Tech Study Guide

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A study-first technical wiki for infrastructure, networking, databases, and engineering notes.

study-system

A searchable place to keep research notes, commands, diagrams, troubleshooting playbooks, and reference material.

Main Areas

Area Purpose
Linux Operating system fundamentals for developers and operators: processes, memory, CPU, kernel params, GPU drivers, and troubleshooting.
Kubernetes Cluster concepts, workloads, networking, storage, operations, and troubleshooting.
DNS Records, resolution flow, authoritative DNS, recursive DNS, and debugging.
Networking TCP/IP, routing, NAT, firewalls, load balancing, and packet analysis.
Istio Service mesh concepts, sidecar and ambient data planes, mTLS, traffic policy, telemetry, and troubleshooting.
Ceph Distributed storage concepts, RADOS, pools, PGs, CRUSH, CephFS, RBD, health checks, and Rook-Ceph.
Databases Database fundamentals, modeling, indexes, transactions, and operations.
PostgreSQL PostgreSQL architecture, SQL, performance, backups, and administration.
CloudNativePG PostgreSQL operations inside Kubernetes with the CloudNativePG operator.

Study Page Pattern

Use this structure for new notes:

  1. What problem the technology solves.
  2. Core concepts and vocabulary.
  3. Mental models and diagrams.
  4. Hands-on commands or labs.
  5. Failure modes and troubleshooting.
  6. Links to deeper references.