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resize rootfs with out need of LiveCD (w/ or w/o LVM) - need to reboot once.
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#!/bin/bash | |
# | |
# Resize root filesystem during boot. | |
# | |
# Alternative: http://www.ivarch.com/blogs/oss/2007/01/resize-a-live-root-fs-a-howto.shtml | |
# New size of root filesystem | |
ROOT_SIZE="100G" | |
# Check current filesystem type | |
ROOT_FS_TYPE="$(sed -n -e 's|^/dev/\S\+ / \(ext4\) .*$|\1|p' /proc/mounts)" | |
test "$ROOT_FS_TYPE" == ext4 || exit 100 | |
# Copy e2fsck and resize2fs to initrd | |
cat > /etc/initramfs-tools/hooks/resize2fs <<"EOF" | |
#!/bin/sh | |
PREREQ="" | |
prereqs() { | |
echo "$PREREQ" | |
} | |
case "$1" in | |
prereqs) | |
prereqs | |
exit 0 | |
;; | |
esac | |
. /usr/share/initramfs-tools/hook-functions | |
copy_exec /sbin/findfs /sbin | |
copy_exec /sbin/e2fsck /sbin | |
copy_exec /sbin/resize2fs /sbin | |
EOF | |
chmod +x /etc/initramfs-tools/hooks/resize2fs | |
# Execute resize2fs before mounting root filesystem | |
cat > /etc/initramfs-tools/scripts/local-premount/resize <<"EOF" | |
#!/bin/sh | |
PREREQ="" | |
prereqs() { | |
echo "$PREREQ" | |
} | |
case "$1" in | |
prereqs) | |
prereqs | |
exit 0 | |
;; | |
esac | |
# Convert root from possible UUID to device name | |
echo "root=${ROOT} " | |
ROOT_DEVICE="" | |
for x in $(cat /proc/cmdline); do | |
case ${x} in | |
root=*) | |
value=${x#*=} | |
# Find the device node path depending on the form of root= : | |
case ${value} in | |
UUID=*) | |
ROOT_DEVICE=/dev/disk/by-uuid/${value#UUID=} | |
;; | |
LABEL=*) | |
ROOT_DEVICE=/dev/disk/by-label/${value#LABEL=} | |
;; | |
*) | |
ROOT_DEVICE=${value} | |
;; | |
esac | |
;; | |
esac | |
done | |
echo "root device name is ${ROOT_DEVICE} " | |
# Check root filesystem | |
/sbin/e2fsck -y -v -f "$ROOT_DEVICE" || echo "e2fsck: $? " | |
# Resize | |
# debug-flag 8 means debug moving the inode table | |
/sbin/resize2fs -d 8 "$ROOT_DEVICE" "$ROOT_SIZE" || echo "resize2fs: $? " | |
EOF | |
sed -i "s/\$ROOT_SIZE/$ROOT_SIZE/g" /etc/initramfs-tools/scripts/local-premount/resize | |
chmod +x /etc/initramfs-tools/scripts/local-premount/resize | |
# Regenerate initrd | |
update-initramfs -u | |
# Remove files | |
rm -f /etc/initramfs-tools/hooks/resize2fs /etc/initramfs-tools/scripts/local-premount/resize | |
reboot | |
# List files in initrd | |
# lsinitramfs /boot/initrd.img-*-amd64 | |
# Remove files from initrd after reboot | |
# update-initramfs -u |
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