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• Need an alerting system if my cloning script fails

  - by rahum

  I've configured a nightly rsync to mirror one server to a standby offsite backup server. The total datastore on the primary is 1.5TB. In the course of getting this working, I ran into numerous instabilities with the environment, which I seem to have sorted out, but even though it's now working, I am still nervous. This is intended to be a disaster-scenario standby server, and if disaster strikes and the standby does not have all the proper data synchronized, I'm out of a job. Thus, I want to script a system that will confirm, after each nightly sync, that the destination data matches the source. I realize that rsync does this, but if rsync doesn't complete fully (which was happening during the setup troubleshooting), I need to know. Any suggestions? I'm best with Ruby, if that is relevant for the solution.

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• Can a named (bind) crash make a server unreachable?

  - by giorgio79

  My server recently became unreachable, and after restart a named error was the last line I found in /var/log/messages before restart: Jun 26 00:15:06 host named[1303]: error (network unreachable) resolving 'dlv.isc.org/DNSKEY/IN': 2001:500:71::29#53 Jun 26 06:38:55 host kernel: imklog 5.8.10, log source = /proc/kmsg started. Jun 26 06:38:55 host rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="1294" x-info="http://www.rsyslog.com"] start Jun 26 06:38:55 host kernel: Initializing cgroup subsys cpuset Can a named crash make a server unreachable? I doubt it, as I assume I should still be able to login with ssh via IP, but the server did not respond...So, I am trying to make heavy guesses here.

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• proxy software that supports parallel transfer

  - by est

  Hi guys, I need to setup a really fast proxy server in a remote server, here's the scenario: The server prefetches 3KB of data, mostly HTTP resources. The server send to client 3KB of data, instead of traditional HTTP or SOCKS proxy, the server open multithreaded transfer with 3 connections, send 1KB of data per thread to each connection The client receives 1KBx3, and combine them to the original 3KB data, and return as a local HTTP proxy server. The client display the original data in browser via the local HTTP proxy The latency is not important as long as the transfer rate is good. Does any software like this exist? It's better if it's open source or free ones.

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• Iptables NAT logging

  - by Gerard

  I have a box setup as a router using Iptables (masquerade), logging all network traffic. The problem: Connections from LAN IPs to WAN show fine, i.e. SRC=192.168.32.10 - DST=60.242.67.190 but for traffic coming from WAN to LAN it will show the WAN IP as the source, but the routers IP as the destination, then the router - LAN IP. I.e. SRC=60.242.67.190 - DST=192.168.32.199 SRC=192.168.32.199(router) - DST=192.168.32.10 How do I configure it so that it logs the conversations correctly? SRC=192.168.32.10 - DST=60.242.67.190 SRC=60.242.67.190 DST=192.168.32.10 Any help appreciated, cheers

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• How can I troubleshoot SSD disconnection problems on Windows 7?

  - by 0xC0000022L

  I have a small SSD (Transcend StoreJet TS256GESD200K) which I am using on several computers. The drive is formatted with NTFS and recently I started noticing disconnects. Normally one probably wouldn't notice (you don't even get the notification sound in Windows when it disconnects), but since I use USBDLM and run a VM from that SSD, I get to see this first-hand. How could I best figure out whether the problem is the hardware (SSD, USB socket, USB cable or something in the PC) or software? In short: how can I locate the source of the disruption so that I can work on removing the problem? Side-note: SMART status for the SSD is clean.

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• Unit testing to prove balanced tree

  - by Darrel Hoffman

  I've just built a self-balancing tree (red-black) in Java (language should be irrelevant for this question though), and I'm trying to come up with a good means of testing that it's properly balanced. I've tested all the basic tree operations, but I can't think of a way to test that it is indeed well and truly balanced. I've tried inserting a large dictionary of words, both pre-sorted and un-sorted. With a balanced tree, those should take roughly the same amount of time, but an unbalanced tree would take significantly longer on the already-sorted list. But I don't know how to go about testing for that in any reasonable, reproducible way. (I've tried doing millisecond tests on these, but there's no noticeable difference - probably because my source data is too small.) Is there a better way to be sure that the tree is really balanced? Say, by looking at the tree after it's created and seeing how deep it goes? (That is, without modifying the tree itself by adding a depth field to each node, which is just wasteful if you don't need it for anything other than testing.)

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• Java enum pairs / "subenum" or what exactly?

  - by vemalsar

  I have an RPG-style Item class and I stored the type of the item in enum (itemType.sword). I want to store subtype too (itemSubtype.long), but I want to express the relation between two data type (sword can be long, short etc. but shield can't be long or short, only round, tower etc). I know this is wrong source code but similar what I want: enum type { sword; } //not valid code! enum swordSubtype extends type.sword { short, long } Question: How can I define this connection between two data type (or more exactly: two value of the data types), what is the most simple and standard way? Array-like data with all valid (itemType,itemSubtype) enum pairs or (itemType,itemSubtype[]) so more subtype for one type, it would be the best. OK but how can I construct this simplest way? Special enum with "subenum" set or second level enum or anything else if it does exists 2 dimensional "canBePairs" array, itemType and itemSubtype dimensions with all type and subtype and boolean elements, "true" means itemType (first dimension) and itemSubtype (second dimension) are okay, "false" means not okay Other better idea Thank you very much!

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• What are your "must have", free (gratis), programs?

  - by flybywire

  Poll: What software must you always keep handy? I don't care if it is open source, freeware, or demo, as long as its price is $0. Neither do I care if it is for desktops, handhelds, netbooks, web based, cellphones. If it is free to use – and essential to your happiness and well-being – put it in this list. Rules: Please, list only ONE application per answer, so that people can vote up the items that they prefer. Please do not post applications that have already been posted - instead, up-vote the existing answer.

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• Installation causing broken packages

  - by AWE

  Here I come I am so determined to use Ubuntu that I paid a professional to install it for me (dualboot). When I got it I got a lot of things from the software center. Skype did not have a download button so I googled it and Ubuntu help told me to do this: sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner" and then this: sudo apt-get update && sudo apt-get install skype The terminal told me "that this is potentially harmful..." but I thought it was Ubuntu language meaning "are you sure?" Now items cannot be installed or removed until the package catalog is repaired, so I want to repair it but the package operation fails. "sudo aptitude -f install" - command not found Synaptic package manager tells me that I have two broken packages, libc6 and libc6-dev but doesn't help, only makes life complicated. What the *#$%&!!! I don't want to be forced to become a computer scientist just to be able to use a free source os. P.s. the sound stopped working

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• Tunneling HTTPS traffic via a PUTTY/SSL tunnel with SOCKS

  - by ripper234

  I have configured a SOCKS ssh tunnel to a remote proxy, and set my Firefox to use localhost:<port> as a SOCKS proxy. My intention is to tunnel outgoing HTTP/S connections from my machine via a specific 3rd party server I own (on AWS). In my testing, HTTP UTLs are forwarded properly (e.g. when I access http://jsonip.com/ from my computer I do get the server's IP) However, whenever I try to reach an HTTPS address, I get this error: The proxy server is refusing connections How do I debug/fix it? My PUTTY tunnel config is simply (some random source port number + dynamic checked): P.S. I'm aware I might need to manually accept SSL certificates. The reason I'm doing this is to resolve problems using gmail as an outbound SMTP service.

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• Multiple SSH private keys for the same host

  - by Sencha

  How can I store 2 different private SSH keys for the same host? I have tried 2 entries in /etc/ssh/ssh_config for the same host with the different keys, and I've also tried to put both keys in the same file and referencing it from one hosts setting, however both do not work. More detail: I'm running Ubuntu server (12.04) and I want to connect to GitHub via SSH to download the latest source for my projects. There are multiple projects running on the same server and each project has a GitHub repo with it's own unique deloyment key-pair. So the host is always the same (github.com) but the keys need to be different depending on which repo I'm using. Different /etc/ssh/ssh_config versions I have tried: Host github.com IdentityFile /etc/ssh/my_project_1_github_deploy_key StrictHostKeyChecking no Host github.com IdentityFile /etc/ssh/my_project_2_github_deploy_key StrictHostKeyChecking no and this with both keys in the same file: Host github.com IdentityFile /etc/ssh/my_project_github_deploy_keys StrictHostKeyChecking no I've had no luck with either. Any help would be greatly appreciated!

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• .NET vs Windows 8: Rematch!

  - by Simon Cooper

  So, although you will be able to use your existing .NET skills to develop Metro apps, it turns out Microsoft are limiting Visual Studio 2011 Express to Metro-only. From the Express website: Visual Studio 11 Express for Windows 8 provides tools for Metro style app development. To create desktop apps, you need to use Visual Studio 11 Professional, or higher. Oh dear. To develop any sort of non-Metro application, you will need to pay for at least VS Professional. I suspect Microsoft (or at least, certain groups within Microsoft) have a very explicit strategy in mind. By making VS Express Metro-only, developers who don't want to pay for Professional will be forced to make their simple one-shot or open-source application in Metro. This increases the number of applications available for Windows 8 and Windows mobile devices, which in turn make those platforms more attractive for consumers. When you use the free VS 11 Express, instead of paying Microsoft, you provide them a service by making applications for Metro, which in turn makes Microsoft's mobile offering more attractive to consumers, increasing their market share. Of course, it remains to be seen if developers forced to jump onto the Metro bandwagon will simply jump ship to Android or iOS instead. At least, that's what I think is going on. With Microsoft, who really knows?

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• Linux: Alternative to rsync? (ie, scp with resume)

  - by Joernsn

  I've been using rsync to automatically send files from one box to another, which is great compared to scp, since it supports resuming. However, when resuming a very large file (10gb) rsync has to read both files and compare them, which is very slow. I don't need fancy error handling, just "scp with resume", so here's my question: Is there an alternative to rsync/scp, that supports resuming without having to read both source and destination files? I've read the manuals without finding anything I can use, please let me know if I've missed something. This is the rsync line I've been using: rsync -av --partial --progress --inplace SRC DST

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• Git can no longer open emacs as its editor

  - by mwilliams

  I'm running Git version 1.7.3.2 that I built from source, zsh is my shell, and emacs is my editor. Recently I started seeing the following: /usr/local/Cellar/git/1.7.3.2/libexec/git-core/git-sh-setup: line 106: emacs: command not found Could not execute editor My zshrc looks like the following so I can use the Cocoa build and the console binary provided with it. EMACS_HOME="/Applications/Emacs.app/Contents/MacOS" function e() { PATH=$EMACS_HOME/bin:$PATH $EMACS_HOME/Emacs -nw $@ } function ec() { PATH=$EMACS_HOME/bin:$PATH emacsclient -t $@ } function es() { e --daemon=$1 && ec -s $1 } function el() { ps ax|grep Emacs } function ek() { $EMACS_HOME/bin/emacsclient -e '(kill-emacs)' -s $1 } function ecompile() { e -eval "(setq load-path (cons (expand-file-name \".\") load-path))" \ -batch -f batch-byte-compile $@ } alias emacs=e alias emacsclient=ec And I also have export EDITOR="emacs" and have tried adding export GIT_EDITOR="emacs" (and swapping that out with "e") But whatever I try I can't get git to open emacs whenever I need to do a commit or an interactive rebase, etc etc...

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• Dates not recognized as dates in pivot table pulling directly from SQL Server

  - by Michael K

  My pivot pulls from an external data source with a date column. Excel doesn't see this column as a date and the 'Format Cells' option panel doesn't change how the dates are displayed. The cell data is left-aligned, suggesting a string rather than a date. I have tried cast(myvar as date) and convert(varchar, myvar, 101) and convert(varchar, myvar, 1) in the base table, but none of these have been picked up by Excel as dates. If the column is recognized as a date, I can group by week and month. I understand that if I can't fix this, the next step is to add columns with weeks and months for each date to the table, but I'd like to give formatting the column one more shot before doing that.

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• Do I need a license to create pdf files? [closed]

  - by Fire-Dragon-DoL

  I hope this is the correct place where I could ask this question. My mother is an accountant with a degree in economics. She works as a freelancer and she needs some licenses for her job. The biggest problem is adobe acrobat standard, which costs 400€, quite a lot. I want understand if she must buy it to create pdf files or she can use some free (even for commercial use) programs that she has because of her job (the chamber of commerce provide some advantages to accountants). She is actually using PDFCreator, which as I can read is free for business usage (open source also!!): http://sourceforge.net/projects/pdfcreator/ Thanks for any suggestion

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• ArchBeat Link-o-Rama for 2012-09-26

  - by Bob Rhubart

  Oracle Introduces Free Version of Oracle Application Development Framework Several community bloggers have already written about Oracle Application Development Framework (ADF) Essentials, the free version of Oracle ADF. Here's the official press release. ADF Essentials - Quick Technical Review | Andrejus Baranovskis "This post is just a quick review for ADF Essentials on Glassfish," says Oracle ACE Director Andrejus Baranovskis. "I will do a proper performance test soon to compare ADF performance on 5 ways to think like a cloud architect | ZDNet "Is enterprise architecture ready for the cloud? Is the cloud ready for EA?" Joe McKendrick asks. "Cloud represents a different way of thinking. But we've been here before." Configuring trace file size and number in WebCenter Content 11g | Kyle Hatlestad A quick tip from Oracle Fusion Middleware A-Team member Kyle Hatlestad. Thought for the Day "Elegance is not a dispensable luxury but a factor that decides between success and failure." — Edsger W. Dijkstra (May 11, 1930 – August 6, 2002) Source: SoftwareQuotes.com

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• Automatically cycle numerous or large files to the trash

  - by minameismud

  I've been tasked with fixing a vendor's program that, under certain conditions, dumps gigs of junk files into a log directory. It ends up filling users' machines. My task is to figure out how to make it stop without any source code or additional running processes, and without making the program kasplode. In other words, I'm looking to use a feature of the file system to control the growth. One idea I had was to make a hard link from that folder to NUL, as you might with /dev/null in the linux world. However, my attempts to use the mklink program to create a junction result in a message that says Local volumes are required to complete the operation. Any ideas on how to complete the junction, or other ideas to solve the problem?

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• SnapBird Supercharges Your Twitter Searches

  - by ETC

  Twitter’s default search tool is a bit anemic. If you want to supercharge your Twitter search, fire up web-based search tool SnapBird and dig into your past tweets as well as those of friends and followers. Yesterday I was trying to find a tweet I’d sent some time last year regarding my search for an application that could count keystrokes for inclusion in my review of the app I finally found to fulfill the need, KeyCounter. Searching for it with Twitter’s search tool yielded nothing. One simple search at SnapBird and I nailed it. SnapBird requires no authentication to search public tweets (both your own and those of your friends and follows) but does require authentication in order to search through your sent and received direct messages. SnapBird is a free service. SnapBird Latest Features How-To Geek ETC Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware How to Change the Default Application for Android Tasks Stop Believing TV’s Lies: The Real Truth About "Enhancing" Images The How-To Geek Valentine’s Day Gift Guide Inspire Geek Love with These Hilarious Geek Valentines MyPaint is an Open-Source Graphics App for Digital Painters Can the Birds and Pigs Really Be Friends in the End? [Angry Birds Video] Add the 2D Version of the New Unity Interface to Ubuntu 10.10 and 11.04 MightyMintyBoost Is a 3-in-1 Gadget Charger Watson Ties Against Human Jeopardy Opponents Peaceful Tropical Cavern Wallpaper

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• Ubuntu 12.04 Freezes w/ Ethernet Unplugged + Wireless Drops (Acer Aspire 5516)

  - by Grand Master T

  Ubuntu 12.04-12.10 32/64 freezes or won't boot if the Ethernet cable is unplugged and will not hold a wireless connection. Here is my scenario... Laptop: Acer Aspire 5516 Wireless card: Broadcom BCM4312 Ubuntu 12.04 32/64 Issues Unity 3d won't load without the Ethernet cable plugged in. If I let it load with Ethernet plugged in, it will freeze once I disconnect the cable. Unity 2d will load without the Ethernet cable plugged. In Unity 2d, wireless cannot hold a connection. I can connect to a Wireless network, but when I try to use it (i.e. open a browser), it disconnects. I can reconnect by disabling wireless (uncheck Enable Wireless), re-enable wireless, and reconnect. But, it will disconnect again once I start using it. Ubuntu 12.10 Issues Since 12.10 only gives me the option to load 3d (I assume), I experience the same thing as the first issue in 12.04. Attempted Solutions Enable networking/LAN in BIOS Set LAN first in boot priority in BIOS Remove STA wireless driver (bcmwl-kernel-source) and install b43 low power driver (firmware-b43-lpphy-installer). Remove default Network Manager and install Wicd. So far, I have had no luck with fixing this issue. Does anyone have any further suggestions?

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• How to customize Windows 7 HAL library during installation (BSOD STOP: 0x000000A5)?

  - by koldovsky

  While trying to install Windows 7 x86 Ultimate on Samsung M40 laptop (Pentium M 1.7 Dothan, 2 GB RAM/ 100 GB HDD) i receive BSOD STOP: 0x000000A5: The bios in this system is not fully ACPI compliant. Please contact your system vendor for an updated bios. The bios on the system is updated to latest version. If ACPI is the real source of the issue it means that I possibly could use another HAL library. In Windows XP it is possible to install system with generic HAL library pressing F7 when installer asks to supply drivers, but on Windows 7 I can't find such option. Ironically, Vista installs and works nice, even if they said that Windows 7 is less demanding for hardware. Windows 7 Advisor also tells nothing suspicious. Can anybody tell me how to customize Windows 7 installer to use generic HAL library (if it is possible, of course) or point me to another solution?

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• problems texture mapping in modern OpenGL 3.3 using GLSL #version 150

  - by RubyKing

  Hi all I'm trying to do texture mapping using Modern OpenGL and GLSL 150. The problem is the texture shows but has this weird flicker I can show a video here http://www.youtube.com/watch?v=xbzw_LMxlHw and I have everything setup best I can have my texcords in my vertex array sent up to opengl I have my fragment color set to the texture values and texel values I have my vertex sending the textures cords to texture cordinates to be used in the fragment shader I have my ins and outs setup and I still don't know what I'm missing that could be causing that flicker. here is my code FRAGMENT SHADER #version 150 uniform sampler2D texture; in vec2 texture_coord; varying vec3 texture_coordinate; void main(void){ gl_FragColor = texture(texture, texture_coord); } VERTEX SHADER #version 150 in vec4 position; out vec2 texture_coordinate; out vec2 texture_coord; uniform vec3 translations; void main() { texture_coord = (texture_coordinate); gl_Position = vec4(position.xyz + translations.xyz, 1.0); } Last bit here is my vertex array with texture cordinates GLfloat vVerts[] = { 0.5f, 0.5f, 0.0f, 0.0f, 1.0f , 0.0f, 0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f}; //tex x and y HERE IS THE ACTUAL FULL SOURCE CODE if you need to see all the code in its fullest glory here is a link to every file http://ideone.com/7kQN3 thank you for your help

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• "This file came from another computer..." - how can I unblock all the files in a folder without having to unblock them individually?

  - by Schnapple

  Windows XP SP2 and Windows Vista have this deal where zone information is preserved in downloaded files to NTFS partitions, such that it blocks certain files in certain applications until you "unblock" the files. So for example if you download a zip file of source code to try something out, every file will display this in the security settings of the file properties "This file came from another computer and might be blocked to help protect this computer" Along with an "Unblock" button. Some programs don't care, but Visual Studio will refuse to load projects in solutions until they've been unblocked. While it's not terribly difficult to go to every project file and unblock it individually, it's a pain. And it does not appear you can unblock multiple selected files simultaneously. Is there any way to unblock all files in a directory without having to go to them all individually? I know you can turn this off globally for all new files but let's say I don't want to do that

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• Distributing application updates using SCCM 2007

  - by theraneman

  Hi all, If there are any System Center Config Manager (SCCM) users out there, please clarify my doubt here. I have used the ConfigMgr console to distribute a custom application to a client machine. Now I need to distribute some updated files of that application. Isnt's it possible to add those files in the same package source used earlier and advertise again? Or should I use the SCCM software update section for this? Not sure if its only me, but the Software distribution process looks much easier than the Software Updates process in SCCM 2007. Please do let me know if there any online tutorials which explain how to update a custom application. Any help much appreciated.

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• Sharepoint 2007 Event ID 6482

  - by Dave M

  Our two server SharePoint 2007 SP2 farm has an issue. Event ID 6482 appears in the Application log of the Web front end many times a day. Often many time a minute. The full error is from Office SharePoint Server Event Type: Error Event Source: Office SharePoint Server Event Category: Office Server Shared Services Event ID: 6482 Date: 11/12/2009 Time: 3:05:22 PM User: N/A Computer: XXXXXX Description: Application Server Administration job failed for service instance Microsoft.Office.Server.Search.Administration.SearchServiceInstance (36a9b7ef-59aa-4f94-8887-8bf7b56f2f91). Reason: Error during encryption or decryption. System error code 0. Techinal Support Details: System.ArgumentException: Error during encryption or decryption. System error code 0. at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.SynchronizeDefaultContentSource(IDictionary applications) at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize() at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. The SharePoint site appears to be functioning normally and Search returns expected results. Any suggestions would be appreciated

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