概述
前段时间基于Ubuntu22.04 搭建了Jenkins, VM 当时给的 OS disk size是100G, 今天查看环境，无意间发现/空间使用率接近50%。
本文简易概述LV扩容。
现象
root@jenkins:~# df -Ph
Filesystem Size Used Avail Use% Mounted on
tmpfs 796M 1.2M 794M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 48G 22G 25G 47% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 2.0G 126M 1.7G 7% /boot
tmpfs 796M 4.0K 796M 1% /run/user/0
root@jenkins:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
fd0 2:0 1 4K 0 disk
loop0 7:0 0 63.3M 1 loop /snap/core20/1822
loop1 7:1 0 63.3M 1 loop /snap/core20/1828
loop2 7:2 0 79.9M 1 loop /snap/lxd/22923
loop3 7:3 0 111.9M 1 loop /snap/lxd/24322
loop4 7:4 0 49.8M 1 loop /snap/snapd/17950
loop5 7:5 0 49.8M 1 loop /snap/snapd/18357
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 2G 0 part /boot
└─sda3 8:3 0 98G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 49G 0 lvm /
sr0 11:0 1 1024M 0 rom
可用空间98G，实际只分配了49G，余下空间想利用起来。
实践
-
查看可用空间
root@jenkins:~# lvdisplay
--- Logical volume ---
LV Path /dev/ubuntu-vg/ubuntu-lv
LV Name ubuntu-lv
VG Name ubuntu-vg
LV UUID c5tkxV-ZwMC-rVs5-ucVU-gYeQ-B36P-Fgw3JT
LV Write Access read/write
LV Creation host, time ubuntu-server, 2023-01-29 15:41:37 +0800
LV Status available
# open 1
LV Size <49.00 GiB
Current LE 12543
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
root@jenkins:~#
root@jenkins:~# fdisk -l /dev/sda
Disk /dev/sda: 100 GiB, 107374182400 bytes, 209715200 sectors
Disk model: Virtual disk
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: EEA2172F-74FA-41F6-AB3C-D4E8F8F5A991
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 209713151 205514752 98G Linux filesystem
root@jenkins:~#
从上图可以看出磁盘大小(98)大于系统逻辑分区大小(49G)，知道了现在磁盘完全可以提升利用率，就可以直接进行扩容，不需要额外增加硬盘
-
执行命令扩容
lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
root@jenkins:~# lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from <49.00 GiB (12543 extents) to <98.00 GiB (25087 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
root@jenkins:~#
注意后面的逻辑分区名字使用lvdisplay命令获取到的
3、执行 命令 resize2fs /dev/ubuntu-vg/ubuntu-lv 刷新逻辑卷
4、执行命令df -h查看效果
root@jenkins:~# df -Ph
Filesystem Size Used Avail Use% Mounted on
tmpfs 796M 1.2M 794M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 97G 22G 71G 24% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 2.0G 126M 1.7G 7% /boot
tmpfs 796M 4.0K 796M 1% /run/user/0
root@jenkins:~#
root@jenkins:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
fd0 2:0 1 4K 0 disk
loop0 7:0 0 63.3M 1 loop /snap/core20/1822
loop1 7:1 0 63.3M 1 loop /snap/core20/1828
loop2 7:2 0 79.9M 1 loop /snap/lxd/22923
loop3 7:3 0 111.9M 1 loop /snap/lxd/24322
loop4 7:4 0 49.8M 1 loop /snap/snapd/17950
loop5 7:5 0 49.8M 1 loop /snap/snapd/18357
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 2G 0 part /boot
└─sda3 8:3 0 98G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 98G 0 lvm /
sr0 11:0 1 1024M 0 rom
root@jenkins:~#
root@jenkins:~#
