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XK0-006 Practice Question: Managing a containerized microservices…
You are managing a containerized microservices environment using Podman. One of the services needs to access a PostgreSQL database running in a separate container. The database container is named 'db' and uses the default bridge network. The application container is launched with the command: podman run -d --name app --network host myapp. The application fails to connect to the database using the hostname 'db'. Which change should you resolve the issue?
⚠ Common exam trap
CompTIA often tests the misconception that the default bridge network supports automatic DNS resolution by container name, when in reality only user-defined networks provide that feature in both Podman and Docker.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a user-defined network and connect both containers
The default bridge network in Podman does not provide automatic DNS resolution between containers by name. When the app container uses `--network host`, it shares the host's network stack and is not connected to any container network, so it cannot resolve the container name 'db'. A user-defined network enables built-in DNS resolution, allowing containers to communicate by name. Connecting both containers to the same user-defined network resolves the connectivity issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a user-defined network and connect both containers
Why this is correct
A user-defined network provides automatic DNS resolution, allowing 'db' to resolve to the database container.
- ✗
Use --link db:db when running app container
Why it's wrong here
--link is deprecated and may not work with remote Podman or newer versions; user-defined networks are preferred.
- ✗
Set environment variable DB_HOST=localhost
Why it's wrong here
localhost inside the host-network container refers to the host itself, not the database container.
- ✗
Run app container on the same network as db using --network bridge
Why it's wrong here
The default bridge network does not provide DNS resolution; containers can only communicate via IP addresses.
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User and Group Administration
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
Key term
DNS
DNS is the system that translates human-friendly domain names like example.com into machine-readable IP addresses so computers can find each other on a network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.