Galera Cluster : How to do maintenance and recover

29 July 2013 in Hi-Tech, Linux, SQL

To finish my Galera’s posts, I’ve wrote tips to help on maintenance and recover for the Galera Cluster (in french). As most of the time, Galera is able to manage automatically data recovering, some times (if split brain occurs for example) you need to manually do specific stuffs to recover the cluster. I hope this will help some of you if problems occurs.

Galera Cluster : choose the better SST method

25 July 2013 in Hi-Tech, Linux, SQL

Last month, I’ve wrote a document accessible on slideshare to explain some of basic/advanced features of MySQL/MariaDB. In addition, there were some informations related to Galera Cluster running on top of MariaDB. I’ve updated my documentation to help on choosing the better SST method and understand the differences (in french).

Book : Pro Git

21 July 2013 in Debian, Linux, Mac, OpenBSD, Red Hat, Windows

Git : have you ever tried to play with it ? For several years I’m working with that fantastic tool. Anyway the biggest problem is : if you don’t work day to day with Git, you need a memento or something similar (like my wiki 😉). Also, if you use it for your personal usage, you’ll be lost when you will work with complex workflows. As I’m not a developer, I use Git to manage my etc configuration, my puppet manifests, my custom scripts…so many basic usage that really help me to win time as a sysadmin.

LXC : basic installation and usage

17 July 2013 in Debian, Hi-Tech, Linux

Last week, I started to play with LXC. It is the userspace control package for Linux Containers, a lightweight virtual system mechanism sometimes described as “chroot on steroids”. LXC builds up from chroot to implement complete virtual systems, adding resource management and isolation mechanisms to Linux’s existing process management infrastructure. I wanted to look at an alternative of OpenVZ and LXC seams to be the better solution. That’s why I started to play with.

DRBD : how to recover failed synchronisation

13 July 2013 in Debian, HA, Hi-Tech, Linux

DRBD is an old stable solution to create block disk replications over the network. However in some case, we need to deal with failures for several reasons (hardware, network issues…). I’ve updated my current documentation on this point and hope this will help some of you. You can find the update here.

Vagrant : I finally dropped KVM for VirtualBox

11 July 2013 in Hi-Tech, Linux, Virtualization

A few months ago, I wanted to install as fast as possible new VMs headless. In addition, I wanted to give the possibility for my ex colleagues to be able to easily create remote VMs on my desktop as most of them got slow machines. KVM did the job perfectly. I also needed to quickly deploy Debian, so I made a pressed file. Here at eNovance, I can be selfish :-p as everybody got a fast machine (Thanks eNovance).

Yubikey : protect your desktop authentication using pam and yubikey library

9 July 2013 in Debian, Hi-Tech, Linux, Security

I’ve bought 2 Yubikeys several months ago and didn’t really took the time to play with them. A ex-colleague took that time and configured it on his desktop under ArchLinux. I decided to play with it, see how could it works and with his help, put it in place in a very short time. I configured it to work in parallel of my password. With that configuration, I do not need anymore typing my password, but only need to plug in my Yubikey.

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