CentOS GRUB負(fù)責(zé)管理啟動(dòng)Linux
CentOS GRUB負(fù)責(zé)是CentOS用戶必須學(xué)習(xí)使用的，由于CentOS GRUB還有很多人不會(huì)應(yīng)用所以由我來簡(jiǎn)述說明下，至于管用否就看人品了.如何修改CentOS GRUB的開機(jī)選項(xiàng)? (OS) (Linux) (Ubuntu) (CentOS) 。CentOS Linux的使用者也不會(huì)遇到任何的版權(quán)問題。CentOS面向那些需要企業(yè)級(jí)操作系統(tǒng)穩(wěn)定性的人們，而且并不存在認(rèn)證和支持方面的開銷。
Abstract CentOS GRUB負(fù)責(zé)管理啟動(dòng)Linux還是Windows,該如何修改GRUB開機(jī)選項(xiàng)呢?
Introduction
為什么需要更改CentOS GRUB呢?
1.當(dāng)Ubuntu更新新的kernel后,GRUB會(huì)自動(dòng)加上新的kernel開機(jī)選項(xiàng),導(dǎo)致開機(jī)選項(xiàng)越來越多,想將不必要的開機(jī)選項(xiàng)刪除.
2.CentOS GRUB預(yù)設(shè)開機(jī)為Ubuntu,你可以想將預(yù)設(shè)開機(jī)改成Windows.
3.修改預(yù)設(shè)CentOS GRUB等待時(shí)間.
4.預(yù)設(shè)不顯示GRUB menu,直接進(jìn)入Windows.
假如你有以上需求,就得手動(dòng)修改GRUB開機(jī)選項(xiàng).
Solution
開啟CentOS GRUB開機(jī)選項(xiàng)檔sudo gedit /boot/grub/menu.lst
Q1.當(dāng)Ubuntu更新新的kernel后,CentOS GRUB會(huì)自動(dòng)加上新的kernel開機(jī)選項(xiàng),導(dǎo)致開機(jī)選項(xiàng)越來越多,想將不必要的開機(jī)選項(xiàng)刪除.
A1.以下為我所要的開機(jī)選項(xiàng),不需要者可自行刪除之## ## End Default Options ##
title Ubuntu, kernel 2.6.20-16-generic
root (hd0,6)
kernel /boot/vmlinuz-2.6.20-16-generic root=UUID=b923ef76-3246-411c-8095-7bca666b13a5 ro quiet splash
initrd /boot/initrd.img-2.6.20-16-generic
quiet
savedefault
title Ubuntu, kernel 2.6.20-16-generic (recovery mode)
root (hd0,6)
kernel /boot/vmlinuz-2.6.20-16-generic root=UUID=b923ef76-3246-411c-8095-7bca666b13a5 ro single
initrd /boot/initrd.img-2.6.20-16-generic
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Microsoft Windows XP Professional
root (hd0,0)
savedefault
makeactive
chainloader +1
Q2.CentOS GRUB預(yù)設(shè)開機(jī)為Ubuntu,你可以想將預(yù)設(shè)開機(jī)改成Windows.
A2.修改
## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not change this entry to 'saved' or your
# array will desync and will not let you boot your system.
default 2
預(yù)設(shè)default為 0,表示開機(jī)用Ubuntu開機(jī),因?yàn)樵谖业碾娔XWindows為第三個(gè)選項(xiàng),故default為2
Q3.修改預(yù)設(shè)CentOS GRUB等待時(shí)間.
A3.修改
## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 3
預(yù)設(shè)為10秒鐘,我改成等待3秒鐘
Q4.預(yù)設(shè)不顯示CentOS GRUB menu,直接進(jìn)入Windows.
## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
hiddenmenu
預(yù)設(shè)會(huì)顯示GRUB menu,若你不想顯示menu,要當(dāng)按下ESC才顯示,請(qǐng)將hiddenmenu前的#拿掉
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