Extend Linux root partition

This article lead you How to Extend Linux root Partition

[root@62 ~]# parted /dev/sda

GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 215GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 1049kB 1075MB 1074MB primary xfs boot
2 1075MB 107GB 106GB primary lvm

resizepart 2 100%
print

(parted) resizepart 2 100%
(parted) print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 215GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 1049kB 1075MB 1074MB primary xfs boot
2 1075MB 215GB 214GB primary lvm

(parted) quit
Information: You may need to update /etc/fstab.

Show current disk at VM

[root@62 ~]# df -h

Filesystem Size Used Avail Use% Mounted on
devtmpfs 2.8G 0 2.8G 0% /dev
tmpfs 2.8G 0 2.8G 0% /dev/shm
tmpfs 2.8G 273M 2.6G 10% /run
tmpfs 2.8G 0 2.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 93G 7.1G 86G 8% /
/dev/sda1 1014M 150M 865M 15% /boot
/dev/loop0 3.9G 8.4M 3.7G 1% /tmp
tmpfs 571M 0 571M 0% /run/user/0

show current Phisycal Volume

[root@62 ~]# pvdisplay

--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <98.76 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 25281
Free PE 1
Allocated PE 25280
PV UUID lQWYWH-bMEf-QHpS-xEej-B9G0-su0v-Vj8as7

Resize Phisycal Volume

[root@62 ~]# pvresize /dev/sda2

Physical volume "/dev/sda2" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized

[root@62 ~]# pvdisplay

--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <199.00 GiB / not usable 2.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 50943
Free PE 25663
Allocated PE 25280
PV UUID lQWYWH-bMEf-QHpS-xEej-B9G0-su0v-Vj8as7

Resize Logical Volume

[root@62 ~]# lvresize --extents +100%FREE --resizefs /dev/centos/root

Size of logical volume centos/root changed from 93.00 GiB (23808 extents) to <193.25 GiB (49471 extents).
Logical volume centos/root successfully resized.
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=6094848 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=24379392, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=11904, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 24379392 to 50658304

Now check the updated extended disk space using this command.
show current disk

[root@62 ~]# df -Th

Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 2.8G 0 2.8G 0% /dev
tmpfs tmpfs 2.8G 0 2.8G 0% /dev/shm
tmpfs tmpfs 2.8G 273M 2.6G 10% /run
tmpfs tmpfs 2.8G 0 2.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root xfs 194G 7.1G 187G 4% /
/dev/sda1 xfs 1014M 150M 865M 15% /boot
/dev/loop0 ext4 3.9G 8.4M 3.7G 1% /tmp
tmpfs tmpfs 571M 0 571M 0% /run/user/0

disk partition centos-root mapper now changed from 400 GB to 800 GB !!! Yahoo!

You can watch this video tutorial for better understand.