CentOS6.x和CentOS7.X启动系统不显示进度条设置方法

[root@ok Desktop]# vi /boot/grub/grub.conf

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/mapper/vg_ok-lv_root
#          initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.32-573.22.1.el6.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.32-573.22.1.el6.x86_64 ro root=/dev/mapper/vg_ok-lv_root rd_NO_LUKS rd_LVM_LV=vg_ok/lv_root LANG=en_US.UTF-8 rd_LVM_LV=vg_ok/lv_swap rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=128M  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet#去掉 rhgb quie(启动过程就是命令行的方式显示)
        initrd /initramfs-2.6.32-573.22.1.el6.x86_64.img
title CentOS 6 (2.6.32-573.el6.x86_64)
        root (hd0,0)
@
"/boot/grub/grub.conf " 21L, 1170C

注意：grub.conf不一定在/boot/grub/下，在centos6.7中

[root@bass ~]# find / -name grub.conf
/boot/efi/EFI/redhat/grub.conf
/etc/grub.conf
[root@bass ~]# ll /etc/grub.conf
lrwxrwxrwx. 1 root root 32 May  5 01:20 /etc/grub.conf -> ../boot/efi/EFI/redhat/grub.conf

CentOS7.X要去点99行和113行的rhgb quiet下面的一组是去掉后

[root@centos7 ~]# egrep linux16 -n --color /boot/grub2/grub.cfg.bak 
99:    linux16 /vmlinuz-3.10.0-514.el7.x86_64 root=/dev/mapper/cl-root ro crashkernel=auto rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet LANG=en_US.UTF-8
113:    linux16 /vmlinuz-0-rescue-d3f7c9792f7c1d930a40afdba2cd28da root=/dev/mapper/cl-root ro crashkernel=auto rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet
[root@centos7 ~]# egrep linux16 -n --color /boot/grub2/grub.cfg
99:    linux16 /vmlinuz-3.10.0-514.el7.x86_64 root=/dev/mapper/cl-root ro crashkernel=auto rd.lvm.lv=cl/root rd.lvm.lv=cl/swap LANG=en_US.UTF-8
113:    linux16 /vmlinuz-0-rescue-d3f7c9792f7c1d930a40afdba2cd28da root=/dev/mapper/cl-root ro crashkernel=auto rd.lvm.lv=cl/root rd.lvm.lv=cl/swap