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:
 . The Docker client contacted the Docker daemon.
 . The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 . The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 . 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/