Modifying a Container Time-Zone

The default time-zone for any Docker container is UTC. In the case where you want the Docker container's time-zone to be in sync with the host machine's time-zone, you can apply these changes either in the Docker file or in the Docker-Compose YAML file.

Docker containers always use the system clock of the host machine but it sets its time-zone as UTC.

The following steps are an example of changing time zone for an Order Management Server container.

Procedure

  • You can modify a container's time zone with either of the following two ways:
    • This approach can be applied when you have not created any images. Open the $OM_HOME/docker/orchestrator-service-context/5.0.0-LL/Dockerfile in a suitable editor and modify the file as shown: 
      FROM tibco/base:1.0
COPY orchestrator $OM_HOME/orchestrator
ENV TZ-Asia/Kolkata
RUN ln -snf /user/share/zoneinfo/$TZ etc/localtime "echo $TZ > /etc/timezone
RUN chmod -R a+x $OM_HOME/orchestrator/standalone/bin && \
 chgrp -R 0 $OM_HOME/orchestrator && \
 chmod -R g=u $OM_HOME/orchestrator
ENTRYPOINT ["/opt/tibco/om-ll/5.0/orchestrator/standalone/bin/start.sh", "--run=FG"]
EXPOSE 9093

      In this example, the following has been modified: 

      ENV TZ=Asia/Kolkata
      RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ /etc/timezone

      Here you have to change the value of the TZ variable as per your time zone (in the example, the time zone is Asia/Kolkata).

    • This approach can be applied if your images are already created and now you want to change the container time zone at runtime. Open $OM_HOME/docker/docker-compose-run-orchestrator-service.yml in a suitable editor and modify the file as shown: 
      version: "3"
services:
 orchestrator-service:
 image: "tibco/orchestrator-service:${OM_VERSION_TAG}"
 ports:
 - "${HOST_ORCHESTRATOR_SERVICE_PORT}:9093"
 volumes:
 - "${HOST_LOG_ROOT_LOCATION_DIR_PATH}:/opt/tibco/om-ll/5.0/orchestrator/standalone/logs"
environment:
- "TZ=Asia/Kolkata"
command: sh -c "ln -snf /user/share/zoneinfor/$TZ /etc/localtime && echo $TZ > /etc/timezone"

      In this example, the following has been modified: 

      environment:
- "TZ=Asia/Kolkata"
      command: >
  sh -c "ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone"

      Here you have to change the value of the TZ variable as per your time zone (in the example, the time zone is Asia/Kolkata).