先将虚拟机关机，按上图调整虚拟磁盘大小。
1.开启并进入虚拟机，打开终端，输入命令 df -Th 查看格式，图示中 /dev/mapper/centos-root 类型为xfs。
[mango@localhost ~]$ df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs tmpfs 1.9G 16K 1.9G 1% /dev/shm
tmpfs tmpfs 1.9G 13M 1.9G 1% /run
tmpfs tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root xfs 97G 18G 80G 18% /
/dev/sda1 xfs 1014M 185M 830M 19% /boot
tmpfs tmpfs 378M 0 378M 0% /run/user/1004
tmpfs tmpfs 378M 24K 378M 1% /run/user/1000
[mango@localhost ~]$
2.执行 fdisk -l 命令查看磁盘容量，Disk /dev/sda: 107.4 GB
[root@localhost mango]# fdisk -l
Disk /dev/sda: 107.4 GB, 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
Disk label type: dos
Disk identifier: 0x000a56ed
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
Disk /dev/mapper/centos-root: 104.1 GB, 104144568320 bytes, 203407360 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-swap: 2147 MB, 2147483648 bytes, 4194304 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. 新建分区
执行命令:fdisk /dev/sda
然后输入m->n->p->回车->回车->回车->w
WARNING: Re-reading the partition table failed with error 16
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)然后重起机器，执行命令:reboot ，重启之后执行命令:fdisk -l 查看分区，新的分区号是3
[root@localhost mango]# fdisk -l
Disk /dev/sda: 107.4 GB, 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
Disk label type: dos
Disk identifier: 0x000a56ed
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
/dev/sda3 41943040 209715199 83886080 83 Linux
Disk /dev/mapper/centos-root: 104.1 GB, 104144568320 bytes, 203407360 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-swap: 2147 MB, 2147483648 bytes, 4194304 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
4.对/dev/sda3进行格式化
执行命令:mkfs.xfs /dev/sda3
meta-data=/dev/sda3 isize=512 agcount=4, agsize=67108864 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=268435455, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=131071, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=05.创建pv
执行命令:pvcreate /dev/sda3，然后输入y。
WARNING: xfs signature detected on /dev/sda3 at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/sda3.
Physical volume "/dev/sda3" successfully created.6.处理逻辑卷
执行命令: vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 3 0 wz--n- <40.00g 4.00m执行命令:vgextend centos /dev/sda3
Volume group "centos" successfully extended执行命令: vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- <100.00g 60.00g可以看到由原来的40G变成100G。其中60G是空闲的.
7.扩容
执行命令 df -h 查看要扩容的文件系统的位置 ，这是是/dev/mapper/centos-root
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 8.9M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 100G 40G 60G 60% /
/dev/sda1 1014M 188M 827M 19% /boot
tmpfs 1.6G 0 1.6G 0% /run/user/0执行命令 lvextend -l +100%free /dev/mapper/centos-root
Size of logical volume centos/root changed from <40.00 GiB (244470 extents) to 99 G iB(504414 extents).
Logical volume centos/root successfully resized.执行命令 xfs_growfs /dev/mapper/centos-root ,扩容，调整分区。
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=63249920 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=252999680, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=123535, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 252888680 to 521435136最后执行命令 df -h 查看结果，/dev/mapper/centos-root 97G 18G 80G 18% / 扩容成功。
[root@localhost mango]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 16K 1.9G 1% /dev/shm
tmpfs 1.9G 14M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 97G 18G 80G 18% /
/dev/sda1 1014M 185M 830M 19% /boot
tmpfs 378M 0 378M 0% /run/user/1004
overlay 97G 18G 80G 18% /var/lib/docker/overlay2/991379841d72fc0590635ec3200708f4ded9dc835e03f802f41b43e8f5c646c5/merged
overlay 97G 18G 80G 18% /var/lib/docker/overlay2/2111d79f02eff348c8d279503dd1792f8087f557b5a3cd46cb3b34cfe35ee77c/merged
overlay 97G 18G 80G 18% /var/lib/docker/overlay2/471057e0f8924906878163b59f57e20b01a2d8b9310f8b0e6fe125703305cafe/merged
overlay 97G 18G 80G 18% /var/lib/docker/overlay2/1814426175f7cebe390a28befb3b8643689e32f589081f3c686382ad3a3e1fa0/merged
overlay 97G 18G 80G 18% /var/lib/docker/overlay2/355a1a6ba62146001c72c9f26714763fb99613ddd0d45374047fc43c4caec37a/merged
overlay 97G 18G 80G 18% /var/lib/docker/overlay2/9efb26b7e01cd506b16898c97bee46b5396ce914493ee38bfa946ec83bbab756/merged
tmpfs 378M 24K 378M 1% /run/user/1000
tmpfs 378M 0 378M 0% /run/user/0
