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• Node.js server crashes , Database operations halfway?

  - by Ranadeep

  I have a node.js app with mongodb backend going to production in a week and i have few doubts on how to handle app crashes and restart . Say i have a simple route /followUser in which i have 2 database operations /followUser ----->Update User1 Document.followers = User2 ----->Update User2 Document.followers = User1 ----->Some other mongodb(via mongoose)operation What happens if there is a server crash(due to power failure or maybe the remote mongodb server is down ) like this scenario : ----->Update User1 Document.followers = User2 SERVER CRASHED , FOREVER RESTARTS NODE What happens to these operations below ? The system is now in inconsistent state and i may have error everytime i ask for User2 followers ----->Update User2 Document.followers = User1 ----->Some other mongodb(via mongoose)operation Also please recommend good logging and restart/monitor modules for apps running in linux

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• How can I specify nameserver's port number in osx? [duplicate]

  - by Cofyc

  This question already has an answer here: How is DNS lookup configured for OSX Mountain Lion? 2 answers In resolver manual, it said: The address may optionally have a trailing dot followed by a port number. For example, 10.0.0.17.55 specifies that the nameserver at 10.0.0.17 uses port 55. But it doesn't work, in /etc/resolv.conf or files under /etc/resolver/. 208.67.222.222.5353 Can I specify non-default port number for nameserver in osx? Update: osx don't use /etc/resolve.conf, but use files under /etc/resolver/. I have wrote a file dev with content '127.0.0.1' to route all dns queries for *.dev domains to a local dns server (127.0.0.). But I cannot specify dns server's port here. (It uses 53 anyway) Maybe there is no way to specify port number under osx?

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• How does java permgen relate to code size

  - by brad

  I've been reading a lot about java memory management, garbage collecting et al and I'm trying to find the best settings for my limited memory (1.7g on a small ec2 instance) I'm wondering if there is a direct correlation between my code size and the permgen setting. According to sun: The permanent generation is special because it holds data needed by the virtual machine to describe objects that do not have an equivalence at the Java language level. For example objects describing classes and methods are stored in the permanent generation. To me this means that it's literally storing my class def'ns etc... Does this mean there is a direct correlation between my compiled code size and the permgen I should be setting? My whole app is about 40mb and i noticed we're using 256mb permgen. I'm thinking maybe we're using memory that could be better allocated to dynamic code like object instances etc...

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• Keyboard shortcuts to control WinAmp

  - by Kip

  Some keyboards have a play/pause button built into the keyboard. I don't have one of those, but I'd like to set up a keyboard shortcut to do the same thing. I'd like the shortcut to work no matter what application has the focus. Is there a way to configure this in WinXP? Also, I'm using an old version of WinAmp (2.95). I'm not sure if that matters, as I thought these keyboard buttons worked universally somehow (but maybe I'm wrong?).

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• How to establish the real-time communication between Shopping cart running MySQL and Internal System Running PostgreSQL [closed]

  - by Andrew

  I am thinking about the way of establishing some-sort of real-time connection between MySQLpowered shopping cart and internal system that is running on PostgreSQL. Could you give me some sort of insight on this topic? For example, I can write some sort of csv export application, then enable remote MySQL for over the internet connection and then import csv to mysql directly from PC. Or upload csv and run cron on server. But this way of import-export causing delays; so I would like to link databased (or some msort). I have never done it before and would like to hear some opinions about this. Another way "just a thought" might to implement triggers that would initiate the update process via csv; but again, I would like to avoid csv. Do you have any good advise? Maybe some specific examples?

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• Wireless Repeating with two Netgear N750 (WNDR4300)

  - by jomo1911

  I have a Netgear N750 as my main router, which connects to the internet via a modem. I have a second Netgear N750 which I want to use to repeat the wireless signal of the main router. I logged in to routerlogin of my main router (192.168.1.1) and set up the "Wireless Repeating Function". I set it as the "Wireless Base Station" and filled in the MAC adress of my second Netgear N750. Then I logged in to routerlogin of my second router and set it up as the "Wireless Repeater", I gave it the IP 192.168.1.11 and filled in the MAC adress of the base station. During the setup of the second router (Repeater) I had to disable all security functions. If I connect to the repeaters' WLAN signal, I get no internet connection. Maybe you can help me, thanks

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• Premature end of script headers

  - by Tony

  I often get a "premature end of script headers" error in my apache log which results to an internal 500 error. I understand what the error message means - that my application did not give the browser the headers it needs (and maybe nothing at all), but the odd thing is that this does not happen all the time. It actually usually happens the first few times I go to my website after a deploy. Could this be a memory issue? Does anyone know how to trouble shoot this? My apache log isn't really telling me anything. I am running a ruby site using the rails framework on ubuntu hardy. thank you!

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• file-name encoding problems

  - by tenhouse

  I googled over this topic but couldn't find what I was looking for... the following "happend" to me: I had my files stored on a NTFS-USB Harddisk, because of space problems I moved them to an ext3 system....somehow the filename (content is still ok as far as I saw) encoding screwed up....my files look like the following now: Kküken <--- should have an "ü" Jäger <--- should be an "ä" Zwölf <--- should be an "ö" fünfte <-- should be an "ü" etc .... These are just examples, but already give me my first question Why has the "ü" two different representations? (Maybe I screw up, before I screw up and now I have a mixing of x different encoding-layers? :) ) I tried the following command: convmv -r -f UTF-8 -t ISO-8859-1 * This command work for some files (for example Zwölf) but not for all: iso-8859-1 doesn't cover all needed characters for: "fünfte" So Iguess it must be another encoding - but which? How can I find out this? And is there any way that I can still fix all of this?

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• Why isn't sox able to convert to mp3?

  - by marue

  I installed Sox, i installed lame-398, but sox is not able to convert any file to mp3. It fails with the messages: ./../sox FAIL util: Unable to load LAME encoder library (libmp3lame). ./../sox FAIL formats: can't open output file `funktech.mp3': How can i check if lame has been installed correct? How can i get sox to find the mp3Library? edit: I did not install sox at all, it works without installing directly from the commandline. Lame was installed by following the instructions on their site: ./configure make make install which results in the following files being found in /usr/local/lib/ : libmp3lame.dylib, libmp3lame.la, libmp3lame.a Maybe symlinking libmp3lame.la, which is marked as executable, to /usr/bin would help?

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• OSX Keyboard Shortcuts in Dialogs?

  - by Dan Fabulich

  On Windows, every dialog box includes underlined letters that you can activate using the Alt key. I use these "Alt" keyboard shortcuts all the time; I'm missing them as I'm trying to switch to OSX. On OSX, all I can find is Tab navigation, which requires you to press Tab seven or eight times to get anywhere in most dialog boxes. (And even that is hidden by default: you have to enable "Full keyboard access" in the "Keyboard & Mouse" control panel to be able to Tab between buttons.) Is there some way I can get something like the Windows Alt accelerators for OSX dialogs? I'm willing to write Automator code, download/purchase software, etc. Specifically, I'm imagining maybe something where you do some shortcut command and then start typing the name of the button, and hit Enter to push the button...?

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• Can I monitor active user count on my iis sites?

  - by Dejan.S

  We are having problems with performance on our server that host our websites that the processor gets upp to 90%. I would like to monitor the amount of users active on your sites that are published on the iis. My question, is this possible? is there any software for this? EDIT current (like this second) visitor count on all the active websites on our iis REASON FOR THIS if i can get the visitor amount on the days the CPU is not overloaded and and compare it to the days it is then i atleast know that this CAN be a reason why this is happening and i can take it from there. Otherwise i can focus on the code on the sites, or maybe google crawler is causing this, there are manythings that can cause this you know? for me this is just a simple way of troubleshooting.

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• Best practice for system clock sync on KVM host

  - by Tauren

  I have an Ubuntu 9.10 server running as a KVM host with ntpd installed on it. The host system has the correct system time. At the moment I only have a single KVM guest, also Ubuntu 9.10 server. I do not have ntpd installed on it, and I just discovered the clock is about 6 minutes slow. It wasn't that way when it was installed about a month ago. I thought that I only needed to keep the host clock synchronized and that the guests used the host clock. But maybe that is a memory from using OpenVZ. I believe the reasoning was related to only the host could modify the physical system clock. Is running ntpd on both the host and all the guests the correct thing to do? Or is there something else that is preferred? How should I keep the guest clocks in sync?

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• Asp.net hashing (using codesmith) when upgrading from .net 2.0 to 3.5

  - by user34505

  Hi, I'm administrating servers running IIS 6, hosting a website on ASP.NET 2.0. Yesterday I installed .Net framework 3.5, and all my user authentication system was lost. Users can't log in, because their password arn't getting authenticated, maybe because the hash function has changed in 3.5??? I can't really get to the code, but I know it uses an extention called CodeSmith. Do you know of any break my upgrade the 3.5 ugrade could couse? Please help. Thanks.

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• Experience with HAVP

  - by Kyle Brandt

  I have employees that have to search sketchy virus-ridden websites as part of their job. They all have XP and Symantec AV installed but they still get hit fairly often. Rather then trying all sorts of desktop level solutions, I was thinking about maybe some sort of Proxy in addition to symantec for when they browse these sites? Anyone have experience with HAVP? Am I going about this the wrong way? If this is the right way, and free alternatives to HAVP?

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• I need something substantial to do [on hold]

  - by Christian Delapena

  I'm a 19 year old computer geek who was recently exposed to Linux. I know quite a bit of it now and would like to do something substantial with it. I've visited websites like openhatch where you can get started on opensource projects but I'm more interested in something Linux-specific like hosting a website or tracking some important operation. Maybe running a script that will give me data on something important. I don't know. I'm essentially bored and I want to put my knowledge and love of Linux to good use. Someone please point me in the right direction.

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• Task Manager: VM Size smaller than Mem usage?

  - by shoosh

  The windows XP tasks manager can show two different columns regarding the memory usage of the processes. One is called Mem Usage and the other is VM Size (not on by default, you need to activate it) From what I've gathered, VM size is the size of the entire memory space occupied by the process and Mem Usage is the amount of memory currently committed and used. This assumption is verified by most processes when the VM Size is only slightly larger than Mem Usage for instance my Outlook currently has 79,724 K in VM Size and 56,600 K in Mem Usage But it fails for other processes such as Firefox which currently has 171,900 K for Mem Usage and only 156,440 K in VM Size. How can a process use more memory than the amount of virtual memory allocated to it? So Maybe my interpretation of these columns is wrong. What do they actually mean?

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• Excel - Filling images using a reference image

  - by tjans

  I have a spreadsheet that I use to create baseball cards for a tabletop baseball game. There are about 20 cards on my sheet, and I'd like to add a spot where I can set the logo and have it reflect that logo in each card without having to update 20 different images each time I create cards for a new team (and thus, a new logo). Is there a way to automate this process similar to setting one cell equal to the value of another (=A4, for instance)? I think the images aren't part of a cell and they float on top of the sheet, but I had hoped there was a way either with a macro or other VBA function (or maybe something built-in) that would accomplish this.

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• Almost 2013 - Any decent options for mp3 to text? (Speech Recognition)

  - by ajacian81

  I know there's some questions here on s/u regarding converting spoken word mp3 to text, however, most are pretty old (2010 and earlier). I'm just wondering if there's any new legitimate options for this task - if google has shown us anything, speech recognition has come a long way. Personally, I'd prefer a linux based solution, but I'm not picky. I've heard a lot about something called Sphinx, but I tried to set it up and get it going but I couldn't. I know there's a number of different componenents for Sphinx so maybe I was doing it wrong? Either way, are there any new applications for Speech recognition, especially from MP3 files? Thanks!

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• Force Colloquy not to use built-in Growl notifications

  - by thepurplepixel

  Whenever Colloquy needs to pop up a notification (for example, when you are PM'd), it uses its built-in Growl notifications, which really annoy me because they stay on the screen until they are clicked (at least NOTICE's do anyways). I'd like to make Colloquy use the Growl that I have installed on my Mac, not its built-in Growl notifications. That way, I could change its preferences from the Growl .prefpane and it would match the look of all my other notifications. I seem to remember this being possible (maybe in a bug report or something), but I can't remember how. Thanks!

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• CPU fan making noise

  - by superb1

  CPU fan is making noise. I figured out some reasons: Cable coming out of fan is vibrating. And maybe also CPU fan is loose causing vibration. Suggest options. I cleaned the fan. But found that there is no heatsink compound /paste between processor and the fan. Is it OK? My processor is P4 2.4 GHz. Motherboard Intel 845 GVSR.

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• How do i get a more recent version of Java on my Mac than is showing up in software update?

  - by Bec

  I need at least Java 1.6 to run a program that someone else in my lab wrote On the Java website it tells me to update Java via apple's software update function, i've run this a few times but it only got up to Java 1.5.0_24 and it now says no more updates are available for my computer Is there another way to update Java on a Mac? Is my operating system maybe to old for Java 1.6? i'm not sure what i'm running exactly, and i can't find a list of what mac operating systems run what versions of Java because the java site just suggests using Mac's software update.

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• website not accessible with IIS6 while NAT is configured in Windows 2003

  - by Mohammed Rizwan

  I have Windows2003 server configured with IIS 6. Until now it was working fine, but since I enabled NAT for my users to access the internet via this server, the website becomes unavailable. Note that I have two nics on the server one is WAN and 2nd is for LAN. Both IPs are behind the firewall. If I stop the NAT then the website is available externally. I tried to search the answer in this forum but didn't find appropriate one or maybe didn't properly understand. I'll appreciate if anyone can help me sorting out this issue.

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• Hiding some users in the user list of the OSX 10.6 login panel

  - by Lohoris

  Is there a way to show only some users in the login panel? I'm using OSX 10.6, and if I recall correctly I did something like that in a distant past but I really can't find out how. In the system preferences there seem to be nothing like that (neither in Accounts nor in Security, for instance), and Tinkertool does not do that. Google didn't help. edit: I hoped there was a graphical solution, such as while hiding them from the first screen, having also a button like "show all". I guess there isn't or somebody would have answered. Maybe I'll just change the usernames adding leading Z at the start of the usernames of the ones to "hide", so they'll appear lower in the list... :/

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• Flushing disk cache for performance benchmarks?

  - by Ido Hadanny

  I'm doing some performance benchmark on some heavy SQL script running on postgres 8.4 on a ubuntu box (natty). I'm experiencing some pretty un-stable performance, even though I'm supposed to be the only one running on the machine (the same script on the exact same data might run in 20m and then 40m for no specific reason). So, remembering my distant DBA training, I decided I should flush the postgres cache, using sudo /etc/init.d/postgresql restart, but it's still shaky! My question: maybe I'm missing some caches in my disk/os? I'm using a netapp appliance as my storage. Am I on the right track? Do I even want to make sure I get repeatable performance before I start tuning?

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• Which app has a notification sound with 3 descending notes?

  - by Eric

  Brand new Windows 7 box loaded with the usual dev tools -- VS2008, Firefox, Chatzilla, Thunderbird, emacs, Pidgin, Putty, iTunes, SharpReader. Every couple of minutes, I get an audio notification consisting of three rising notes, maybe a middle-C-G-F on a piano (I don't have a piano handy, and don't have time to use GarageBand to try to figure it out). Nothing in the notification bar is flashing when this happens. The sound isn't in any of the Windows Sound control panel applets. And it's not in C:\Windows\Media, so it's most likely coming from a non-Microsoft app. Any chance it's Pidgin when the status one of my contact's changes (which happens plenty frequently)? Oh, look at this --- Tools/Mute Sounds. Let's try that and see what happens... Is this familiar to anyone?

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