Minimal Post Configuration for CentOS

service yum-updatesd stop
chkconfig yum-updatesd off

service avahi-daemon stop
chkconfig avahi-daemon off

service bluetooth stop
chkconfig bluetooth off

service cups stop
chkconfig cups off

service ip6tables stop
chkconfig ip6tables off

service iptables stop
chkconfig iptables off

yum install screen -y
yum install strace -y
yum install ntp -y
chkconfig ntpd on
mv /etc/ntp.conf /etc/ntp.conf.orig

cat > /etc/ntp.conf << EOF
server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org
EOF

chkconfig ntpd on
yum update -y
reboot