Red Hat Certified Specialist in Containers – EX188 Practice Test
Build your confidence for Red Hat Certified Specialist in Containers – EX188. Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
Try a sample questionExam overview and details
The Red Hat Certified Specialist in Containers - EX188 exam is a performance-based certification that validates your ability to deploy, manage, and troubleshoot containerized applications using Red Hat OpenShift Container Platform. This hands-on exam requires candidates to complete real-world tasks in a live OpenShift environment, testing practical skills rather than theoretical knowledge. It is designed for developers, site reliability engineers (SREs), and system administrators who need to build, deploy, and manage containerized workloads on Red Hat's enterprise Kubernetes platform. By passing this exam, you demonstrate competency in core container operations, including creating and managing container images, deploying applications, configuring networking and storage, implementing security controls, and monitoring application health. The certification proves you possess the operational skills required to support containerized applications in a production-grade OpenShift environment.
Sample Questions
Choose an answer and explore the explanation to see how practice works.
sam needs $name to restart after a host reboot without manual intervention on a RHEL 9 workstation. The container runs rootless and is already tested. Which persistence approach is most appropriate for Podman 4.4-era EX188 tasks?
support-portal works when run as rootful Podman but fails rootless when writing mounted files. The host directory is owned by root, and the image runs as UID 1001. Which diagnostic is most relevant?
catalog-api should start with python3 /opt/app/server.py by default, but exam graders may override the command to run a diagnostic shell. Which Containerfile instruction best provides a default without blocking command replacement?
The $app API must wait until the database container is reachable. A compose-style file lists both services, but startup order alone has not prevented connection failures. What is the best design correction?
A Containerfile for orders-api has a build-time version that changes during CI and a runtime log level that operators may override. Which use of ARG and ENV best fits Red Hat container build behavior?
Career Opportunities & Salary
Exam insights and study advice
Containers and Kubernetes have become the de facto standard for deploying modern, scalable applications. However, theoretical knowledge of these technologies is insufficient for production environments. The EX188 exam matters because it validates hands-on, practical skills on Red Hat OpenShift, the leading enterprise Kubernetes platform. This certification demonstrates to employers that you can perform critical operational tasks-such as securing deployments, managing storage, and troubleshooting applications-in a real-world context. It bridges the gap between understanding concepts and being able to execute them reliably, making you directly valuable to teams adopting or managing cloud-native infrastructure. In a competitive job market, this certification is tangible proof of your ability to contribute immediately to container platform operations.
What this exam covers
01Implement images using Podman and Containerfile
Topics
- Understand how to specify the container’s base image.
- Understand how to add content to the container.
- Understand how to configure the container’s run time environment including user id, working directory and running arbitrary commands.
- Understand when and how to expose ports from a Containerfile.
- Understand how to pass environment variables and arguments to an image built from a Containerfile.
- Understand how to specify the command to be run in a custom image.
- Understand container volumes including sharing host data with the container.
- Understand the security and permissions requirements related to host and network access from the container.
- Understand container and image life cycles and how to manage them.
Learning objectives
- Understand how to specify the container’s base image.
- Understand how to add content to the container.
- Understand how to configure the container’s run time environment including user id, working directory and running arbitrary commands.
- Understand when and how to expose ports from a Containerfile.
- Understand how to pass environment variables and arguments to an image built from a Containerfile.
- Understand how to specify the command to be run in a custom image.
- Understand container volumes including sharing host data with the container.
- Understand the security and permissions requirements related to host and network access from the container.
- Understand container and image life cycles and how to manage them.
02Manage images
Topics
- 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.
Learning objectives
- 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.
03Run containers locally using Podman
Topics
- 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.
Learning objectives
- 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.
04Run multi-container applications with Podman
Topics
- Create application stacks
- Understand container dependencies
- Working with environment variables
- Working with secrets
- Working with volumes
- Working with configuration
Learning objectives
- Create application stacks
- Understand container dependencies
- Working with environment variables
- Working with secrets
- Working with volumes
- Working with configuration
05Troubleshoot containerized applications
Topics
- Understand the description of application resources
- Get application logs
- Inspect running applications
- Connecting to running containers
Learning objectives
- Understand the description of application resources
- Get application logs
- Inspect running applications
- Connecting to running containers