授予用户Docker管理权限

允许特定用户执行Docker管理任务，而无需root管理权限。
在下面的示例中，我们将为用户onitroad提供Docker管理权限：

# usermode -aG docker onitroad

安装docker.io包

# apt install docker.io

更新来源列表

Docker包是标准Debian 10存储库的一部分。
在执行实际的docket安装之前，请执行以下命令以更新包索引：

# apt update

测试Docker安装

最简单的测试方法是部署和运行 hello-world容器：

# docker run hello-world
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/