# 建立容器

### **docker run建立映像檔容器**

**Docker 利用容器來執行應用。**\
**容器是從映像檔建立的執行。它可以被啟動、開始、停止、刪除。每個容器都是相互隔離的、保證安全的平台（使用核心namespace與cgroup來達成）**<br>

**hello 我的 docker 容器**

**docker run hello-world**

<div align="left"><img src="https://lh3.googleusercontent.com/fDJiqjYo16aTLSQagkq1Z4agyKENYe6JkyHJVkRgkE53krcuDomtrLJJVnfZe6_ZKd2BI1tO4Yv0BPxyxj3Nb0zn1rrfHtYkiUbgXqOI9QlX_4vDziOk_MttcUBBJx3CVN2ntNzQ" alt=""></div>

**docker run -it --name firstubuntu ubuntu**\
**root\@4eb602fae6d4:/#（此處已經進入容器的互動界面）**<br>

**其中，-t 選項讓Docker分配一個虛擬終端（pseudo-tty）並綁定到容器的標準輸入上， -i 則讓容器的標準輸入保持打開(interactive)**\
**root\@4eb602fae6d4:/# ps**\
&#x20; **PID TTY          TIME CMD**\
&#x20;   **1 pts/0    00:00:00 bash**\
&#x20;  **10 pts/0    00:00:00 ps**\
**容器的核心為所執行的應用程式，所需要的資源都是應用程式執行所必需的。除此之外，並沒有其它的資源。可以在虛擬終端中利用 ps 來查看程式訊息**

**可以發現在此隔離空間中，只用到bash的程序，並不會像VM需求許多的程序來啟動，這種特點使得 Docker 對資源的使用率極高，是貨真價實的輕量級虛擬化**<br>


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