ubuntu 未分配空间磁盘扩容

安装ubuntu时，如果选择的是自动分组，就会按照逻辑卷的形式来分区，并且只分配100G其余的并不会被分配

下面将Ubuntu 磁盘未分配空间进行全挂载

查看磁盘现状

查看挂载信息

根目录挂载了97G

root@ubuntu:/home/johnny/gitea# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              795M  1.5M  793M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   97G  6.6G   86G   8% /
tmpfs                              3.9G     0  3.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sda2                          2.0G   94M  1.7G   6% /boot
tmpfs                              795M   12K  795M   1% /run/user/1000

查看磁盘信息

sda3一共是198G，实际ubuntu–vg-ubuntu–lv挂载了99G

root@ubuntu:/home/johnny/gitea# lsblk
NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
loop0                       7:0    0  44.3M  1 loop /snap/snapd/23258
loop1                       7:1    0  73.9M  1 loop /snap/core22/1722
loop2                       7:2    0 139.6M  1 loop /snap/docker/2963
sda                         8:0    0   200G  0 disk 
├─sda1                      8:1    0     1M  0 part 
├─sda2                      8:2    0     2G  0 part /boot
└─sda3                      8:3    0   198G  0 part 
  └─ubuntu--vg-ubuntu--lv 252:0    0    99G  0 lvm  /
sr0                        11:0    1  1024M  0 rom  

挂载未分配空间

采用 LV(Logical Volume) 使用全部 VG(Volume Group)
命令 vgdisplay 可以查看lvm卷组的信息；

root@ubuntu:/home/johnny/gitea# vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <198.00 GiB
  PE Size               4.00 MiB
  Total PE              50687
  Alloc PE / Size       25343 / <99.00 GiB
  Free  PE / Size       25344 / 99.00 GiB
  VG UUID               JkHV8i-gcYv-xxxx-8fdj-xxxx-ezsq-xxxxxx

看到 Free PE / Size > 0，表示还有扩容空间。

使用 lvresize 扩容剩下所有空间。

   
root@ubuntu:/home/johnny/gitea# lvresize -l  +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
  Size of logical volume ubuntu-vg/ubuntu-lv changed from <99.00 GiB (25343 extents) to <198.00 GiB (50687 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

执行resize2fs使扩容生效

注意：执行这个命令以上修改才会生效的！

root@ubuntu:/home/johnny/gitea# resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.47.0 (5-Feb-2023)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required
old_desc_blocks = 13, new_desc_blocks = 25
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 51903488 (4k) blocks long.

查看结果

root@ubuntu:/home/johnny/gitea# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              795M  1.5M  793M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  195G  6.6G  179G   4% /
tmpfs                              3.9G     0  3.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sda2                          2.0G   94M  1.7G   6% /boot
tmpfs                              795M   12K  795M   1% /run/user/1000
root@ubuntu:/home/johnny/gitea# vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <198.00 GiB
  PE Size               4.00 MiB
  Total PE              50687
  Alloc PE / Size       50687 / <198.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               JkHV8i-gcYv-xxxx-8fdj-xxxx-ezsq-xxxxxx

参考：
https://www.cnblogs.com/guangdelw/p/17822292.html
https://blog.csdn.net/weixin_43896211/article/details/144455267