How to sync your cloud with Amazon AWS time by chrony?

For Ubuntu, use apt-get. For REDHAT/CENTOS, use yum. 

1. Remove ntp if it is installed.

2. Install chrony and edit chrony.conf

root@myserver:~# apt-get -y install chrony

root@myserver:~# vim /etc/chrony/chrony.conf

3. Comment out the default servers, and add amazon server

server 169.254.169.123 prefer iburst

4. Restart chrony

root@myserver:~# /etc/init.d/chrony restart