一、Linux系統的簡介

xshlife2發表於2020-12-22

1.1 什麼是Linux
Linux是一個免費的多使用者、多工的作業系統,其執行方式、功能和Unix系統很相似,但Linux系統的穩定性、安全性與網路功能是許多商業作業系統所無法比擬的。Linux系統最大的特色是原始碼完全公開,在符合GNU/GPL(通用公共許可證)的原則下,任何人都可以自由取得、散佈甚至修改原始碼。越來越多的大中型企業的伺服器選擇了Linux作為其作業系統。近幾年來,Linux系統又以其友好的圖形介面、豐富的應用程式及低廉的價格,在桌面領域得到了較好的發展,受到了普通使用者的歡迎

1.2 產生
Linux系統的核心最早是由芬蘭大學生Linus Torvalds開發,並於1991年8月釋出。當時由於Unix系統的商業化,Andrew Tannebaum教授開發了Minix作業系統,該系統不受AT&T許可協議的約束,可以釋出在Internet上免費給全世界的學生使用,這為教學科研提供了一個作業系統。

1991年,Linus Torvalds為了給Minix系統使用者設計一個比較有效的Unix PC版本,自己動手寫了一個類Minix的作業系統,這就是Linux的雛形。

Linux的興起可以說是Internet創造的一個奇蹟。到1992年1月為止,全世界大約只有1000人在使用Linux系統,但由於它釋出在Internet上,網際網路上的任何人在任何地方都可以得到它。在這眾多熱心人的努力下,Linux系統在不到3年的時間裡成為了一個功能完善、穩定可靠的作業系統

1.3 特點
開放性

多使用者

多工

良好的使用者介面

裝置獨立性

豐富的網路功能

可靠的系統安全

良好的可移植性

1.4 組成
核心 shell 檔案系統 應用程式

1.5 Linux核心版本
核心是一個用來和硬體打交道併為使用者程式提供有限服務集的支撐軟體,是作業系統中最核心的功能框架部分。一個計算機系統是一個硬體和軟體的共生體,它們互相依賴,不可分割。

核心版本是Linux核心在歷次修改或增加相應的功能後的版本編號。核心版本號是由點分隔的3段數字組成,比如3.10.0-327

1.6 Linux發行版
一些組織和公司,將Linux系統的核心、應用軟體和文件包裝起來,並提供一些系統安裝介面、系統配置設定管理工具,就構成了Linux發行版本。發行版本的版本號每一個釋出廠商都不一樣,與Linux系統核心的版本號是相對獨立的。根據GPL準則,這些發行版本雖然都源自一個核心,但都沒有自己的版權

二、Red Hat Linux
2.1 優點
1.支援和硬體平臺多

2.優秀的安裝介面

3.獨特的RPM升級方式

4.豐富的軟體包

5.安全效能好

6.方便的系統管理介面

7.詳細而完整的線上文件

三、安裝Linux
3.1 硬體要求
(1)CPU:主流計算機和伺服器都能達到要求;

(2)記憶體:安裝Linux系統至少需要1GB記憶體(建議使用2GB甚至更高記憶體);

(3)硬碟空間:若要安裝所有軟體包至少需要10GB以上硬碟空間;

(4)顯示器和顯示卡;

(5)4DVD光碟機

硬體相容性

硬體相容性在老式電腦和組裝電腦上顯得特別重要。Linux系統與最近幾年廠家生產的多數硬體相相容,然而硬體的技術規範每天都在改變,很難保證計算機的硬體會百分之百地相容。

要檢視Red Hat硬體相容性可以訪問網址https://hardware.redhat.com,檢視眾多廠家的硬體產品

3.2 交換分割槽
直接從實體記憶體讀寫資料要比從硬碟讀寫資料快的多,而實體記憶體是有限的,這樣就使用到了虛擬記憶體。虛擬記憶體是為了滿足實體記憶體的不足而提出的一種策略,它是利用磁碟空間虛擬出的一塊邏輯記憶體,用作虛擬記憶體的磁碟空間被稱為交換分割槽(swap分割槽)。

核心會將暫時不用的記憶體塊資訊寫到交換分割槽,這樣一來,實體記憶體得到了釋放,這塊記憶體就可以用於其它用途,當需要用到原始的內容時,這些資訊會被重新從交換分割槽讀入實體記憶體。

Linux的記憶體管理採取的是分頁存取機制,為了保證實體記憶體能得到充分的利用,核心會在適當的時候將實體記憶體中不經常使用的資料塊自動交換到虛擬記憶體中,而將經常使用的資訊保留到物理存。

Linux系統會不時的進行頁面交換操作,以保持儘可能多的空閒實體記憶體,即使並沒有什麼操作需要使用記憶體,Linux也會交換出暫時不用的記憶體頁面,這可以避免等待交換所需的時間。

Linux進行頁面交換是有條件的,不是所有頁面在不用時都交換到虛擬記憶體,

Linux核心根據“最近最常使用”演算法,僅僅將一些不經常使用的頁面檔案交換到虛擬記憶體

分割槽命名方案:

Linux系統使用字母和數字的組合來指代硬碟分割槽,使用一種更加靈活的分割槽命名方案,該命名方案是基於檔案的,檔名的格式為/dev/xxyN(比如/dev/sda1分割槽)。

§/dev:這是Linux系統中所有裝置檔案所在的目錄名。因為分割槽位於硬碟上,而硬碟是裝置,所以這些檔案代表了在/dev上所有可能的分割槽;

§xx:分割槽名的前兩個字母表示分割槽所在裝置的型別,通常是hd(IDE硬碟)或sd(SCSI硬碟)。

§y:這個字母表示分割槽所在的裝置。例如,/dev/hda(第1個 IDE 硬碟)或/dev/sdb(第2個SCSI硬碟);

N:最後的數字N代表分割槽。前4個分割槽(主分割槽或擴充套件分割槽)用數字1~4表示,邏輯驅動器從5

開始。例如,/dev/hda3是第1個IDE 硬碟上的第3個主分割槽或擴充套件分割槽;/dev/sdb6是第2個SCSI硬碟上的第2個邏輯驅動器

3.3 系統硬碟知識
Linux系統中的每一個分割槽都是構成支援一組檔案和目錄所必需的儲存區的一部分。它是通過掛載來實現的,掛載是將分割槽關聯到某一目錄的過程,掛載分割槽使起始於這個指定目錄(稱為掛載目錄)的儲存區能夠被使用。

例如,如果分割槽/dev/sda5被掛載在目錄/usr上,這意味著所有在/usr下的檔案和目錄在物理上位於/dev/sda5。因此檔案/usr/bin/cal被儲存在分割槽/dev/sda5上,而檔案/etc/passwd卻不是。

/usr目錄下的目錄還有可能是其它分割槽的掛載目錄。例如,某個分割槽(如/dev/sda7)可以被掛載到/usr/local目錄下,這意味著檔案/usr/local/man/whatis將位於分割槽/dev/sda7上,而不是分割槽/dev/sda5上。

硬碟分割槽規劃

(1)最簡單的分割槽規劃

Øswap分割槽:即交換分割槽,實現虛擬記憶體,建議大小是實體記憶體的1~2倍;

Ø/boot分割槽:用來存放與Linux系統啟動有關的程式,比如引導裝載程式等,最少200MB;

Ø/分割槽:建議大小至少在10GB以上。

(2)合理的分割槽規劃

Øswap分割槽:實現虛擬記憶體,建議大小是實體記憶體的1~2倍。

Ø/boot分割槽:建議大小最少為200MB;

Ø/usr分割槽:用來存放Linux系統中的應用程式,其相關資料較多,建議大小最少為8GB;

Ø/var分割槽:用來存放Linux系統中經常變化的資料以及日誌檔案,建議大小最少為1GB;

Ø/分割槽:Linux系統的根目錄,所有的目錄都掛在這個目錄下面,建議大小最少為1GB;

Ø/home分割槽:存放普通使用者的資料,是普通使用者的宿主目錄,建議大小為剩下的空間。
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