crontab

*/15 * * * * /path/to/restart_if_high_memory.sh >> /tmp/restart_if_high_memory.log 2>&1

restart_if_high_memory.sh

#!/bin/bash -x

set -e

HOME=/path/to/home

cd $HOME

PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"


# returns 1 if usage is higher than 80%
usage=`free -m  | sed -n 2p | awk '{ printf("%d",  ($3/$2)/0.8) }'`

if [ $usage -lt 1 ]; then
  exit 0
fi

cd path/to/current

# sidekiq process can be multiple so find process id and kill then start corresponding to the process.
list=`ps axu|grep sidekiq|grep -v grep|awk '{print $2}'`
for pid in $list; do

	kill -TSTP $pid

	sleep 10

	kill -TERM $file`

	sleep 10

	RAILS_ENV=production bundle exec sidekiq -d

done