记录一次安装docker，并修改镜像源。 Ubuntu18.04内核

将 Ubuntu 软件源替换为 ​​国内镜像源​​（如阿里云、中科大），加速下载。

1. 备份原软件源配置

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2. 替换为阿里云 Ubuntu 镜像源

sudo vim /etc/apt/sources.list

　将替换内容放在最前或全部替换：

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse

3. 更新包索引

sudo apt update -y

4.安装 Docker 组件​

sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

#启动服务
sudo systemctl start docker
#开机自启动
sudo systemctl enable docker

5.切换镜像源

sudo vim /etc/docker/daemon.json

替换内容

{
  "registry-mirrors": [
        "https://xxxxx1",
        "https://xxxxx2",
        "https://xxxxx3"
  ],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}