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# 为什么需要 Alpine

之前的 Centos 是从 docker hub 中下载下来的，我们可以看一下它的大小

{% embed url="<https://hub.docker.com/layers/centos/library/centos/7/images/sha256-e4ca2ed0202e76be184e75fb26d14bf974193579039d5573fb2348664deef76e?context=explore>" %}

嗯，72M，还不错，可以更小嘛？

{% embed url="<https://hub.docker.com/layers/alpine/library/alpine/latest/images/sha256-1775bebec23e1f3ce486989bfc9ff3c4e951690df84aa9f926497d82f2ffca9d?context=explore>" %}

嗯？有 2.68M 的 Docker Image？

快拉下来看看

```bash
docker run -it alpine
```

跑起来了

Alpine 最大的特点就是小，非常小。他是怎么做到的呢？按照我们平时的认知，最基础的 Linux 指令 ，cp ls 那些什么的，也要几百kb吧

我们可以看一下 Ubuntu的这些基础指令有多大，嗯，一个 cp 就要 100多K

![Ubuntu](/files/-Mcy-2USq2JbXlhEbJaH)

Alpine 呢？

![](/files/-Mcy-Jcxng3BGCEnjnQW)

会发现，所有的常用指令都指向了busybox，而且一个 busybox 只有800多K

busybox 是一种提供精简的Unix工具集，他很小。加上一堆其他的骚操作，就使 Alpine达到了 3M 不到的大小


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