How to make sure docker's time syncs with that of the host?
I have dockers running on Linode servers. At times, I see that the time is not right on the dockers. Currently I have changed the run script in every docker to include the following lines of code.
yum install -y ntp
service ntpd stop
ntpdate pool.ntp.org
What I would ideally like to do however is that the docker should sync time with the host. Is there a way to do this?
Answer
The source for this answer is the comment to the answer at: Will docker container auto sync time with the host machine?
After looking at the answer, I realized that there is no way a clock drift will occur on the docker container. Docker uses the same clock as the host and the docker cannot change it. It means that doing an ntpdate inside the docker does not work.
The correct thing to do is to update the host time using ntpdate
As far as syncing timezones is concerned, -v /etc/localtime:/etc/localtime:ro works.