Systems & Ops
Internals, engineering practices, and runtime tuning. 15 topics across 7 chapters.
Containerization
3 topicsDocker Container Basics
Pack app + deps + runtime into an image — the smallest unit of modern deployment.
Dockerfile & Multi-stage Builds
How to write small, fast, cache-friendly images — the hardcore tricks asked in interviews and required in prod.
Docker Compose
Describe a whole local / single-host environment in one YAML — the standard for multi-container dev.
Kubernetes
3 topicsKubernetes Core Concepts
Pod / Deployment / Service / Namespace — the minimum mental model for K8s from zero.
Pod / Service / Ingress Trio
K8s networking in three layers — drives traffic from outside all the way to the container process.
Helm (K8s package manager)
Bundle a set of K8s resources into a parameterizable chart — reuse + upgrade + rollback.
Observability
2 topicsAutomation & Delivery
2 topicsContainer Internals
1 topicsReliability & Security
3 topicsBackup & Restore (3-2-1 rule)
An untested backup isn't a backup — the bottom line for data safety.
Linux Performance Tuning Basics
USE method + the four-axis (CPU / mem / disk / net) checklist — find bottlenecks without guessing.
Server & Container Hardening
Turn defaults into 'survives a hostile environment' — simple but unskippable basics.