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                            > 問題1：宿主機中啟動了3個docker nginx容器，假設一個nginx容器運行環境占用100MB，3個容器全部啟動會占用多少磁盤空間。

1、同時啟動3個容器
![](https://img.kancloud.cn/c1/e3/c1e3573a5d9578a55249bf327e889699_1202x310.png)
2、查看到這些容器的`LowerDir`下面容器所依賴的最底層鏡像層目錄，發現三個容器的最底層鏡像都是一樣的：`/var/lib/docker/overlay2/5160f86fbe7acce3826ed5c7d1acdb351b931d67978b1c91138d86b7eef8d0ab/diff"`
![](https://img.kancloud.cn/63/63/6363db4800e38e742065c8efb07564eb_1867x423.png)
<nr>
<br>

**結論：** 說明這三個容器共用的同一個底層鏡像文件（也就是操作系統），因此，就算Nginx鏡像有100MB，啟動了N個，也不會占用 100 * N的磁盤空間。


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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