TheAlanWang

Notes

00.Docker Intro

2 min read

Docker Basics

Docker is a tool that lets you package an app together with everything it needs to run (code, libraries, system dependencies, settings) into a container, so it runs the same on your laptop, a server, or the cloud.

Core Concepts

  • Image: Template/blueprint for containers (like a class)
  • Container: Running instance of an image (like an object)
  • Dockerfile: Recipe for building images
  • docker-compose.yml: Configuration for running multiple containers

Docker Compose

Build and Start

From the project root (where docker-compose.yml is), run:

# Build and start the container (attached / foreground)
docker compose up --build
 
# Build and start in background (detached / background)
docker compose up --build -d

Stop Containers

# Remove containers/network created by compose
docker compose down
 
# Stop containers (keeps containers, removes network)
docker compose stop

Basic Docker Commands

Container Management

# View running containers
docker ps
 
# View all containers (including stopped)
docker ps -a
 
# View container logs
docker logs <container_name>
docker logs hello-service-container
 
# Follow logs in real-time
docker logs -f <container_name>
 
# Execute commands in running container
docker exec -it <container_name> sh
docker exec -it hello-service-container sh
 
# Inspect container details
docker inspect <container_name>
docker inspect hello-service-container
 
# View Docker resource usage
docker stats

Image Management

# List images
docker images
 
# Build image from Dockerfile
docker build -t <image_name>:<tag> .
 
# Remove image
docker rmi <image_id_or_repo:tag>

Common Workflows

Build and Run Single Container

# Build image
docker build -t my-app:latest .
 
# Run container
docker run -p 8080:8080 my-app:latest
 
# Run in background
docker run -d -p 8080:8080 my-app:latest

Build and Run with Docker Compose

# Build and start
docker compose up --build
 
# Start in background
docker compose up --build -d
 
# Stop and remove
docker compose down

Graph View

Backlinks