Docker Compose Intermediate Guide
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About This Cheat Sheet
Docker Compose Intermediate Guide is a 5-10 page guide that assumes you already know the basics and focuses on the techniques, idioms, and trade-offs that separate competent users from confident practitioners.
Docker Compose Intermediate Guide covers Docker — the container platform that has redefined how applications are packaged, shipped, and run across local laptops, CI pipelines, and production clusters. It is written for developers, DevOps engineers, platform teams, and anyone shipping containerised workloads who need accurate, working syntax without wading through documentation. This particular sheet zooms in on Compose — the parts of Docker that come up most often in real work. A 7-page guide to intermediate Docker Compose. Covers multi-service architecture, health checks, custom networks, profiles, environment management, volumes, multi-stage builds, override files, and production deployment patterns.
Every command, flag, and pattern in this sheet has been validated against current stable releases as of 2026. Where syntax differs between distributions, versions, or platforms, both forms are shown so you can copy-paste safely regardless of the environment you are working in. The PDF is print-ready in both A4 and US Letter formats and remains free to download forever.
What's Inside the PDF
- Compose — the practical commands and patterns you actually use in production Docker work.
- Most-used commands grouped by task, not alphabetically, so you find what you need by intent.
- Common flag combinations with one-line comments explaining what each option actually does.
- Real-world examples that show inputs and expected outputs, not contrived hello-world snippets.
- Edge cases and gotchas that the official documentation buries on page 47.
- Print-friendly layout that works equally well on screen and on paper next to your monitor.
When to Use This Cheat Sheet
- 1Building reproducible application images that run identically on a developer laptop, in CI, and in production Kubernetes clusters.
- 2Debugging a container that exits immediately or runs out of memory, where knowing `docker logs`, `docker inspect`, and `docker exec` saves hours.
- 3Composing multi-service local environments (web + database + cache + worker) with `docker-compose` for fast iteration.
- 4Optimising image size and build times using multi-stage builds, BuildKit cache mounts, and `.dockerignore`.
- 5Hardening images for production by running as non-root, scanning for CVEs, and pinning base-image digests.
Key Concepts to Master
Images vs containers
An image is an immutable filesystem snapshot. A container is a running instance of an image plus a writable layer. You can have many containers from one image.
Layers and caching
Each `RUN`, `COPY`, and `ADD` creates a layer. Docker caches layers aggressively, so ordering Dockerfile instructions from least-to-most-frequently-changed dramatically speeds up rebuilds.
Volumes and bind mounts
Containers are ephemeral. Persistent state (databases, uploads, logs you want to keep) belongs in named volumes or bind mounts, not the container filesystem.
Networking
Docker creates a default bridge network. Containers on the same user-defined network can resolve each other by name — this is how Compose stacks talk without hard-coded IPs.
Build context
The build context is the directory sent to the daemon. A bloated context (forgotten `node_modules`, `.git`, large media) slows every build and ships secrets accidentally.
Pro Tips from Practitioners
- Use multi-stage builds to ship a tiny runtime image while still having access to compilers and tooling during the build.
- Pin base images by digest (`FROM nginx@sha256:...`) for reproducibility, especially in security-sensitive contexts.
- Add a `.dockerignore` before your first `docker build` — it stops `node_modules`, `.git`, and `.env` from leaking into the image.
- Run containers as a non-root user (`USER 1000`) and drop capabilities you do not need. Most CVEs are exploitable only with root inside the container.
- Use `docker compose watch` (BuildKit) or bind-mounts during development for instant feedback, but never in production.
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Frequently Asked Questions
What is the Docker Compose Intermediate Guide?
The Docker Compose Intermediate Guide is a free, professionally designed PDF reference covering Docker. It is curated by practitioners and validated against current stable releases as of 2026.
What level of Docker experience does this assume?
Roughly six months of regular use. You should be comfortable with the daily commands and ready to learn the patterns, trade-offs, and idioms that come with experience.
Do these commands work with Podman or containerd?
Most `docker` CLI commands have a direct Podman equivalent (`podman run`, `podman ps`, etc). For containerd, use `nerdctl` which mirrors the Docker CLI surface closely.
What is the difference between Docker and Docker Compose?
Docker manages individual images and containers. Docker Compose orchestrates multi-container applications via a `docker-compose.yml` file, handling networks, volumes, and dependency order for you.
How do I keep my Docker images small?
Use slim or Alpine base images, multi-stage builds, combine `RUN` commands to reduce layers, clean package caches in the same `RUN`, and add a strict `.dockerignore`.
Is it safe to run Docker in production?
Yes, when configured correctly: run as non-root, scan images for CVEs, use read-only filesystems where possible, set resource limits, and never expose the Docker socket without authentication.
Is this cheat sheet really free?
Yes, completely free. We ask for your email so we can let you know when new cheat sheets are released and to keep our spam-detection systems happy. You can unsubscribe in one click at any time.
Can I print and share this cheat sheet?
Yes — print it, pin it to your wall, share it with your team, hand it out at meetups. The only thing we ask is that you do not strip the Dargslan attribution or republish the PDF as your own work.