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Configuring sendmail using macro’s

Posted on 8 July 2014 | Systems by Jeroen de Meijer

A lot of sysadmins complain that sendmail is way to difficult and that the sendmail.cf file is unreadable. The fact is however, that the sendmail.cf is not designed to be human readable (but optimized for parsing). The correct (and easy) way to configure sendmail is by using macro’s. You define which macro’s you want to …


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Switching files

Posted on 7 July 2014 | Systems by Daniel Schutterop

I can’t even recall how often I copy a file to filename.org and revise the original, just to copy the .org back to its original when my actions fail. Or even worse, copying the modified file to a filename.org.2, copying the filename.org to filename and the filename.org.2 to filename.org. Been there? Way too many actions …


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Automating tasks with Fabric

Posted on 1 July 2014 | Systems by Arjen de Vries

For a client I had to test and setup a new puppet environment. This included reinstalling and configuring the base installation multiple times. To make my life a bit easier i’ve created the fabric fabfile shown below. It’s not that fancy but can make your life a lot easier. I’ve used it on mainly Scientific …


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How to build a docker image based on debain 14.04 LTS with an Nginx webserver

Posted on 11 June 2014 | Systems by Arjen de Vries

In this short tech tutorial i’ll show you how to build a docker image based on debain 14.04 LTS with an Nginx webserver. Of course you an also use an image from the docker repositories, but where’s the fun in that First we’ll need a base image to build our docker image from. You can …


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Custom Directives with AngularJS

Posted on 10 June 2014 | Development by Nouh Lahouel

In this technical report I will show you how to create a custom directive in AngularJS and implement it in your project. The intent of this way of coding is to clean up your HTML sourcecode and make it more readable for developers or other projectmembers. Beside of that your code gets more organized. First …


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What to do if your customer says it needs to be high available

Posted on 10 June 2014 | Systems by Jeroen de Meijer

I hear and see this a lot; the customer just stating that something needs to be high available. But what is high available? If you try to get this clarified it most often still stays unclear as the customer doesn’t really understand what it entails themselves. So, what questions to ask to help the customer …


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Performance tuning – Part 1

Posted on 10 June 2014 | Development by Bastiaan Dressen

In the realm of front-end development, lots of DOM manipulation libraries exist. The most popular library, without a doubt, is jquery. A DOM manipulation library, providing very concise shorthand commands, cross-browser compatibility and a very gradual learning curve. All this, and an extremely large active community, contributed to its high popularity. Can’t have it all …


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Extraordinary Swift Solutions Encountered Noteworthy Tales 1 – Cross Domain XML Feed Workaround

Posted on 7 June 2014 | Development by Isamu Ip

Fluctuating Price The customer has a partnership with another company (partner). When a customer would sign a contract with the company, the partner would provide a discount on a product. The original price and the deducted price should be whoed n. The price of the product fluctuates, so in order not have to change the …


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From free-for-all to coding-in-style: puppet-lint-check

Posted on 7 June 2014 | Systems by Daniel Schutterop

OK. puppet-lint is a very powerful tool, most of us know it and live by its rules. When I started using puppet-lint, it made me feel a bit like my mother, telling me to clean my room. After cleaning up my recipe I treated myself to a nice pat on the back for doing the …


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Distributing a puppet git repo to multiple puppet masters

Posted on 30 May 2014 | Systems by Arjen de Vries

When building a puppet setup with dynamic environments managed with git i needed a way to distribute the central puppet git repo to the multiple puppet masters. There are ofcourse multiple ways to accomplish this, but i wanted my changes to the central repo to be replicated to the masters instantly.To do this i’ve created …


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