**For example, Shrink /home partition and add more space on CentOS
Before state:
╭─root@centos ~
╰─# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 2.1G 48G 5% /
devtmpfs 233M 0 233M 0% /dev
tmpfs 244M 0 244M 0% /dev/shm
tmpfs 244M 17M 227M 7% /run
tmpfs 244M 0 244M 0% /sys/fs/cgroup
/dev/sda1 1014M 229M 786M 23% /boot
/dev/mapper/centos-home 45G 54M 45G 1% /home
tmpfs 49M 0 49M 0% /run/user/0
XFS filesystem cannot be shrunk. So your best bet is to backup /home, remove and recreate its volume in a smaller size and give the rest to your /root volume: bash
# backup the contents of /home:
tar -czvf /root/home.tgz -C /home .
#test the backup
tar -tvf /root/home.tgz
#unmount home
umount /dev/mapper/centos-home
#remove the home logical volume
lvremove /dev/mapper/centos-home
#recreate a new 10GB logical volume for /home, format and mount it
lvcreate -L 10GB -n home centos
mkfs.xfs /dev/centos/home
mount /dev/mapper/centos-home
#extend your /root volume with ALL of the remaining space and resize (-r) the file system while doing so
lvextend -r -l +100%FREE /dev/mapper/centos-root
#restore your backup
tar -xzvf /root/home.tgz -C /home
Check /etc/fstab for any mapping of /home volume. IF it is using UUID you should update the UUID portion. (Since we created a new volume, UUID has changed):
In my case UUID was not used to map the /home volume:
After state:
#
# /etc/fstab
# Created by anaconda on Mon Sep 24 10:56:08 2018
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
UUID=fd76016e-9e81-4b8f-839a-65d37acd6b20 /boot xfs defaults 0 0
/dev/mapper/centos-home /home xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0