Increasing the root Filesystems disk space [closed] - linux

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This is probably a stupid question, but I have a centos VM which I allocated a 20GB disk to. I've since realized that is way to small for my needs. In virtualbox I've increase the size of the disk by 100GB, and I've assigned that to a new physical volume in the vm. I've added that volume to the same volume group and logical group as my root file system, but I'm not seeing any change in size available to the file system.
What do I need to do to allocate more space to the file system?
[root#localhost ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 9.5M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 18G 17G 353M 98% /
/dev/sda1 1014M 270M 745M 27% /boot
tmpfs 1.6G 32K 1.6G 1% /run/user/1000
[root#localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size 19.04 GiB / not usable 0
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 4875
Free PE 0
Allocated PE 4875
PV UUID OyPa3x-9gvv-wn7u-H9V4-GZUr-NvXS-rUyb29
--- Physical volume ---
PV Name /dev/sda3
VG Name centos
PV Size <110.50 GiB / not usable 3.25 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 28287
Free PE 128
Allocated PE 28159
PV UUID gP1ANK-7qVz-91bX-I5e0-Jhhj-P12c-rlyQXm
[root#localhost ~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size <129.54 GiB
PE Size 4.00 MiB
Total PE 33162
Alloc PE / Size 33034 / <129.04 GiB
Free PE / Size 128 / 512.00 MiB
VG UUID w3y0SR-KCrW-njIZ-i1yU-Wx9A-c6jJ-iLSqtM
[root#localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID DNZWst-UWUa-pAw5-PJQ1-8UNl-AjfV-zsjTRv
LV Write Access read/write
LV Creation host, time localhost, 2020-09-01 16:00:13 +0100
LV Status available
# open 2
LV Size 2.00 GiB
Current LE 513
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID Yz0o0j-B164-JNi3-y5jd-Q9oo-EFe6-ecMgaM
LV Write Access read/write
LV Creation host, time localhost, 2020-09-01 16:00:14 +0100
LV Status available
# open 1
LV Size <127.04 GiB
Current LE 32521
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0

Answer 1

It seems you already resized the logical volume, so the last step is to resize the file system to match. Most current filesystems can be grown on-line while the system is running and the filesystem is mounted. Each has its own tool.
For example for ext* you would run resize2fs /dev/mapper/centos-root .
This needs no more arguments, by default it grows to the size of the partition/volume it's in.
The current default filesystem for centos is xfs, the command for that is xfs_growfs .

Answer 2

First tell the kernel about the new partitions using partprobe:
partprobe
we need to resize our filesystem on /dev/sda(your root volume).You can first start with checking the filesystem on the partition using the e2fsck command and then resize it.
e2fsck -f /dev/(your root volume)
resize2fs /dev/(your root volume)