Heroku scheduled restarts

heroku_restart.sh

#!/bin/bash

# Set up the Heroku scheduler to run this command every hour.

# Source: https://gist.github.com/ralph/b1b4023e0c03aa8c68f8219cd089de46

utc_hour=`date -u +'%H' | sed 's/^0*//'`
modulo="${RESTART_EVERY_X_HOURS:-6}"
n=$(($utc_hour % $modulo))
echo $n

echo "Current UTC hour is ${utc_hour}, restarting every ${modulo} hours."

if [[ "$n" -eq 0 ]]; then
  echo "Restarting..."
  curl -i -n -X DELETE https://api.heroku.com/apps/${HEROKU_APP_NAME}/dynos \
    -H "Authorization: Bearer ${HEROKU_TOKEN}" \
    -H "Content-Type: application/json" \
    -H "Accept: application/vnd.heroku+json; version=3"
fi