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Identify the Source of Unexpected Requests in a Kubernetes Cluster
An internal service started receiving requests from unexpected IP addresses. Identify the unexpected sources and find out which workloads and teams are behind them.
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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Identify the Source of Unexpected Requests in an On-Prem Network
An internal service started receiving requests from unexpected IP addresses. Identify the unexpected sources and find out which systems are behind them.
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Inspect Network Interfaces, IP Addresses, and Routes on a Linux Host
Practice reading the network configuration of Linux hosts: find interface names, IP and MAC addresses, the default gateway, and detect which routes a server uses to reach different destinations.
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Enable Internet Access for a Private Network with a NAT Gateway
Configure a Linux NAT gateway to give Internet access to private RFC 1918 networks while keeping them hidden from the outside world.
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Configure Routes to Connect Two Private Networks
Hone your Linux networking skills by setting up routing that lets two isolated private networks communicate.
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Reproduce a Docker Bridge Network Using Basic Linux Commands
The culmination of the Docker networking challenges series. Can you create a Docker-like bridge network from scratch and using nothing but basic Linux commands.
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Connect Multiple Network Namespaces
Prove your mastery of Linux and containers by connecting multiple network namespaces into a single network.
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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?
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Create a Linux Network Namespace
Learn how to create fully isolated virtual network environment using Linux network namespaces.