在CentOS7.6轨功、紅帽7.6系統(tǒng)中安裝Docker：

yum install -y docker
systemctl start docker.service
systemctl enable docker.service

注意：需要root權限。

命令詳情具體如下容达。

一古涧、卸載舊版本

卸載舊版本（如果安裝過的話）

sudo yum remove docker \
docker-common \
docker-selinux \
docker-engine

二、安裝Docker

docker軟件包已經(jīng)包括在CentOS7默認的CentOS-Extras軟件源花盐。因此想要安裝 docker羡滑，只需要運行下面的 yum 命令：

# 安裝docker
yum install -y docker

# 啟動docker,并設置開機啟動
systemctl start docker.service
systemctl enable docker.service

三、測試是否安裝成功

通過運行簡單的Docker鏡像hello-world來測試安裝是否有效 ：

 docker run hello-world

執(zhí)行該命令打印的信息中包含如下提示信息時算芯，說明安裝成功：

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

完整打印信息：

[root@chushiyan ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
Trying to pull repository docker.io/library/hello-world ... 
latest: Pulling from docker.io/library/hello-world
1b930d010525: Pull complete 
Digest: sha256:2557e3c07ed1e38f26e389462d03ed943586f744621577a99efb77324b0fe535
Status: Downloaded newer image for docker.io/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.
    (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/