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DevOps

SSH Tunneling Explained

Recently I wanted to set up a remote desktop sharing session from home pc to my laptop. While going through the set up guide I came across ssh tunneling. Even though there are many articles on the subject still it took me a considerable amount of googling, some experimenting and couple of Wireshark sessions to grasp what’s going under the ...

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High Availability for Web applications

As more mission critical applications move to the cloud, making the application highly available becomes super critical. An application not available for whatever reason, web server down, database down etc mean lost users, lost revenue that can be devastating to your business. In this blog we examine some basic high availability concepts. Availability means your web application is available to ...

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Observations on Dev / Ops culture

I am and always will be a student of leadership & design. I like to see things work, but I like it more when things work a little better or a little different than I’ve seen them work in the past. More than anything I like change, which I think of as progress when the goal is learning and improvement. ...

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Ubuntu: Installing Apache Portable Runtime (APR) for Tomcat

After reading “Introducing Apache Tomcat 6? presentation by Mladen Turk I decided to enable Apache Portable Runtime (APR) native library for Tomcat. It was supposed to be as easy as sudo ./configure sudo make sudo make install but as you may guess, it was a little bit more than that. 1. Installing Apache APR. “Most Linux distributions will ship packages ...

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Devops: How NOT to collect configuration management data

Hi all, Willie here. This time we’re going to step away from the keyboard and get architectural. But no ivory towers here. In my next two blog posts, I’m going to give you something that will get you out of lots of pointless meetings. Got your attention yet? Good! If you’re in devops, one of the things that you have ...

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Devops has made Release and Deployment Cool

Back 10 years or so when Extreme Programming came out, it began to change the way that programmers thought about testing. XP made software developers accountable for testing their own code. XPers gave programmers practices like Test-First Development and simple, free community-based automated testing tools like xUnit and FIT and Fitnesse. XP made testing cool. Programmers started to care about ...

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GlassFish Response GZIP Compression in Production

A lot has been written about this and this basically should be common knowledge, but talking to different people out there and looking at the efforts Google takes to improve page speed it seems to me that the topic is worth a second and current look. The basics HTTP compression, otherwise known as content encoding, is a publicly defined way ...

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Getting to know the ‘hosts’ file

We had a lecture on DNS today in class and I thought I’d write something about the built-in domain name mapping file present in all of our computers. This file is a very interesting one. You get a lot of uses from it and at the same time it exposes you to a lot of security threats. But before going ...

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