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Tomcat Clustering Series Part 1 : Simple Load Balancer
I am going to start new series of posts about Tomcat clustering. In this post we will see what is the problem in normal deployment on a single machine, what is clustering and why is ...
Health Checks, Run-time Asserts and Monkey Armies
After going live, we started building health checks into the system – run-time checks on operational dependencies and status to ensure that the system is setup and running correctly. ...
Distributed Apache Flume Setup With an HDFS Sink
I have recently spent a few days getting up to speed with Flume, Cloudera‘s distributed log offering. If you haven’t seen this and deal with lots of logs, you are definitely missing ...
Install Cloudera Manager 3.7.5 Free Edition
I recently installed Cloudera Manager Free Edition on my test cluster. I ran into a few problems during install so hopefully this will help you with your troubles.Cloudera Manager Free ...
Intro to Chef
Chef is an incredible tool, but despite its beginnings in 2008/2009 it still lacks an effective quick start, or even an official “hello world” – so it takes too long to really ...
5 things I learned from a Hacker attack
On Friday evening I got an e-mail from my provider. They told me my webspace was subject of a hackers attack and they would shut it down until they have analysed its root cause. There ...
Business Agility Through DevOps and Continuous Delivery
The principles of Continuous Delivery and DevOps have been around for a few years. Developers and system administrators who follow the lean-startup movement are more than familiar with ...
Puppet: From Imperative to Declarative System Configuration
After my impromptu presentation about configuration management with Puppet at BarCampGR a few weeks ago, several people mentioned that they had tried to use Puppet before, but couldn’t ...
Standalone Puppet with Capistrano
Mike English and I frequently make use of Puppet to provision servers and manage server configurations. It is very convenient to be able to setup a server (while simultaneously documenting ...
Devops and Maintenance go together like Apple Pie and Ice Cream
One of the things I like about devops is that it takes on important but neglected problems in the full lifecycle of a system: making sure that the software is really ready to go into ...
