记一次Linux无法启动|emergency mode|紧急模式

启动提示“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，我以为没有启动。其实输入密码就可以进去。

但是进入的是紧急模式，需要修复。基本上引导不进去都是自己挖的坑，也就是自己在某事某刻修改了某个与启动相关的文件或参数。

红字部分就是我改的内容

[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

正常应该这样，按照这个还原回去就行

[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