Docker Container Best Practices

External

• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html/getting_started_with_containers/get_started_with_docker_formatted_container_images#creating_docker_images
• https://docs.docker.com/develop/dev-best-practices/
• https://medium.com/@nagarwal/best-practices-for-working-with-dockerfiles-fb2d22b78186
• http://docs.projectatomic.io/container-best-practices/
• https://containerjournal.com/2016/03/21/5-docker-best-practices-follow/
• https://it.artindustrial.com/2017/09/20/10-best-practices-for-creating-good-docker-images/
• https://developers.redhat.com/blog/2016/02/24/10-things-to-avoid-in-docker-containers

Internal

• Docker Concepts

Reference

• Docker.com Dockerfile best practices: https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices

Document Images

Methods to Document Images

• Logging

• Metrics

• Storage

• Operations

• Upgrades

Java in a Container

Java in a Container

Fail Early

Check the environment configuration and fail early in the ENTRYPOINT script:

 #
 # check the environment and fail early, when the container executed for the first time
 #
/opt/dsmanager/bin/dsmanager check-configuration || { echo "dsmanager configuration error" 1>&2; exit 1; }

/opt/dsmanager/bin/dsmanager check-configuration must exit with a non-zero value if the configuration fails.

To Process

• Principles of Container-Based Application Design by Bilgin Ibryam https://www.redhat.com/cms/managed-files/cl-cloud-native-container-design-whitepaper-f8808kc-201710-v3-en.pdf
• Ten Layers of Container Security https://www.redhat.com/en/resources/container-security-openshift-cloud-devops-whitepaper
• "Container Design Principles" in https://www.infoq.com/articles/kubernetes-effect