Yosemite and Refind: recover your Linux boot

22 October 2014 in Debian, Hi-Tech, Linux, Mac, Red Hat

You may upgrade your Mac OS X version to Yosemite (10.10) and saw you dual boot with Linux not working anymore :-(. That’s because Apple made changes and Refind is not yet ready for it. So here is the solution to get your dual boot half back. It won’t fully work as expected, but you’ll be able to boot to Linux with Refind and Mac OS X with the alt key.

Tig: browse your Git repositories in curses

16 October 2014 in Debian, Hi-Tech, Linux, Red Hat

A colleague talked to me about this tool this week and I felt in love. It helps to easily navigate into your git repository. You can have a look on last log and directly in the same interface the diff of the current commit. I’ve attached one screenshot to let you see how cool it is. The are also a lot of other features but just for browsing purpose. You can’t update or make changes.

Fig: use docker to create a containers’ stack

14 October 2014 in Debian, Docker, Hi-Tech, Linux, Red Hat

Fig is a fast, isolated development environments using Docker. For some features, it can be compared to Vagrant where the Dockerfike is not enough powerful to build multiple instances. For example, let’s say you want to test a new product version of a software like MediaWiki and you want to build the complete stack. So you may need to have several tools categories (depending of the usage): Web: Nginx, PHP-FPM, Varnish App Cahing: Redis Search: ElasticSearch In Vagrant you can natively build 3 VM and interconnect them without the need of additional tool.

Aptly: swiss army knife for Debian repository management

12 October 2014 in Debian, Hi-Tech, Linux

I recently discover Aptly which permit to manage local Debian repositories. I waited this kind of tools during several years and now I’m really happy. It is able to manage several repositories, making snapshots, merging snapshots, diff between 2 snapshots, filtering packages to avoid downloading unwanted ones…. This is perfect when you want to test before upgrading a critical infrastructure.

FIO: Bench IO disks

6 October 2014 in Ceph, Debian, Hi-Tech, Linux, Red Hat

The first thing you generally want to do when you have any new Storage system like SSD, Disk arrays or a Cluster Ceph, is benching. You will want to know how can read and write throughput. FIO is able to do that for you, here is an example: [global] ioengine=libaio invalidate=1 ramp_time=5 direct=1 size=5G runtime=300 time_based directory=/home [seq-read] rw=read bs=64K stonewall [rand-read] rw=randread bs=4K stonewall [seq-write] rw=write bs=64K stonewall [rand-write] rw=randwrite bs=4K stonewall You then will have a good output of everything you need to know.

Netflix: testing it and feedbacks

28 September 2014 in Cinema, Hi-Tech, Others, Private life

Like me you may heard of Netflix for the first time a few months ago because of the announcement in Europe. However it’s a massively used solution in the US since several years. Today Netflix is out and you can freely have a month to discover Netflix. For the moment there are not a lot of films and series, but enough in my opinion to be an interesting solution. Of course because of the French laws, films are more than 3 years old and I hope this will change or I’m not sure it will be competitive enough.

MariaDB book on High Performances is finally out! :-)

24 September 2014 in Books, Hi-Tech, Others, Private life

The day has finally come! After several months of intensive work (weekends and nights), I’m proud to announce that my book on MariaDB High Performance is out! In that book, I made my best to make things as simple as possible to test features, test solutions and to explain everything in the simplest way. Of course if you’re a beginner on MariaDB (and Linux), it may be hard. But if you’re familiar with basics and want to go further with performances and high availability on MariaDB, you’ll enjoy it.