ubuntu20.04设置开机自动挂载

总结：

1.硬盘被lvm拆分后，就算重装系统（未格式化PV盘），系统重装后，硬盘的PE依然存在

2.开机自动挂载可以自动挂载物理盘、LVM等

3.如果LVM硬盘松动，导致LVM读盘失败，可以重启机器，重新挂载LVM（不用格式化），只要不再是物理损伤，数据会依然存在

4.杀掉所有跟该硬盘挂钩的进程（危险，可不操作）

# /mnt/ssd1 表示杀掉正在使用/mnt/ssd1的所有进程
fuser -ck /mnt/ssd1

下面开始挂盘：

前提条件：

（1）准备好挂载目录

mkdir /mnt/data

（2）准备好硬盘

lsblk # 查看硬盘

（3）硬盘（或者LVM的LV）必须初始化好格式，查看硬盘UUID

#sudo blkid
/dev/mapper/vgnb-lvnb: UUID="f160543c-339f-4c55-a4f7-02f18dcede16" TYPE="xfs"

# 说明：
# 硬盘：/dev/mapper/vgnb-lvnb    相当于物理硬盘，这里是LVM盘 
# UUID：f160543c-339f-4c55-a4f7-02f18dcede16
# xfs：硬盘初始化格式

操作：

修改/etc/fstab

sudo vim /etc/fstab

# 打开文件内容如下

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda3 during curtin installation
/dev/disk/by-uuid/b6f628e3-01b4-4daf-bc42-3746fd0399c4 / ext4 defaults 0 0
# /boot was on /dev/sda2 during curtin installation
/dev/disk/by-uuid/4f9cf980-0afc-465e-93ce-8aeac3f2700c /boot ext4 defaults 0 0
# /boot/efi was on /dev/sda1 during curtin installation
/dev/disk/by-uuid/2F89-0190 /boot/efi vfat defaults 0 0
/swap.img       none    swap    sw      0       0

在最后一行后面追加自动挂载盘

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda3 during curtin installation
/dev/disk/by-uuid/b6f628e3-01b4-4daf-bc42-3746fd0399c4 / ext4 defaults 0 0
# /boot was on /dev/sda2 during curtin installation
/dev/disk/by-uuid/4f9cf980-0afc-465e-93ce-8aeac3f2700c /boot ext4 defaults 0 0
# /boot/efi was on /dev/sda1 during curtin installation
/dev/disk/by-uuid/2F89-0190 /boot/efi vfat defaults 0 0
/swap.img       none    swap    sw      0       0

# 追加这行自动挂载：注意，这里的UUID=后面不要有引号
# UUID=f160543c-339f-4c55-a4f7-02f18dcede16 表示要挂载的盘的UUID
# /mnt/data 表示要挂载到哪个目录
# xfs 硬盘格式
# defaults 
UUID=f160543c-339f-4c55-a4f7-02f18dcede16 /mnt/data xfs defaults 0 2

使之生效：

sudo mount -a

设置好之后，重启服务器，就会自动挂载了