1 查看根分区空间：
root@ggc:/home/ggc# df -h Filesystem Size Used Avail Use% Mounted on tmpfs 1.5G 1.3M 1.5G 1% /run /dev/mapper/ubuntu--vg-ubuntu--lv 98G 14G 80G 15% / tmpfs 7.5G 4.0K 7.5G 1% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock /dev/sda2 2.0G 127M 1.7G 7% /boot tmpfs 1.5G 4.0K 1.5G 1% /run/user/1000
2 查看磁盘分区列表：
root@ggc:/home/ggc# fdisk -l Disk /dev/loop0: 61.96 MiB, 64970752 bytes, 126896 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/loop1: 79.95 MiB, 83832832 bytes, 163736 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/loop2: 46.96 MiB, 49242112 bytes, 96176 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/loop3: 49.64 MiB, 52051968 bytes, 101664 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/loop4: 63.24 MiB, 66314240 bytes, 129520 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/loop5: 102.98 MiB, 107986944 bytes, 210912 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/sda: 447.13 GiB, 480103981056 bytes, 937703088 sectors Disk model: SanDisk SSD PLUS Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: F8CC8F99-71A8-449B-A116-9E3DB789FB3F Device Start End Sectors Size Type /dev/sda1 2048 4095 2048 1M BIOS boot /dev/sda2 4096 4198399 4194304 2G Linux filesystem /dev/sda3 4198400 937699327 933500928 445.1G Linux filesystem Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 100 GiB, 107374182400 bytes, 209715200 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
3 增加根分区：
（这里分配全部剩余空间）
root@ggc:/home/ggc# lvresize -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 445.12 GiB (113952 extents). Logical volume ubuntu-vg/ubuntu-lv successfully resized.
*一些其它常用修改大小命令
lvextend -L 20G /dev/mapper/ubuntu–vg-ubuntu–lv //增大或减小至20G lvextend -L +20G /dev/mapper/ubuntu–vg-ubuntu–lv //增加20G lvreduce -L -20G /dev/mapper/ubuntu–vg-ubuntu–lv //减小20G lvresize -l +100%FREE /dev/mapper/ubuntu–vg-ubuntu–lv //按百分比扩容
4 保存分区信息：
root@ggc:/home/ggc# 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 = 56 The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 116686848 (4k) blocks long.
5 查看lvm卷组的信息
root@ggc:/home/ggc# 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 445.12 GiB PE Size 4.00 MiB Total PE 113952 Alloc PE / Size 113952 / 445.12 GiB Free PE / Size 0 / 0 VG UUID 4bkNc3-OcUT-NO9B-rNXa-aKfG-tJvO-aITcaT
6 再次查看根分区：
root@ggc:/home/ggc# df -h Filesystem Size Used Avail Use% Mounted on tmpfs 1.5G 1.3M 1.5G 1% /run /dev/mapper/ubuntu--vg-ubuntu--lv 438G 14G 406G 4% / tmpfs 7.5G 4.0K 7.5G 1% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock /dev/sda2 2.0G 127M 1.7G 7% /boot tmpfs 1.5G 4.0K 1.5G 1% /run/user/1000