因为根目录会包含很多系统应用运行的配置等，肯定不能直接卸载，所以要采用一种既不破坏数据，又能扩容的方法：
1.关机
2.设置->扩展磁盘容量
3.开机
[[email protected] ~]#df -hT-T 文件系统Filesystem Type Size Used Avail Use% Mounted on/dev/sda2ext418G15G 2.6G85%/tmpfs tmpfs 491M 148K 491M 1% /dev/shm
/dev/sda1 ext4 291M 34M 242M 13% /boot
[[email protected] ~]#fdisk -l
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda239 2358 1863168083Linux非LVM
[[email protected] ~]#fdisk /dev/sda
d删除分区
2删除/dev/sda2
n新增
p主分区
2新增/dev/sda2
回车默认
回车默认
w保存
[[email protected] ~]#reboot
因为是ext4格式，用resize2fs
[root@localhost ~]#resize2fs /dev/sda2resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/sda2 is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/sda2 to 10407364 (4k) blocks.
The filesystem on /dev/sda2 is now 10407364 blocks long.
[[email protected] ~]#df -hTFilesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext4 40G 15G 24G38%/
tmpfs tmpfs 491M 80K 491M 1% /dev/shm
/dev/sda1 ext4 291M 34M 242M 13% /boot
.host:/ vmhgfs 921G 171G 751G 19% /mnt/hgfs
[r[email protected] ~]#lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 1024M 0 rom
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 300M 0 part /boot
└─sda2 8:2 039.7G0 part /
由于sda2挂载在根目录下，sda2是最后一个分区，所以新增的空间跟sda2是连续的，在最后选择start和end的时候，就能连接上，这也是成功的一个条件