Today I have assisted to the Ubuntu Cloud Webcast, Presented by: Mark Shuttleworth (Canonical Founder) and Stephen O’Grady from Redmonk.
Enjoy!
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Ubuntu Cloud Webcast and service orchestration
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Category Archives: Linux
Backing up a cpanel hosting account
Since 2005 I have a hosted this web page in the Cpanel based Bluehost company. First with Joomla and recently migrated to WordPress.
Bluehost allows to download a daily, weekly and monthly backup from your Cpanel control panel, but manual intervention is needed:
- Logon in the control panel
- Navigate to the backup page
- Perform the backup
- Download it to your local computer.
This is a manually/time consuming task and of course you should not forget it!!
In this post I gonna show my automatic method to backup files and databases using:
- Crontab for automatic backups.
- Public/private keys for passwordless ssh connections.
- Mysqldump for dumping the MySQL databases to a local file.
- Rsync command for synchronizing directories between remote and local servers. This way bandwidth is reduced as if a file has already been copied to the local server no data transfer is needed.
- SpiderOak for data deduplication and remote backup.
Some previous knowledge is needed to understand how it works, anyway there are some useful links to understand it. 
Debian Templates Disk Images Qemu/KVM for libvirt
A long time ago, in a galaxy far far away when I started with openvz I followed this tutorial for Debian template creation. Now I am adapting it (using my own experience and this template-squeeze tutorial too) to Qemu/KVM disk images than later can be used directly or via libvirt.
This procedure tries to generalize the template. While working with disk cloned images many elements need to be “generalized” before capturing and deploying a disk image to multiple computers. Some of these elements include:
- ssh keys
- /etc/apt/sources.list
The more “generalized” is a template, the less manual work is needed after deploying it.
This method must work in others virtualization systems: vmware, virtualbox, etc. As it is “virtualizator/hypervisor/emulator independent” as it is focused only in the disk image.
Installing Puppet master and client in the same host. The Debian way
Since I started learning puppet several weeks ago I wanted to install the client and the server in the same host but using several aliases for the same machine. But there are several funny error related to puppet master and client sharing the same ssl directory: SSL certificate confusion, obscure errors, and SSL revocation horrors.
I took the main ideas from Splitting puppetd from puppetmaster from madduck‘s blog. But using this method you don’t have to create 2 differents ssl directories. Both installations (client and server) will share the same directory. I think it’s easier to implement and maintain.
The golden rule is to create all the SSL stuff (CA, keys, certificates,etc) in the right moment. And you may ask… When is the right moment? After the file /etc/puppet/puppet.conf is created with the certname directive properly updated. As by default puppet create all the SSL stuff using the hostname instead of the alias you want.
This tutorial assume you are using Debian (but should work on its derivatives: Ubuntu, Mint, etc) and have one server with two aliases replying to the same host (via /etc/hosts or DNS) In my case: puppet (server) and mediacenter (client).
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Migration from Joomla to WordPress succesfully done!
Last week I finally finished the migration from my old 1.0.15 Joomla installation to the new shiny 3.2.1 WordPress. I had in mind to migrate to the new 1.5.X Joomla series but there was not an easy one-click upgrade tool as there was so many core differences between version and some manual work had to be done. That was the reason to study other options.
Finally I decided to move on with WordPress and with the help of Misterpah‘s Mambo Importer plug-in at least half of the work was already done. Although some manual work has to be done (recreating path’s, images, etc) 
Special thanks to Misterpah for sharing his knowledge and time!
P.S.: Starting from today all (or at least almost) news posts/pages will be written in English.
Como encontrar un servidor en un CPD
Si bajas a menudo a un CPD porque tienes que hacer algo en algún servidor (patching, cambio de cinta, cambio de disco duro, etc) te habrá pasado alguna vez que no encuentras el servidor en el CPD.
Con este pequeño truco podrás encontrarlo fácilmente a ritmo de Axel Foley 
Linux – Acceso al diccionario de la RAE desde la consola shell de Linux
Alguna vez te habrá pasado que no tienes un diccionario de castellano a mano cuando te hace falta. Con este sencillo script, puedes consultar el Diccionario de la Real Academia Española de la lengua desde tu consola favorita.
Instalando Debian GNU/Linux con LVM+RAID1 en una maquina virtual emulada QEMU
Alguna vez has querido hacer pruebas, practicas con un sistema operativo instalado sobre RAID por software + LVM (Volumenes Lógicos) y no tienes ningún equipo libre para hacer pruebas. Instala una Debian LVM+RAID1 en una maquina virtual emulada usando Qemu.
Instalando Debian GNU/Linux con LVM+RAID1 desde el instalador (debian-installer)
Con las antiguas ISOs de instalación, teníamos que hacer instalación normal en un disco, añadir otro disco, configurar el RAID1 por software y sincronizar los 2 discos. Ahora podemos hacerlo de una sola vez. El nuevo instalador (debian-installer) nos permite instalar desde cero una maquina con RAID1 por software y volúmenes lógicos LVM.
Qemu – Imagen i386 qcow Debian GNU/Linux 4.0 (etch) utilizable desde qemu
Hace poco tiempo que descubri el proyecto FreeOsZoo. Basicamente es un repositorio de imagenes QEMU de sistemas operativos libres. Desde la pagina del proyecto FreeOsZoo incluso podemos probar algunas de estas imagenes QEMU online antes de descargarnos un monton de MB o incluso GB.
Como tenia pensado realizar un par de tutoriales sobre aplicaciones, servidores, redes usando imagenes QEMU y debian, me he decidido a hacer una imagen qcow para qemu segun las especificaciones de la pagina del proyecto FreeOsZoo de mi distribucion linux favorita: Debian.