Centos7Docker安装

1、修改镜像仓
sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

2、安装docker

添加阿里云 Docker 镜像源（加速下载）
sudo wget -O /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

sudo yum clean all
sudo yum makecache

安装 Docker CE
sudo yum install -y docker-ce docker-ce-cli containerd.io

启动并验证
sudo systemctl start docker
sudo docker --version # 应显示 Docker 版本号