ubuntu虚拟在扩展硬盘后重启后进入emergency mode

You are in emergency mode， After logging in，type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" or "exit" to boot into default mode

1. 输入root密码进入命令行操作界面

lsblk

 发现新扩展的硬盘没有mount成功

2. 创建LVM逻辑卷

#创建物理卷
root@ubuntu:/ pvcreate /dev/sda2
Physical volume "dev/sda2" successfullly created.#查看物理卷信息
root@ubuntu:/ pvsPV          VG Fmt    Attr  PSize  PFree/dev/sda2      lvm2   ---   60.00g 60.00g#创建卷组
root@ubuntu:/ vgcreate vg-mapper /dev/sda2
Volume group "vg-mapper" successfully created.#查看卷组信息
root@ubuntu:/ vgsVG        #PV #LV #SN Attr   VSize  VFreevg_mapper   1   0   0 wz--n- 60.00g 60.00g#创建逻辑卷
root@ubuntu:/$ lvcreate -n lvm-new -L 60G vg_mapper 
Logical volume "lvm-new" created.#查看逻辑卷信息
root@ubuntu:/$ lvsLV      VG        Attr      LSize   Pool Origin Data% Meta%  Move Log Cpy%Sync Convertlvm-new vg_mapper -wi-a---- 60.00g#创建文件系统
root@ubuntu:/ mkfs.ext4 /dev/vg-mapper/lvm-new#创建目录并将文件系统挂在上
root@ubuntu:/ mkidr /extra
root@ubuntu:/ mount /dev/vg-mapper/lvm-new /extraroot@ubuntu:/ df -h

3. 修改文件系统表fstab

vim /etc/fstab#把刚创建的逻辑卷加入
/dev/vg-mapper/lvm-new /extra   ext4 defaults 0 0

检查能否mount成功

umount /extra
mount -adf -h

 4. 重启进入系统

systemctl reboot