教程 | Tinkink如何在 CentOS 7 上安装 Docker
安装 yum-utils 并添加源
为了安装 Docker，我们需要首先安装yum-utils，以便添加 Docker 的源。
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yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo安装 Docker
直接使用yum命令即可安装 Docker。
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yum install docker-ce docker-ce-cli containerd.io运行并设置自启动
Docker 安装完之后不会自动运行，需要手动运行：
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systemctl start docker可使用docker ps命令查看 Docker 运行状态，如看到输出正在运行的窗口列表，则启动成功：
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES为了让 Docker 在每次重启系统的时候能自动运行，还需要设置自启动：
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systemctl enable docker至此就大功告成了。可以使用hello-world镜像验证一下：
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docker run hello-world看到以下输出即为成功：
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Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
93288797bd35: Pull complete
Digest: sha256:37a0b92b08d4919615c3ee023f7ddb068d12b8387475d64c622ac30f45c29c51
Status: Downloaded newer image for hello-world:latest
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.
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/