Docker是一個開源的容器化應(yīng)用平臺，可以方便地創(chuàng)建、部署和運(yùn)行應(yīng)用程序。

Docker的hello-world是一個簡單的例子，可以用來測試Docker是否正確安裝并運(yùn)行。下面是一段hello-world的代碼：

docker run hello-world

這個命令會在Docker中下載并運(yùn)行hello-world的鏡像，輸出以下信息：

Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
 3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/
For more examples and ideas, visit:
 https://docs.docker.com/get-started/

這說明你已經(jīng)成功安裝Docker并可以開始使用它了。