sudo systemctl start docker
sudo systemctl enable docker

5、要驗證Docker服務(wù)正在運行，請鍵入：

sudo systemctl status docker

輸出應如下所示：

● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2018-10-31 08:51:20 UTC; 7s ago
     Docs: https://docs.docker.com
 Main PID: 2492 (dockerd)
   CGroup: /system.slice/docker.service
           ├─2492 /usr/bin/dockerd
           └─2498 docker-containerd --config /var/run/docker/containerd/containerd.toml

6、在撰寫(xiě)本文時(shí)，Docker的當前穩定版本為18.06.1，以打印Docker版本類(lèi)型：

docker -v

Docker version 18.06.1-ce, build e68fc7a

sudo usermod -aG docker $USER

docker container run hello-world

輸出應如下所示：

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
9bb5a5d4561a: Pull complete
Digest: sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

docker [option] [subcommand] [arguments]

您可以通過(guò)鍵入不帶參數的docker列出所有可用命令：

docker

如果您需要關(guān)于[subcommand]的更多幫助，只需鍵入：

docker [subcommand] --help