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# 如何安装 Docker

首先你需要有一台干净的 Linux 服务器，这里以 Ubuntu 20.04 为例，不完全一定要是 20.04，大部分版本的 Ubuntu 都可以，服务器可以是物理机，可以是虚拟机，也可以是网上购买的云服务器。

其他操作系统安装方式见 <https://docs.docker.com/engine/install/>

Ubuntu 也可以看官方的 Docker 教程 <https://docs.docker.com/engine/install/ubuntu/>

### 清理并更新你的机器

我们先更新 apt 并且删除机器上以前安装的，有关 Docker的一切，如果以前没有安装过 Docker，可以只更新 apt

```bash
sudo apt update
sudo apt-get remove docker docker-engine docker.io containerd runc纤维
```

### 为 apt 配置 docker 源

给 apt 配置 docker 源可以使我们通过 apt 包管理器来快速安装docker

```bash
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
```

### 安装 docker

接下来我们就可以直接通过 apt 来安装 docker了

```
 sudo apt-get update
 sudo apt-get install docker-ce docker-ce-cli containerd.io
```

### 配置用户权限

一般用户是没有权限使用 docker 的，我们需要为当前用户添加使用 docker 的权限，这样我们使用 docker 时就可以不添加 sudo 了

```bash
sudo groupadd docker
sudo usermod -aG docker $USER
```

在将用户添加到组以后，需要重新启动 shell，或者重新启动终端，或者重新连接 SSH，才可以生效，不然之后使用 docker 命令时，依然会出现 permission denied

最后只需要用 systemctl 来启动，并且配置开机自启 docker 守护进程，我们就成功地在这台服务器上安装完了 docker

```bash
sudo systemctl start docker.service
sudo systemctl enable docker.service
```


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