docker安装(centos7)

1.确定自己所在的系统是centos7及以上：cat /etc/redhat-release

2.确保centos7所在的机器能上外网

3.yum安装gcc相关：3.1 yum -y install gcc    3.2 yum -y install gcc-c++

4.卸载旧版本 

yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine

5.安装需要的软件包

yum install -y yum-utils device-mapper-persistent-data lvm2

6.设置stable镜像仓库

千万不要写这个：yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

要写这个：yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

7.更新yum软件包索引   

yum makecache fast

8.安装DOCKER CE

yum -y install docker-ce

9.启动docker

systemctl start docker

10.测试

docker version      

docker run hello-world

11.配置镜像加速

mkdir -p /etc/docker

vim  /etc/docker/daemon.json

这个daemon.json里面的内容为：

{ "registry-mirrors": ["https://t6ljgmyd.mirror.aliyuncs.com"] }

systemctl daemon-reload

systemctl restart docker