LVM

#Externding the root disk
1. first run this:

-- df -hT -> helps view disk information

#second, create the additional disk space for the VM e.g. 100GB

#To view the created disk, run  

-- fdisk -l

#After vieweing the volume, run

-- fdisk /dev/xvdb

#Then select 

'n' -> for new 
'p' -> for primary
't' -> for type
'8e'-> for Linux LVM
'p' -> for printing volumes already created
'w' -> to write changes 

#To view volumes

-- vgs 

reslt:  VG #PV #LV #SN Attr   VSize   VFree
  cl   1   2   0 wz--n- <49.00g 4.00m

#Create a physical Volume

-- pvcreate /dev/xvdb1 

#Extending the Volume Group

-- vgextend cl /dev/xvdb1

#Extending the logical volume Group (LVM)

-- lvextend /dev/cl/root -l +100%FREE 

#Grow the file system to make use of the new storage 

-- xfs_growfs /dev/cl/root 

OR 

-- xfs_growfs /

# To view if the changes have taken effect, 

-- df -hT

#If it is debian use

-- resize2fs /dev/cl/root 
#
#Other alternatives
-- https://devops.ionos.com/tutorials/increase-the-size-of-a-linux-root-partition-without-rebooting/