This is an initialization script "/etc/init.d/ghost" file which helps you to start, stop, status executable or java -jar file.jar with nohup and & - background option, this is pretend way make a daemon, but maybe will be interested to someone. It uses PID file and checks if the process is running before every start or stop.Once it's configured y…

Ghost - Demonize anything

# Licence: GPLv3, MIT, BSD, Apache or whatever you prefer; FREE to use, modify, copy, no obligations
# Description: Bash Script to Start the process with NOHUP and & - in background, pretend to be a Daemon
# Author: Andrew Bikadorov
# Script v1.5

# Slightly altered, Author: Nikolay Georgiev.
if [ -z "$2" ]; then
                echo "You must specify microservice-name to use this script!"
                exit 1
fi

# For debugging purposes uncomment next line
#set -x

# Config, can be altered
APP_NAME="$2"
APP_FILENAME=`ls -1 ...| tail -1`
APP_PID=".../$APP_NAME/PID"
APP_PATH=".../$APP_NAME"
APP_LOGS=$APP_PATH"/logs"
#for example: APP_PRE_OPTION="java -jar"
APP_PRE_OPTION="java -Dlog4j.configurationFile=${APP_PATH}/etc/log4j2.xml -jar "
APP_POST_OPTION=""
APP_SUCCESS_START_MSG="..."
TIMESTAMP=`date "+%Y-%m-%d-%H-%M"`
APP_START_LOG="${APP_NAME}.${TIMESTAMP}.out"

STATUS_CODE[0]="Is Running"
STATUS_CODE[1]="Not Running"

start() {
    
    checkpid
	STATUS=$?
	if [ $STATUS -ne 0 ] ;
    then
		echo "Starting $APP_NAME..."
        cd ${APP_PATH}
		echo "Executing: nohup ${APP_PRE_OPTION} ${APP_FILENAME} ${APP_POST_OPTION} > ${APP_LOGS}/${APP_START_LOG} 2> ${APP_LOGS}/${APP_NAME}.err < /dev/null &"
        nohup $APP_PRE_OPTION $APP_FILENAME $APP_POST_OPTION > $APP_LOGS/$APP_START_LOG 2> $APP_LOGS/$APP_NAME.err < /dev/null &
        echo PID $!
		echo $! > $APP_PID
        JPPID=`cat $APP_PID`
        sleep 15
        echo grep "'${APP_SUCCESS_START_MSG}'" $APP_LOGS/$APP_START_LOG
        grep "'${APP_SUCCESS_START_MSG}'" $APP_LOGS/$APP_START_LOG
        if [ ! $? ]; then
                echo $APP_SUCCESS_START_MSG " not found in output. Aborting execution."
                kill -9 $JPPID
                exit 1
        fi
        if ! ps -p $JPPID >/dev/null ; then
           wait $JPPID
           echo " PID: $JPPID Exited with: $? "
           tail -n 100 $APP_LOGS/$APP_START_LOG
        fi
		statusit
		#echo "Done"
    else
		echo "$APP_NAME Already Running"
    fi
}

stop() {
    checkpid
	STATUS=$?
	if [ $STATUS -eq 0 ] ;
	then
		echo "Stopping $APP_NAME..."
		APPPID=`ps -ef | grep $APP_NAME |grep -v control | grep -v grep | awk '{print $2}'`
        kill -15 $APPPID
		rm $APP_PID
        sleep 10 
		checkpid
        STATUS=$?
        if [ $STATUS -eq 0 ] ; then
                echo "Hard kill!"
                kill -9 $APPPID
        fi
        statusit
		#echo "Done"
	else
		echo "$APP_NAME - Already killed"
	fi
}

checkpid(){
    ps -ef | grep $APP_NAME | grep -v control.sh | grep -v grep | awk '{print $2}' >$APP_PID 
    ps -ef | grep $APP_NAME | grep -v control.sh | grep -v grep  
    STATUS=$?
	return $STATUS
}

statusit() {
    checkpid
    #GET return value from previous function
	STATUS=$?
	#echo $?
	
	EXITSTATUS=${STATUS_CODE[STATUS]}
	
	if [ $STATUS -eq 0 ] ;
	then
		EXITSTATUS=${STATUS_CODE[STATUS]}" (PID `cat $APP_PID`)"
	fi
    
	
    echo $APP_NAME - $EXITSTATUS
    
}

case "$1" in

    'start')
        start
        ;;

    'stop')
        stop
        #statusit
        ;;

    'restart')
        stop 
        start 
        ;;

    'status')
        statusit
        ;;
        
    *)
        echo "Usage: $0 { start | stop | restart | status } microservice-name"
        exit 1
        ;;
esac

exit 0