Red Hat OpenShift Development I: Introduction to Containers with Podman and Exam (DO189)

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You should be able to demonstrate these skills and abilities:

Implement images using Podman


Understand and use FROM (the concept of a base image) instruction.
Understand and use RUN instruction.
Understand and use ADD instruction.
Understand and use COPY instruction.
Understand the difference between ADD and COPY instructions.
Understand and use WORKDIR and USER instructions.
Understand security-related topics.
Understand the differences and applicability of CMD vs. ENTRYPOINT instructions.
Understand ENTRYPOINT instruction with param.
Understand when and how to expose ports from a Containerfile.
Understand and use environment variables inside images.
Understand ENV instruction.
Understand container volume.
Mount a host directory as a data volume.
Understand security and permissions requirements related to this approach.
Understand the lifecycle and cleanup requirements of this approach.




Manage images


Understand private registry security.
Interact with many different registries.
Understand and use image tags
Push and pull images from and to registries.
Back up an image with its layers and meta data vs. backup a container state.


Run containers locally using Podman


Run containers locally using Podman
Get container logs.
Listen to container events on the container host.
Use Podman inspect.
Specifying environment parameters.
Expose public applications.
Get application logs.
Inspect running applications.


Run multi-container applications with Podman


Create application stacks
Understand container dependencies
Working with environment variables
Working with secrets
Working with volumes
Working with configuration


Troubleshoot containerized applications


Understand the description of application resources
Get application logs
Inspect running applications
Connecting to running containers



As with all Red Hat performance-based exams, configurations must persist after reboot without intervention.
During the exam you may be required to work with one or more pre-written applications. You will not be required to modify application code however in some cases you may need to utilize supplied documentation in order to produce a new deployment of a given application.

Cílová skupina

Administrators, architects, software developers, and anyone responsible for creating, managing, or using containers, including those who want to demonstrate their understanding of the key concepts and processes underlying the use of containers in modern software.
Developers who wish to containerize software applications.
Administrators who are new to container technology and container orchestration.
Architects who are considering using container technologies in software architectures.
Site reliability engineers who are considering using Kubernetes and Red Hat OpenShift.

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