What is the difference between -d and --rm in docker run?

-d means detached mode, the container runs in the background and the terminal is not attached. --rm means the container will be automatically removed after it stops. They can be combined: -d --rm runs in background and auto-cleans on stop.

How do I persist data in Docker?

Use Volumes or Bind Mounts. Volumes use -v volume-name:/container/path and data is stored in Docker-managed directories. Bind mounts use -v /host/path:/container/path to map a host directory into the container. For production, named volumes are recommended.

What is the difference between docker compose up and docker-compose up?

Docker Compose V2 is integrated into the Docker CLI, using "docker compose" (no hyphen). The old version uses the standalone "docker-compose" command. The new version recommends "docker compose" for more features and ongoing updates. This tool generates commands using the new syntax.

How can I optimize Docker image size?

1) Use lightweight base images like Alpine; 2) Use multi-stage builds to separate build and runtime environments; 3) Merge RUN instructions to reduce layers; 4) Use .dockerignore to exclude unneeded files; 5) Clean up build caches and temp files. This tool's Dockerfile generator supports multi-stage builds.

Docker Commands - Free Online Tool

run - Parameters

Image Name

Container Name

Port Mapping

Volume Mount

Environment Variables

Network

Restart Policy

Run in background (-d) Auto-remove after exit (--rm) Interactive mode (-it)

Extra Arguments

Startup Command

Dockerfile Snippet Generator

Base Image

Working Directory

Expose Port

Extra Instructions (one per line)

Multi-stage Build

Generated Dockerfile

FROM node:18-alpine
WORKDIR /app
EXPOSE 3000

Docker Commands生成器使用说明

主要功能

Visual Builder - 通过表单选择parameters，自动生成 Docker Commands
Common Templates - One-click generate common container commands (Nginx, MySQL, Redis, etc.)
Dockerfile Generation - Quickly generate Dockerfile snippets
一键Copy - 快速复制Generated Command到剪贴板
Full Command Support - 涵盖 run、build、exec、ps、logs 等所有常用Action

支持的Action

容器Action - run, exec, ps, logs, stop, rm
镜像Action - build, rmi, pull, push
Compose - docker compose up / down
Network管理 - network create/ls/rm/connect
Volume Management - volume create/ls/rm/prune

Docker Commands

Docker Commands生成器使用说明

主要功能

支持的Action

常见问题

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