Docker 1.0 & RedHat 7

18 June 2014 in Databases, Docker, Hi-Tech, Linux, Red Hat, SQL

I really like this kind of news, new versions of docker and RedHat: Docker 1.0: this is the first stable version after more than one year of development. This version is production ready and I will start using it asap. RedHat 7: this is a good news as the version 6 started to be a little bit old now. What’s new? MariaDB replace MySQL \o/ Docker integrated systemd XFS by default Kernel 3.

PRM: automatic MySQL/MariaDB replication managment

25 April 2014 in Databases, Debian, HA, Hi-Tech, Linux, Red Hat, SQL

The Percona replication manager (PRM) is a framework using the Linux HA resource agent Pacemaker that manages replication and provides automatic failover. This covers the installation of the framework on a set of servers. The PRM framework is made of 4 components: Corosync, Pacemaker, the mysql resource agent and MySQL itself. It’s easy to setup, better if you already know how to use Pacemaker and it works like a charm. In fact it setup a master and x slaves.

Ccze: easily colorize your logs output

28 March 2014 in Debian, Hi-Tech, Linux, Red Hat

Some of you will tell me that most utility is doing it as well. And that’s right, but with ccze you will be able to colorize everything with a pipe. For example when you play with a verbose service like Pacemaker, you need to get colorization if you want to win time. Here is an example: tail -f /var/log/syslog | ccze -A

Ansible: the Puppet outsider!

4 March 2014 in Debian, Hi-Tech, Linux, Puppet, Red Hat

It’s been a while now that I’ve heard of Ansible but I only started playing with a week ago. You may certainly know that I’m a Puppet lover, but this solution is more powerful than Puppet in my opinion. So I started to migrate my personal Puppet to Ansible just to play with. Here are the pros: No client needed on the clients, only SSH! It’s written in Python By default a lot of modules Not only a configuration management tool, it’s an orchestrator too!

Iptables is going to be replaced by NFtables

24 November 2013 in Debian, Linux, Red Hat, Security

If you’re not aware that the next kernel version will replace iptables by nftables, it’s time to learn on how it works, what are the features, why the change and how to use it. If like me, you love PF, you’ll be pleased to find a similar syntax on NFtables ! To have a good introduction on it, look at those slides :

Shell : back to directory command (bd)

19 September 2013 in Debian, Hi-Tech, Linux, Red Hat

I recently read a post (on Korben’s blog) regarding a command called bd to go back to a directory from you current full path. It permits to do more than that ! In fact this is a simple shell script, but it really helps when you’re in a long subfolder list. For example if you reside in ‘/home/user/project/src/org/main/site/utils/file/reader/whatever’ and want to change to ‘/home/user/project/test’, then try ‘bd p`/test. If you want to see all the possibilities, you can look at the main site project.

DRBD : advanced usages

9 September 2013 in Debian, Hi-Tech, Linux, Red Hat

At my work, I taught a DRBD training for advanced usages at work. I produced some slides and I would like to share them : I hope it could help…