Created
June 9, 2013 19:33
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Bash shell script which let run PROCESS_COMMAND forever until daemon is called with kill parameter.
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#!/usr/bin/env bash | |
SCRIPT_PATH=$(readlink -f $0) | |
DIR=$(dirname $SCRIPT_PATH) | |
PID_DIR="${DIR}/pid" | |
LOG_DIR="${DIR}/log" | |
DAEMON_PID_FILE="${PID_DIR}/daemon.pid" | |
DAEMON_LOG_FILE="${LOG_DIR}/daemon.log" | |
PROCESS_PID_FILE="${PID_DIR}/process.pid" | |
PROCESS_LOG_FILE="${LOG_DIR}/process.log" | |
# Set here whatever you want to run forever! | |
PROCESS_COMMAND="${DIR}/index.js" | |
log() { | |
DATE=`date +"%Y-%m-%d %H:%M:%S"` | |
echo "${DATE} $1" >> $DAEMON_LOG_FILE | |
} | |
start() { | |
touch $PROCESS_PID_FILE | |
nohup $PROCESS_COMMAND &>>$PROCESS_LOG_FILE & | |
echo $! > $PROCESS_PID_FILE | |
PID=$(cat $PROCESS_PID_FILE) | |
log "Process started with $PID" | |
} | |
keep_alive() { | |
if [ -f $PROCESS_PID_FILE ] | |
then | |
PID=$(cat $PROCESS_PID_FILE) | |
if [ $(ps -Ao pid | grep $PID) ] | |
then | |
return | |
else | |
start | |
fi | |
else | |
start | |
fi | |
} | |
stop() { | |
if [ -f $PROCESS_PID_FILE ] | |
then | |
PID=$(cat $PROCESS_PID_FILE) | |
if [ $(ps -Ao pid | grep $PID) ] | |
then | |
kill -TERM $PID | |
fi | |
rm $PROCESS_PID_FILE | |
fi | |
} | |
start_daemon() { | |
log "Starting daemon" | |
touch $DAEMON_PID_FILE | |
echo $$ > $DAEMON_PID_FILE | |
trap stop_daemon INT SIGINT TERM SIGTERM | |
keep_alive | |
while true | |
do | |
keep_alive | |
wait | |
sleep 1 | |
done | |
} | |
stop_daemon() { | |
log "Stopping daemon" | |
stop | |
rm $DAEMON_PID_FILE | |
log "Daemon stopped" | |
exit 0 | |
} | |
if [ ! -d $PID_DIR ] | |
then | |
mkdir $PID_DIR | |
fi | |
if [ ! -d $LOG_DIR ] | |
then | |
mkdir $LOG_DIR | |
fi | |
if [ -f $DAEMON_PID_FILE ] | |
then | |
PID=$(cat $DAEMON_PID_FILE) | |
if [ $(ps -Ao pid | grep $PID) ] | |
then | |
if [ "$1" = "kill" ] | |
then | |
kill -TERM $PID | |
echo "Daemon is killed" | |
else | |
echo "Daemon is running with PID $PID" | |
fi | |
exit 0 | |
fi | |
fi | |
if [ "$1" = "daemon" ] | |
then | |
start_daemon | |
fi | |
if [ "$1" != "kill" ] | |
then | |
nohup "$0" daemon &> /dev/null & | |
fi | |
exit 0 |
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