# Extract last digit from Availability Zone ID
az_id = node['ec2']['placement_availability_zone_id']
day_number = az_id[-1].to_i % 7

cron 'custom_staggered_reboot' do
  weekday day_number
  hour 2
  minute 0
  command 'test -f /var/run/reboot-required && /sbin/reboot'
end