Rénich's Blog

howtos

Migración de nubes a gran escala: de VMware a OpenStack con os-migrate y Ansible

31 de mayo de 2026

¿Estás pensando en migrar de VMware a OpenStack y librarte de licencias abusivas? En este artículo te comparto cómo diseñé una arquitectura de migración automatizada utilizando os-migrate y Ansible, pasando de nubes heredadas (RHOSP 16.2) a nubes hiper-modernas basadas en OpenShift (RHOSO 18), resolviendo los retos de mover cargas masivas sin perder la cabeza en el intento.

Howto: install Air XR18's edit software on Gentoo

14 de julio de 2016

Well, I've made the best buy a GNU & Linux user can make when it comes to pro-audio. I got an Air XR18. This product is one of the best of it's kind. The preamps, FX and software are awesome.

Yes, it works fine on GNU & Linux and Android. Here's how …

Crashing your kernel on purpose

15 de febrero de 2016

Ok, that sounds funny, doesn't it? Well, it turns out, sometimes, you want to test your kernel dump or something of the sorts. Here's how to do it:

echo c > /proc/sysrq-trigger

This will, instanly, crash your kernel.

References:

HowTo: Ask questions in Bash?

29 de diciembre de 2015

I've been writing some script to configure some firewall and came up with this way of asking a question in Bash. I hope it helps as an example. Feel free to contribute your own:

#!/usr/bin/env bash

ask() {
    local query=$1

    if ( echo $query | grep -qi password ); then
        read …

HowTo: Fixing Dovecot 2.2 in CentOS 7.2

22 de diciembre de 2015

Warning: If you update dovecot on CentOS 7, it will brake! You need to update one of the config files in order for it to keep working:

# /etc/dovecot/conf.d/15-mailboxes.conf
...

namespace inbox {
    ...
    inbox = yes
    ...
}
...

So, basically, you need to add inbox = yes within the inbox namespace.