In CentOS, the home space is allocated to the root user.

Centos system extended VolGroup-lv_root partition

The following operations are completed through actual operations.

The following example shows how to allocate 5g of the home space to the root space.

[Root @ localhost ~] # Df-h

File system capacity in use available % mount point

/Dev/mapper/VolGroup-lv_root

75 GB 50G 22G 70%/

Tmpfs 3.9G 88 K 3.9G 1%/dev/shm

/Dev/sda1 485 M 30 M 430 M 7%/boot

/Dev/mapper/VolGroup-lv_home

20G 174 M 19G 1%/home

[Root @ localhost ~] # Umount/home

[Root @ localhost ~] # E2fsck-f/dev/mapper/VolGroup-lv_home

E2fsck 1.41.12 (17-May-2010)

Step 1: Check inode, block, and size

Step 2: Check the directory structure

Step 2: check Directory connectivity

Pass 4: Checking reference counts

Step 1: Check the cluster summary

/Dev/mapper/VolGroup-lv_home: 158/1310720 files (0.0% non-contiguous), 126581/5242880 blocks

[Root @ localhost ~] # Resize2fs-p/dev/mapper/VolGroup-lv_home 15G

Resize2fs 1.41.12 (17-May-2010)

Resizing the filesystem on/dev/mapper/VolGroup-lv_home to 3932160 (4 k) blocks.

Begin pass 3 (max = 160)

Scanning inode table xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

The filesystem on/dev/mapper/VolGroup-lv_home is now 3932160 blocks long.

 

[Root @ localhost ~] # Mount/home

[Root @ localhost ~] # Df-h

File system capacity in use available % mount point

/Dev/mapper/VolGroup-lv_root

75 GB 50G 22G 70%/

Tmpfs 3.9G 88 K 3.9G 1%/dev/shm

/Dev/sda1 485 M 30 M 430 M 7%/boot

/Dev/mapper/VolGroup-lv_home

15G 170 M 14G 2%/home

[Root @ localhost ~] # Lvreduce-L 15G/dev/mapper/VolGroup-lv_home

WARNING: switching active and open logical volume to 15.00 GiB

This may destroy your data (filesystem etc .)

Do you really want to reduce lv_home? [Y/n]: y

Cing Cing logical volume lv_home to 15.00 GiB

Logical volume lv_home successfully resized

[Root @ localhost ~] # Vgdisplay

--- Volume group ---

VGName VolGroup

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 7

VGAccess read/write

VGStatus resizable

MAXLV 0

CurLV 3

Open LV 3

MaxPV 0

CurPV 1

ActPV 1

VGSize 99.51 GiB

PESize 4.00 MiB

Total PE 25474

Alloc PE/Size 24194/94 .51 GiB

Free PE/Size 1280/5 .00 GiB

CxzV5u-cG1f-HvPd-pE8c-eKrR-dBjN-H07k3I VGUUID

[Root @ localhost ~] # Lvextend-L + 5.00G/dev/mapper/VolGroup-lv_root

Extending logical volume lv_root to 80.57 GiB

Logical volume lv_root successfully resized

[Root @ localhost ~] # Resize2fs-p/dev/mapper/VolGroup-lv_root

Resize2fs 1.41.12 (17-May-2010)

Filesystem at/dev/mapper/VolGroup-lv_rootis mounted on/; on-line resizing required

Old desc_blocks = 5, new_desc_blocks = 6

Ming an on-line resize of/dev/mapper/VolGroup-lv_root to 21121024 (4 k) blocks.

The filesystem on/dev/mapper/VolGroup-lv_root is now 21121024 blocks long.

 

[Root @ localhost ~] # Df-h

File system capacity in use available % mount point

/Dev/mapper/VolGroup-lv_root

80G 50G 27G 66%/

Tmpfs 3.9G 88 K 3.9G 1%/dev/shm

/Dev/sda1 485 M 30 M 430 M 7%/boot

/Dev/mapper/VolGroup-lv_home

15G 170 M 14G 2%/home