一. 安裝docker

1.升級rpm包

yum -y update  

2. 通過命令設置Docker CE 資源庫:

 yum install -y yum-utils      
 yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo  

3.生成緩存

sudo yum makecache fast 

4.查看可下載版本

yum list docker-ce --showduplicates | sort -r

4.安裝並啟動docker

yum -y install docker-ce  

二.設置鏡像下載地址

在/etc/docker/daemon.json 內添加

 {
      "registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]
    }
    

三、開放管理端口映射

1.編輯 /lib/systemd/system/docker.service

ExecStart=/usr/bin/dockerd

替換為 下面

 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:
 
///var/run/docker.sock -H tcp://0.0.0.0:7654

2.將管理地址變量寫進profile

echo ‘export DOCKER_HOST=tcp://0.0.0.0:2375‘ >> /etc/profile

四.重啟服務

systemctl daemon-reload && service  restart docker

五、測試docker

docker run hello-world 

若成功：

Unable to find image ‘hello-world:latest‘ locally
latest: Pulling from library
 
/hello-world
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.

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/engine/userguide/

Centos7 安裝docker ce