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              Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】

              在Linux中,一切皆文件。作為Linux系統學習的基礎知識,掌握這項內容是對Linux運維工程師的基本要求。今天我們整理了一些相關的文件系統內容,希望通過較高的層次來對文件系統進行解析,幫助大家更加深入的理解。


              【Linux每日一個知識點第76期】Linux文件系統有哪些必備知識?

              1.Linux磁盤分區和目錄

              ??Linux發行版本之間的差別很少,差別主要表現在系統管理的特色工具以及軟件包管理方式的不同。目錄結構基本上都是一樣的。?Windows的文件結構是多個并列的樹狀結構,最頂部的是不同的磁盤(分區),如:C,D,E,F等。

              Linux的文件結構是單個的樹狀結構.可以用tree進行展示。?在Ubuntu下安裝tree(sudo apt-get install tree),并可通過命令來查看。

              每次安裝系統的時候我們都會進行分區,Linux下磁盤分區和目錄的關系如下:

              –??????任何一個分區都必須掛載到某個目錄上。

              –??????目錄是邏輯上的區分。分區是物理上的區分。

              –??????磁盤Linux分區都必須掛載到目錄樹中的某個具體的目錄上才能進行讀寫操作。

              –??????根目錄是所有Linux的文件和目錄所在的地方,需要掛載上一個磁盤分區。

              以下是我們可能存在的一種目錄和分區關系:

              Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】

              ?圖1:目錄和分區關系

              Q:如何查看分區和目錄及使用情況?

              –??????fdisk查看硬盤分區表

              –??????df:查看分區使用情況

              –??????du:?查看文件占用空間情況

              Q:?為什么要分區,如何分區?

              –??????可以把不同資料,分別放入不同分區中管理,降低風險。

              –??????大硬盤搜索范圍大,效率低

              –??????磁盤配合只能對分區做設定

              –??????/home /var /usr/local經常是單獨分區,因為經常會操作,容易產生碎片

              2.Mount掛載和NFS簡介

              掛載的概念?:當要使用某個設備時,例如要讀取硬盤中的一個格式化好的分區、光盤或軟件等設備時,必須先把這些設備對應到某個目錄上,而這個目錄就稱為“掛載點(mount point)”,這樣才可以讀取這些設備,而這些對應的動作就是“掛載”。?將物理分區細節屏蔽掉。用戶只有統一的邏輯概念。所有的東西都是文件。Mount命令可以實現掛載:

              mount [-fnrsvw] [-t vfstype] [-o options] device dir

              Q:所有的磁盤分區都必須被掛載上才能使用,那么我們機器上的硬盤分區是如何被掛載的?

              A:這主要是它利用了/etc/fstab文件。每次內核加載它知道從這里開始mount文件系統。每次系統啟動會根據該文件定義自動掛載。若沒有被自動掛載,分區將不能使用。?如下是我的/etc/fstab的定義,主要是根據裝機的分區來的:

              # <file system> <mount point>???<type>??<options>???????<dump>??<pass>

              proc????????????/proc???????????proc????defaults????????0???????0

              #/dev/sda1被自動掛載到??/

              UUID=cb1934d0-4b72-4bbf-9fad-885d2a8eeeb1 /???????????????ext3????relatime,errors=remount-ro 0???????1

              # /dev/sda5?被自動掛載到分區/home

              UUID=c40f813b-bb0e-463e-aa85-5092a17c9b94 /home???????????ext3????relatime????????0???????2

              #/dev/sda7?被自動掛載到/work

              UUID=0f918e7e-721a-41c6-af82-f92352a568af /work???????????ext3????relatime????????0???????2

              #分區?/dev/sda6被自動掛載到swap

              UUID=2f8bdd05-6f8e-4a6b-b166-12bb52591a1f none????????????swap????sw??????????????0???????0

              Q:移動硬盤如何掛載?如何掛載一個新的分區?

              移動硬盤有驅動模塊會自動掛載,如果有個新硬盤,要先進行分區,并通過mount命令掛載到某個文件夾。如果要自動掛載則可以修改/etc/fstab文件.

              NFS簡介:NFS相信在很多地方都有廣泛使用,是一個非常好的文件共享方式。我們公司所使用的上傳服務就是把文件上傳到某臺網絡服務器上,中間就是通過NFS實現。

              使用NFS客戶端可以透明的地訪問服務器端的文件。NFS也是通過mount來實現,底層是通過NFS通信協議實現。基本原理:

              Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】

              圖2:NFS基本原理

              Ubuntu下面Ubuntu下的例子

              服務端:

              $apt-get install nfs-kernel-server

              vi /etc/exports?添加nfs目錄: /personal/nfs_share

              10.1.60.34(rw,sync,no_root_squash)

              $sudo exportfs -r

              $sudo /etc/init.d/portmap start

              $sudo /etc/init.d/nfs-kernel-server start

              客戶端:

              $sudo apt-get install nfs-common

              $sudo mount 10.19.34.76:/personal/nfs_share ~/nfsshare例子:

              3.文件類型

              Linux下面的文件類型主要有:

              1. a)普通文件:C語言元代碼、SHELL腳本、二進制的可執行文件等。分為純文本和二進制。
              2. b)目錄文件:目錄,存儲文件的唯一地方。
              3. c)鏈接文件:指向同一個文件或目錄的的文件。
              4. d)特殊文件:與系統外設相關的,通常在/dev下面。分為塊設備和字符設備。

              可以通過ls –l, file, stat幾個命令來查看文件的類型等相關信息。

              4.文件存儲結構

              Linux正統的文件系統(如ext2、ext3)一個文件由目錄項、inode和數據塊組成。

              目錄項:包括文件名和inode節點號。

              Inode:又稱文件索引節點,是文件基本信息的存放地和數據塊指針存放地。

              數據塊:文件的具體內容存放地。

              Linux正統的文件系統(如ext2、3等)將硬盤分區時會劃分出目錄塊、inode Table區塊和data block數據區域。一個文件由一個目錄項、inode和數據區域塊組成。Inode包含文件的屬性(如讀寫屬性、owner等,以及指向數據塊的指針),數據區域塊則是文件內容。當查看某個文件時,會先從inode table中查出文件屬性及數據存放點,再從數據塊中讀取數據。

              站在2w英尺視圖,文件存儲結構大概如下:

              Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】

              圖3:文件存儲結構2w英尺視圖

              其中目錄項的結構如下(每個文件的目錄項存儲在改文件所屬目錄的文件內容里):

              Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】
              ?圖4:目錄項結構?

              其中文件的inode結構如下(inode里所包含的文件信息可以通過stat filename查看得到):

              ?Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】

              圖5:inode結構

              以上只反映大體的結構,linux文件系統本身在不斷發展。但是以上概念基本是不變的。且如ext2、ext3、ext4文件系統也存在很大差別,如果要了解可以查看專門的文件系統介紹。

              5.軟連接、硬鏈接

              軟鏈接和硬鏈接是我們常見的兩種概念:

              硬連接:是給文件一個副本,同時建立兩者之間的連接關系。修改其中一個,與其連接的文件同時被修改。如果刪除其中[color=red]任意一個[/color]其余的文件將不受影響。

              軟連接:也叫符號連接,他只是對源文件在新的位置建立一個“快捷(借用一下wondows常用詞)”,所以,當源文件刪除時,符號連接的文件將成為無源之水->僅僅剩下個文件名了,當然刪除這個連接,也不會影響到源文件,但對連接文件的使用、引用都是直接調用源文件的。

              具體關系可以看下圖:

              Linux文件系統有哪些必備知識?【Linux每日一個知識點第76期】

              圖5:軟鏈接和硬鏈接

              從圖上可以看出硬鏈接和軟鏈接的區別:

              1:硬鏈接原文件和新文件的inode編號一致。而軟鏈接不一樣。

              2:對原文件刪除,會導致軟鏈接不可用,而硬鏈接不受影響。

              3:對原文件的修改,軟、硬鏈接文件內容也一樣的修改,因為都是指向同一個文件內容的。


              《Linux學習每日一個知識點》欄目是馬哥教育Linux云計算年薪20萬+的學員社群特別發起,分享Linux工具、Linux語法、Linux項目等知識點,幫助大家快速的了解Linux學習,快速步入Linux高薪的快車道。

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