Monitor Sidekiq up or down with Shell Script.

sidekiq-monitor.sh

process='sidekiq' # process name, you can use this to monitor any process
project_path="/home/ubuntu/apps/demo/" # This is the one you got to change on your side for your server.

#change it based on your configs.
start_service="bundle exec sidekiq -d -C /home/ubuntu/apps/demo/config/sidekiq.yml -i 0 -P  /home/ubuntu/apps/demo/tmp/pids/sidekiq.pid -L /home/ubuntu/apps/demo/log/sidekiq.log"

# Method to simply store last run time in monitor.log file.
function update_last_run() {
	current_time=$(date +'%d/%m/%Y %H:%M:%S')
	echo "Last run: $current_time" > monitor.log
}

# Method to start the service, simply we need to navigate to project folder and run the start process command. $? will return status code of last command, if is not equal to zero then some thing went wrong. Successful command will always return 0 as exit code. 
function start_service() {
cd $project_path && $start_service
	if [ "$?" == "0" ]
		then
		echo "$process started successfully"
	else
		echo "Could not start process $process"
	fi
}

function check_process()
{
	process_id=$(/bin/ps -fu $USER| grep $process | grep -v "grep" | awk '{print $2}')
	echo "checking process $process"
        # if $process_id is empty, then it got stopped and you have to start it again
	if [ "$process_id" == "" ]
	then
	echo "Process is not running"
	echo  "Starting the process"
	start_service
	else
		echo "Process is running, PID: $process_id"
	fi
	update_last_run
}