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Linux挂载或者卸载磁盘指南(ext4)

  • 2026-02-27 11:35:27
Linux挂载或者卸载磁盘指南(ext4)
1、创建的虚拟机默认一个系统盘
lsblk
2、添加一个磁盘来作为数据盘挂载演示
3、把这块硬盘格式化为 ext4 文件系统

ext4是 Linux 最常用、最稳定的 文件系统格式。

mkfs.ext4 /dev/sdb

4、创建数据存储目录

mkdir /datah

5、挂载数据目录

mount /dev/sdb /datah

6、查磁盘 UUID、用来写挂载配置（fstab）

ls -l /dev/disk/by-uuid/ |grep sdbblkid |grep sdb

7、挂载配置参数

/etc/fstab：Linux 系统的核心配置文件，记录了所有需要开机自动挂载的文件系统 / 磁盘信息，系统启动时会读取这个文件来挂载磁盘。
echo UUID=75bbd48b-c848-4ce3-af7b-9161d88cd0eb /datah ext4 defaults 0 0 >> /etc/fstab

8、测试配置是否正确

mount -a
如果没有报错，说明配置没问题；有报错要立刻修改 fstab，否则可能导致系统无法开机。

9、卸载挂载目录

umount /datahvi /etc/fstab  # 删除对应写入的挂载点配置
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  1. CONNECT:[ UseTime:0.000869s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001644s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006056s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002566s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000717s ]
  6. SELECT * FROM `set` [ RunTime:0.000273s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000708s ]
  8. SELECT * FROM `article` WHERE `id` = 476416 LIMIT 1 [ RunTime:0.002327s ]
  9. UPDATE `article` SET `lasttime` = 1772253715 WHERE `id` = 476416 [ RunTime:0.016736s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000275s ]
  11. SELECT * FROM `article` WHERE `id` < 476416 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 476416 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000794s ]
  13. SELECT * FROM `article` WHERE `id` < 476416 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001754s ]
  14. SELECT * FROM `article` WHERE `id` < 476416 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009254s ]
  15. SELECT * FROM `article` WHERE `id` < 476416 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.034597s ]
0.246136s