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• Thin web server - single or multiple instances per IP address:port?

  - by wchrisjohnson

  I'm deploying a rack/sinatra/web socket app onto several servers and will use thin as the web server (http://code.macournoyer.com/thin/). There are almost no views to show, so I am not front-ending it with a traditional web server like Apache or nginx. In general, you see thin started and the underlying config file for it has the number of server instances to start, say 3, and the port to start with, say 5000. So, in my example, when thin starts, it starts up three instances on a range of ports, starting on port 5000. If I have a series of virtual machines, say 3, 6, 9, etc. that I treat as a cluster, would/should I choose to start a single thin instance on each VM, or multiple instances on each VM? Why? Thanks - Chris

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• cannot access my own computer through My Network Places

  - by WebMAOhist

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• I'm using a compatible active DisplayPort to DVI adapter with EyeFinity, why does my monitor still flicker?

  - by Christopher Galpin

  I specifically chose an active DisplayPort <- DVI adapter for use with EyeFinity right out of my graphic card vendor's list of confirmed compatible adapters. Yet the screen fails horribly, it blinks on and off constantly, sometimes the graphics go screwy and the appropriate resolutions won't be available. Sometimes the resolution will be available but I'll discover it's only with interlaced refresh rates and bounces up and down. I have to switch the resolution back and forth, again and again, to get it to work correctly, and then it fails again and the process must be repeated the moment the monitor is turned off or I reboot. It's maddening. What is wrong? Is my GFX card supplying insufficient voltage? (Firmware tweaks allegedly help some people, but my card's isn't modifiable.) Could the adapter be defective? Is it not "active" enough for my card and I need an expensive powered adapter? Is this endemic to DisplayPort in general?

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• Why can't I index a SUBST'd drive in Windows7?

  - by Andy

  I've got a SUBST for a folder to drive letter P: I have noticed that exploring these folders from P: is now INCREDIBLY slow, taking up to a minute sometimes to show files. I'm showing them as general files and not thumbnails, so it's not that. Looking at the original folder in explorer is lightning fast. I've checked the indexing options and indeed the folder where my files are stored is checked as indexed. I can see my P: drive in the list, but clicking on the checkbox won't do anything. It's not even checkable. Does anyone have any clues as to how I can fix this? (Running Windows 7 just to be clear).

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• Problem with screen redrawing at DOS app in VmWare Player

  - by MicTech

  I have very old DOS Application (CadSoft Eagle - PCB Designer) and I want to work with it on my workstation with Windows 7. Then I install Windows 98 and that software into VmWare Player. But that software has serious problem with redrawing screen. It's very slow in comparison with my Intel Celeron 333MHz with Windows 98. I have same problem if I try to use DOSBox on Windows XP (same Celeron 333MHz). I also trying run this application directly on Windows XP (same Celeron 333MHz) with compatibility mod set to "Windows 98", but I get "(0Dh): General Protection Fault". Can someone give me good advice how I solve that?

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• When using RAID10 + BBWC why is it better to separate PostgreSQL data files from OS and transaction logs than to keep them all on the same array?

  - by Vlad

  I've seen the advice everywhere (including here and here): keep your OS partition, DB data files and DB transaction logs on separate discs/arrays. The general recommendation is to use RAID1 for OS, RAID10 for data (or RAID5 if load is very read-biased) and RAID1 for transaction logs. However, considering that you will need at least 6 or 8 drives to build this setup, wouldn't a RAID10 over 6-8 drives with BBWC perform better? What if the drives are SSDs? I'm talking here about internal server drives, not SAN.

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• Does using VLANs in your network infrastructure cause an appreciable decrease in performance?

  - by Peter Grace

  This is something I've never considered before and wanted the opinions of the experts. We use VLANs day in and day out for various network tasks. My modus operandi is that in general, if something supports VLANs, that port is getting trunked because it just makes a ton of sense if there's even the slightest chance you need to do more than one thing on that single link. As I ponder this, though, I'm wondering whether there's a performance penalty involved with this line of thinking? Is the impact negligible?

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• Private Git repo using Smart HTTP with LDAP authentification

  - by ALOToverflow

  I've been crawling the interwebz and getting my hands dirty for the last few days, but I can't seem to make it all work together. I managed to get a HTTP repo working with Ubuntu 10.04 over Smart HTTP (pull and push over HTTP) for a single repo. This means that I do the initial setup over SSH to the server (git init --bare) and after that the clients can pull and push to it (git clone http://servername/allgitrepos/repo.git). Unfortunately it's impossible to add a new repo without SSHing to the server and adding it manually) i.e. git push http://servername/allgitrepos/repo2.git (allgitrepos is available for everyone to read-write and execute) would fail talking about git update-server-info (which seems to be a general error message). So far the repository is anonymous, so I would like to authenticate using LDAP and also use the LDAP creds to make the git commit. So, how can I push new repos to the server and how can I use the LDAP creds to make the git commit. Thanks

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• Excel 2010 started changing my numbers

  - by Going Crazy

  If I type in a 16 digit number (format: number, no decimals) it changes the number on me. Example: 1234567812345678 changes the view to 1234567812345670. If I type it in as a general format it changes the numbers above so it displays 1.23457E+15 but if you click on the cell, the display shows the last digit as a 0 instead of an 8 once again. I opened the file on a different computer and same issue now with it. I have changed the auto correcting and auto formating all to no avail. Help!

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• Can't execute java files on command prompts when they work perfectly in Eclipse IDE, what to do?

  - by Eduardo de Luna

  I run the following code in Eclipse IDE: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!" ) ; } } And it renders the expected output. When getting into the command prompt (DOS) already in the directory, I type this javac HelloWorld.java And then this java HelloWorld And the output reads Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld <wrong name:learning/HelloWorld> With a whole lot more errors, learning being the name of my general package. What's wrong? I have installed Eclipse x86 SDK 4.2.0 together bit with the latest JRE and JDK both in 64 bit as well.

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• A space-efficient guest filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• Run command before and after printing with CUPS?

  - by leto

  Hello, this is a home setup. A central printer server (Linux) manages the queue, a HP 2430DTN is attached to it via 100Mbit/sec Ethernet. The printer is hooked up to a managable power source. A shell script watches the queue on the server (lpstat -o) and turn on the printer when there is a job. If the queue is empty for 10 minutes it turns the printer off. Now this setup messes up, stops the printer etc. after a couple of weeks and is in general "not so reliable". I now know how to change the stop-printer thing, but: Is there a way to run my turn printer on script and turn printer off script directly from cups without watching the queue? That would be so cool!

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• Hide Win 8.1 "tip" about "Switch between apps"?

  - by Carl R

  I've just installed Win8.1 and I'm trying to set up IIS. When I open Add remove programs from the start menu I get the pc-settings app. In the pc-settings app I get a "tooltip" or whatever we should call it, that hints me to "Switch between apps" by swiping from the edge. Well fine, but I don't want to do that right now, and I can't get that tip to dissapear. The tip lingers on even into Visual Studio, covering my code. I can't swipe because I don't have a touch screen, and also I'm on a multimonitor system that shows this tip in the middle of the screen. Here's a screenshot for you, where I put the web browser slightly over the left monitor. So, besides rebooting, how am I supposed to kill this very informative tip? EDIT When I kill the app by alt-f4 it dissapears right until I open the settings app again, then it's back. What I'm asking about is how to dismiss items like this in general.

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• Running projects from NTFS partition on Ubuntu

  - by tsuby

  I'm dual booting Windows 7/Ubuntu 12.04. I want to run C++/Java projects from a NTFS partition, where I keep generally all my files and projects. I fiddled with the fstab. One time I removed 'noexec', the other I changed it to 'exec'. After that,each time, I remounted the partition and it still didn't work. I tried using sudo mount -o remount,exec /media/mypartition It didn't work either. There was a somewhat similar question already, but it didn't have the proper answer for me or I didn't know how to make it work(note: I am a total newbie with Ubuntu and Linux in general).

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• Distribute Nagios to reduce false alarms

  - by GDR

  I'm currently running a single Nagios instance. From time to time, I'm getting false alarms about timeouts - for example, it says that HTTP is down on some server, but when I open it in my browser several seconds later, it loads fast, and in general there is no trace of an error. What can I do to reduce such false alarms? I'm guessing that it's because of transient network issues on my monitoring server. I guess that setting up another monitoring server on a different network would greatly help, but how do I plug it into Nagios? Is it at all possible with Nagios or do I have to switch to another monitoring system? I like my configs and, if possible, I'd like to stay with Nagios or something compatible (Icinga?)

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• Hard Drive upgrade advice for a Dell PowerEdge 1950

  - by user8185

  My setup is a Dell PowerEdge 1950 with 2x 140Gb Hard drives in a RAID 1 configuration. The OS is Windows 2003 Web Edition and disk is partitioned into to two, a 12Gb C: partition and the remainder is the D: drive. Both are very close to full capacity. Ideally I want to replace those drives with 2x 1Tb drives while retaining all data. First of all is this possible without rebuilding the server? If so, will I need any 3rd party software, Symantec Ghost, Partition Master for e.g., to do this? Any general advice as to how to go about doing this?

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• Access Denied Error in PagesListCPVEventReceiver post SharePoint SP2 upgrade

  - by Jeff

  I am seeing the following errors from one of the SharePoint Web Front Ends after the SP2 upgrade. Has anyone else seen this error or a solution? Event Type: Error Event Source: Windows SharePoint Services 3 Event Category: General Event ID: 6875 Date: 2009-10-27 Time: 13:09:57 User: N/A Computer: XXXXXXX Description: Error loading and running event receiver Microsoft.SharePoint.Publishing.PagesListCPVEventReceiver in Microsoft.SharePoint.Publishing, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c. Additional information is below. : Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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• Looking for temporal upsampling / motion interpolation software

  - by timday

  I'm looking for something (prereably FOSS software) which can take an animation with N images as input, and which will output an animation with M frames, where M is in the range 2N to 5N or so. I believe the general technique is called "temporal upsampling" or possibly "inbetweening" (or "'tweening" for short). Note that it does need to make some effort to do motion tracking of things in the scene ("optical flow"); just fading ("dissolve") between keyframes isn't going to cut it. Googling "temporal upsampling" turns up any number of papers on the subject, but I've yet to discover any code/software (a gstreamer plugin would be perfect) I can just use to try the technique out. Any suggestions ? Additional information: "Motion interpolation" seems to be the more widely used name in the TV world for what I'm looking for. See this and the video here too. Interestingly, some cinephiles seem to hate what these technologies do to 24FPS film: e.g a comment "makes Gone With The Wind look like a soap opera shot on video".

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• Nginx vs Apache as reverse proxy, which one to choose

  - by mhd

  Hi, this kind of question maybe has been asked here but I couldn't find any that really match my question. Heard that nginx performance is quite impressive, but Apache has more docs, community(read:expert) to get help Now what I want to know, how both web servers compare in term of performance, easiness of config, level of customization,etc. AS REVERSE PROXY server in a vps environment?? I'm still weighing between the two for a ruby web app(not ROR) served with thin server. Specific answer will be much appreciated. General answer not touching the ruby part is okay. I'm still noob in web server administration.

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• How can I evaluate the best choice of archive format for compressing files?

  - by Mehrdad

  In general, I've observed the following: Linux-y files or tools use bzip2 or gzip for distributing archives Windows-y files or tools use ZIP for distributing archives Many people use 7-Zip for creating and distributing their own archives Questions: What are the advantages and disadvantages of these formats, all of which appear to be open formats? When/why should I choose one (say, 7-Zip) over another (say, ZIP)? Why does the trend above appear to hold, even though all of these are portable formats? Are there any particular advantages to using a particular archive format on a particular platform?

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• Is there a cheaper alternative to Skype for VoIP to PSTN calls to Vietnam?

  - by Nick Bolton

  My dad uses Skype to make calls to Vietnam PSTN, but finds that the rates are a little on the pricey side. It's probably not relevant, but he's living in Thailand right now. Is there an application similar to Skype, which is cheaper for calling Vietnam? The answer may well be no, since maybe the international telecom peers in Vietnam are just generally expensive... Who knows? While I'm asking, maybe it's worth someone mentioning if there's a cheaper alternative to Skype in general? I'm thinking that maybe not as Skype's pretty cheap anyway, but it's worth mentioning.

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• Windows 7 Natively on Mac OS X Bootcamp, Airport Wifi Unable To Connect

  - by Goober

  I am using a brand new MacBook Pro. I am running a copy of Windows 7 natively via bootcamp (No use of Virtual Machine Software at all). However the only way I can get Windows to connect to the internet is via ethernet, as opposed to the Macs Airport card picking up the wireless. It just refuses to connect, and gives me a limited access status. Any ideas!? I've run Windows XP natively via bootcamp and I had a few issues with the network constantly dropping out, however I blamed that on the drivers and the general shiteness of XP.... Help greatly appreciated.

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• How to remove a package I compiled and installed manually?

  - by macek

  I recently compiled and installed Git on a new install of Mac OS 10.6 but it didn't install the documentation. I now realize I should've used the precompiled package offered here: http://code.google.com/p/git-osx-installer/downloads/list How do I remove all the files that I added to my system using make install with the Git source code? Edit: I've had similar problems in the past with other packages, too. For example, ./configure with the incorrect --prefix= or something. What's the general practice for removing unix packages?

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• How to lie to Win98 about USB drivers?

  - by BCS

  I have a new printer and a old (Windows 98) system (that can't be upgraded). I've been told that some of the drivers for older printers of the same make are very likely to work just fine for it if I can talk windows into using them. Is there a way to edit the map of device IDs (VID/PID?) to USB drivers? The specific kind of tool I'm looking for should work for any kind of USB drivers, not just printers. OTOH if someone knows of a technique that work for some kinds of printers, that could be of (general) interest.

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• Set 802.1Q tagged port on VLAN1 on Dell PowerConnect switch

  - by Javier

  I'm having big troubles when adding this Dell switch to my network. Here we use several VLANs to segment traffic. All switches (3com and DLink mostly) have configured the same VLANs, most ports are 'untagged' and belong to a single VLAN, except for the ports used to join together the switches (in a star topology), these ports belong to all VLANs and use 802.1Q tags. So far, it works really well. But on this new switch (a Dell PowerConnect 5448), the settings are very different (and confusing). I have configured the same VLANs, an the uplink ports are set in 'general' mode (supposed to be fully 802.1Q compliant), I can set the VLAN membership as 'T' on these ports for all VLANs except VLAN 1. It always stay as 'U' on VLAN 1. Any ideas?

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