14 May
2013
Cloud
By Alen Komljen

OpenStack Ceph integration

Maybe most interesting part about Ceph is integration with OpenStack. So I will show that before moving forward to Ceph RadosGW. Before going through below instructions of OpenStack Ceph integration I assume that you have Ceph cluster up and running (Bobtail -> ) and OpenStack (Folsom -> ). Ceph uses block devices with OpenStack through [...]

Read More
11 May
2013
Storage
2 Comments
By Alen Komljen

CephFS filesystem

CephFS is only component of Ceph storage system that isn’t quite ready for production. However you need to give a try to that component. Ceph filesystem can be mounted on client in two ways: As a kernel driver With FUSE So first on your Ceph cluster you need to add separate pool and key to [...]

Read More
08 May
2013
Storage
By Alen Komljen

Ceph upgrade from Bobtail to Cuttlefish

I normally try to post new article once a week, but this will be exception as new Ceph stable version is released. So instead of writing about CephFS here you will see Ceph upgrade instructions from Bobtail v0.56.x to Cuttlefish v0.61. Here are release notes: Ceph Cuttlefish As you can see from release notes there [...]

Read More
03 May
2013
Storage
5 Comments
By Alen Komljen

Ceph storage system

Currently maybe the most popular open distributed storage solution. I’m using it with OpenStack for block and object storage, for NFS and like S3 compatible storage. I can just tell that I’m very impressed about capabilities it have and I can highly recommend it for large scales deployment. Here I will start with installation instructions [...]

Read More
25 Apr
2013
Virtualization
By Alen Komljen

Lightweight virtualization with LXC

It’s been a long time since my last post. Now I’m working with more interesting technologies, cloud related, so you will probably see more about that. To be more precise: OpenStack, Ceph, Juju, SaltStack, AWS, etc. But first things first, here I will talk about Linux containers and lightweight virtualization with LXC. Also I will [...]

Read More
13 Jan
2013
Testing, Useful tips
1 Comments
By Alen Komljen

HTTP Load testing with JMeter

In previous post I wrote that for high availability load balancing with HAProxy and CARP on FreeBSD I used JMeter as a testing tool. In this post I will show some basics and how to use it for HTTP load testing. JMeter is an Java application that can be used to simulate a heavy load [...]

Read More
03 Jan
2013
Load balancing
6 Comments
By Alen Komljen

High availability load balancing with HAProxy on FreeBSD

To achieve high availability load balancing with HAProxy on FreeBSD you can use Common Address Redundancy Protocol (CARP) to setup backup node and using that configuration avoid single point of failure (SPOF). Basic idea about CARP is that CARP allows multiple hosts to share the same IP address. It is a free, non patent-encumbered alternative [...]

Read More
30 Dec
2012
Useful tips
By Alen Komljen

Search country domains using Google

Here is small research that I did two months ago to search country domains using Google for my country TLD, “.ba”. I already wrote about Getting http response headers with python which is basically result of script that will be shown here. Approach that I used is without using Google API, so I just used [...]

Read More
23 Dec
2012
Development, Useful tips
3 Comments
By Dario Duvnjak

Setting up a Ruby development environment on Mac OS

In order to get a Ruby development environment set up on (a freshly installed) Mac OS, here are the steps you need to go through: XCode XCode is required because it comes with all the necessary libraries needed to build software on OS X (most importantnly native Ruby gems). Install XCode via the App Store. [...]

Read More
23 Dec
2012
Cloud
By Alen Komljen

Running Joomla on OpenShift for free

My first post was running WordPress on OpenShift, so for all Joomla users I decided to show how easily you can get running Joomla on OpenShift for free also. I assume that you have OpenShift account and you read my first two posts if you are new with all of this. For Joomla there is [...]

Read More