> For the complete documentation index, see [llms.txt](https://philipzheng.gitbook.io/docker_practice/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://philipzheng.gitbook.io/docker_practice/image/list.md).

# 列出

使用 `docker images` 顯示本機已有的映像檔。

```
$ sudo docker images
REPOSITORY       TAG      IMAGE ID      CREATED      VIRTUAL SIZE
ubuntu           12.04    74fe38d11401  4 weeks ago  209.6 MB
ubuntu           precise  74fe38d11401  4 weeks ago  209.6 MB
ubuntu           14.04    99ec81b80c55  4 weeks ago  266 MB
ubuntu           latest   99ec81b80c55  4 weeks ago  266 MB
ubuntu           trusty   99ec81b80c55  4 weeks ago  266 MB
...
```

在列出訊息中，可以看到幾段文字訊息

* 來自於哪個倉庫，比如 ubuntu
* 映像檔的標記，比如 14.04
* 它的 `ID` 號（唯一）
* 建立時間
* 映像檔大小

其中映像檔的 `ID` 唯一標識了映像檔，注意到 `ubuntu:14.04` 和 `ubuntu:trusty` 具有相同的映像檔 `ID`，說明它們實際上是同一映像檔。

`TAG` 用來標記來自同一個倉庫的不同映像檔。例如 `ubuntu` 倉庫中有多個映像檔，通過 `TAG` 來區分發行版本，例如 `10.04`、`12.04`、`12.10`、`13.04`、`14.04` 等。例如下面的命令指定使用映像檔 `ubuntu:14.04` 來啟動一個容器。

```
$ sudo docker run -t -i ubuntu:14.04 /bin/bash
```

如果沒有指定 `TAG`，預設使用 `latest`


---

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