docker安装

1.yum 源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum makecache
2.Docker和Docker Compose安装
（1）更新软件包 yum update
（2）sudo yum install -y yum-utils device-mapper-persistent-data lvm2
（3）sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
（4）yum list docker-ce --showduplicates | sort -r
（5）yum install docker-ce
（6）加速器
a.sudo mkdir -p /etc/docker
b.sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://dhq9bx4f.mirror.aliyuncs.com"]
}
EOF
c.sudo systemctl daemon-reload
d.sudo systemctl restart docker
（7）开机启动systemctl enable docker
（8）启动systemctl start docker