Servidores centros secundaria

Configura los workstations con la swap tirando de memoria RAM antes que la swap de disco.

Esto hace que todos los procesos de I/O sean mucho más rápidos.

Se intenta gestionar más eficientemente el uso de la swap.

Por defecto la configuración de ramzswap es la siguiente:

memoria_total /2 / num_cpus (para equipos con 1 Gb y 2 cpus 2 swap de ram de 256 Mb).

Autor: Oscar Vaquero (Administración SI)

Modificación de los scripts para adaptarlos a cualquier sistema,

creación de tarea puppet y pruebas.

Francisco Rodrigo López

IES Javier García Téllez (Caceres).

INSTRUCCIONES DE INSTALACION DEL MODULO

---------------------------------------

Desempaquetar en /etc/puppet/modules.

Incluirlo en clase-especifica.pp

class ramzswap_kernel3 {

file { "/root/ramzswap" :

owner=>root, group=>root, mode=>644,

ensure => directory,

}

file { "/etc/init.d/ramzswap.sh" :

owner=>root, group=>root, mode=>755,

source=>"puppet:///modules/ramzswap_kernel3/ramzswap/ramzswap.sh",

notify=> Exec ["crea-enlaces-ramzswap"],

}

file { "/root/ramzswap/desactiva.sh" :

owner=>root, group=>root, mode=>755,

source=>"puppet:///modules/ramzswap_kernel3/ramzswap/desactiva.sh",

require => File ["/root/ramzswap","/etc/init.d/ramzswap.sh"],

}

file { "/root/ramzswap/inicializa.sh" :

owner=>root, group=>root, mode=>755,

source=>"puppet:///modules/ramzswap_kernel3/ramzswap/inicializa.sh",

require => File ["/root/ramzswap","/etc/init.d/ramzswap.sh"],

notify => Exec ["crea-enlaces-ramzswap"],

}

exec { "crea-enlaces-ramzswap" :

path => "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",

command => "update-rc.d ramzswap.sh defaults",

require => File ["/etc/init.d/ramzswap.sh"],

unless => "ls /etc/rc2.d/S??ramzswap.sh",

}

}

#! /bin/sh

### BEGIN INIT INFO

# Provides: inicializa.sh

# Required-Start:

# Required-Stop:

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: inicializa la ramzswap

### END INIT INFO

get_number_of_present_cpus() {

cpulist=$( cat /sys/devices/system/cpu/present | tr ',' ' ' )

local num_cpus=0

for item in $cpulist; do

if ( echo $item | grep --silent '-' ); then

greater_cpunum=$( echo $item | cut -d '-' -f 2 )

lesser_cpunum=$( echo $item | cut -d '-' -f 1 )

local num_cpus=$(( $num_cpus + $greater_cpunum - $lesser_cpunum + 1 ))

else

local num_cpus=$(( $num_cpus + 1 ))

fi

done

echo $num_cpus

}

# get the number of CPUs

num_cpus=$(get_number_of_present_cpus)

# set decremented number of CPUs

decr_num_cpus=$((num_cpus - 1))

# get the amount of memory in the machine

mem_total_kb=$(grep MemTotal /proc/meminfo | grep -E --only-matching '[[:digit:]]+')

mem_total=$((mem_total_kb * 1024))

# determine modprobe parameter name, depending on kernel version

if (uname --release | grep -E --silent "^3\.[123]"); then

num_devices_parameter='zram_num_devices'

else

num_devices_parameter='num_devices'

fi

# load zram modules

modprobe zram $num_devices_parameter=$num_cpus

# initialize the devices, set total size to 1/2 RAM

for i in $(seq 0 $decr_num_cpus); do

echo $((mem_total / 2 / num_cpus)) > /sys/block/zram$i/disksize

done

# Creating swap filesystems

for i in $(seq 0 $decr_num_cpus); do

mkswap /dev/zram$i

done

# Switch the swaps on

for i in $(seq 0 $decr_num_cpus); do

swapon -p 100 /dev/zram$i

done

#! /bin/sh

### BEGIN INIT INFO

# Provides: desactiva.sh

# Required-Start:

# Required-Stop:

# Default-Start:

# Default-Stop: 0,1,6

# Short-Description: desactiva la ramzswap

### END INIT INFO

for device in $(grep -E --only-matching '/dev/zram[[:digit:]]+' /proc/swaps); do

swapoff "$device"

done

# remove module, wait instead of failing if it's busy

rmmod --wait zram

#! /bin/sh

### BEGIN INIT INFO

# Provides: ramzswap.sh

# Required-Start: $remote_fs $syslog $all

# Required-Stop:

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: inicializa la ramzswap

### END INIT INFO

set -e

PATH=/sbin:/bin:/usr/sbin:/usr/bin

. /lib/init/swap-functions.sh

case "$1" in

start|"")

# Activa ramz

/root/ramzswap/inicializa.sh

;;

restart|reload|force-reload)

echo "Error: argument '$1' not supported" >&2

exit 3

;;

stop)

# Desactiva ramz

/root/ramzswap/desactiva.sh

;;

*)

echo "Usage: ramzwap.sh [start|stop]" >&2

exit 3

;;

esac

exit 0