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+# Eigentlich lässt sich ein EXT4 Dateisystem nicht online verkleinern.
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+# Auf serverfault.com ist unter https://serverfault.com/a/888830/329677
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+# jedoch ein eleganten Weg über die initramfs beschrieben:
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+
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+
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+# resize using initramfs
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+# --- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
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+disk="/dev/sda1"
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+disk-size="25G"
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+
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+### Prepare /etc/initramfs-tools/hooks/resizefs
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+touch /etc/initramfs-tools/hooks/resizefs
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+chmod +x /etc/initramfs-tools/hooks/resizefs
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+cat >/etc/initramfs-tools/hooks/resizefs<<'EOF'
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+#!/bin/sh
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+
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+set -e
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+
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+PREREQS=""
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+
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+prereqs() { echo "$PREREQS"; }
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+
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+case $1 in
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+ prereqs)
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+ prereqs
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+ exit 0
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+ ;;
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+esac
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+
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+. /usr/share/initramfs-tools/hook-functions
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+
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+copy_exec /sbin/e2fsck
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+copy_exec /sbin/resize2fs
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+
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+exit 0
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+EOF
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+
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+
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+### Prepare /etc/initramfs-tools/scripts/local-premount/resizefs
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+touch /etc/initramfs-tools/scripts/local-premount/resizefs
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+chmod +x /etc/initramfs-tools/scripts/local-premount/resizefs
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+cat >/etc/initramfs-tools/scripts/local-premount/resizefs<<'EOF'
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+#!/bin/sh
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+
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+set -e
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+
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+PREREQS=""
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+
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+prereqs() { echo "$PREREQS"; }
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+
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+case "$1" in
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+ prereqs)
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+ prereqs
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+ exit 0
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+ ;;
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+esac
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+
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+/sbin/e2fsck -yf $disk
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+/sbin/resize2fs $disk $disk-size
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+/sbin/e2fsck -yf $disk
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+EOF
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+
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+
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+### Prepare initramfs and reboot
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+update-initramfs -u
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+reboot
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+
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+### Cleanup
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+rm /etc/initramfs-tools/hooks/resizefs
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+rm /etc/initramfs-tools/scripts/local-premount/resizefs
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+update-initramfs -u
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+
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+
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+# Change parition size
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+# --- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
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+tune2fs -l /dev/sda1 | grep "Block "
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+# Block count: 6553600
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+# Block size: 4096
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+
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+# This equals
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+# 6553600 blocks * 4096 bytes / block = 26843545600 bytes
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+# 26843545600 / (1024^3) = 25 GB
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+
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+fdisk -l /dev/sda
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+# Sector size 512 bytes
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+# Start 2048
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+
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+# Calculating last sector
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+# 26843545600 bytes / 512 bytes/sector = 52428800 sectors
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+# 52428800 sectors + 2048 to start from = 52430848
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+
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+
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+fdisk /dev/sda
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+# - Delete partition
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+# - Create new starting with 2048 and end with 52430848
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