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                # 3.1 linux啟動過程分析 分析啟動過程的主要目的是為了以后設置oarcle數據庫的自啟動級自動關閉。 Linux的啟動過程大致可以分為以下步驟。 1. 機器加點自檢 2. 啟動Grub引導程序 3. 啟動init進程 ## 3.1.1 grub.conf文件 grub程序讀取/boot/grub/grub.conf文件,在屏幕上顯示此配置文件中的可啟動內核的列表。根據在grub啟動菜單中用戶所選擇的內核,轉到磁盤相應位置,加載內核。 下面是筆者機器上grub.conf文件的內容: ``` [root@localhost ~]# grep SwapTotal /proc/meminfo SwapTotal: 2097148 kB [root@localhost ~]# cd /boot/grub [root@localhost grub]# pwd /boot/grub [root@localhost grub]# ls splash.xpm.gz [root@localhost grub]# ls -a . .. splash.xpm.gz [root@localhost grub]# cat grub.conf cat: grub.conf: 沒有那個文件或目錄 [root@localhost grub]# ``` ## 3.1.2 initab文件 下面解釋/etc/initab文件中每部分的內容; ``` [root@localhost grub]# cat /etc/inittab # inittab is no longer used when using systemd. # # ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. # # Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target # # systemd uses 'targets' instead of runlevels. By default, there are two main targets: # # multi-user.target: analogous to runlevel 3 # graphical.target: analogous to runlevel 5 # # To view current default target, run: # systemctl get-default # # To set a default target, run: # systemctl set-default TARGET.target # ``` 這里就夠了
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