How to expand root partition in Openwrt VM
First, add space into the Openwrt VM. Taking proxmox as an example, go to Openwrt VM -> hardware -> hard disk -> disk -> action -> resize. Second, copy and paste the follwing into a sh file expand-root.sh: # Configure startup scripts cat << "EOF" > /etc/uci-defaults/70-rootpt-resize if [ ! -e /etc/rootpt-resize ] \ && type parted > /dev/null \ && lock -n /var/lock/root-resize then ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e \ '$9=="/dev/root"{print $3}' /proc/self/mountinfo)")" ROOT_DISK="/dev/$(basename "${ROOT_BLK%/*}")" ROOT_PART="${ROOT_BLK##*[^0-9]}" parted -f -s "${ROOT_DISK}" \ resizepart "${ROOT_PART}" 100% mount_root done touch /etc/rootpt-resize reboot fi exit 1 EOF cat << "EOF" > /etc/uci-defaults/80-rootfs-resize if [ ! -e /etc/rootfs-resize ] \ && [ -e /etc/rootpt-resize ] \ && type losetup > /dev/null \ && type resize2fs > /dev/null \ && lock -n /var/lock/root-resize then ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e \ '$9=="/dev/root"{print $3}' /proc/self/mountinfo)")" ROOT_DEV="/dev/${ROOT_BLK##*/}" LOOP_DEV="$(awk -e '$5=="/overlay"{print $9}' \ /proc/self/mountinfo)" if [ -z "${LOOP_DEV}" ] then LOOP_DEV="$(losetup -f)" losetup "${LOOP_DEV}" "${ROOT_DEV}" fi resize2fs -f "${LOOP_DEV}" mount_root done touch /etc/rootfs-resize reboot fi exit 1 EOF cat << "EOF" >> /etc/sysupgrade.conf /etc/uci-defaults/70-rootpt-resize /etc/uci-defaults/80-rootfs-resize EOF Last, run the sh file: ./expand-root.sh