处理ubuntu20.04 server 安装后剩余空间没有完全分配问题

安装ubuntu20.04 server后使用df查看挂载的可用空间只有100G而我安装系统的硬盘为500G。因此尝试从网上找寻相关的解决办法。亲测可行的办法如下：
1，执行df -h查看当前存储设备挂载情况

huangjunjie@ubuntu:~$ df -h
Filesystem                                                            Size  Used Avail Use% Mounted on
tmpfs                                                                 784M   12M  772M   2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv                                      98G   19G   75G  21% /
tmpfs                                                                 3.9G   60K  3.9G   1% /dev/shm
tmpfs                                                                 5.0M     0  5.0M   0% /run/lock
/dev/sda2                                                             2.0G  131M  1.7G   8% /boot
/dev/sda1                                                             1.1G  6.1M  1.1G   1% /boot/efi
tmpfs                                                                 784M  4.0K  784M   1% /run/user/1000

查询到/dev/mapper/ubuntu--vg-ubuntu--lv 只有100G左右。因此需要将剩余空间分配给它。

2.执行sudo sudo vgdisplay查询可分配空间

huangjunjie@ubuntu:~$ sudo vgdisplay
[sudo] password for huangjunjie: 
  --- 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               <462.71 GiB
  PE Size               4.00 MiB
  Total PE              118453
  Alloc PE / Size       25600 / 100.00 GiB
  Free  PE / Size       92853 / <362.71 GiB
  VG UUID               DtyFC3-ko26-ynbz-Q4iU-xEOg-pKeK-UfqdLc

查询到可分配的分区Free PE / Size还有300多G
3.执行sudo lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv将剩余空间分配给/dev/mapper/ubuntu--vg-ubuntu--lv

  huangjunjie@ubuntu:~$ sudo lvextend -l +100%FREE  /dev/mapper/ubuntu--vg-ubuntu--lv
  Size of logical volume ubuntu-vg/ubuntu-lv changed from 100.00 GiB (25600 extents) to <462.71 GiB (118453 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

4.执行sudo resize2fs /dev/mapper/ubuntu–vg-ubuntu–lv重新计算大小

huangjunjie@ubuntu:~$ sudo resize2fs /dev/mapper/ubuntu–vg-ubuntu–lv
resize2fs 1.46.5 (30-Dec-2021)
open: No such file or directory while opening /dev/mapper/ubuntu–vg-ubuntu–lv
huangjunjie@ubuntu:~$ sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required
old_desc_blocks = 13, new_desc_blocks = 58

5.执行df -h再次看到挂载分区大小

huangjunjie@ubuntu:~$ df -h
Filesystem                                                            Size  Used Avail Use% Mounted on
tmpfs                                                                 784M   12M  772M   2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv                                     455G   19G  417G   5% /
tmpfs                                                                 3.9G   60K  3.9G   1% /dev/shm
tmpfs                                                                 5.0M     0  5.0M   0% /run/lock
/dev/sda2                                                             2.0G  131M  1.7G   8% /boot
/dev/sda1                                                             1.1G  6.1M  1.1G   1% /boot/efi
tmpfs  

此时/已经把剩余的空间全部分配了
特别鸣谢：
https://blog.csdn.net/weixin_43302340/article/details/120341241