From a5876944d5ae0cf814b6a016b871d2dcc16e8a36 Mon Sep 17 00:00:00 2001
From: geminiyellow <geminiyellow@gmail.com>
Date: Tue, 9 Feb 2016 14:13:01 +0900
Subject: [PATCH] =?UTF-8?q?docs(zh-cn):=20#69=20Update=20README=20?=
 =?UTF-8?q?=E2=80=A6?=
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Adds more context and information around how to minimize image layers
---
 zh-cn/README.md | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/zh-cn/README.md b/zh-cn/README.md
index c8e9858..f9d3d3d 100644
--- a/zh-cn/README.md
+++ b/zh-cn/README.md
@@ -522,10 +522,15 @@ docker images -viz | dot -Tpng -o docker.png
 
 ### Docker 容器瘦身  [Intercity 博客](http://bit.ly/1Wwo61N)
 
-- 清理 APT
+- 在当前运行层(RUN layer)清理 APT
+
+这应当和其他 apt 命令在同一层中完成。
+否则，前面的层将会保持原有信息，而你的镜像则依旧臃肿。
+ 
 ```
-RUN apt-get clean
-RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+RUN {apt commands} \
+  && apt-get clean \  
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 ```
 - 压缩镜像
 ```