Docker: how to sync date between a CentOs host and a Debian container?

Question

I have a CentOs host running a docker Debian container.

The container has the wrong localtime and timezone: how can I synchronize it with the host date?

I'm trying with mounting volumes on the docker-compose with /etc/localtime but it doesn't work.

The solution I prefer should be one of them:

• set a particular ENV in the Dockerfile
• mount properly volumes in the docker-compose.yml

Answer 1

You can add your local file /etc/localtime as volume in your docker-container. Update your docker-compose.yml with the following lines.

volumes:
    - "/etc/localtime:/etc/localtime:ro"

And, Then:

# docker-compose up -d

Now the container time is the same as on your host.

Answer 2

I have found the solution.

In the Dockerfile, write:

ENV TZ=<your timezone>

Example:

ENV TZ=Europe/Rome

Answer 3

You shoudl define has an ENV the TZ and also add change the localtime softlink and place it in the timezone file:

ENV TZ=Europe/Lisbon
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone