PVE VM Disk Expand
PVE 虚拟主机磁盘扩容
由于已创建的虚拟机开始磁盘空间设置得太小了，后续服务增加后导致磁盘空间不足，为了保证服务的正常使用，对虚拟机进行磁盘扩容
1）PVE 磁盘映像扩容：首先需要在 PVE 管理后台对目标虚拟机的磁盘映像进行扩容，操作步骤如下：
- 选中目标虚拟机 -> 硬件 -> 磁盘
- Disk Action -> Resize
- 在”调整磁盘大小”窗体中输入需要增量的大小
点击“调整磁盘大小”确认后，硬盘(scsi0) 的具体参数就会变成 size=80G，此时只是增加了新磁盘，未挂载的话还是无法使用的；
2）通过命令行工具进行服务器进行操作，首先查看磁盘是否有增加
| $ sudo fdisk -l
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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 label type: dos
Disk identifier: 0x000abd26
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 104857599 51379200 8e Linux LVM
Disk /dev/mapper/centos_pbe-root: 48.3 GB, 48318382080 bytes, 94371840 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/centos_pbe-swap: 4286 MB, 4286578688 bytes, 8372224 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
$ sudo df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 4.9G 0 4.9G 0% /dev
tmpfs tmpfs 4.9G 0 4.9G 0% /dev/shm
tmpfs tmpfs 4.9G 9.8M 4.9G 1% /run
tmpfs tmpfs 4.9G 0 4.9G 0% /sys/fs/cgroup
/dev/mapper/centos_pbe-root xfs 45G 14G 32G 30% /
/dev/sda1 xfs 1014M 147M 868M 15% /boot
tmpfs tmpfs 843M 0 843M 0% /run/user/1000
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通过命令输出的信息可以看到磁盘的容量已发生变化，但分区的信息还是未改变
3）扩容分区：查询磁盘分区信息（如多磁盘需要根据上述输出的实际磁盘路径修改）
| $ sudo parted /dev/sda
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 85.9GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 1075MB 1074MB primary xfs boot
2 1075MB 53.7GB 52.6GB primary lvm
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4）执行 resizepart 命令，将磁盘容量进行划分，此处的 2 为上面打印的磁盘分区(需要扩容的分区编号)
| (parted) resizepart 2 100%
(parted) quit
Information: You may need to update /etc/fstab.
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5）执行 pvresize 命令更新磁盘信息，再查看扩容结果，可以看到 /dev/sda2 已变更，但磁盘目录未有变化
| $ sudo pvresize /dev/sda2
Physical volume "/dev/sda2" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized
$ sudo fdisk -l
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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 label type: dos
Disk identifier: 0x000abd26
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 167772159 82836480 8e Linux LVM
Disk /dev/mapper/centos_pbe-root: 48.3 GB, 48318382080 bytes, 94371840 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/centos_pbe-swap: 4286 MB, 4286578688 bytes, 8372224 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
$ sudo df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 4.9G 0 4.9G 0% /dev
tmpfs tmpfs 4.9G 0 4.9G 0% /dev/shm
tmpfs tmpfs 4.9G 9.8M 4.9G 1% /run
tmpfs tmpfs 4.9G 0 4.9G 0% /sys/fs/cgroup
/dev/mapper/centos_pbe-root xfs 45G 14G 32G 30% /
/dev/sda1 xfs 1014M 147M 868M 15% /boot
tmpfs tmpfs 843M 0 843M 0% /run/user/1000
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6）之后执行 vgdisplay 查看逻辑卷信息
| $ sudo vgdisplay
--- Volume group ---
VG Name centos_pbe
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <79.00 GiB
PE Size 4.00 MiB
Total PE 20223
Alloc PE / Size 12542 / 48.99 GiB
Free PE / Size 7681 / 30.00 GiB
VG UUID 5CEHUU-1adt-fLKt-AaL9-dg6o-JUfO-3elLgR
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7）执行 lvextend 划分全部空闲分区给指定的分区，再查看目录大小情况
| $ lvextend -rl +100%FREE /dev/mapper/centos_pbe-root
Size of logical volume centos_pbe/root unchanged from 75.00 GiB (19201 extents).
Logical volume centos_pbe/root successfully resized.
meta-data=/dev/mapper/centos_pbe-root isize=512 agcount=4, agsize=2949120 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=11796480, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=5760, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 11796480 to 19661824
$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 4.9G 0 4.9G 0% /dev
tmpfs 4.9G 0 4.9G 0% /dev/shm
tmpfs 4.9G 9.8M 4.9G 1% /run
tmpfs 4.9G 0 4.9G 0% /sys/fs/cgroup
/dev/mapper/centos_pbe-root 75G 14G 62G 18% /
/dev/sda1 1014M 147M 868M 15% /boot
tmpfs 995M 0 995M 0% /run/user/1000
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