You have a host with too much space allocated to /home and you need to remove and reallocate it to the root partition. This may be because there are no human users on this server and you just have or need service accounts. Backup any files you need from /home before you start.

1) Get the list of mounted file systems.
> df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 9.1M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rl-root 37G 27G 11G 71% /
/dev/mapper/rl-home 19G 189M 18G 2% /home
/dev/sda1 1014M 342M 673M 34% /boot
vboxshare 477G 104G 373G 22% /media/sf_vboxshare
tmpfs 374M 12K 374M 1% /run/user/42
tmpfs 374M 0 374M 0% /run/user/0

2) Get the filesystem type. In this case it’s xfs. This informs a later step.
> lsblk -f | grep home
└─rl-home xfs 9fd41fcd-e123-40b8-8461-7500b9aaa023 /home

3) Get the volume details. Note the values for LV Path and LV Size.
> lvdisplay /dev/rl/home
— Logical volume —
LV Path /dev/rl/home
LV Name home
VG Name rl
LV UUID z2Kg70-xYsg-Cx11-ROoj-Fl5T-g0Pb-wuksJ9
LV Write Access read/write
LV Creation host, time ryl8, 2022-07-29 14:57:34 -0400
LV Status available
# open 1
LV Size 18.05 GiB
Current LE 4622
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:2

4) Copy any files you need out of /home. Then unmount it as root, not su – root from another user.
> umount /home

5) Using the LV PATH value from lvdisplay above, remove the logical volume for /home.
> lvremove /dev/rl/home
Do you really want to remove active logical volume rl/home? [y/n]: y
Logical volume “home” successfully removed.

6) Make sure the volume is free in the VFree column.
> vgs -v
VG Attr Ext #PV #LV #SN VSize VFree VG UUID VProfile
rl wz–n- 4.00m 1 2 0 <59.00g 18.05g l6h9Zk-Ue9m-7oPJ-iPJK-XdRy-yfqD-zI56bB

7) Extend the free space to the root partition.
a) Extend the root logical volume to take up the free space you just made available.
> lvextend -l +100%FREE /dev/mapper/rl-root
Size of logical volume rl/root changed from 36.98 GiB (9467 extents) to <55.04 GiB (14089 extents).
Logical volume rl/root successfully resized.

b) Grow the filesystem onto the new lv space.
> xfs_growfs /dev/mapper/rl-root
xfs_growfs /dev/mapper/rl-root
meta-data=/dev/mapper/rl-root isize=512 agcount=4, agsize=2423552 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=0 inobtcount=0
data = bsize=4096 blocks=9694208, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=4733, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 9694208 to 14427136

8) df -h to see the changes.
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.8G 0 1.8G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 9.1M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/mapper/rl-root 56G 27G 29G 48% /
/dev/sda1 1014M 342M 673M 34% /boot
vboxshare 477G 104G 373G 22% /media/sf_vboxshare
tmpfs 374M 12K 374M 1% /run/user/42
tmpfs 374M 0 374M 0% /run/user/0

9) Edit /etc/fstab and remove or comment out /home and reboot.
> vi /etc/fstab
#/dev/mapper/rl-home /home xfs defaults 0 0

10) Reboot to seat the changes.
> reboot

11) Create new users as needed. Use /home as a folder on the root volume and not a space wasting logical volume as before.