在proxmox中调整磁盘容量
pve直接提供了网页接口，因此在网页中调整vm硬盘即可。注意文件系统应为LVM。
在虚拟机中进行容量叠加
首先reboot，然后看到出现新的未分配空间。未调整前大小为29GB：
Disk /dev/sda: 29 GiB, 31138512896 bytes, 60817408 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: dos
Disk identifier: 0xedaaada3
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 499711 497664 243M 83 Linux
/dev/sda2 501758 56621055 56119298 26.8G 5 Extended
/dev/sda3 56621056 60817407 4196352 2G 83 Linux
/dev/sda5 501760 56621055 56119296 26.8G 8e Linux LVM
Partition table entries are not in disk order.
Disk /dev/mapper/debian--vg-root: 26.3 GiB, 28198305792 bytes, 55074816 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/mapper/debian--vg-swap_1: 508 MiB, 532676608 bytes, 1040384 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
这里增加了2GB后的效果：
root@debian:~# fdisk -l
Disk /dev/sda: 31 GiB, 33285996544 bytes, 65011712 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: dos
Disk identifier: 0xedaaada3
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 499711 497664 243M 83 Linux
/dev/sda2 501758 56621055 56119298 26.8G 5 Extended
/dev/sda3 56621056 60817407 4196352 2G 8e Linux LVM
/dev/sda5 501760 56621055 56119296 26.8G 8e Linux LVM
Partition table entries are not in disk order.
Disk /dev/mapper/debian--vg-root: 28.3 GiB, 30345789440 bytes, 59269120 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/mapper/debian--vg-swap_1: 508 MiB, 532676608 bytes, 1040384 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
接着使用cfdisk进行分区操作，界面比fdisk简单，直观：
cfdisk.PNG
可以看到绿色区域free space就是新添加的容量。这里选中free space：
cfdsik2.PNG
选择New回车，再选择空间（或者直接回车）后就已建立好新分区，再选择Type，在分区类型处选择Linux LVM:
cfdsik3.PNG
选择好分区类型后，在上一层选择Write将修改写入即可。
如此一来分区就建好了，接下来将其与主分区合并：
- 将物理硬盘分区初始化为物理卷，以便LVM使用
root@debian:~# pvcreate -ff /dev/sda4 Physical volume "/dev/sda4" successfully created. - 创建LVM卷组，此处 amfslvm3 为卷组名，可随意命名
root@debian:~# vgcreate amfslvm3 /dev/sda4 Volume group "amfslvm3" successfully created - 列出当前所有卷组，可以看到debian-vg就是主卷组
root@debian:~# vgscan Reading all physical volumes. This may take a while... Found volume group "amfslvm3" using metadata type lvm2 Found volume group "debian-vg" using metadata type lvm2 - 将新创建卷组与主卷组合并
root@debian:~# vgmerge debian-vg amfslvm3 Volume group "amfslvm3" successfully merged into "debian-vg" - 使用空闲容量扩充主卷组，此处/dev/mapper/debian—vg-root 需要自己使用 df -h查看
root@debian:~# lvresize --extents +100%FREE --resizefs /dev/mapper/debian--vg-root Size of logical volume debian-vg/root changed from 28.26 GiB (7235 extents) to <30.26 GiB (7746 extents). Logical volume debian-vg/root successfully resized. resize2fs 1.44.5 (15-Dec-2018) Filesystem at /dev/mapper/debian--vg-root is mounted on /; on-line resizing required old_desc_blocks = 4, new_desc_blocks = 4 The filesystem on /dev/mapper/debian--vg-root is now 7931904 (4k) blocks long. - 验证是否生效
root@debian:~# df -h Filesystem Size Used Avail Use% Mounted on udev 226M 0 226M 0% /dev tmpfs 49M 2.3M 47M 5% /run /dev/mapper/debian--vg-root 30G 1021M 28G 4% / tmpfs 242M 0 242M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 242M 0 242M 0% /sys/fs/cgroup /dev/sda1 236M 49M 176M 22% /boot tmpfs 49M 0 49M 0% /run/user/0