All systems related posts
Hybris is a very widely used platform for eCommerce. It is a somewhat complex piece of software, with multiple interacting components.
When trying to obtain optimal performance, there are a few guidelines you’ll need to follow. We’ll review them in this post.
If you’ve been wondering how to delete a package you mistakenly installed (or which is no longer needed) along with all its dependencies, here’s a neat way to achieve just that.
The idea is that whenever you use yum to perform some operation on packages, a transaction is created. If you installed a package along with its dependencies, then you can undo just that by undoing that transaction.
Continue reading Linux RedHat / CentOS / Fedora : Uninstall a package along with dependencies
If you feel like running a full bitcoin node on your Fedora Linux server (and it’s a great way to help the bitcoin network if you have spare capacity / bandwidth), you’ll need to update the firewalld rules in order to allow foreign nodes to connect to yours.
Here’s how…
Continue reading Fedora 20 Linux + bitcoind : Setting up firewalld for running a full bitcoin node
Creating an image in Docker is rather easy and well documented.
You start by editing a file which describes the image, then run a few commands, and voilà.
In this post we’ll cover how to create a very basic Docker image which will let us spawn elasticsearch instances very easily.
Continue reading Docker 101 : Creating an Elasticsearch image
The goal of this tutorial is to show you how to create an encrypted LVM on Linux. This will help you keep your data safe in the event of, for example, your laptop computer being stolen.
Here are a couple of pointers to perform an installation of OpenBSD on a media which will be read-only most of the times. I hope I didn’t forget anything otherwise I’ll be in trouble next time I reinstall… 🙂
Continue reading OpenBSD : Read only Compact Flash installation
Or why you usually use ls -l *txt without quotes, but use quotes in find . -name "*txt".
Continue reading Unix 101 : Shell wildcards expansion, to quote or not to quote
A non-printing character is a character which won’t actually get directly printed (or displayed) but rather interpreted. Such non-printing characters are for example line-feed or tabulation. The interpretation of those characters can differ from one system to the next. For example the line-feed character is different on Unix or DOS.
If you need an easy way to confirm that a text file is DOS or UNIX formatted (they differ with respect to the end of line character(s) for example) or if you wish to display normally non-printing characters of a text file, you can use the -vET command line switches of the cat utility.
As explained in the man page :
For example : Continue reading Unix 101 : Showing non-printing characters in text files (ex : DOS files)
This post is meant to clarify a few key concepts about Unix filesystems such as directory permissions, hardlinks and symlinks.
Continue reading Unix 101 : Filesystem basics & Special files
In this post I’ll revisit the classical “how to remap caps lock into something useful” once again. In this post, I’ll show how to remap the caps lock key to have an extra Escape key, which is very useful for all VI/Vim users.
Continue reading Linux + Xorg : Remapping caps lock key to escape