overlay2_with_xfs_pquota.sh 90% of available du on /home

overlay2_with_xfs_pquota.sh

#!/bin/bash

# Stop the Docker service
systemctl stop docker.service

# Set the target file
target_file="/var/lib/docker.fs"

# Get available space in the home directory in kilobytes
available_space=$(df -k /home | awk 'NR==2 {print $4}')

# Calculate 90% of available space in gigabytes
seek_value=$((available_space * 9 / 10 / 1024 / 1024))  # Convert KB to GB

# Use dd to create a sparse file with 90% of available space in gigabytes
dd if=/dev/zero of="$target_file" bs=1G count=0 seek=$seek_value

# Set permissions to allow only root to read the file
chmod 600 /var/lib/docker.fs

# Force overwrite and format the sparse file with the XFS filesystem
mkfs.xfs -f /var/lib/docker.fs

# Move the existing Docker data directory out of the way
mv /var/lib/docker /var/lib/docker.backup

# Create the new Docker directory and set permissions
mkdir /var/lib/docker
chmod 710 /var/lib/docker

# Create an entry in /etc/fstab for the new filesystem
echo '/var/lib/docker.fs /var/lib/docker xfs loop,pquota 0 0' >> /etc/fstab

# Remount to apply the pquota option needed for disk size limits
#mount -o remount /var/lib/docker
umount /var/lib/docker
mount /var/lib/docker

# Reload systemd
systemctl daemon-reload

# Mount the new filesystem
mount /var/lib/docker

# Move all Docker data to the new filesystem
mv /var/lib/docker.backup/* /var/lib/docker/
rmdir /var/lib/docker.backup

# Start the Docker service
systemctl start docker.service

edit: 810 to 710
https://lowendspirit.com/discussion/comment/172616/#Comment_172616