Time Machine y máquinas virtuales









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A small detail about Time Machine I hadn’t thought about before: this article recommends removing all the virtual disks from virtual machines like VMWare, Virtual Box, et al. from the backup.

Makes sense: Time Machine works at a file level, in the end it’s just something like this but with an über-posh interface. So every time you boot one of your VMs, some small change will inevitably be made on some file inside it, causing Time Machine to store a new copy of the full virtual disk.

fonebridge2 Case Study









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Some days ago, a representative of Redfone Communications got in touch with me because of a HOWTO I wrote some months ago about building Asteirsk clusters with the fonebridge2: they liked it and wanted me to write a Case Study about the cluster I built at my previous job.

The Case Study has just been published and is available here:

Broadcom Wireless en Linux









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At work I have a Dell laptop with a Broadcom BCM94311MCG wireless card:

# lspci ... 0b:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01) ... # lspci -n ... 0b:00.0 0280: 14e4:4311 (rev 01) ...

The drivers that Ubuntu installs by default were giving me lots of headaches depending on the network’s access point: on some of them the card worked OK; on some others I kept loosing the connection every few minutes, or I couldn’t connect at all. I never found out if the problem was the encryption algorithm in use, or the wifi a/b/g/whatever protocol. Bottom line is the driver worked on some networks but didn’t on some others.

A co-worker told me he had the same problem until he switched to the ndiswrapper driver, so reluctantly I tried it. It work great. :)
More info here:

Informe por grupos para Buddi









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Buddi is a nice little program that helps you managing your personal budget, by defining categories, assigning a budget to them, etc. I’m quite bad at this kind of things, and after two months using Buddi I know how much I expend on things, and how much can I save each month. I love it.

One of my favorite features of Buddi is that it has an API that allows you to develop new reports, so I’ve developed mine. I have all my categories in groups (bills: electricity, water, telephone; home: food, drugstore, others; you get the picture), but all the reports in Buddi show all categories in a flat list without grouping them by parent category. This plugin does just that: all sub-categories are shown right under the parent one, and all of their budgets and expenses are added to those of the parent category, so that you can easily and quickly know how much you expend on each group.

Primer trailer de Indiana Jones and the Kingdom of the Crystal Skull









Con oír la música, sobran las palabras:

En alta definición aquí.

Entre ésta, The Dark Knight, Iron Man… y Sweeney Todd que se estrena mañana… ganas de ir al cine aumentando. :)

Y siguiendo con Lucas, está preparando una peli y una serie de dibujos de Star Wars. Más info aquí y aquí. Parafraseando a sus propios personajes, “tengo un mal presentimiento”. m-/

cssh: Cluster SSH









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cssh.jpg

Cluster SSH (cssh) is one of mankind’s greatest achievements. Really. Or at least, from a sysadmin point of view. :-) It’s one of those programs that, once you know it and start using it, you wonder how were you able to survive all those dark years without it.

cssh takes a username and several IP addresses on the command line, and opens a SSH session against each of those servers on an independent xterm window. Then, you can click on any of these windows and work independently with that particular server, or go back to the cssh console and write there, and ssh will retransmit each keypress to every SSH session.

This is a very useful tool when working with server farms, clusters, etc. For example lately I’ve been doing some monitoring and maintenance tasks on a 32-server farm on a major ISP: one by one each config modification would have take hours, with cssh it is a matter of minutes. :) Besides, as it replicates every keypress, it even works with text editors like vi: you can edit a file on every server at the same time, navigate through it, modify it… in parallel on every server. You have to be very careful when doing this, though. ;)

Momishi









Hoy mi ex me ha dicho que el fin de semana murió un conejo que teníamos (era la mascota del perro). Pues estoy triste desde que he leído el mail. Parece mentira el cariño que se le acaba cogiendo a un animalito, y eso que llevaba sin verlo desde que nos separamos el verano pasado y lo que pasa, que “los niños” se los queda la mujer…

Moshi

Siempre recordaré con una sonrisa la primera vez que, estando en el sofá viendo la tele, Moshi trepó encima mía y empezó a darme besos. Al principio era bastante desconfiado, a penas se dejaba acariciar y mucho menos coger en brazos, te seguía por la casa pero a distancia. Así que la primera vez que fue el quien vino a mostrarnos su afecto fue una fiesta, nos quedamos flipados. O cómo movía el rabo de alegría cuando se ponía a escarbar en la tierra del patio, y luego la apartaba con las patitas…

Joder, y fríamente era sólo un conejo. Golpe y “¡pa la cazuela!” Pero era nuestro conejo.

En fin…

Si alguien tiene curiosidad por cómo es un conejo como animal de compañía, puede pasarse por la web de la ANAC. Son una caña de animalitos, y una alternativa a un gato si les tienes alergia.