How to Pass the Red Hat EX188 Exam (Containers with Podman) on Your First Attempt

Key takeaways

• EX188 covers containers with Podman. OpenShift administration is EX280 and application development is EX288.
• It is a lab-based exam scored on working results, so typing practice matters more than reading.
• Combine volumes, SELinux labels and rootless behaviour in practice; they cause many failures.
• Confirm duration, task count, passing score and fee on Red Hat's page; they change.

What is EX188, really?

EX188 is Red Hat's hands-on exam on containers with Podman. It goes with the course DO188, "Red Hat OpenShift Development I: Introduction to Containers with Podman". It is not an OpenShift Container Platform administration exam, and it is not multiple choice. If you want the OpenShift administration exam, that is EX280, and the application development exam is EX288.

Exam facts to check before you book

Red Hat sets exam format, length and scoring, and updates them. Confirm the duration, number of tasks, format, passing score, prerequisites and certification validity on Red Hat's EX188 page before you plan around them. The exam fee changes by country and with tax, so ask WebAsha or Red Hat for the current price.

Whatever the numbers, the format is the part that matters: you are given real systems and a list of tasks, and you are scored on the working result.

What skills does it test?

The official objective list is the source to follow. In practice, an exam on introductory Podman covers these areas:

• Images and containers: pull, list, run, stop, remove, inspect, view logs, run commands inside a container.
• Building images: write a Containerfile (or Dockerfile) using instructions such as FROM, RUN, COPY, ENV, EXPOSE, CMD and ENTRYPOINT, and build and tag the image.
• Registries: log in, tag, push and pull images; inspect remote images.
• Networking: publish ports, name containers, connect containers on a shared network.
• Persistent storage: volumes and bind mounts, and the SELinux label option that lets a container read a host directory.
• Rootless containers: run as a normal user, and know the limits (for example, ports below 1024).
• Running as a service: start containers at boot with systemd, with Quadlet or generated unit files depending on the RHEL release.
• Troubleshooting: read logs, inspect configuration, find why a container exits.

Treat this list as a study guide and check it against the official objectives, since the exact content depends on the exam version.

How to prepare, step by step

1. Get the Linux basics solid. There is no formal prerequisite, but containers sit on top of Linux: files, permissions, users, services, networking and SELinux. RHCSA-level skills make this exam much easier.
2. Build a lab. An RHEL-compatible VM (Rocky Linux or AlmaLinux are fine for practice) with Podman installed. Practise both as root and as a normal user.
3. Learn by doing, daily. A fixed 45 minutes of typing beats a weekend of reading. Start with podman run, ps, logs, exec and inspect.
4. Write a Containerfile from nothing. Build a small web image. Change the base image, add a file, rebuild, tag it, and run it.
5. Do storage and SELinux together. Mount a host directory into a container, watch it fail with SELinux enforcing, and fix it with the right label option. Do it several times.
6. Make it survive a reboot. Run a container as a systemd service, reboot the VM, and check it comes back.
7. Practise timed tasks. Write 8 to 10 tasks yourself, give yourself the exam time, and do them without notes except man pages and the Podman documentation.
8. Review mistakes. After each practice session, list what you had to look up and repeat it.

A short worked example

This is the kind of workflow to be able to do from memory, in a lab:

mkdir -p ~/site && echo "hello" > ~/site/index.html
podman run -d --name web -p 8080:80 \
 -v ~/site:/usr/share/nginx/html:Z \
 docker.io/library/nginx
curl http://localhost:8080
podman logs web
podman inspect web --format '{{.State.Status}}'
podman stop web && podman rm web

The :Z option relabels the directory for the container under SELinux. Without it, a bind mount on RHEL-family systems commonly fails with permission errors.

Exam-day habits

• Read each task twice and note exact names, ports, paths and tags.
• Verify each result with a command (podman ps, curl, systemctl --user status).
• Do not spend too long on one task; move on and return.
• Check persistence after a reboot if the task asks for start at boot.

Common mistakes

• Studying OpenShift instead of Podman because of the older, incorrect description of the exam.
• Only reading. The exam rewards typing speed and accuracy under time pressure.
• Ignoring SELinux and rootless behaviour.
• Forgetting to publish a port or to open the firewall when a task asks for access from another machine.

Where it fits in a career path

EX188 is a sensible first container credential for Linux administrators and developers. A common next step is Kubernetes or OpenShift: EX280 for OpenShift administration, EX288 for application development, or the CNCF exams (CKA, CKAD, CKS) if you are going the upstream Kubernetes route. See the Kubernetes documentation for how containers are orchestrated at scale.

Next steps

If you want guided practice, see WebAsha's DO188 containers with Podman course, and the OpenShift administration course if you plan to continue to EX280. For exam-technique reading, try how to pass OpenShift EX280 and tips for CKA, CKAD and CKS.

Related reading

• How to Pass AI267 | EX267 | Red Hat Certified Specialist in OpenShift AI Certification Exam in Your First Attempt!
• DO188 Lab Setup | Discounted Exam Voucher of EX188 |Exam Preparation | Study Material | Mock Tests
• How To Pass the Certified Ethical Hacking CEH v12 Certification Exam in First Attempt