Added init script for demonizing app

init.d/passenger-datadog-monitor.sh

@@ -0,0 +1,69 @@
+#!/bin/env sh
+#
+# passenger-datadog-monitor
+
+# Source function library.
+. /etc/init.d/functions
+
+RETVAL=0
+prog="passenger-datadog-monitor"
+PIDFILE=/var/run/$prog.pid
+
+
+start() {
+        printf "%s\n" "Starting $prog: "
+        PID=`nohup /usr/bin/passenger-datadog-monitor > /tmp/passenger-datadog-monitor.log 2>&1 & echo $!`
+        RETVAL=$?
+        if [ $RETVAL -eq 0 ]; then
+          echo "$PID" > $PIDFILE
+          printf "%s\n" "Ok"
+        fi
+        return $RETVAL
+}
+
+stop() {
+        echo -n "Shutting down $prog: "
+        PID=`cat $PIDFILE`
+        if [ -f $PIDFILE ]; then
+            kill -9 $PID
+            printf "%s\n" "Ok"
+            rm -f $PIDFILE
+        else
+            printf "%s\n" "pidfile not found"
+        fi
+}
+
+status() {
+        echo -n "Checking $prog status: "
+        if [ -f $PIDFILE ]; then
+            PID=`cat $PIDFILE`
+            if [ -z "`ps axf | grep ${PID} | grep -v grep`" ]; then
+                printf "%s\n" $prog" dead but pidfile exists"
+            else
+                echo $prog" Running"
+            fi
+        else
+            printf "%s\n" $prog" not running"
+        fi
+}
+
+case "$1" in
+    start)
+        start
+        ;;
+    stop)
+        stop
+        ;;
+    status)
+        status
+        ;;
+    restart)
+        stop
+        start
+        ;;
+    *)
+        echo "Usage: $prog {start|stop|status|restart}"
+        exit 1
+        ;;
+esac
+exit $RETVAL