Pve 中的 Ubuntu (LVM) 动态扩容 #261
Description
大体上就两个步骤：
- 在 PVE 扩容 Hard Disk；
- 在 Ubuntu 中使用该部分空间；
pve 扩容很简单：
主要讲一下 ubuntu 里的操作：
首先确保系统采用的是 LVM 方式进行管理的:
root@pve-ubuntu:/home/ziyuan# sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 55.6M 1 loop /snap/core18/2721
loop1 7:1 0 55.7M 1 loop /snap/core18/2745
loop2 7:2 0 63.3M 1 loop /snap/core20/1852
loop3 7:3 0 63.3M 1 loop /snap/core20/1879
loop4 7:4 0 91.8M 1 loop /snap/lxd/23991
loop5 7:5 0 91.9M 1 loop /snap/lxd/24061
loop6 7:6 0 53.2M 1 loop /snap/snapd/18933
loop7 7:7 0 53.2M 1 loop /snap/snapd/19122
sda 8:0 0 64G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1G 0 part /boot
├─sda3 8:3 0 31G 0 part
│ └─ubuntu--vg-ubuntu--lv 253:0 0 63G 0 lvm /
sr0 11:0 1 1024M 0 rom LVM 非常灵活，所以选择将剩余空间创建为 sda4 然后添加到 ubuntu-lv 中：
root@pve-ubuntu:/home/ziyuan# fdisk /dev/sda
Welcome to fdisk (util-linux 2.34).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
GPT PMBR size mismatch (67108863 != 134217727) will be corrected by write.
The backup GPT table is not on the end of the device. This problem will be corrected by write.
Command (m for help): p
Disk /dev/sda: 64 GiB, 68719476736 bytes, 134217728 sectors
Disk model: QEMU HARDDISK
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: 8AE1E7AF-8CC8-4409-8215-7BED79299D55
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 2101247 2097152 1G Linux filesystem
/dev/sda3 2101248 67106815 65005568 31G Linux filesystem
Command (m for help): n
Partition number (4-128, default 4):
First sector (67106816-134217694, default 67106816):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (67106816-134217694, default 134217694):
Created a new partition 4 of type 'Linux filesystem' and of size 32 GiB.
Command (m for help): p
Disk /dev/sda: 64 GiB, 68719476736 bytes, 134217728 sectors
Disk model: QEMU HARDDISK
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: 8AE1E7AF-8CC8-4409-8215-7BED79299D55
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 2101247 2097152 1G Linux filesystem
/dev/sda3 2101248 67106815 65005568 31G Linux filesystem
/dev/sda4 67106816 134217694 67110879 32G Linux filesystem
Command (m for help): w
The partition table has been altered.
Syncing disks.再将 sda4 添加到 ubuntu-lv 中:
root@pve-ubuntu:/home/ziyuan# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 55.6M 1 loop /snap/core18/2721
loop1 7:1 0 55.7M 1 loop /snap/core18/2745
loop2 7:2 0 63.3M 1 loop /snap/core20/1852
loop3 7:3 0 63.3M 1 loop /snap/core20/1879
loop4 7:4 0 91.8M 1 loop /snap/lxd/23991
loop5 7:5 0 91.9M 1 loop /snap/lxd/24061
loop6 7:6 0 53.2M 1 loop /snap/snapd/18933
loop7 7:7 0 53.2M 1 loop /snap/snapd/19122
sda 8:0 0 64G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1G 0 part /boot
├─sda3 8:3 0 31G 0 part
│ └─ubuntu--vg-ubuntu--lv 253:0 0 30G 0 lvm /
└─sda4 8:4 0 32G 0 part
sr0 11:0 1 1024M 0 rom
root@pve-ubuntu:/home/ziyuan# pvcreate /dev/sda4
Physical volume "/dev/sda4" successfully created.
root@pve-ubuntu:/home/ziyuan# pvdisplay
--- Physical volume ---
PV Name /dev/sda3
VG Name ubuntu-vg
PV Size <31.00 GiB / not usable 0
Allocatable yes
PE Size 4.00 MiB
Total PE 7935
Free PE 255
Allocated PE 7680
PV UUID BSt56B-JvpL-EZ8X-bUi8-1cgR-SfGP-xrr2IJ
"/dev/sda4" is a new physical volume of "32.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sda4
VG Name
PV Size 32.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID rHquaT-CU7z-33l0-R1RC-N2h4-qKMM-0tiV0P
root@pve-ubuntu:/home/ziyuan# 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 <31.00 GiB
PE Size 4.00 MiB
Total PE 7935
Alloc PE / Size 7680 / 30.00 GiB
Free PE / Size 255 / 1020.00 MiB
VG UUID nR8EFU-9EGZ-d0mv-vSzj-cEZc-EOj5-irugrI
root@pve-ubuntu:/home/ziyuan# vgextend ubuntu-vg /dev/sda4
Volume group "ubuntu-vg" successfully extended
root@pve-ubuntu:/home/ziyuan# vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 2
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 2
Act PV 2
VG Size 62.99 GiB
PE Size 4.00 MiB
Total PE 16126
Alloc PE / Size 7680 / 30.00 GiB
Free PE / Size 8446 / 32.99 GiB
VG UUID nR8EFU-9EGZ-d0mv-vSzj-cEZc-EOj5-irugrI
root@pve-ubuntu:/home/ziyuan# vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 2
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 2
Act PV 2
VG Size 62.99 GiB
PE Size 4.00 MiB
Total PE 16126
Alloc PE / Size 7680 / 30.00 GiB
Free PE / Size 8446 / 32.99 GiB
VG UUID nR8EFU-9EGZ-d0mv-vSzj-cEZc-EOj5-irugrI
root@pve-ubuntu:/home/ziyuan# lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 30.00 GiB (7680 extents) to 62.99 GiB (16126 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
root@pve-ubuntu:/home/ziyuan# resize2fs /dev/ubuntu-vg/ubuntu-lv
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
old_desc_blocks = 4, new_desc_blocks = 8
The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 16513024 (4k) blocks long.
扩容成功，查看结果:
root@pve-ubuntu:/home/ziyuan# df -hl
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 382M 2.1M 380M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 62G 26G 33G 45% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda2 974M 304M 603M 34% /boot