Docker Compose

Introduction

Docker Compose is a tool for defining and running multi-container applications. It is the key to unlocking a streamlined and efficient development and deployment experience.

1 Dockerfile → 1 Image Build

Docker Run → Run 1 Container with ENTRYPOINT & CMD

Docker Compose → Run multiple containers with 1 YAML-formatted file

containers

networks

volume

Installation

Template

“Docker-compose.yml” has versions: 1,2,3...

Jekull Template

Wordpress Template

Ghost Template

Secrets in Compose

Bởi vì trong Compose có rất nhiều biến môi trường, nên lưu trữ Secrets là điều cần thiết, nhất là khi cần phải sử dụng với Github.

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Secrets in Compose Learn how to securely manage runtime and build-time secrets in Docker Compose. docs.docker.com⁠

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Commands

# build, run all containers

docker compose up

# stop and remove all containers

docker compose down

# remove all images as well

docker compose down -rmi

# list all container is compose

docker compose ps

Default Nginx + Apache Template

Use Compose to build Custom Nginx Image + Apache with HTML code

Nginx Config

This nginx.conf configures Nginx as a reverse proxy. Here’s what it does:

Listens on port 80.

For all requests (location /), it forwards (proxies) them to a backend service named web (which is apache).

It sets several headers to preserve the original client information (Host, X-Real-IP, X-Forwarded-For, X-Forwarded-Host).

Disables automatic proxy redirects.

Compared to the default config in the official Nginx image:

The default config serves static files from /usr/share/nginx/html and does not proxy requests.

The default does not set up any proxy headers or backend forwarding.

In summary: This config turns Nginx into a reverse proxy for a backend service, while the default config just serves static files.

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