卸载：

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

sudo yum remove docker*

安装：

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

sed -i 's/download.docker.com/mirrors.aliyun.com\/docker-ce/g' /etc/yum.repos.d/docker-ce.repo

yum makecache fast

yum install -y docker-ce-3:19.03.9-3.el7.x86_64  docker-ce-cli-3:19.03.9-3.el7.x86_64 containerd.io

systemctl start docker
systemctl enable docker

配置：vi /etc/docker/daemon.json

// max-concurrent-downloads： 最大并发下载
// "max-concurrent-uploads": 最大并发上传
// log-opts: 日志设置，单文件最大，最大几个文件
// 容器的日志都在 /var/lib/docker/containers/容器名/xxx.log
// "live-restore"： 停机保活

{
  "registry-mirrors": [
    "https://docker.1ms.run",
    "https://docker.xuanyuan.me",
    "https://docker.1panel.live",
    "http://mirrors.ustc.edu.cn/",
    "http://mirror.azure.cn/",
    "https://hub.rat.dev/",
    "https://docker.ckyl.me/",
    "https://docker.chenby.cn",
    "https://docker.hpcloud.cloud",
    "https://docker.m.daocloud.io"
  ],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "max-concurrent-downloads": 10,
  "max-concurrent-uploads": 5,
  "log-opts": {
    "max-size": "300m",
    "max-file": "2"
  },
  "live-restore": true
}