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Docker Compose

Browse all articles, tutorials, and guides about Docker Compose

5posts

Guides

Introduction to Docker

Learn Docker step by step with Engine 29: install it, run containers, write Dockerfiles, use volumes, networks and Compose, then deploy to production.

Posts

Docker
|18 min read

Forward Host Port to Docker Container

Publish container ports with -p, bind them to localhost, add a port to a container that already runs, understand ports vs expose in Compose, connect to Postgres in a container, find a container IP, and connect containers from different Compose projects.

Docker
|7 min read

docker compose: Always Recreate Containers from Fresh Images

Run docker compose up -d --pull always --build --force-recreate to pull newer images, rebuild local ones and replace containers instead of reusing them.

Docker
|12 min read

How to Use Environment Variables in Docker and Docker Compose

Pass environment variables with docker run -e and --env-file, set them in Compose with environment, env_file and .env files, learn which value wins, use defaults and required variables, set ENV and PATH in a Dockerfile, and keep secrets out of all of them.

Docker
|16 min read

How to Rebuild, Restart and Upgrade a Docker Compose Container

restart, up -d, up --build and --force-recreate each apply a different kind of change, and only one of them rebuilds your image. Tested on Compose 5.6: which command picks up which change, how to start only some services, wait for a healthy database, upgrade without losing data, get a shell in a crashed service, and what changed from docker-compose v1.