Cristi's Thoughts

Prezentarea despre Distributed Computing @Poli

cristi — Sun, 28 Nov 2010 21:22:32 +0000

I presented about distributed systems at the University Politehnica of Bucharest. Here are the slides, with thanks to the inspiration sources all over the web (Mahout presentations, HBase and Hadoop presentations).

Distributed computing poli

Automated deployment of distributed systems

cristi — Thu, 27 May 2010 21:20:58 +0000

There’s a new blog post up on hstack.org – Hadoop and HBase Automated Deployment using Puppet, written by yours truly. It also announces the open-sourcing of the code that we use to deploy a fully distributed system to one or more clusters in a semi-automated manner (we need to push the button )

So, enjoy reading here.

HBase performance post

cristi — Tue, 27 Apr 2010 21:17:46 +0000

My colleague Andrei just posted a great article about HBase performance, complete with numbers and pictures over on http://hstack.org/. If you’re into the all NoSQL movement, you should definetly check it out (and I’m not just saying it because I know him )

Install Gitorious on CentOS 5

cristi — Sun, 13 Dec 2009 18:18:09 +0000

Recently I had to install Gitorious on a CentOS machine. Instructions on how to do this are in a document inside the gitorious code base, but since I needed something repeatable and reliable, I’ve turned to my tool of choice – Puppet.

So I’ve created a Puppet recipe which installs Gitorious behind a Phusion Passenger/Apache setup. You can get it on GitHub, here. The steps you must follow to use this recipe are:

Install the base OS. I’ve tested it on a bare-bones machine, installed via the CentOS-NetInstall iso disk. I then just picked the Base packages and started the install.
Add the Epel repository in order to get rubygems working. There are other ways of doing this (from source, other 3rd party repos) but this is the way I did it.
Install rubygems: yum -y install rubygems git
Install puppet from gem repos: gem install --no-ri --no-rdoc facter puppet
Clone the repo into /etc/puppet:sudo -i git clone git://github.com/civascu/puppet_recipes.git /etc/puppet
Go into modules/gitorious/manifests/init.pp and change the value of $mail_server to match the SMTP server you want.
Run the standalone puppet tool to apply the recipe on the local machine puppet /etc/puppet/manifests/site.pp

That’s it. Just point your browser to http://yourserver/ and you should be greeted by the Gitorious page.
Be aware though, that if you do not set a fully qualified domain name (e.g. server.domain) you won’t be able to login or perform other actions that require a valid session in Firefox.

Get duplicate line shortcut working in Ubuntu

cristi — Sun, 13 Dec 2009 18:05:00 +0000

Problem: The default keyboard shortcut for duplicating lines (ALT + CTRL + Up/Down) does not work
Configuration: Ubuntu Jaunty, Eclipse 3.5

This is caused by the system using the same shortcuts to move to a virtual workspace above and below. Go to System > Preferences > Keyboard Shortcuts and assign a different key combo for the following two actions:
Switch to workspace up
Switch to workspace down
Duplicate lines works again.