ZFS zpool for docker

zfs-for-docker.sh

#!/bin/bash

## This will only work on Ubuntu 16.04 and up

DEVNAME=/dev/xvdg

# Install ZFS if we don't have it
if [[ -z $(which zfs) ]]; then
  apt -y update
  apt -y install zfs
fi

# Create zpool

# Check that the zpool doesn't already exist
zpool_success=false
if [[ $(zfs list | grep docker) -eq 0 ]]; then

  # check that the device exists
  if [[ -e "$DEVNAME" ]]; then

    # and isn't mounted
    if [[ $(mount | grep -c "$DEVNAME") -eq 0 ]]; then

      zpool create -f zpool-docker $DEVNAME
      zpool_success=true

    else 

      echo "FATAL: device $DEVNAME is already mounted"
      exit 1

  else

    echo "FATAL: device $DEVNAME does not exist"
    exit 1
  
  fi
fi

# Create and mount the filesystem
if [[ $zpool_success == true ]]; then
  unset $zpool_success
  zfs create -o mountpoint=/var/lib/docker zpool-docker/docker

else
  echo "FATAL: zpool was not created; check previous messages"
  exit 1
fi