Resizing a vagrant centos disk... the hard way

resize.sh

#!/usr/bin/env bash

# Resizing a vagrant centos disk... the hard way

set -o errexit
set -o nounset
set -o pipefail
set -o xtrace

vagrant up
vagrant halt

# disk size in MB (default 100GB)
DISK_SIZE=${1:-102400}

PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE}")/.." && pwd)"

VM_NAME="dcos-docker"
VBOX_VM_DIR="${HOME}/VirtualBox VMs/${VM_NAME}"

cd "${VBOX_VM_DIR}"

OLD_DISK_NAME="$(VBoxManage showvminfo "${VM_NAME}" | grep '.vmdk' | sed "s:.*\\${VM_NAME}/\(.*.vmdk\).*:\1:")"
TEMP_DISK_NAME="clone-disk1.vdi"
NEW_DISK_NAME="new-disk1.vmdk"

# if the following clonehd fails, you may need to nuke your vbox disks:
# VBoxManage list hdds | grep "^UUID:" | sed 's/UUID:[ \t]*//' | xargs -n1 VBoxManage closemedium disk

# clone, resize, and reformat
VBoxManage clonehd "${OLD_DISK_NAME}" "${TEMP_DISK_NAME}" --format vdi
VBoxManage modifyhd "${TEMP_DISK_NAME}" --resize ${DISK_SIZE}
VBoxManage clonehd "${TEMP_DISK_NAME}" "${NEW_DISK_NAME}" --format vmdk

rm "${TEMP_DISK_NAME}"

CONTROLLER_NAME="$(VBoxManage showvminfo "${VM_NAME}" | grep 'Storage Controller Name' | sed 's/Storage Controller Name (0):[ \t]*//')"

# attach new disk as the primary storage device
VBoxManage storageattach "${VM_NAME}" --storagectl "${CONTROLLER_NAME}" --port 0 --device 0 --type hdd --medium "${NEW_DISK_NAME}"

cd "${PROJECT_ROOT}"

vagrant up
#vagrant ssh -c "sudo /vagrant/vagrant/resize-inner.sh"

vagrant ssh << EOFOUTER
set -o errexit
set -o nounset
set -o pipefail
set -o xtrace

sudo su -

# NOTE: Must be run as root!

# Programmatically script fdisk input.
# The sed script strips the comments, which are present for maintainability.
# Blank lines will use the default option.
# TODO: find a way to ignore 'ioctl' error without ignoring all errors
sed -e 's/\s*\([\+0-9a-zA-Z]*\).*/\1/' << EOF | fdisk /dev/sda || true
  n # new partition
  p # primary partition
  3 # partition number 3
    # default - start at beginning of disk
    # default - extend partition to end of disk
  t # change partition type
  3 # partition number 3
  8e # set to Linux LVM (hex code)
  p # print the in-memory partition table
  w # write the partition table and quit
EOF

# refresh disk partition without rebooting
partprobe

# create physical volume from partition
pvcreate /dev/sda3

# add the new physical volume to the centos volume group
vgextend centos /dev/sda3

# resize the root logical volume to include the new space
lvextend -l +100%FREE /dev/mapper/centos-root

# grow the root file-system to fit the logical volume
xfs_growfs /dev/centos/root

# print new disk sizes (root & boot are xfs on centos)
df -h -t xfs
EOFOUTER

# nuke the old disk, now that we know we suceeded
rm "${VBOX_VM_DIR}/${OLD_DISK_NAME}"