DRBD Autopromote

drbd-autopromote

#!/usr/bin/env bash
if [ -z "$1" ]
then
  echo "Please specify resource to promote."
  echo "  drbd-autopromote r0"
  exit 1
fi

resource="$1"
mountpoint="/mnt/btrfs"

# find the device for this resource
device=$(cat /etc/drbd.d/"$resource".res | grep "^\s\+device" | head -n 1 | awk '{print $2}' | sed 's/\;//g')
if [ -z "$device" ]
then
 echo "Could not find drbd device for $resource"
fi

# continually check ideal conditions before mounting and starting docker
while true
do
  if /bin/mount | grep "^$device " > /dev/null
  then
    sudo service docker start
    exit 0
  fi

  # verify that resource is connected
  if ! /sbin/drbdadm cstate "$resource" 2>/dev/null | grep "^Connected$" > /dev/null
  then
    echo "$(/bin/date) Resource $resource is not connected"
    sleep 5
    continue
  fi

  # verify that resource is uptodate
  if ! /sbin/drbdadm dstate "$resource" 2>/dev/null | grep "^UpToDate/UpToDate$" > /dev/null
  then
    echo "$(/bin/date) Resource $resource is not up to date"
    sleep 5
    continue
  fi

  # verify the resource is secondary everywhere
  if ! /sbin/drbdadm role "$resource" 2>/dev/null | grep "^Secondary/Secondary$" > /dev/null
  then
    echo "$(/bin/date) Resource $resource is not secondary everywhere"
    sleep 5
    continue
  fi

  # set the resource as primary
  if ! /sbin/drbdadm primary $resource 2>/dev/null
  then
    echo "$(/bin/date) Set resource $resource to primary failed"
    sleep 5
    continue
  fi

  # mount the device
  if ! /bin/mount $device $mountpoint
  then
    echo "$(/bin/date) Mount $device to $mountpoint failed"
    sleep 5
    continue
  fi

done