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  • Cheapest High Available Web Server [closed]

    - by xyz
    I would like to create a high-available setup (e.g. a small cluster) for a webserver, i.e. it will run Apache, PHP and MySQL. There will be between 2-8 small websites running with only very little traffic and workload. High availability is however very important. I don't want to be dependent on 1 datacenter, so there must be a minimum of 2 servers placed in different datacenters, and if one server goes down, the user must experience no or only a minimum of downtime - and no data loss. I have considered Amazon AWS using their Elastic Load Balancing, since it is possible to buy 2 EC2 instances in 2 availability zones and set up load balancing and RDS (Multi-AZ). However this seems rather expensive. Using the AWS price calculator http://calculator.s3.amazonaws.com/calc5.html it totals to 185$/month the first year (including the free tier). Are my calculations incorrect or is there a cheaper way to make this HA setup? Best regards

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  • The IT Security Bubble Has Popped

    The blank check IT security enjoyed has been pulled off the table as businesses reassess how much they spend to stay safe. Need some data on the mood? McAfee reports nearly three-quarters of SMBs have cut security spending, even though 71 percent believe a serious attack would put them out of business.

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  • Open Source Gets Political

    <b>Linux User and Developer:</b> "In response to a petition, the Prime Minister has dropped Mandelson&#8217;s plans for a controversial &#8216;three strikes&#8217; rule forcing ISPs to permanently disconnect those repeatedly accused of illegal file sharing by copyright holders."

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  • Your Transaction is in Jeopardy -- and You Can't Even Know It!

    - by Adam Machanic
    If you're reading this, please take one minute out of your day and vote for the following Connect item : https://connect.microsoft.com/SQLServer/feedback/details/444030/sys-dm-tran-active-transactions-transaction-state-not-updated-when-an-attention-event-occurs If you're really interested, take three minutes: run the steps to reproduce the issue, and then check the box that says that you were able to reproduce the issue. Why? Imagine that ten hours ago you started a big transaction. You're sitting...(read more)

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  • Is Internet Explorer 8 the next IE6?

    - by Benry
    So Microsoft has stated that Internet Explorer 9, the first version of IE with wide support for HTML5 (including CSS3), will not be available on Windows XP. Given that Windows XP is still the dominant PC operating system, are web developers doomed to a prolonged future of supporting another inferior (in terms of supported features) yet stubborn browser. Does the fact that Microsoft will support XP until April of 2014 and will never support IE9 on XP mean that IE8 will be the dominant browser for the next three years?

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  • Creating a Map Report in SSRS - SQL Server 2008 R2

    SQL Server 2008 R2 brought several new features into the SSRS (SQL Server Reporting Services) arena. In the data visualization category, we now have three additional ways to display and visualize/analyze data in the reports. The Future of SQL Server Monitoring "Being web-based, SQL Monitor enables you to check on your servers from almost any location" Jonathan Allen.Try SQL Monitor now.

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  • What do you do when working with multiple languages with different capitalization schemes?

    - by dvcolgan
    I'm making a webapp using Django. The Python convention for naming variables is lowercase_with_underscores, but the Javascript convention is camelCase. In addition, I've seen many people use lowercase-with-hyphens for CSS identifiers. Would you suggest using all three naming conventions where appropriate, or picking one and using it, even if the other two recommend something else? Switching back and forth isn't a huge problem, but it can still be mental overhead.

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  • 3 Emerging SEO Trends

    Everyone knows that technology is always changing, always moving forward. Following the trends of the moment is vital for webmasters to keep their sites high on search engine rankings and ensure they are successful. Here are three search engine optimization (SEO) trends that webmasters and professionals should be aware of for this coming year.

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  • Should this code/logic be included in Business Objects class or a separate class?

    - by aspdotnetuser
    I have created a small application which has a three tier architecture and I have business object classes to represent entities such as User, Orders, UserType etc. In these classes I have methods that are executed when the Constuctor method of, for example, User is called. These methods perform calculations and generate details that setup data for attributes that are part of each User object. Here is the structure for the project in Visual Studio: Here is some code from the business object class User.cs: Public Class User { public string Name { get; set; } public int RandomNumber { get; set; } etc public User { Name = GetName(); RandomNumber = GetRandomNumber(); } public string GetName() { .... return name; } public int GetRandomNumber() { ... return randomNumber; } } Should this logic be included in the Business Object classes or should it be included in a Utilities class of some kind? Or in the business rules?

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  • Should the test and the fix be written by different people?

    - by Nutel
    There is a common practice in TDD to write a test before fix to avoid regression and simplify fixing. I just wonder what if the test and fix will be written by different people, total spent time will be almost the same but as now three people will think about possible failures (+tester) we increase probability that fix will cover all possible failure scenarios. Does this practice make sense or it will just waste additional time needed for one more person to familiarize with bug?

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  • In Depth SEO Tutorials Are Ideal For Advanced Students

    There are basic, intermediate and advanced SEO tutorials on offer which will cover subjects such as SEO copywriting, web analysis, keyword research and social media marketing as well as other necessary topics needed to set up a web page. These in depth tutorials are perfect for those who have already attended SEO training classes as well as for beginners. These tutorials are run over a one and two day period and there are also individual three hour sessions offered.

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  • The Seven Sins against T-SQL Performance

    There are seven common antipatterns in T-SQL coding that make code perform badly, and three good habits which will generally ensure that your code runs fast. If you learn nothing else from this list of great advice from Grant, just keep in mind that you should 'write for the optimizer'. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • Chapter 7–Enforced Data Protection

    - by drsql
    As the book progresses, I find myself veering from the original stated outline quite a bit, because as I teach about this more (and I am teaching a daylong db design class in August at http://www.sqlsolstice.com/ … shameless plug, but it is on topic :) I start to find that a given order works better. Originally I had slated myself to talk more about modeling here for three chapters, then get back to the more implementation topics to finish out the book, but now I am going to keep plugging through...(read more)

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  • Sample Code for the SSIS Book

    - by KnightReign
    Yes, I know I’ve been gone for a long time. I haven’t professionally blogged for years. But, the good folks here, Adam and Peter have out of the goodness of their hearts, left my blog around and well, I though I’d check in. Since then, I’ve changed jobs, gotten divorced, bought a few more laptops, bunches of guitars, a snowboard or two, iPads, iPhones, a few cars, travel to India, Europe, Middle East, backpacked Scotland (and still damp), Nepal and all over the US. I’m three roles away from the SSIS...(read more)

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  • Cloning from a given point in the snapshot tree

    - by Fat Bloke
    Although we have just released VirtualBox 4.3, this quick blog entry is about a longer standing ability of VirtualBox when it comes to Snapshots and Cloning, and was prompted by a question posed internally, here in Oracle: "Is there a way I can create a new VM from a point in my snapshot tree?". Here's the scenario: Let's say you have your favourite work VM which is Oracle Linux based and as you installed different packages, such as database, middleware, and the apps, you took snapshots at each point like this: But you then need to create a new VM for some other testing or to share with a colleague who will be using the same Linux and Database layers but may want to reconfigure the Middleware tier, and may want to install his own Apps. All you have to do is right click on the snapshot that you're happy with and clone: Give the VM that you are about to create a name, and if you plan to use it on the same host machine as the original VM, it's a good idea to "Reinitialize the MAC address" so there's no clash on the same network: Now choose the Clone type. If you plan to use this new VM on the same host as the original, you can use Linked Cloning else choose Full.  At this point you now have a choice about what to do about your snapshot tree. In our example, we're happy with the Linux and Database layers, but we may want to allow our colleague to change the upper tiers, with the option of reverting back to our known-good state, so we'll retain the snapshot data in the new VM from this point on: The cloning process then chugs along and may take a while if you chose a Full Clone: Finally, the newly cloned VM is ready with the subset of the Snapshot tree that we wanted to retain: Pretty powerful, and very useful.  Cheers, -FB 

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  • How are people using virtualisation with SQL Server? Part 1

    - by GavinPayneUK
    Allow me to share with you the results of a survey I did about how people are using virtualisation with SQL Server. This is a three part series of articles sharing the results. In December 2010 I did a 10 question survey to see how people were using virtualisation with SQL Server and if they were changing their deployment and management processes as a result. 21 people responded from at least Europe, the US and Asia Pac. It’s not a massive number but it was large enough to see some trends and some...(read more)

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  • Solutions for "Maintenance Mode"

    - by Ka Lyse
    Given a web application running across 10+ servers, what techniques have you put in place for doing things like altering the state of your website so that you can implement certain features. For instance, you might want to: Restrict Logins/Disable Certain Features Turn Site to "Read Only" Turn Site to Single "Maintenance Mode" page. Doing any of the above is pretty trivial. You can throw a particular "flag" in an .ini file, or add a row/value to a site_options table in your database and just read that value and do the appropriate thing. But these solutions have their problems. Disadvantages/Problems For instance, if you use a file for your application, and you want to switch off a certain feature temporarily, then you need to update this file on all servers. So then you might want to look at running something like ZooKeeper, but you are probably overcomplicating things. So then, you might decide that you want to store these "feature" flags in a database. But then you are obviously adding unncessary queries to each page request. So you think to yourself, that you will throw memcached in to the mix and just cache the query. Then you just retrieve all of your "Features" from memcached and add a 2ms~ latency to your application on every page. So to get around this, you decide to use a two tier-cache system, whereby you use an inmemory cache on each machine, (like Apc/Redis etc). This would work, but then it gets complicated, because you would have to set the key/hash life to perhaps 60 seconds, so that when you purge/invalidate the memcached object storing your "Features" result, your on machine cache is prompt enough to get the the new states. What suggestions might you have? Keeping in mind that optimization/efficiency is the priority here.

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  • Which version of Debian are Ubuntu LTS releases based on?

    - by barnac1e
    This answer says: The base of the operating system, Debian, comes in three versions: Stable, Testing and Unstable. Normally, Ubuntu is based on Testing; the LTS releases are based on Stable. That cannot be true then for 12.04 because Debian Stable (Squeeze) is almost going to be old-stable, and it's obvious that the kernel versions in 12.04, packages, etc. cannot have come from Debian Squeeze. So then what other Debian Stable is there for Precise to be based on?

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