啟動提示“welcome to emergency mode！after logging in ，type “journalctl -xb” to view system logs，“systemctl reboot” to reboot ，“systemctl default” to try again to boot into default mode。“

然而，我以為沒有啟動。其實輸入密碼就可以進去。

但是進入的是緊急模式，需要修復。基本上引導不進去都是自己挖的坑，也就是自己在某事某刻修改了某個與啟動相關的檔案或引數。

紅字部分就是我改的內容

[root@localhost ~]# cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Thu Aug  6 23:41:00 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=5de73753-b6ff-4dfa-a0cd-e92cac8ea131 /boot                   xfs     defaults        0 0
/dev/mapper/centos-home /home                   xfs     defaults,acl        1 1
 

/dev/mapper/centos-swap swap                    swap    defaults        0 0

正常應該這樣，按照這個還原回去就行

[root@localhost ~]# cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Thu Aug  6 23:41:00 2020
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=5de73753-b6ff-4dfa-a0cd-e92cac8ea131 /boot                   xfs     defaults        0 0
/dev/mapper/centos-home /home                   xfs     defaults        0 0
 

/dev/mapper/centos-swap swap                    swap    defaults        0 0