============
yum install ntp ntpdate -y
chkconfig ntpd on
/etc/init.d/ntpd start
mv /etc/localtime /etc/localtime.bak
ln -s /usr/share/zoneinfo/Asia/Bangkok /etc/localtime
hwclock --systohc
Ubuntu
============
apt-get install ntp
Ubuntu
============
apt-get install ntp
