degradation.

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• Recommended RAM and disc space for Oracle 11g on Windows

  - by Álvaro G. Vicario

  I need to provide the recommended amount of RAM and disc space (divided in two partitions) so the customer can create an appropriate virtual machine to run Oracle. All I could find in the documentation was a brief listing with minimum RAM and typical/advanced install types. The virtual machine will run latest Oracle Standard Edition One (11g release 2 so far) under Windows Server 2008 x64 and will host a reasonably low traffic web application. How much RAM and disc must I ask for in order to be safe? (Feel free to ask for further details if I've omitted something relevant.) Update: Rough estimations: Database size: 10 MB after installation Growth rate: +3MB per day on average Size of database 'active' data: (not sure of what this means, there's not actual archive so I guess all data is current) Amount of data written per second in peak hours: a few KB Number of client sessions: 3 or 4 at most Frequency and response size of most heavy requests: some reports make heavy table JOINS that need up to 20 seconds to complete but they won't return more than a few thousand rows with plain text. The app also handles BLOBs (typical size from 50KB to 200KB)

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• Changing linksys router configuration from command-line

  - by Dan

  I am constantly logged into (ssh'd) my home machine (ubuntu) from various remote locations. Sometimes I would like to change my home linksys router settings (change the port forwarding settings or disable/enable wireless, things like that). When I try and use the links2 text browser, there isn't much I can do because the tab titles don't show up (presumably because they are pictures?). Is there another way of configuring a linksys router from a command line? I guess my only other option is to set up a proxy on my home machine and use a browser connected to that proxy to configure it, but I would think there might be a non-browser way of doing it. Thanks

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• Hardware compatibility on H97 chipset/hardware support

  - by user3238850

  I am aware that there is documentation about compatibility but it is way out dated. I am also aware that there is a hardware compatibility page on Ubuntu website, but that one is focused on the whole box rather than a single piece of hardware. I have some experience with Linux OS, and some experience playing Ubuntu Server in a virtual machine, but never worked on a machine that lives in the real internet. I am building a home server with an Intel H97 chipset motherboard. I have looked at several models and none of them has Linux in the supported OS category. I have the experience of installing Ubuntu Desktop 14.04 on my 4-years-old lap top, and except for some system errors on start up, there is not too much I can complain about, so I guess I should be fine. However, this time I am going to install Ubuntu Server 14.04 on a relatively new piece of hardware(I went to http://linux-drivers.org/ but found nothing really helpful). For example the ASUS motherboard has M.2 socket and Intel LAN I218V chip, the Gigabyte motherboard has two LAN chips(Intel LAN WGI217V and ATHEROS AR8161-BL3A-R). So I really want to make sure everything will work. Usually I would just trust Ubuntu and buy all hardware I need, but basing on my past experience with the Ubuntu Desktop version on my lap top, I am not so convinced. There is an easily noticeable difference: when the system is idle, the fan runs much more frequently and longer under Ubuntu. This leads to my suspicion that generally hardware will have worse support for Ubuntu, which is no surprising at all but enough for me to put this post here. And as far as I know, some Intel CPU features come with software that usually will not run under Linux. Any help, idea or thoughts would be greatly appreciated!

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• kinit gives me a Kerberos ticket, but no AFS token

  - by Tomas Lycken

  I'm trying to setup access to my university's IT environment from my laptop running Ubuntu 12.04, by (mostly) following the IT-department's guides on AFS and Kerberos. I can get AFS working well enough so that I can navigate to my home folder (located in the nada.kth.se cell of AFS), and I can get Kerberos working well enough to forward tickets and authenticate me when I connect with ssh. However, I don't seem to get any AFS tokens locally, on my machine, so I can't just go to /afs/nada.kth.se/.../folder/file.txt on my machine and edit it. I can't even stand in /afs/nada.kth.se/.../folder and run ls without getting Permission denied errors. Why doesn't kinit -f [email protected] give me an AFS token? What do I need to do to get one?

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• Direct DB to Web Server connection

  - by Joel Coel

  I have a database server sitting right underneath a virtual machine host server in the rack, and this vm host is primarily responsible for servers hosting a couple different web sites and app servers that all talk to databases on the other server. Right now both servers are connected to the same switch, and I'm pretty happy with the pathing. However, both servers also have an unused network port. I wondering about the potential benefits of using a short crossover or normal+auto mdix network cable to connect these two servers together directly. Is this a good idea, or would I be doing something that won't show much benefit and is just likely to trip up a future admin who's not looking for this? The biggest weakness I can see right now is that this would likely require a code change for each vm app to point to the new IP of the database server on this private little network, and if I have a problem with the virtual machine host and have to spin up it's guests elsewhere while I fix it I'll have to change this back before things will work.

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• Bitlocker and SQL Server (2012)

  - by cdonner

  I just turned on Bitlocker on my development laptop for the first time (Windows 8.1) and encrypted both SSDs. When I started SQL Server Enterprise Manager, it could not connect to the default instance on the local machine. Does this not work? I have been googling for an hour and only found anecdotal evidence, but no solid information. Just to clarify - I am not interested in encrypting a database. I want to run SQL Server on a machine with an encrypted drive.

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• Why doesn't lsof show localhost TCP connections in 14.04?

  - by sfussenegger

  I have two servers running 12.04.4 and 14.04.1 respectively. Both have nginx (port 80) and a Java process (port 8080). As expected, the lsof output for the Java process on the 12.04 machine shows a couple of established connections for port 8080 (e.g. TCP 127.0.0.1:8080->127.0.0.1:58067 (ESTABLISHED)) The 14.04 machine however does not. It only shows the listening port (TCP *:8080 (LISTEN)). I'm sure there are active connections though (confirmed by access logs, Java process status output, etc). What has changed from 12.04 to result in this behavior? Can this change be the cause for the "Too many open files" errors I'm getting since moving from 12.04 to 14.04? 12.04: $ dpkg -l lsof linux-image-virtual openjdk-7-jre nginx ||/ Name Version +++-===========================================-=========================================== ii linux-image-virtual 3.2.0.59.70 ii lsof 4.81.dfsg.1-1build1 ii nginx 1.6.1-1~precise ii openjdk-7-jre 7u65-2.5.1-4ubuntu1~0.12.04.1 14.04: $ dpkg -l lsof linux-image-virtual openjdk-7-jre nginx-full ||/ Name Version Architecture Description +++-=====================================-=======================-======================= ii linux-image-virtual 3.13.0.32.38 amd64 ii lsof 4.86+dfsg-1ubuntu2 amd64 ii nginx-full 1.4.6-1ubuntu3 amd64 ii openjdk-7-jre:amd64 7u65-2.5.1-4ubuntu1~0.1 amd64

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• Teamviewer and Virtualbox issue: some keys don't work

  - by Barranka

  I use Teamviewer on a laptop to connect to a desktop computer running Debian Linux. On this desktop computer I run Windows inside a VirtualBox VM. I have no problems interacting directly with Linux, but when I try to interact with Windows inside Virtualbox, some keys simply don't work! (e.g. period, "@", quotes). Is there something I can do to make the full keyboard of my laptop work correctly with the Virtualbox VM inside the remote host? Specs: The remote host machine is an Intel i7 running Debian squeezy (64 bit) I'm using Teamviewer 7, on both the host machine and the laptop Thanks

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• Error starting Hyper-V VM

  - by Peter Bernier

  I'm trying to start a VM on a new Hyper-V installation and I'm receiving the following error: The virtual machine could not be started because the hypervisor is not running. The following actions may help you resolve the problem: 1) Verify that the processor of the physical computer has a supported version of hardware-assisted virtualization. 2) Verify that hardware-assisted virtualization and hardware-assisted data execution protection are enabled in the BIOS of the physical computer. (If you edit the BIOS to enable either setting, you must turn off the power to the physical computer and then turn it back on. Resetting the physical computer is not sufficient.) 3) If you have made changes to the Boot Configuration Data store, review these changes to ensure that the hypervisor is configured to launch automatically. My machine supports virtualization at the hardware level and it is enabled in BIOS. Why am I receiving this error?

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• how to disable isight auto adjustments ?

  - by George Profenza

  The built-in isight cam on my macbook machine keeps re-adjusting the lighting (and focus I think). I need to manually set those, but I found nothing of any use in System Preferences or System Profiler. Any way to access the settings ? Any magic terminal commands that allows access to the camera ? Anyone has a driver that allows for any camera access ? 'mac - it just works'...sure, if you want to use it like a kid. the second you actually want to do something with you mac other than the basic things, you can do on ANY regular machine anyway, your 'rights' are done with, as apple seems to only encourage dumb clients. I'm not saying saying this applies to all mac users, but the 'typical/average' one in my view is only going to use it for media(music,video) and web(facebook,blogging, all that) and maybe podcasting,webcasting,etc....ok this is turning into a rant, so I will finish here.

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• Are newly installed fonts in an email going to be displayed properly on another computer?

  - by Mehper C. Palavuzlar

  I have downloaded and installed a new font family (Gentium) on my machine. I want to use this font in some of my email correspondences. When I compose an email in Outlook 2007 with these fonts and send it to someone, is he going to be able to display it properly (I mean, with the same fonts, just the same as I can see the email)? I'm assuming the addressee doesn't have this font family installed on his machine. Does it matter if the addressee uses Outlook or a web-based email?

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• KVM switching on the cheap

  - by Stuart Hemming

  I have a machine at home for my personal use. I also have a machine for work. I have a pair of DVI monitors. An ideal set up for a KVM switch. Sadly the cheapest switch I can find that will switch 2 DVI monitors is nearly £300. However, I can get, for just £40, a switch for a single monitor. Is there any reason why I couldn't employ 2 of these much cheaper switches? My thought was to have the keyboard, mouse and one of the monitors in one switch and just the 2nd monitor in the 2nd switch. Logically, I can't think of a reason why this wouldn't work, but I have no real background to be able to say, definatively, whether or not it would. It it makes any difference, both machines are running Win7. Appreciate any thoughts. -- Stuart

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• What is the correct way to restart udev in Ubuntu?

  - by zerkms

  I've changed the name of my eth1 interface to eth0. How to ask udev now to re-read the config? service udev restart and udevadm control --reload-rules don't help. So is there any valid way except of rebooting? (yes, reboot helps with this issue) UPD: yes, I know I should prepend the commands with sudo, but either one I posted above changes nothing in ifconfig -a output: I still see eth1, not eth0. UPD 2: I just changed the NAME property of udev-rule line. Don't know any reason for this to be ineffective. There is no any error in executing of both commands I've posted above, but they just don't change actual interface name in ifconfig -a output. If I perform reboot - then interface name changes as expected. UPD 3: let I explain all the case better ;-) For development purposes I write some script that clones virtual machines (VirtualBox-driven) and pre-sets them up in some way. So I perform a command to clone VM, start it and as long as network interface MAC is changed - udev adds the second rule to network persistent rules. Right after machine is booted for the first time there are 2 rules: eth0, which does not exist, as long as it existed in the original VM image MAC eth1, which exists, but all the configuration in all files refers to eth0, so it is not that good for me So I with sed delete the line with eth0 (it is obsolete and useless in cloned image) and replace eth1 with eth0. So currently I have valid persistent rule, but there is still eth1 in /dev. The issue: I don't want to reboot the machine (it will take another time, which is not good thing on building-VM-stage) and just want to have my /dev rebuilt with some command so I have ready-to-use VM without any reboots.

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