The images are stored in repositories for future use.ĭocker containers are widely used in DevOps and niche web hosting. Using this image, we can create one or more containers with the same time zone. NTP service is also configured in that image. To create more Docker instances with the same time zone, we use images.Īfter setting the desired time zone in a Docker container, we exit it and create a new image from that container using ‘docker commit’. Manually changing time zone is not feasible when there are too many containers. The containers created out of this Dockerfile (docker-compose.yml) will have the same timezone as the host OS (as set in /etc/localtime file). volumes: - "/etc/timezone:/etc/timezone:ro" - "/etc/localtime:/etc/localtime:ro" This time zone files of the host machine can be set in Docker volume and shared among the containers by configuring it in the Dockerfile as shown. The desired time zone from this folder can be copied to /etc/localtime file, to set as default time. The directory ‘/usr/share/zoneinfo’ in Docker contains the container time zones available. The data in volumes are persistent and will not be lost during container recreation. To work around this, we use Docker data volumes.ĭata volumes in Docker machines are shared directories that contains the data specific to containers. This ensures that the date would be set whenever the container is restarted.Ī major issue with Docker containers is that the data in the container is not persistent over restarts. We also update the entry point script of the containers to include the timezone settings. The installation command for tzdata package would vary based on the OS image that the container is using. The entry in Dockerfile would look like: RUN echo "Europe/Stockholm" > /etc/timezone RUN dpkg-reconfigure -f noninteractive tzdata And, all commands from the Docker file will be run as the root user. The settings in the Dockerfile would reflect while recreating or adding a new container. To change time in Docker container, the changes can be done in the corresponding Dockerfile. The Dockerfile contains the basic configuration settings for each container. In hosting environment or cases which need too many identical containers to be spun up, the easiest way to manage is using Dockerfile. The time zone data package tzdata needs to be installed in the container for setting this timezone variable.īy configuring an NTP server, we ensure that the time zones in the containers are always synced. docker run -e TZ=America/New_York ubuntu date The timezone of a container can be set using an environment variable in the docker container when it is created. Though the time zone change usually reflects immediately, in some cases, the container needs a restart for the time to change. docker exec -it container-name /bin/bash date +%T -s "10:00:00" The easiest way to change the time in a Docker container is to change the time using ‘date’ command after connecting to the container. docker exec -it container-id cat /etc/timezone To know the timezone configured in a Docker container, the ‘ /etc/timezone ‘ file has to be checked. To know the current time, the ‘date’ command can be used. The time in a Docker container can be changed in 5 ways. Here, we’ll see the different ways to do that. In our role as Server Support Specialists for web hosting companies and infrastructure providers, we provision and manage Docker systems for various business purposes.Ĭhanging time in Docker container configuration is a task we perform as a part of this service. Your customers would want to change time in Docker container to their time zones. Suppose you provide WordPress hosting using Docker containers to customers around the globe.
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