Redhat Linux - set time zone and time sync

1. Set time zone to 

   /etc/localtime

1. #ln -sf /usr/share/zoneinfo/Hongkong /etc/localtime
2. We also need to update the timezone at /etc/sysconfig/clock
2. update the ZONE entry to: ZONE="Asia/Hong Kong"
3. Check the current time
1. #date
4. ensure NTP server is set
1. #nano /etc/ntp.conf
2. make sure the NTP server IP address inside the config file is correct
5. manually update the time
1. #ntpdate IP_Address
6. enable auto run at startup
1. #chkconfig ntpd on
7. restart the service
1. #service ntpd restart