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• AWS ELB as backend for Varnish Accelerator

  - by addisonj

  I am working on a large deployment on AWS that has high uptime requirements and variable loads throughout the day. Obviously, this is the perfect use case for ELB (Elastic Load Balancer) and autoscaling. However, we also rely on varnish for caching of API calls. My initial instinct was to structure the stack so that varnish uses ELB as a backend which in turn hits an appGroup. Varnish -> ELB -> AppServers However, according to a few sources that isn't possible as ELB constantly changes the IP address of its DNS hostname, which varnish caches on start, meaning changes to the IP won't be picked up by varnish. Reading around however, it looks like people are doing this so I am wondering what workarounds exist? Perhaps a script to reload the vcl periodically? In the case of where this is really just not a good idea, any idea of other solutions?

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• The Science Behind Salty Airline Food

  - by Jason Fitzpatrick

  In this collection, Artist Signe Emma combines a scientific overview of the role salt plays in airline food with electron microscope scans of salt crystals arranged to look like the views from an airplane–a rather clever and visually stunning way to deliver the message. Attached to the collection is this explaination of why airlines load their snacks and meals with salt: White noise consists of a random collection of sounds at different frequencies and scientists have demonstrated that it is capable of diminishing the taste of salt. At low-pressure conditions, higher taste and odour thresholds of flavourings are generally observed. At 30.000 feet the cabin humidity drops by 15%, and the lowered air pressure forces bodily fluids upwards. With less humidity, people have less moisture in their throat, which slows the transport of odours to the brains smell and taste receptors. That means that if a meal should taste the same up in the air, as on ground it needs 30% of extra salt. To combat the double assault on our sense of taste, the airlines boost the salt content to compensate. For more neat microscope scans as high-altitude view photographs, hit up the link below. How to Play Classic Arcade Games On Your PC How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8

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• Compiling kernal problem

  - by James

  Hi, I have a hp pavilion dm3t with intel HD graphics running ubuntu 10.10 64 bit. I'm trying to compile and install a patched kernel according to this, https://launchpad.net/~kamalmostafa/+archive/linux-kamal-mjgbacklight So I downloaded the tarball from here (linked to from the page above): http://kernel.ubuntu.com/git?p=kamal/ubuntu-maverick.git;a=shortlog;h=refs/heads/mjg-backlight I untar'd it to a directory, entered the directory and did: make defconfig which was successful, so I did: make which seemed to work fine until it gave these errors: ubuntu/ndiswrapper/iw_ndis.c:1966: error: unknown field ‘num_private’ specified in initializer ubuntu/ndiswrapper/iw_ndis.c:1966: warning: initialization makes pointer from integer without a cast ubuntu/ndiswrapper/iw_ndis.c:1967: error: unknown field ‘num_private_args’ specified in initializer ubuntu/ndiswrapper/iw_ndis.c:1967: warning: excess elements in struct initializer ubuntu/ndiswrapper/iw_ndis.c:1967: warning: (near initialization for ‘ndis_handler_def’) ubuntu/ndiswrapper/iw_ndis.c:1970: error: unknown field ‘private’ specified in initializer ubuntu/ndiswrapper/iw_ndis.c:1970: warning: initialization makes integer from pointer without a cast ubuntu/ndiswrapper/iw_ndis.c:1970: error: initializer element is not computable at load time ubuntu/ndiswrapper/iw_ndis.c:1970: error: (near initialization for ‘ndis_handler_def.num_standard’) ubuntu/ndiswrapper/iw_ndis.c:1971: error: unknown field ‘private_args’ specified in initializer ubuntu/ndiswrapper/iw_ndis.c:1971: warning: initialization from incompatible pointer type make[2]: *** [ubuntu/ndiswrapper/iw_ndis.o] Error 1 make[1]: *** [ubuntu/ndiswrapper] Error 2 make: *** [ubuntu] Error 2 How can I compile and install this kernel successfully? I'm new to this and would appreciate any help.

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• Laptop battery life drastically decreased compared to Windows 7

  - by Aron Rotteveel

  I am running Ubuntu 10.10 on my Dell Studio XPS 1640 and have about one hour of battery life in it, compared to about 2.5 hours running on Windows 7. This is with wireless and bluetooth on, but still, the difference seems incredible. What could be causing such a difference and is there a way to close the gap without losing core functionality? EDIT: here's some output from powertop. This is with bluetooth turned off and Wifi turned on. The output seems pretty normal to me, but as indicated, this is about 1 hour of battery life on a full battery... Wakeups-from-idle per second : 476.2 interval: 10.0s Power usage (ACPI estimate): 2.5W (1.2 hours) Top causes for wakeups: 30.0% (167.2)D chrome 21.0% (117.3) [extra timer interrupt] 13.9% ( 77.4) [kernel scheduler] Load balancing tick 3.4% ( 18.9)D xchat 7.1% ( 39.8) [iwlagn] <interrupt> 5.9% ( 32.9) AptanaStudio3 3.9% ( 21.6)D java 2.7% ( 14.9) [TLB shootdowns] <kernel IPI> 2.5% ( 14.1) docky 1.8% ( 10.0) nautilus 1.6% ( 9.0) thunderbird-bin 1.0% ( 5.5) [ahci] <interrupt> 0.9% ( 5.0) syndaemon 0.8% ( 4.3) [kernel core] hrtimer_start (tick_sched_timer) EDIT: after changing /proc/sys/vm/laptop_mode to 5 (it was set to 0), wakeups seem to have decreased, although usage still seems far too high: Wakeups-from-idle per second : 263.8 interval: 10.0s Power usage (ACPI estimate): 2.6W (0.9 hours) EDIT: I seem to have discovered the main cause: I was using the open source ATI Drivers. I recently installed the official ATI drivers and laptop battery life seems to have doubled since. EDIT: last edit. The previous 'solution' of installing the official ATI drivers turns out to be a non-solution. Although it does increase battery life, my laptop resolution is maxed out at 1200x800 after a reboot. (Please note that this problem does not need answering in this question as it is a seperate case)

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• Nginx & Lua: Hacks, optimizations & observations

  - by Quintin Par

  Following this post on using Lua to increase nginx’s flexibility and in reducing load on the web stack I am curious to know how people are using Lua to enhance nginx’s capability. Are there any notable hacks, optimizations & observations using Lua? Hacks that people have used to discover capability with Nginx that would otherwise be complicated/impossible with a webserver or reverse proxy? Edit: Links: http://thechangelog.com/post/3249294699/super-nginx-killer-build-of-nginx-build-for-luajit-plus http://skillsmatter.com/podcast/home/scripting-nginx-with-lua/te-4729 http://devblog.mixlr.com/2012/06/26/how-we-use-nginx-lua-and-redis-to-beta-ify-mixlr/

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• Architectural and Design Challenges with SOA

  With all of the hype about service oriented architecture (SOA) primarily through the use of web services, not much has been said about potential issues of using SOA in the design of an application. I am personally a fan of SOA, but it is not the solution for every application. Proper evaluation should be done on all requirements and use cases prior to deciding to go down the SOA road. It is important to consider how your application/service will handle the following perils as it executes. Example Challenges of SOA Network Connectivity Issues Handling Connectivity Issues Longer Processing/Transaction Times How many of us have had issues visiting our favorite web sites from time to time? The same issue will occur when using service based architecture especially if it is implemented using web services. Forcing applications to access services via a network connection introduces a lot of new failure points to the application. Potential failure points include: DNS issues, network hardware issues, remote server issues, and the lack of physical network connections. When network connectivity issues do occur, how are the service clients are implemented is very important. Should the client wait and poll the service until it is accessible again? If so what is the maximum wait time or number of attempts it should retry. Due to the fact of services being distributed across a network automatically increase the responsiveness of client applications due to the fact that processing time must now also include time to send and receive messages from called services. This could add nanoseconds to minutes per each request based on network load and server usage of the service provider. If speed highly desirable quality attribute then I would consider creating components that are hosted where the client application is located. References: Rader, Dave. (2002). Overcoming Web Services Challenges with Smart Design: http://soa.sys-con.com/node/39458

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• Accessing localhost via IIS 7.5 on Windows 7 very slow

  - by Ian Devlin

  (I've asked this over on stackoverflow already, but thought I'd ask here as well) I'm currently running an ASP.NET application on IIS 7.5 on Windows 7. When I access this application on Internet Explorer (either 6, 7 or 8) it is incredible slow and often fails to load at all. There are messages at the bottom saying: Waiting for http://localhost/....... or sometimes waiting for about:blank (I've read that this can be a virus, but I've run all the usual checks and it's not). constantly, but it returns with the usual: "Internet Explorer cannot display the webpage" I've also tried this by using 127.0.0.1 and the machine name, with the same results. I've tried the same application on the latest Firefox, Safari, Chrome and Opera and they all work fine. I've also installed the same application on a Windows Server 2003 machine, and it all works fine via Internet Explorer. I've also turned off the IPv6 setting on the LAN connection. Soes anyone have any ideas why this doesn't work with Internet Explorer and yet does with other browsers?

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• Sensitive data in init scripts

  - by Steve Jorgensen

  I'm adapting some examples I've found by Googling to build an init script to run a VirtualBox OSE virtual machine as a daemon. I would like to specify a password for VNC access to the VM, and this must be given as an argument to the VBoxHeadless command. Conventionally, init scripts are readable by standard users, and this seems like a useful convention, but I also don't want the VNC password for this VM to be stored in easily accessible plain text. What's the most appropriate/conventional way to handle this kind of situation? Maybe put a root-readable supporting data file someplace, and have the init script load the value from there?

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• What is the maximum number of virtualhosts Apache can handle?

  - by FractalizeR

  Hello. What is the maximum number of VirtualHosts Apache can handle on a single machine (I don't mean anything related to load, let's suppose it's irrelevant for the question). And we take only Apache without any proxifying things like nginx. I am asking because on one forum one guy reported that his Apache works unstable with the number of sites more than 400 on a single machine. If you have a config, that handles more than 400, please tell me here. Thanks.

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• Is this a normal operating temperature range for a New Third-Generation MacBook Air (2.13 MHz, 120 G

  - by doug

  Even with just my text editor open (no web browser) and maybe the terminal, the baseline temperature is usually above 40 C. When i open 4-5 browser tabs in Safari (even if none of Sites have Flash) the temp can quickly go over 50 C. (In addition, i am observing these temps even though i have turned the fan up to 3000 rpms). (i have install smcFanControl on my MBA so i can see the temp in the menu bar.) So this means my MBA is running much warmer than my MBP; and in practice, it means that i have to be very careful how i use my MBA. Of course if i load a Site with Flash, it just freaks out, and often quickly goes above 65 C (I've installed a flash blocker to avoid this). Is anyone else observing this behavior? I have checked the Apple boards and sure enough, there are a lot of complaints, but nothing from Apple.

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• D-Link DWA-125 constantly disconnecting in winXP, but works fine on ubuntu..

  - by sil3nt

  Hey there, I'm dual booting winXp and ubuntu 10.10. I'm using a DWA-125 usb adapter to connect to my home wifi connection and I'm having this odd issue. First off, in ubuntu the adapter works fine and I have no trouble at all, but when I boot back in XP I get a dlink connetion wizard and the connection times out after every 2 minutes. It's odd because I can actually load up web pages and use the internet for 2 minutes, and then it would disconnect and the whole thing would repeat. I did a system restore on xp and this stopped the whole connect-disconnect thing but once I booted into ubuntu and came back to xp it started all over again!(?). Any ideas as to how I would go about fixing this?

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• If I implement a web-service, how do I respond to POST requests with JSON?

  - by Vova Stajilov

  I have to make a rather complex system for my diploma work. Logically it will consist of the following components: Database Web-service Management with web interface Client iOS application that will consume web-service I decided to implement all the first three components under .NET. Firstly I will create a database depending on the information load - this is clear. But then I need a web-service that will return data in JSON format for iOS clients to consume - that's obvious and not that hard to implement. For this I will use WCF technology. Now I have a question, if I implement the web-service, how will I be able to respond to POST requests with JSON? It probably involves WCF JSON or something related? But I also need some web pages as admin part, so will this web-application be able to consume my centralized web-services as well or I should develop it separately? I just want my web service to act like a set of controllers. There is a related question here but this doesn't quite reflect my question.

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• CodePlex Daily Summary for Tuesday, December 18, 2012

  CodePlex Daily Summary for Tuesday, December 18, 2012Popular Releasessb0t v.5: sb0t 5 Template for Visual Studio: This is the official sb0t 5 template for Visual Studio 2010 and Visual Studio 2012 for C# programmers. Use this template to create your own sb0t 5 extensions.F# PowerPack with F# Compiler Source Drops: PowerPack for FSharp 3.0 + .NET 4.x + VS2010: This is a release of the old FSharp Power Pack binaries recompiled for F# 3.0, .NET 4.0/4.5 and Silveright 5. NOTE: This is for F# 3.0 & .NET 4.0 or F# 3.0 & Silverlight 5 NOTE: The assemblies are no longer strong named NOTE: The assemblies are not added to the GAC NOTE: In some cases functionality overlaps with F# 3.0, e.g. SI Units of measurecodeSHOW: codeSHOW AppPackage Release 16: This release is a package file built out of Visual Studio that you can side load onto your machine if for some reason you don't have access to the Windows Store. To install it, just unzip and run the .ps1 file using PowerShell (right click | run with PowerShell). Attention: if you want to download the source code for codeSHOW, you're in the wrong place. You need to go to the SOURCE CODE tab.Move Mouse: Move Mouse 2.5.3: FIXED - Issue where it errors on load if the screen saver interval is over 333 minutes.LINUX????????: LINUX????????: LINUX????????cnbeta: cnbeta: cnbetaCSDN ??: CSDN??????: CSDN??????PowerShell Community Extensions: 2.1.1 Production: PowerShell Community Extensions 2.1.1 Release NotesDec 16, 2012 This version of PSCX supports both Windows PowerShell 2.0 and 3.0. Bug fix for HelpUri error with the Get-Help proxy command. See the ReleaseNotes.txt download above for more information.VidCoder: 1.4.11 Beta: Added Hungarian translation, thanks to Brechler Zsolt. Update HandBrake core to SVN 5098. This update should fix crashes on some files. Updated the enqueue split button to fit in better with the active Windows theme. Updated presets to use x264 preset/profile/level.BarbaTunnel: BarbaTunnel 6.0: Check Version History for more information about this release.???: Cnblogs: CNBLOGSSandcastle Help File Builder: SHFB v1.9.6.0 with Visual Studio Package: General InformationIMPORTANT: On some systems, the content of the ZIP file is blocked and the installer may fail to run. Before extracting it, right click on the ZIP file, select Properties, and click on the Unblock button if it is present in the lower right corner of the General tab in the properties dialog. This new release contains bug fixes and feature enhancements. There are some potential breaking changes in this release as some features of the Help File Builder have been moved into...Electricity, Gas and Temperature Monitoring with Netduino Plus: V1.0.1 Netduino Plus Monitoring: This is the first stable release from the Netduino Plus Monitoring program. Bugfixing The code is enhanced at some places in respect to the V0.6.1 version There is a possibility to add multiple S0 meters Website for realtime display of data Website for configuring the Netduino Comments are welcome! Additions will not be made to this version. This is the first and last major Netduino Plus V1 release. The new development will take place with the Netduino Plus V2 development board in mi...CRM 2011 Visual Ribbon Editor: Visual Ribbon Editor (1.3.1116.8): [FIX] Fixed issue not displaying CRM system button images correctly (incorrect path in file VisualRibbonEditor.exe.config)My Expenses Windows Store LOB App Demo: My Expenses Version 1: This is version 1 of the MyExpenses Windows 8 line of business demo app. The app is written in XAML and C#. It calls a WCF service that works with a SQL Server database. The app uses the Callisto toolkit. You can get it at https://github.com/timheuer/callisto. The Expenses.sql file contains the SQL to create the Expenses database. The ExpensesWCFService.zip file contains the WCF service, also written in C#. You should create a WCF service. Create an Entity Framework model and point it to...BlackJumboDog: Ver5.7.4: 2012.12.13 Ver5.7.4 (1)Web???????、???????????????????????????????????????????VFPX: ssClasses A1.0: My initial release. See https://vfpx.codeplex.com/wikipage?title=ssClasses&referringTitle=Home for a brief description of what is inside this releaseLayered Architecture Solution Guidance (LASG): LASG 1.0.0.8 for Visual Studio 2012: PRE-REQUISITES Open GAX (Please install Oct 4, 2012 version) Microsoft® System CLR Types for Microsoft® SQL Server® 2012 Microsoft® SQL Server® 2012 Shared Management Objects Microsoft Enterprise Library 5.0 (for the generated code) Windows Azure SDK (for layered cloud applications) Silverlight 5 SDK (for Silverlight applications) THE RELEASE This release only works on Visual Studio 2012. Known Issue If you choose the Database project, the solution unfolding time will be slow....Fiskalizacija za developere: FiskalizacijaDev 2.0: Prva prava produkcijska verzija - Zakon je tu, ova je verzija uskladena sa trenutno važecom Tehnickom specifikacijom (v1.2. od 04.12.2012.) i spremna je za produkcijsko korištenje. Verzije iza ove ce ovisiti o naknadnim izmjenama Zakona i/ili Tehnicke specifikacije, odnosno, o eventualnim greškama u radu/zahtjevima community-a za novim feature-ima. Novosti u v2.0 su: - That assembly does not allow partially trusted callers (http://fiskalizacija.codeplex.com/workitem/699) - scheme IznosType...Bootstrap Helpers: Version 1: First releaseNew ProjectsAsh Launcher: The ash launcher is a launcher for the ash modpack for minecraftAsynchronous PowerShell Module: psasync is a PowerShell module containing simple helper functions to allow for multi-threaded operations using Runspaces. ClearVss: ClearVss clear any reference of Visual SourceSafe in yours solution. You'll no longer have to delete and modify solution files by hand. It's developed in C#dewitcher Framework: A rly cool Framework, made for use with COSMOS. - Console-class that supports colored, horizontal- and vertical- centered text printing - more =PGTD Pad: Notepad for GTD TechniqueHTML/JavaScript Rendering Web Part: HTML/JavaScript Render Web Part - replaces the SharePoint Content Editor Web Part (CEWP). Permits flying in script, HTML, etc. to a SharePoint Page.Kracken Generator and Architecture Tool for Visual Studio 2012: Welcome to Kracken a suite of tools for creating code from Architecture models. This program is the pet project of Tracy Rooks.Logica101: Aplicación para visualización de procesos algebraicosManaged DismApi Wrapper: This is a managed wrapper for the native Deployment Image Servicing and Management (DISM) API. This allows .NET developers to call into the native API instead Mvc web-ajax: A Javascript library for displaying lists and editing objects N2F Yverdon InfoBoxes: A simple extension (plus some resources) for managing information boxes on a given page.N2F Yverdon Solar Flare Reflector: The solar flare reflector provides minimal base-range protection for your N2F Yverdon installation against solar flare interference.newplay: goodPhnyx: The project is under re-structuring - look backPigeonCms: Cms made with c# (using NET framework 3.5, SqlServer2005 or Express edition) with many Joomla-like features. Poppæa: Very early version of a c# library for cassandra nosql database. For now it adds support for the new CQL3 protocol in cassandra 1.2+. Proximity Tapper: Proximity Tapper is a developer tool for working with NFC on both Windows Phone and Windows, and allows you to build NFC apps in the Windows Phone emulator.SharePoint 2010 SpellCheck: SharePoint 2010 SpellCheck Project will let you enable spelling check functionality in SharePoint 2010 using SpellCheck.asmxShift8Read Community Credit Tool (DotNetNuke Module): A simple DotNetNuke Module I created for submitting content to Community-Credit.comTempistGamer Client: The tempistgamers game client manager. Includes a cross-platform, cross-game UI to allow for player interactivity. While the program itself manages the games.testtom12122012tfs02: fdstesttom12172012tfs02: uioTEviewer: The Transient Event Viewer is an application designed for visualization and analysis of transient events.trucho-JCI: summaryTypeSharp: TypeSharp is a C# to TypeScript code generatorWeiboWPSdk: To make wp applications about sina weibo more easily.XNA Games Core: XNA Core Game Programming library. Uses interfaces and delegates, in tune with the .NET way, with inheritence used for implementation reuse.

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• Ubuntu installer does not show drives

  - by Tanweer Rashid

  I am trying to install Ubuntu 12.04 LTS on my Inspiron laptio, but the installer does not show any drives. My system has a 1TB SATA drive and a 32GB SSD. As far as I can figure, the boot files are kept on the SSD for fast startup (for Windows). During Win7 installation, I had to manually load drivers for RAID controller to see all available drives. Running fdisk -l from the live CD shows the following: ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x234b4782 Device Boot Start End Blocks Id System /dev/sda1 63 80324 40131 de Dell Utility /dev/sda2 * 81920 41627647 20772864 7 HPFS/NTFS/exFAT /dev/sda3 41627648 357019647 157696000 7 HPFS/NTFS/exFAT /dev/sda4 357019648 1953517567 798248960 f W95 Ext'd (LBA) /dev/sda5 672415744 1312966655 320275456 7 HPFS/NTFS/exFAT /dev/sda6 1312968704 1953517567 320274432 7 HPFS/NTFS/exFAT Disk /dev/sdb: 32.0 GB, 32017047552 bytes 255 heads, 63 sectors/track, 3892 cylinders, total 62533296 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x234b474b Device Boot Start End Blocks Id System /dev/sdb1 2048 16775167 8386560 84 OS/2 hidden C: drive ubuntu@ubuntu:~$ In the Ubuntu installer, I can only choose /dev/sdb for "Device for boot loader installation", and sdb doesn't show any drives. I cannot select /dev/sda. Any ideas anyone? Thanks.

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• SFML - Moving a sprite on mouseclick

  - by Mike

  I want to be able to move a sprite from a current location to another based upon where the user clicks in the window. This is the code that I have: #include <SFML/Graphics.hpp> int main() { // Create the main window sf::RenderWindow App(sf::VideoMode(800, 600), "SFML window"); // Load a sprite to display sf::Texture Image; if (!Image.LoadFromFile("cb.bmp")) return EXIT_FAILURE; sf::Sprite Sprite(Image); // Define the spead of the sprite float spriteSpeed = 200.f; // Start the game loop while (App.IsOpened()) { if (sf::Keyboard::IsKeyPressed(sf::Keyboard::Escape)) App.Close(); if (sf::Mouse::IsButtonPressed(sf::Mouse::Right)) { Sprite.SetPosition(sf::Mouse::GetPosition(App).x, sf::Mouse::GetPosition(App).y); } // Clear screen App.Clear(); // Draw the sprite App.Draw(Sprite); // Update the window App.Display(); } return EXIT_SUCCESS; } But instead of just setting the position I want to use Sprite.Move() and gradually move the sprite from one position to another. The question is how? Later I plan on adding a node system into each map so I can use Dijkstra's algorithm, but I'll still need this for moving between nodes.

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• Nginx Static Content Server Maxing Out?

  - by Harry

  I use nginx to serve the static content for a decently busy website of mine. I have the logging disabled, and 4 worker processes enabled with 5,000 connections per worker (which should yield a max connection limit of 20,000. The server is only operating at about 10% CPU usage and 50% ram, but it's very laggy, and sometimes nginx is so slow to respond to the requests, it times out. For a small number of connections, it's fine, but once any load starts occurring (~2,500 connections), it backs up and bogs down. Is there any other bottlenecks or limits that I might be hitting? This is a FreeBSD server, and all the static files are located locally (not NFS). The NIC is an unmetered gigabit, and it's only using around 75 megabit. Any insight would be appreciated. Thanks.

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• Hybrid drive not booting faster than a normal HD

  - by Nigel Trotter

  I have used Windows 7 to create an image of my existing standard 160GB HD and copied this image back to a bigger 500GB Seagate hybrid drive. After copying the image to the hybrid I had to resize the partition, which was fine but after rebooting a few times to "teach" the hybrid, I have no increase in boot speed. It still takes 20-25 seconds to close down and then over a minute to start up. Is this something to do with the way the image lays itself on the drive indiscriminately? Do I need to load the OS on the drive from scratch to get the benefits? My PC with an i5 processor, is using AHCI mode.

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• Shared to Dedicated or Amazon CloudFront to improve performances and keep secured?

  - by user978548

  I have a Wordpress which currently takes about 1.8s to 2.5s for the home page to completely load in my country. The page weight is about 700Ko (static content included). In order to increase performances, I'm considering two solutions: Switching to a dedicated host. Using amazon s3 cloudfront to serve static contents. My current shared hosting have servers in a neighboring country but not exactly in mine, and both amazon and the dedicated hosting have some, so that's already an advantage. So considering all that, I still have three questions remaining: Currently having a low traffic (100 unique visitors/days, but growing) will it make a huge difference between my shared hosting and a dedicated server ? Knowing that I already use a cookie-less domain to deliver static contents (but using a redirection to the same server), would using amazon s3 make a real difference ? Talking about the cons of dedicated vs amazon s3, if I choose for the dedicated server something like Ubuntu server and do daily package updates and have only port 80 open, would it be sufficient in terms of security (in comparison with my current shared hosting which manage everything for me) ?

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• Functional testing in the verification

  - by user970696

  Yesterday my question How come verification does not include actual testing? created a lot of controversy, yet did not reveal the answer for related and very important question: does black box functional testing done by testers belong to verification or validation? ISO 12207:12208 here mentiones testing explicitly only as a validation activity, however, it speaks about validation of requirements of the intended use. For me its more high level, like UAT test cases written by business users ISO mentioned above does not mention any specific verification (7.2.4.3.2)except for Requirement verification, Design verification, Document and Code & Integration verification. The last two can be probably thought as unit and integrated testing. But where is then the regular testing done by testers at the end of the phase? The book I mentioned in the original question mentiones that verification is done by static techniques, yet on the V model graph it describes System testing against high level description as a verification, mentioning it includes all kinds of testing like functional, load etc. In the IEEE standard for V&V, you can read this: Even though the tests and evaluations are not part of the V&V processes, the techniques described in this standard may be useful in performing them. So that is different than in ISO, where validation mentiones testing as the activity. Not to mention a lot of contradicting information on the net. I would really appreciate a reference to e.g. a standard in the answer or explanation of what I missed in the ISO. For me, I am unable to tell where the testers work belong.

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• Why is the latency on one LVM volume consistently higher?

  - by David Schmitt

  I've got a server with LVM over RAID1. One of the volumes has a consistently higher IO latency (as measured by the diskstats_latency munin plugin) than the other volumes from the same group. As you can see, the dark orange /root volume has consistently high IO latency. Actually ten times the average latency of the physical devices. It also has the highest Min and Max values. My main concern are not the peaks, which occur under high load, but the constant load on (semi-)idle. The server is running Debian Squeeze with the VServer kernel and has four VServer containers and one KVM guest. I'm looking for ways to fix - or at least understand - this situation. Here're some parts of the system configuration: root@kvmhost2:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/system--host-root 19G 3.8G 14G 22% / tmpfs 16G 0 16G 0% /lib/init/rw udev 16G 224K 16G 1% /dev tmpfs 16G 0 16G 0% /dev/shm /dev/md0 942M 37M 858M 5% /boot /dev/mapper/system--host-isos 28G 19G 8.1G 70% /srv/isos /dev/mapper/system--host-vs_a 30G 23G 6.0G 79% /var/lib/vservers/a /dev/mapper/system--host-vs_b 5.0G 594M 4.1G 13% /var/lib/vservers/b /dev/mapper/system--host-vs_c 5.0G 555M 4.2G 12% /var/lib/vservers/c /dev/loop0 4.4G 4.4G 0 100% /media/debian-6.0.0-amd64-DVD-1 /dev/loop1 4.4G 4.4G 0 100% /media/debian-6.0.0-i386-DVD-1 /dev/mapper/system--host-vs_d 74G 55G 16G 78% /var/lib/vservers/d root@kvmhost2:~# cat /proc/mounts rootfs / rootfs rw 0 0 none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 none /proc proc rw,nosuid,nodev,noexec,relatime 0 0 none /dev devtmpfs rw,relatime,size=16500836k,nr_inodes=4125209,mode=755 0 0 none /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 /dev/mapper/system--host-root / ext3 rw,relatime,errors=remount-ro,data=ordered 0 0 tmpfs /lib/init/rw tmpfs rw,nosuid,relatime,mode=755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0 fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0 /dev/md0 /boot ext3 rw,sync,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-isos /srv/isos ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-vs_a /var/lib/vservers/a ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-vs_b /var/lib/vservers/b ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-vs_c /var/lib/vservers/c ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/loop0 /media/debian-6.0.0-amd64-DVD-1 iso9660 ro,relatime 0 0 /dev/loop1 /media/debian-6.0.0-i386-DVD-1 iso9660 ro,relatime 0 0 /dev/mapper/system--host-vs_d /var/lib/vservers/d ext3 rw,relatime,errors=continue,data=ordered 0 0 root@kvmhost2:~# cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2[0] sdb2[1] 975779968 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 979840 blocks [2/2] [UU] unused devices: <none> root@kvmhost2:~# iostat -x Linux 2.6.32-5-vserver-amd64 (kvmhost2) 06/28/2012 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 3.09 0.14 2.92 1.51 0.00 92.35 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 23.25 161.12 7.46 37.90 855.27 1596.62 54.05 0.13 2.80 1.76 8.00 sdb 22.82 161.36 7.36 37.66 850.29 1596.62 54.35 0.54 12.01 1.80 8.09 md0 0.00 0.00 0.00 0.00 0.14 0.02 38.44 0.00 0.00 0.00 0.00 md1 0.00 0.00 53.55 198.16 768.01 1585.25 9.35 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.48 20.21 16.70 161.71 8.62 0.26 12.72 0.77 1.60 dm-1 0.00 0.00 3.62 10.03 28.94 80.21 8.00 0.19 13.68 1.59 2.17 dm-2 0.00 0.00 0.00 0.00 0.00 0.00 9.17 0.00 9.64 6.42 0.00 dm-3 0.00 0.00 6.73 0.41 53.87 3.28 8.00 0.02 3.44 0.12 0.09 dm-4 0.00 0.00 17.45 18.18 139.57 145.47 8.00 0.42 11.81 0.76 2.69 dm-5 0.00 0.00 2.50 46.38 120.50 371.07 10.06 0.69 14.20 0.46 2.26 dm-6 0.00 0.00 0.02 0.10 0.67 0.81 12.53 0.01 75.53 18.58 0.22 dm-7 0.00 0.00 0.00 0.00 0.00 0.00 7.99 0.00 11.24 9.45 0.00 dm-8 0.00 0.00 22.69 102.76 407.25 822.09 9.80 0.97 7.71 0.39 4.95 dm-9 0.00 0.00 0.06 0.08 0.50 0.62 8.00 0.07 481.23 11.72 0.16 root@kvmhost2:~# ls -l /dev/mapper/ total 0 crw------- 1 root root 10, 59 May 11 11:19 control lrwxrwxrwx 1 root root 7 Jun 5 15:08 system--host-kvm1 -> ../dm-4 lrwxrwxrwx 1 root root 7 Jun 5 15:08 system--host-kvm2 -> ../dm-3 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-isos -> ../dm-2 lrwxrwxrwx 1 root root 7 May 11 11:19 system--host-root -> ../dm-0 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-swap -> ../dm-9 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_d -> ../dm-8 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_b -> ../dm-6 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_c -> ../dm-7 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_a -> ../dm-5 lrwxrwxrwx 1 root root 7 Jun 5 15:08 system--host-kvm3 -> ../dm-1 root@kvmhost2:~#

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• Exchange can't send emails with attachments

  - by Jack

  No one in our organization can send emails with attachments. Emails without attachments go through fine, but if an attachment is included, an error appears in the Server Failures folder under Sync Issues. The error is "The following message had an error and synchronization of it was skipped (0xc0090081)". We are using Symantec Mail Security, which we shut down to try to troubleshoot the problem, and now that fails to load. Any ideas as to what to check? I'm sorry I don't have more complete information, but I'm helping someone try to figure this out. I'm not the admin myself. Thanks.

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• Why can't I create an Alias Resource Record Set for an EC2 instance

  - by praterade

  I have been working with AWS for over a year, setting up EC2 instances, domains, ELBs, etc. When I want to assign a subdomain to an EC2 instance, I have to create an elastic IP (that I pay for), then assign a CNAME record to that elastic IP. When I want to assign a subdomain to an ELB (load balancer) instance, I just create an alias resource record set to the ELB. I've read over the docs and don't understand why AWS doesn't support aliasing to instances. Am I missing a key concept here? Wouldn't it be simpler to just alias EC2 instances and skip the whole elastic IP bit?

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• Nginx request forking

  - by Adam

  Hi, I'm wondering if nginx can "fork" a request. Let's imagine config: upstream backend { server localhost:8080; ... more servers here } server { location /myloc { FORK-REQUEST http://my-other-url:3135/something proxy_pass http://backend; } } I would like nginx to send a copy of request to the url specified by FORK-REQUEST and after that to load balance it with backend servers and return the response to the client. As I don't need the response from FORK-REQUEST it would be best if this request was async so normal prcessing doesn't have to wait. Is a scenario like this possible?

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• ERP/CRM Systems. Desktop Based ? Web based?

  - by Parhs

  Hello guys... I have seen 2-3 ERPs in action. I am wondering what is better. Desktop based application or webbased displayed on a browser. My first expirience was with a web based ERP when i was 14 years old.. It was web based and terribly slow... For most simple task you had to do lots of clicks... no keyboard support ..... Pages took ages to load. Last year i worked for migrating to a newer computer some old terminal based cobol application. The computer that worked till today and still has no problem was from 1993. The user interface ofcourse was textbased.. The speed that guys placed orders was amazing! just typing the name of the customer , then 5-10 keys to add a product to order.... Comparing to this ERP the page for placing orders Link (click sales orders) seems terribly slow to add a product... No keyboard shortcut works to save what you added and generally i believe you need 4 times more time to place an order compared to the text interface... Having to use both mouse and keyboard for this task is BAD and sadistic... So how can tek heck these people ever use a system like that ??? So in the long run desktop application seems the only way... Ofcourse browsers support shortcuts but the way to overide the defaults that browsers uses isnt cross compatible... That is a hudge problem. Finnaly, if we MUST/forced use cloud in near future what about keyboard shortcuts?? I feel confused... I have seen converters of desktop applications to browser applications but are SLOW as hell... The question is what about user friendliness?What kind of application would you use?

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• Rule of thumb for cost vs. savings for code re-use

  - by Styler

  Is it a good rule of thumb to always write code for the intent of re-using it somewhere down the road? Or, depending on the size of the component you are writing, is it better practice to design it for re-use when it makes sense with regards to time spent on it. What is a good rule of thumb for spending extra time on analysis and design on project components that have "some probability" of being needed later down the road for other things that may or may need this part. For example, if I have the need for project X to do things A, and B. A definitely needs to be written for re-use because it just makes sense to do so. B is very project specific at the moment, and I can hack it all together in a couple days to finish the project on time and give everyone kudos for being a great team, etc. Or if we say, lets spend a whole friggin' 2 weeks figuring out what project Y/Z might need this thing for and spend a load of extra time on on part B because someday we might need to use it on project Y/Z (where the savings will be realized). I'd imagine a perfect world situation would be a nicely crafted combination of project specific vs. re-use architected components given the project. However some code shops might feel it would be a great idea to write everything for the intention of using it at some point down the road.

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