Archive

Archive for February, 2013

Running Puppet in Client/Server Mode

February 20th, 2013 1 comment

In my last post, I introduced how to run a very simple HelloWorld script with Puppet 3.1.0 on CentOS 6.3. Although it shows how Puppet works, it’s not really how Puppet is used in real world. To get the most out of Puppet, you want to run the client/server mode where you have a master and many agents.

Part 1: Install Puppet server

Categories: Cloud Computing Tags: , , ,

Running Puppet HelloWorld on CentOS 6.3

February 12th, 2013 5 comments

Puppet is a very well-known configuration management tool that has been adopted by many enterprises and service providers. VMware recently invested $30M in Puppet Labs, the company behind it. It’s clear that VMware needs such a tool if it wants to grow in data center space.

I actually got a book from last year’s PuppetConf in San Francisco and browsed through it on my flights. As with any other technology, reading it does not mean getting it. To get my hands dirty, I played with it in my home lab last week.

Categories: Cloud Computing Tags: , , ,

How to Use GIT Java APIs to Diff Two Different Files

February 11th, 2013 1 comment

In my previous post, I introduced a sample showing how to use JGIT Java APIs to diff two versions of a same file in repository. The JGIT Java APIs can do more than that – it can actually diff two text files that are not even controlled by GIT.
Here is a short sample code on how to do this. Again, it’s not the main use case for the JGIT APIs. After all, it’s mainly for GIT source control system itself. You can always use other diff APIs for this purpose. However, if you already have JGIT included, this can be handy.

Categories: Software Development Tags: ,

How to Use GIT Java APIs to Diff Different Versions

February 3rd, 2013 5 comments

Last week I introduced the JGIT Java API with a simple sample illustrating how to read content from HEAD. If you have multiple versions of a source code or text file, you may want to see their differences. An easy tool for this is the standard diff.

The JGIT Java API has built-in support for you to generate diff between any two versions of a file, be it a source code, properties file, XML file, or any other text files. Here is a sample that shows how to do this.

Categories: Software Development Tags: ,