ubuntu磁盘空间扩展小记

装ubuntu22，使用时发现根文件系统空间不够，随即查看

root@root:/dev/ubuntu-vg# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              3.2G  1.7M  3.2G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   98G   93G     0 100% /
tmpfs                               16G     0   16G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sda2                          2.0G  130M  1.7G   8% /boot
/dev/sda1                          1.1G  6.1M  1.1G   1% /boot/efi
tmpfs                              3.2G  4.0K  3.2G   1% /run/user/1000
tmpfs                              3.2G  4.0K  3.2G   1% /run/user/0

root@root:/dev/ubuntu-vg# lsblk
NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
loop0                       7:0    0  63.4M  1 loop /snap/core20/1974
loop1                       7:1    0 111.9M  1 loop /snap/lxd/24322
loop2                       7:2    0  53.3M  1 loop /snap/snapd/19457
sda                         8:0    0 931.5G  0 disk 
├─sda1                      8:1    0     1G  0 part /boot/efi
├─sda2                      8:2    0     2G  0 part /boot
└─sda3                      8:3    0 928.5G  0 part 
  └─ubuntu--vg-ubuntu--lv 253:0    0   100G  0 lvm  /
sdb                         8:16   0 465.8G  0 disk 
├─sdb1                      8:17   0   512M  0 part 
└─sdb2                      8:18   0 465.3G  0 part 
sdc                         8:32   0  14.6T  0 disk 
sr0                        11:0    1  1024M  0 rom  

发现根目录所用的磁盘sda3并没有全部使用。
进一步查看

root@root:/dev/ubuntu-vg# lvdisplay
  --- Logical volume ---
  LV Path                /dev/ubuntu-vg/ubuntu-lv
  LV Name                ubuntu-lv
  VG Name                ubuntu-vg
  LV UUID                RToKk1-GbJM-MDa7-grPB-4G7w-P0rf-CebMGx
  LV Write Access        read/write
  LV Creation host, time ubuntu-server, 2024-02-01 11:49:44 +0000
  LV Status              available
  # open                 1
  LV Size                100.00 GiB
  Current LE             25600
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

root@root:/dev/ubuntu-vg# 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               <928.46 GiB
  PE Size               4.00 MiB
  Total PE              237685
  Alloc PE / Size       25600 / 100.00 GiB
  Free  PE / Size       212085 / <828.46 GiB
  VG UUID               uk62ul-FktK-OGXv-Q205-0zw1-TSoa-JrvWYc

root@root:/dev/ubuntu-vg# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               ubuntu-vg
  PV Size               928.46 GiB / not usable 4.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              237685
  Free PE               212085
  Allocated PE          25600
  PV UUID               FbHwHf-f252-LmPi-70Gz-o8cq-YSdF-Pl8ZAP

扩展操作如下

1. 扩展逻辑卷：

sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv

此命令将逻辑卷扩展到卷组中的所有可用空间。

2. 调整文件系统大小：

sudo resize2fs /dev/ubuntu-vg/ubuntu-lv

此命令将文件系统调整到逻辑卷的新大小。

3.再次查看文件系统大小：

root@root:/dev/ubuntu-vg# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              3.2G  1.7M  3.2G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  914G   93G  783G  11% /
tmpfs                               16G     0   16G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sda2                          2.0G  130M  1.7G   8% /boot
/dev/sda1                          1.1G  6.1M  1.1G   1% /boot/efi
tmpfs                              3.2G  4.0K  3.2G   1% /run/user/1000
tmpfs                              3.2G  4.0K  3.2G   1% /run/user/0

调整完毕