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              想做年薪20萬招聘人才,先看會不會這28個Linux運維崗經典面試題

              今天給大家分享的是Linux運維的28道面試題,總的來說是一些比較經典的題目,而且大部分面試的時候都會用到,所以值得大家關注。

              1、Linux如何掛載windows下的共享目錄?
              mount.cifs //IP地址/server /mnt/server -o user=administrator,password=123456
              linux 下的server需要自己手動建一個 后面的user與pass 是windows主機的賬號和密碼 注意空格 和逗號

              2、如何查看http的并發請求數與其TCP連接狀態?
              netstat -n | awk ‘/^tcp/ {++b[$NF]}’ END {for(a in b) print a,b[a]}’

              還有ulimit -n 查看linux系統打開最大的文件描述符,這里默認1024,不修改這里web服務器修改再大也沒用。若要用就修改很幾個辦法,這里說其中一個:
              修改/etc/security/limits.conf
              * soft nofile 10240
              * hard nofile 10240
              重啟后生效

              3、如何用tcpdump嗅探80端口的訪問看看誰最高?
              tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk -F”.” ‘{print $1″.”$2″.”$3″.”$4″.”}’ | sort |uniq -c | sort -nr | head-5

              4、如何查看/var/log目錄下的文件數?
              ls /var/log/ -1R | grep “-” | wc -l

              5、如何查看Linux系統每個ip的連接數?
              netstat -n | awk ‘/^tcp/ {print $5}’ | awk -F: ‘{print $1}’ | sort | uniq -c | sort -rn

              6、shell下生成32位隨機密碼
              cat /dev/urandom | head -1 | md5sum | head -c 32 >> /pass

              7、統計出apache的access.log中訪問量最多的5個ip
              cat access.log | awk ‘{print $1}’ | sort | uniq -c | sort -n -r | head -5

              8、如何查看二進制文件的內容?
              我們一般通過hexdump命令 來查看二進制文件的內容。
              hexdump -C XXX(文件名) -C是參數 不同的參數有不同的意義
              -C 是比較規范的 十六進制和ASCII碼顯示
              -c 是單字節字符顯示
              -b 單字節八進制顯示
              -o 是雙字節八進制顯示
              -d 是雙字節十進制顯示
              -x 是雙字節十六進制顯示

              9、ps aux 中的VSZ代表什么意思,RSS代表什么意思?
              VSZ:虛擬內存集,進程占用的虛擬內存空間
              RSS:物理內存集,進程戰用實際物理內存空間

              10、如何檢測并修復/dev/hda5?
              fsck用來檢查和維護不一致的文件系統。若系統掉電或磁盤發生問題,可利用fsck命令對文件系統進行檢查

              11、介紹下Linux系統的開機啟動順序
              加載BIOS–>讀取MBR–>Boot Loader–>加載內核–>用戶層init一句inittab文件來設定系統運行的等級(一般3或者
              5,3是多用戶命令行,5是界面)–>init進程執行rc.syninit–>啟動內核模塊–>執行不同級別運行的腳本程序–>執行/etc/rc.d/rc.local(本地運行服務)–>執行/bin/login,就可以登錄了。

              12、符號鏈接與硬鏈接的區別
              我們可以把符號鏈接,也就是軟連接 當做是 windows系統里的 快捷方式。
              硬鏈接 就好像是 又復制了一份,舉例說明:
              ln 3.txt 4.txt 這是硬鏈接,相當于復制,不可以跨分區,但修改3,4會跟著變,若刪除3,4不受任何影響。
              ln -s 3.txt 4.txt 這是軟連接,相當于快捷方式。修改4,3也會跟著變,若刪除3,4就壞掉了。不可以用了。

              13、保存當前磁盤分區的分區表
              dd 命令是以個強大的命令,在復制的同時進行轉換
              dd if=/dev/sda of=./mbr.txt bs=1 count=512

              14、如何在文本里面進行復制、粘貼,刪除行,刪除全部,按行查找和按字母查找?
              以下操作全部在命令行狀態操作,不要在編輯狀態操作。
              在文本里 移動到想要復制的行 按yy 想復制到哪就移動到哪,然后按P 就黏貼了
              刪除行 移動到改行 按dd
              刪除全部 dG 這里注意G一定要大寫
              按行查找 :90 這樣就是找到第90行
              按字母查找 /path 這樣就是 找到path這個單詞所在的位置,文本里可能存在多個,多次查找會顯示在不同的位置。

              15、手動安裝grub
              grub-install /dev/sda

              16、修改內核參數
              vi /etc/sysctl.conf 這里修改參數
              sysctl -p 刷新后可用

              17、在1-39內取隨機數
              expr $[RANDOM%39] +1
              RANDOM隨機數
              %39取余數范圍0-38

              18、限制apache每秒新建連接數為1,峰值為3
              每秒新建連接數 一般都是由防火墻來做,apache本身好像無法設置每秒新建連接數,只能設置最大連接:
              iptables -A INPUT -d 172.16.100.1 -p tcp –dport 80 -m limit –limit 1/second -j ACCEPT

              19、FTP的主動模式和被動模式
              FTP協議有兩種工作方式:PORT方式和PASV方式,中文意思為主動式和被動式。

              PORT(主動)方式的連接過程是:客戶端向服務器的FTP端口(默認是21)發送連接請 求,服務器接受連接,建立一條命令鏈路。當需要傳送數據時,客戶端在命令鏈路上用PORT 命令告訴服務器:“我打開了XX端口,你過來連接我”。于是服務器從20端口向客戶端的 XX端口發送連接請求,建立一條數據鏈路來傳送數據。

              PASV(被動)方式的連接過程是:客戶端向服務器的FTP端口(默認是21)發送連接請 求,服務器接受連接,建立一條命令鏈路。當需要傳送數據時,服務器在命令鏈路上用PASV 命令告訴客戶端:“我打開了XX端口,你過來連接我”。于是客戶端向服務器的XX端口 發送連接請求,建立一條數據鏈路來傳送數據。
              從上面可以看出,兩種方式的命令鏈路連接方法是一樣的,而數據鏈路的建立方法就完 全不同。

              20、顯示/etc/inittab中以#開頭,且后面跟了一個或者多個空白字符,而后又跟了任意非空白字符的行
              grep “^#\{1,\}[^]” /etc/inittab

              21、顯示/etc/inittab中包含了:一個數字:(即兩個冒號中間一個數字)的行
              grep “\:[0-9]\{1\}:” /etc/inittab

              22、怎么把腳本添加到系統服務里,即用service來調用?
              在腳本里加入
              #!/bin/bash
              # chkconfig: 345 85 15
              # description: httpd
              然后保存
              chkconfig httpd –add 創建系統服務
              現在就可以使用service 來 start or restart

              23、寫一個腳本,實現批量添加20個用戶,用戶名為user01-20,密碼為user后面跟5個隨機字符

              #!/bin/bash
              #description: useradd
              for i in `seq -f”%02g” 1 20`;do
              useradd user$i
              echo “user$i-`echo $RANDOM|md5sum|cut -c 1-5`”|passwd –stdinuser$i >/dev/null 2>&1
              done

              24、寫一個腳本,實現判斷192.168.1.0/24網絡里,當前在線的IP有哪些,能ping通則認為在線

              #!/bin/bash
              for ip in `seq 1 255`
              do
              ping -c 1 192.168.1.$ip > /dev/null 2>&1
              if [ $? -eq 0 ]; then
              echo 192.168.1.$ip UP
              else
              echo 192.168.1.$ip DOWN
              fi
              }&
              done
              wait

              25、寫一個腳本,判斷一個指定的腳本是否是語法錯誤;如果有錯誤,則提醒用戶鍵入Q或者q無視錯誤并退出其它任何鍵可以通過vim打開這個指定的腳本

              [root@localhost tmp]# cat checksh.sh
              #!/bin/bash
              read -p “please input check script-> ” file
              if [ -f $file ]; then
              sh -n $file > /dev/null 2>&1
              if [ $? -ne 0 ]; then
              read -p “You input $file syntax error,[Type q to exit or Type vim to edit]” answer
              case $answer in
              q | Q)
              exit 0
              ;;
              vim )
              vim $file
              ;;
              *)
              exit 0
              ;;
              esac
              fi
              else
              echo “$file not exist”
              exit 1
              fi

              26、寫一個腳本,要求如何:

              創建一個函數,能接受兩個參數:
              1)第一個參數為URL,即可下載的文件;第二個參數為目錄,即下載后保存的位置;
              2)如果用戶給的目錄不存在,則提示用戶是否創建;如果創建就繼續執行,否則,函數返回一個51的錯誤值給調用腳本;
              3)如果給的目錄存在,則下載文件;下載命令執行結束后測試文件下載成功與否;如果成功,則返回0給調用腳本,否則,返回52給調用腳本;

              [root@localhost tmp]# cat downfile.sh
              #!/bin/bash
              url=$1
              dir=$2
              download()
              {
              cd $dir >> /dev/null 2>&1
              if [ $? -ne 0 ];then
              read -p “$dir No such file or directory,create?(y/n)” answer
              if [ “$answer” == “y” ];then
              mkdir -p $dir
              cd $dir
              wget $url 1> /dev/null 2>&1
              else
              return “51”
              fi
              fi
              if [ $? -ne 0 ]; then
              return “52”
              fi
              }
              download $url $dir
              echo $?

              27、寫一個腳本,詳細需求如下:

              1、創建一個函數,可以接受一個磁盤設備路徑(如/dev/sdb)作為參數;在真正開始后面步驟之前提醒用戶有危險,并讓用戶選擇是否繼續;而后將此磁盤設備上的所有分區清空(提示,使用命令dd if=/dev/zero of=/dev/sdb bs=512 count=1實現,注意其中的設備路徑不要寫錯了;
              如果此步驟失敗,返回67給主程序;
              接著在此磁盤設備上創建兩個主分區,一個大小為100M,一個大小為1G;如果此步驟失敗,返回68給主程序;
              格式化此兩分區,文件系統類型為ext3;如果此步驟失敗,返回69給主程序;
              如果上述過程都正常,返回0給主程序;

              2、調用此函數;并通過接收函數執行的返回值來判斷其執行情況,并將信息顯示出來;

              local Darray=(`ls /dev/sd[a-z]`)
              for i in ${Darray};do
              [[ “$i” == “$1” ]] && Sd=$i &&break
              done
              else
              return66
              fi

              #當匹配成功,進入選擇,告訴用戶,是否繼續,輸錯的話進入無限循環,當用戶選擇Y,則清空目標分區,且跳出while循環

              while :;do
              read -p “Warning!!!This operation will clean $Sd data.Next=y,Quit=n [y|n]:” Choice
              case $Choice in
              y)
              dd if=/dev/zero of=$Sd bs=512 count=1 &> /dev/null &&break || return 67 ;;
              n)
              exit 88 ;;
              *)
              echo “Invalid choice,please choice again.” ;;
              esac
              done

              #使用echo傳遞給fdisk進行分區,如果此命令失敗,則跳轉出去,錯誤值68,需要注意的是,有時候這個返回值很詭異,筆者之前成功與否都是返回的1,后來重啟之后,就好了,如果慎重的話,可以對創建的分區,進行判斷,不過就需要使用其他工具截取相關字段了,雖有些小麻煩,但無大礙

              echo-e “n\np\n1\n\n+100M\nn\np\n2\n\n+1024M\nw\n”|fdisk /dev/sdb&> /dev/null || || return 68

              #格式化之前,讓內核重新讀取磁盤分區表,值得注意的是,有的系統版本,使用partprobe無效,譬如筆者的環境是rhel5.8,而rhel6.0以后,這個命令就很危險了,而使用partx -a /dev/sdb則效果更好…此項需慎重,如果格式化失敗,則告知把失敗的分區定義成變量,且跳出函數,并帶出錯誤值69

              `partprobe`
              Part=`fdisk -l /dev/$Sd|tail -2|cut -d” ” -f1`
              for M in ${Part};do
              mke2fs -j $M &> /dev/null && ErrorPart=$M &&return 69
              done
              return 0
              }

              #下面代碼,調用函數,接收函數返回值,根據返回值進行判斷哪里出錯。

              Disk_Mod $1
              Res=$?
              [ $Res-eq 0 ] && exit 0
              [ $Res-eq 66 ] && echo “Error! Invalid input.”
              [ $Res-eq 67 ] && echo “Error! Command -> dd fdisk mke2fs

              28、如何讓history命令顯示具體時間?
              HISTTIMEFORMAT=”%Y-%m-%d %H:%M:%S”
              export HISTTIMEFORMAT
              重新開機后會還原,可以寫/etc/profile

              看完了這些題,哪些是你會的,哪些是你不會的呢?如果又不會的地方就要盡快開始查漏補缺,完成知識補充了~

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