Dockerのインストールと基本コマンド

Now let's go hands-on. You'll install Docker on your machine and start running its most essential commands.

On Windows or macOS, Docker Desktop is the easiest start — it bundles Docker Engine, the CLI, Compose, and a friendly GUI in one install.

Install Docker Desktop: on Mac drag it to Applications; on Windows run the .exe (WSL 2 may be needed). Then launch it and watch for the whale icon.

On Linux you install Docker Engine through your package manager — apt, dnf, or yum. Always check the official docs for your exact distro.

Confirm the install worked. Run docker --version in your terminal to print the Docker client version.

Need the full picture? docker info dumps server version, storage driver, and config details — perfect for troubleshooting your environment.

Before you can run anything you need an image. docker pull downloads one from a registry like Docker Hub to your local machine.

docker run creates and starts a container from an image, pulling it first if it's missing. The command below runs the classic hello-world.

docker ps lists your running containers. Add the -a flag to include stopped ones too, like that hello-world that already exited.

Recap: you can install Docker, verify it with docker --version and info, and use pull, run, and ps to fetch images and manage containers.