在Ubuntu中安装Docker

Ubuntu 16.04+

# (安装 Docker CE)
## 设置仓库:
### 安装软件包以允许 apt 通过 HTTPS 使用存储库
sudo apt-get update && sudo apt-get install -y \
  apt-transport-https ca-certificates curl software-properties-common gnupg2

### 新增 Docker 的 官方 GPG 秘钥:
sudo touch /etc/apt/trusted.gpg.d/docker.gpg
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add --keyring /etc/apt/trusted.gpg.d/docker.gpg -

### 添加 Docker apt 仓库:
sudo add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) \
  stable"

## 安装 Docker CE
sudo apt-get update && sudo apt-get install -y \
  containerd.io=1.2.13-2 \
  docker-ce=5:19.03.11~3-0~ubuntu-$(lsb_release -cs) \
  docker-ce-cli=5:19.03.11~3-0~ubuntu-$(lsb_release -cs)

## 创建 /etc/docker 目录
sudo mkdir /etc/docker

# 设置 Docker daemon
cat <<EOF | sudo tee /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

# Create /etc/systemd/system/docker.service.d
sudo mkdir -p /etc/systemd/system/docker.service.d

# 重启 docker.
sudo systemctl daemon-reload
sudo systemctl restart docker