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Documentation Course

Docker In-Depth

From Container Internals to Production SaaS Deployment

A production-grade curriculum designed for developers who want to move past generic tutorials. Dive deep into container internals (namespaces, cgroups), optimize image builds using BuildKit, orchestrate local development with Compose v2, and master production operations, security, and observability.

Written by Jatin Jain Saraf · Architect of SupraScan

Free9 modulesIntermediate to AdvancedWritten / Documentation-style9 of 9 modules live

How to use this course

This course works as both a sequential read and a standalone reference. Read front-to-back to build a complete mental model of Postgres under production load. Or jump to any module when you hit a specific incident — VACUUM bloat, a lock queue outage, a query regression after a data load.

Total reading time

~1 hr

across 9 live modules

Built from

10 TB

live blockchain indexer, cut to 2.7 TB

Prerequisite

Zero SQL to production internals

Beginner through senior engineer

Your instructor

Jatin Jain Saraf

Architect of SupraScan, Supra Blockchain's explorer and indexer: 500–1,000 TPS on a PostgreSQL database that grew to 10 TB, now 2.7 TB. The case studies show the production work behind these courses.

Read the case studies About me

Phase 1 — Foundation

Absolute basics · No prior knowledge assumed

2 modules

Unpacking the Container Illusion

Why containers are not VMs, Linux namespaces, cgroups, and the layered OverlayFS system.

Building Production-Grade Images

Writing optimal Dockerfiles, layer caching, BuildKit mounts, multi-stage builds, and multi-architecture image registries.

Phase 2 — Practitioner

Production patterns · Real application architecture

4 modules

Container Runtime Fundamentals

Container lifecycle, the PID 1 problem in Node.js, SIGTERM vs SIGKILL, and container inspection tools.

Container Networking Deep-Dive

Bridge vs Host networks, port publishing, internal DNS resolution, and troubleshooting connectivity.

Stateful Containers & Storage

Bind mounts vs Volumes, managing ephemeral data, and performance implications for databases like PostgreSQL.

Docker Compose for Local Dev

Compose v2 workflows, profiles, overrides, and managing boot order with depends_on and health checks.

Phase 3 — Architect

Engine internals · High-throughput systems · Distributed architecture

2 modules

Hardening & Security

Running non-root users, managing secrets without leaking them, dropping capabilities, and image scanning.

Production Operations & Observability

CPU/Memory resource limits, logging drivers, container metrics (docker stats), and robust health checks.

Capstone

Applied end-to-end build

1 modules

Capstone: Deploying a SaaS Application

Deploy a full stack (Next.js, Node, Postgres, Redis, Nginx) to a Linux VPS with production-ready security and operations.