亚马逊EC2根硬盘空间扩容

买的系统盘为32G，结果发现只使用了8G，剩下的都未分配

lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
xvda    :       32G   disk
└─xvda1 :        8G   part /

fdisk -u /dev/xvda
Command (m for help): p

Disk /dev/xvda: 34.4 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk label type: dos
Disk identifier: 0x000998ac

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *                      Linux

Command (m for help): d
Selected partition
Partition  is deleted

Command (m for help): n
Partition type:
   p   primary ( primary,  extended,  free)
   e   extended
Select (default p): p
Partition number (-, default ):
First sector (-, default ):
Using default value
Last sector, +sectors or +size{K,M,G} (-, default ):
Using default value
Partition  of type Linux and of size  GiB is set

Command (m for help): p

Disk /dev/xvda: 34.4 GB,  bytes,  sectors
Units = sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disk label type: dos
Disk identifier: 0x000998ac

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1                         Linux
Command (m for help): w
The partition table has been altered!

reboot

lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
xvda    :       32G   disk
└─xvda1 :       32G   part /

df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      .0G  .3G  .8G  % /

ext格式调整大小
resize2fs /dev/xvda1
xfs格式调整大小
xfs_growfs /dev/xvda1

df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1       32G  .3G   31G   % /

到此扩容完毕