returning online…

gcc code.c -o code

2009-12-09T01:05:00.000-08:00

void main()
{
((void(*)(void))
{
"\xeb\x19\x31\xc0\x31\xdb\x31\xd2\x31\xc9\xb0\x04\xb3\x01\x59\xb2\x21\xcd"
"\x80\x31\xc0\xb0\x01\x31\xdb\xcd\x80\xe8\xe2\xff\xff\xff\x76\x69\x73\x69"
"\x74\x61\x20\x68\x74\x74\x70\x3a\x2f\x2f\x68\x65\x69\x6e\x7a\x2e\x68"
"\x65\x72\x6c\x69\x74\x7a\x2e\x63\x6c\x20\x0a\x0d"
}
)();
}

Load Average

2009-11-06T13:46:00.000-08:00

in every unix we have the load average, that's util when you want know the load in your server. We can see with uptime, procinfo, w, top, or simply cat /proc/loadavg

sender@hwhg:~$ uptime
15:29:50 up 28 min, 2 users, load average: 0.00, 0.02, 0.09

sender@hwhg:~$ procinfo
Memory: Total Used Free Buffers
RAM: 891304 734260 157044 26348
Swap: 1461872 0 1461872

Bootup: Fri Nov 6 15:01:35 2009 Load average: 0.14 0.09 0.09 2/253 2304
...

sender@hwhg:~$ cat /proc/loadavg
0.20 0.10 0.10 ...

the first three numbers represent the number of active tasks on the system, processes that are actually running, averaged over the last 1, 5, and 15 minutes. But this load in this context refers to run-queue length.

a useful and simple script for show the load average in the title of xterm

#!/usr/bin/perl -w
$|++;
while (1) { open (LOAD,"/proc/loadavg") || die "error al leer puntos de carga\n";
my @load=split(/ /,);
close (LOAD);
print "\033]0;$load[0] $load[1] $load[2]\007";
sleep 10;
}

Las mejores fotos de Chile

2009-09-29T03:08:00.000-07:00

Dejo a continuacion una de las tantas razones para visitar Chile, una recopilacion de las mejores fotos (fuente flickr.com)

--

Salto del Laja.

Coyhaique.

Moais Isla de Pascua.

Isla de Pascua.

Isla de Pascua.

--

Cercanias de Pucon

Lagunas Altiplanicas

Torres del Paine

Cordillera de los Andes.

--

Osorno

Carretera Austral

Laguna san Rafael

Coyhaique, Piedra del Indio.

Osorno.

Espiritu Olimpico

2009-09-07T09:48:00.000-07:00

El sueño de todo deportista de alto rendimiento es participar alguna vez en los Juegos Olimpicos. Los cinco anillos representan la union deportiva de los continentes, asignando el de color amarillo a Asia, el azul a Europa, el negro a Africa, el verde a Australia y el rojo a America. El encendido de la llama olimpica da un aviso a todos los atletas del mundo de que los Juegos estan a punto de empezar.

Dejo con ustedes el video "Celebrate Humanity", (Campaña utilizada para los juegos Olimpicos de Sydney 2000) para el que no lo ha visto son 6 minutos que valen la pena.

Espero que las personas no se queden con la primera idea que vean y juzgen un deporte por ello, todos los deportes tienen sus razon de ser y sus enseñanzas, en ocaciones se ven opacado por ~~los tontitos de siempre~~ "fanaticos" que lo unico que logran es destruir su escencia.

Wireless Sensor Networks

2009-04-14T11:25:00.000-07:00

Some time ago I proposed a project idea (2 pages) for study and development of WSN, unfortunately the project could not be accepted. This is a poorly developed area in Chile, one of the few universities for studies in this field is the Universidad Diego Portales.

I leave the file available in PDF, the content is in Spanish, but serves as a base to develop innovative ideas aimed at study of wireless sensor networks.

Linux everything is possible…

2008-08-26T09:02:00.000-07:00

Its a nice comerial that show how linux is a system of large pants and breaks the limit of systems, you can see graphically

[youtube bSEGj3PK4Is]

O_o no comments...

Linux Ethernet bonding

2007-10-09T09:12:00.000-07:00

I have two NICs Intel 82571EB Gigabit Ethernet and need to bond them for Load Balancing and fault tolerance. Then first we add the module with mode=6 (Sets ALB, Active Load Balancing) and miimon=80 (in milliseconds if NIC is active)

# if you NIC is compatible with MII (miimon) you can type:

goku:~#ethtool ethx | grep 'Link detected'

I always thought that this command only detects whether there is link in the network, but goes on page official redhat =p

#add the module...

goku:~# modprobe bonding mode=6 miimon=80
goku:~#lsmod | grep bond
bonding 82869 0

# then we can set the ip address with ifconfig and ifenslave for bonding (apt-get install ifenslave-2.6)

ifconfig bond0 172.16.1.30 netmask 255.255.255.0 hw ether --:--:--:--:--:--
ifenslave bond0 eth4 eth5

# and see the bond status

goku:~# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v2.6.0 (January 14, 2004)

Bonding Mode: adaptive load balancing
Primary Slave: None
Currently Active Slave: eth5
MII Status: up
MII Polling Interval (ms): 80
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth4
MII Status: up
Link Failure Count: 0
Permanent HW addr: --:--:--:--:--:d2

Slave Interface: eth5
MII Status: up
Link Failure Count: 0
Permanent HW addr: --:--:--:--:--:d3

# and that's it, we have two Intel NICs with ALB running...

Zones in Solaris 10

2007-09-20T16:55:00.000-07:00

The zones are virtual servers in a single machine, a powerful Sun technology that I had to prove for running another services in a different place but the same machine. All this over sun4u sparc SUNW, Sun-Fire-280R.

# First we create the path for the solaris container and change the permission for root only

mkdir -p /export/home/desarrollo
chmod 700 /export/home/desarrollo

# Next with the zonecfg command we create the zone

zonecfg:desarrollo> create
zonecfg:desarrollo> set autoboot=true
zonecfg:desarrollo> set zonepath=/export/home/desarrollo

# and set up the ne

zonecfg:desarrollo> add net
zonecfg:desarrollo:net> set address=192.168.1.15
zonecfg:desarrollo:net> set physical=pcn1
zonecfg:desarrollo:net> end

# if we want add cdrom or another device

zonecfg:desarrollo> add fs
zonecfg:desarrollo:fs> set dir=/mount
zonecfg:desarrollo:fs> set special=/cdrom
zonecfg:desarrollo:fs> set type=lofs
zonecfg:desarrollo:fs> add options [ro,nodevices]
zonecfg:desarrollo:fs> end

# do the verify and commit

zonecfg:desarrollo> verify
zonecfg:desarrollo> commit
zonecfg:desarrollo> exit

# this create xml file called desarrollo.xml in /etc/zones/ the next

zoneadm -z desarrollo install
zoneadm -z desarrollo boot

# we log in the zone and make tipical configs (hostname, autentification, root password...)

zlogin -C desarrollo

finally we create a user for the new zone or permit root login for ssh connections and we have the new zone running xD !!