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Docker 101: Publish All Exposed Ports on Random Host Ports to Avoid Port Conflicts
Can you get several builds of an app running side by side without port conflicts, so you can test them simultaneously?
Challenges
Focused, hands-on problems for sharpening your DevOps and server-side skills. Some teach specific concepts while others mirror real-world scenarios. Every challenge includes hints, feedback, and automated solution checks.
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Connect Two Network Namespaces
Prove your Linux networking skills by connecting two network namespaces with a virtual Ethernet device.
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Set Up Network Address Translation (NAT) for a Container
There is a container that can reach the host only through its veth pair and cannot call any other addresses. Can you connect it to the outside world?