Comprobar o instalar actualizaciones con yum

Conjunto de scripts que se ejecutan desde el cron para comprobar o instalar actualizaciones mediante yum y enviar los resultados por correo.

El script principal es /usr/bin/yum-check. El script que se ejecuta en el cron es /etc/cron.daily/yum.cron. Los dos scripts recogen información del fichero /etc/sysconfig/yum-check.

/usr/bin/yum-check:

#
# Name:         yum-check
# Author:       Michael Heiming - 2005-03-11
# Function:     Run from cron to check for yum updates
#               and mail results
# Version:      0.7 (initial)
# 2005-03-12    0.8 randomize startup (cron only)
# Config:       /etc/sysconfig/yum

# Pull in sysconfig settings

. /etc/sysconfig/yum-check

maila=${MAILTO:=root}
yumdat="/tmp/yum-check-update.$$"
yumb="/usr/bin/yum"

if ! [ -t ]
then
         num=$RANDOM
         let "num %= ${RANGE:=1}"
         sleep $num
fi

rm -f ${yumdat%%[0-9]*}*

$yumb check-update >& $yumdat

yumstatus="$?"

case $yumstatus in
         100)
                  cat $yumdat |\
                  mail -s "Alert ${HOSTNAME} updates available!" $maila
                  exit 0
;;
         0)
                 # Only send mail if debug is turned on
                 if [ ${CHECKWRK} = "yes" ];then
                 cat $yumdat |\
                 mail -s "Yum check succeeded ${HOSTNAME} zero patches
available." $maila
                 fi
                 exit 0
;;
         *)
                 # Unexpected yum return status
                 (echo "Undefined, yum return status: ${yumstatus}" && \
                 [ -e "${yumdat}" ] && cat "${yumdat}" )|\
                 mail -s "Alert ${HOSTNAME} problems running yum." $maila
esac

[ -e "${yumdat}" ] && rm ${yumdat}

/etc/cron.daily/yum.cron:

# Pull in sysconfig settings

. /etc/sysconfig/yum-check


if [ -f /var/lock/subsys/yum ]; then

         if [ ${CHECKONLY} = "yes" ];then

                /usr/bin/yum-check
         fi
         else
                /usr/bin/yum -R 10 -e 0 -d 0 -y update yum
                /usr/bin/yum -R 120 -e 0 -d 0 -y update
fi

/etc/sysconfig/yum-check:

# yes sets yum to check for updates and mail only if patches are available
# no does enable autoupdate if /var/lock/subsys/yum is available
CHECKONLY="yes"
# defaults to root, leave empty if .forward/alias in place for root
MAILTO=""
# Set to yes for debugging only! You'll get a mail for each run!
CHECKWRK="no"
# Seconds to randomize startup, if running from cron to balance load
RANGE="3600"