一.磁盘扩容
随后，开启此虚拟机
二.创建新的磁盘分区
fdisk -l --查看磁盘情况
如上所示，磁盘空间扩展为42.9GB
fdisk /dev/sdb --为/dev/sdb设备分区
我这里将原来的第四个分区删除，并重新创建以达到扩容目的：
[[email protected] ~]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
You must delete some partition and add an extended partition first
Command (m for help): ^C
[[email protected] ~]# fdisk /dev/sda
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): d
Partition number (1-4): 4
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Selected partition 4
First cylinder (2611-5221, default 2611):
Using default value 2611
Last cylinder, +cylinders or +size{K,M,G} (2611-5221, default 5221):
Using default value 5221
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
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)
Syncing disks.mkdir /disk4 --创建挂载目录
由于我这里是扩容，先前 /disk4 目录已经创建好了
reboot --重启
mkfs.ext4 /dev/sda4 --格式化
三.挂载并设置自动挂载
mount /dev/sda4 /disk4/ --挂载
vi /etc/fstab --设置开机自动挂载
扩容成功！