Publicado en English

Reduce the size of a dynamic VDI file in VirtualBox

I have got a Virtualbox with debian to build up windows machines using unattended. This virtual HD went up to 54Gb but internaly on 28Gb were used. So when I wanted to move out of that machine it took ages. I wonder if there is a easy way to clean up.
Found it.

start with liveCD,
install zerofree ( apt-get install zerofree)
zerofree /dev/sda1

When finish shutdown the virtual machine and execute on the host system:

VBoxManage modifyhd vdi_file.vdi compact

HOWTO: Reduce the size of a dynamic VDI file in VirtualBox


update:  SytemRescueCD have zerofree installed by default as for version 3.1.0

Publicado en English

how to remote syslog using openwrt

If you need to keep an eye and history about what is going on on your router enable remote login with this command:

echo «option ‘log_ip’ ‘’»>> /etc/config/system

Change to your server. Then on your server (linux debian as example) check /etc/default/rsyslog and add «-r» to the default options. you would start getting messages on your system.
Maybe you need to comment it out on this file /etc/rsyslog.conf those options:
# $ModLoad imudp
# $UDPServerRun 514