参考：
https://blog.csdn.net/u014094046/article/details/95951833
[root@hadoop002 ~]# 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: 0x0000e740
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 821247 409600 83 Linux
/dev/sda2 821248 7112703 3145728 82 Linux swap / Solaris
/dev/sda3 7112704 41924607 17405952 83 Linux
[root@hadoop002 ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
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: 0x0000e740
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 821247 409600 83 Linux
/dev/sda2 821248 7112703 3145728 82 Linux swap / Solaris
/dev/sda3 7112704 41924607 17405952 83 Linux
Command (m for help): n
Partition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p
Selected partition 4
First sector (41924608-209715199, default 41924608): ^Z
[1]+ Stopped fdisk /dev/sda
[root@hadoop002 ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
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: 0x0000e740
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 821247 409600 83 Linux
/dev/sda2 821248 7112703 3145728 82 Linux swap / Solaris
/dev/sda3 7112704 41924607 17405952 83 Linux
Command (m for help): d
Partition number (1-3, default 3): 3
Partition 3 is deleted
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3): 3
First sector (7112704-209715199, default 7112704):
Using default value 7112704
Last sector, +sectors or +size{K,M,G} (7112704-209715199, default 209715199):
Using default value 209715199
Partition 3 of type Linux and of size 96.6 GiB is set
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.
[root@hadoop002 ~]# reboot
[root@hadoop002 ~]# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda3 ext4 17001256 16101364 13212 100% /
devtmpfs devtmpfs 915976 0 915976 0% /dev
tmpfs tmpfs 931624 0 931624 0% /dev/shm
tmpfs tmpfs 931624 10336 921288 2% /run
tmpfs tmpfs 931624 0 931624 0% /sys/fs/cgroup
/dev/sda1 ext4 388462 146128 217758 41% /boot
tmpfs tmpfs 186328 0 186328 0% /run/user/0
tmpfs tmpfs 186328 12 186316 1% /run/user/42
[root@hadoop002 ~]# resize2fs /dev/sda3
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/sda3 is mounted on /; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 13
The filesystem on /dev/sda3 is now 25325312 blocks long.
[root@hadoop002 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 95G 16G 76G 17% /
devtmpfs 895M 0 895M 0% /dev
tmpfs 910M 0 910M 0% /dev/shm
tmpfs 910M 11M 900M 2% /run
tmpfs 910M 0 910M 0% /sys/fs/cgroup
/dev/sda1 380M 143M 213M 41% /boot
tmpfs 182M 0 182M 0% /run/user/0
tmpfs 182M 8.0K 182M 1% /run/user/42
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