Solve the problem of 8 hours difference between docker container and host machine

When using docker-compose for deployment, the output logs and related events are verified and output, resulting in an 8-hour difference between the events and reality.

Troubleshooting:

1. Check the host time:

# View the time date
Wed Sep 29 11:12:44 CST 2021
# Check the time zone date -R
Wed, 29 Sep 2021 11:13:34 +0800

2. Enter the container to view the time

# View all containers docker ps -a
# Enter the container docker eec -it [container ID] /bin/bash
# View the time date

At this time, the host time is the same as the docker container time. After searching Baidu, I finally realized that it was a timezone problem.

Linux time:

Container time:

Cause: The host machine has a time zone set, but the Docker container has not, resulting in an 8-hour time difference between the two.

CST should refer to (China Shanghai Time, Eastern Time Zone 8)
UTC should refer to (Coordinated Universal Time, standard time)
Therefore, the difference between these two times should actually be 8 hours.

Therefore, the time zones of the two must be unified

Solution:

1. Docker-compose configuration volume mount

volumes:
      - /usr/share/zoneinfo/Asia/Shanghai:/etc/localtime

2.Dockerfile runs the command and outputs the corresponding time zone to timezone

RUN echo "Asia/shanghai" > /etc/timezone
 
RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

3. Delete the container and rerun

#Delete docker rm [container ID]
# Start docker-compose -f [file name] up -d

Summary: The 2-hour time difference is caused by the /etc/timezone problem in the container. You can set the corresponding time zone.

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