Adam Leskis has published 3 challenges and prepared 7 playgrounds.
Explore live host CPU/Memory/Disk/Network telemetry as an interactive Doom diagnostics lab. All the elements in the game react to system signals (eg, the cpu cores glow red when there's high utilization).
Practice Linux USE-method investigations against randomized host-level scenarios. It already has the investigation and load generating tools installed, so you can begin with that, or just run a free-form investigation.
A multi-node K3s cluster to demo connecting and troubleshooting a homelab remotely via tailscale. All username/passwords are admin/admin123
This exercise tests your ability to configure kubernetes network policies to make sure only pods with specific labels can communicate with each other.
A stock Django + Strawberry GraphQL service ships with five common weaknesses. Probe each one from the terminal, fix it in the real project, and watch the lab confirm the remediation against the live endpoint.
This exercise tests your ability to safely upgrade a multi-node Kubernetes cluster from version 1.34 to 1.35 following the standard upgrade procedure.
This exercise tests your ability to configure kubernetes network policies to make sure only pods with specific labels can communicate with each other.
A small shop runs on a k3s cluster across several VMs, with real traffic and a steady stream of routine events. Start a shift with your team. Something will go wrong. Find it, fix it, and check that it stays fixed.
A multi-node kubeadm cluster that installs GitLab CE with the official Helm chart at startup, with in-cluster PostgreSQL, Redis, RustFS object storage, Container Registry, and an Envoy HTTPS Gateway.
Watch a three-member Patroni PostgreSQL 16 cluster fail over while Debezium keeps streaming outbox events to Kafka.
Explore metrics from five services across multiple VMs, trigger a Grafana alert, and watch its webhook appear in the lab.
A stock Django + Strawberry GraphQL API with five classic weaknesses to probe and harden.