Centos7 安装docker ce

一. 安装docker

1.升级rpm包

yum -y update  

2. 通过命令设置Docker CE 资源库: 

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

3.生成缓存

sudo yum makecache fast 

4.查看可下载版本

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

4.安装并启动docker

yum -y install docker-ce  

二.设置镜像下载地址

在/etc/docker/daemon.json 内添加

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

三、开放管理端口映射

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

  ExecStart=/usr/bin/dockerd 

  替换为 下面

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

2.将管理地址变量写进profile

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

四.重启服务

systemctl daemon-reload && systemctl  restart docker

五、测试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/