Using standard unicorn_init.sh to boot rails app - linux

Question

I have the standard unicorn_init.sh file sym-linked to my /etc/init.d
#!/bin/sh
set -e
# Example init script, this can be used with nginx, too,
# since nginx and unicorn accept the same signals
# Feel free to change any of the following variables for your app:
TIMEOUT=${TIMEOUT-60}
APP_ROOT=<APP HOME DIRECTORY>
PID=$APP_ROOT/tmp/pids/unicorn.pid
CMD="cd $APP_ROOT; $APP_ROOT/bin/unicorn -D -c $APP_ROOT/config/unicorn.rb -E production"
action="$1"
set -u
old_pid="$PID.oldbin"
cd $APP_ROOT || exit 1
sig () {
test -s "$PID" && kill -$1 `cat $PID`
}
oldsig () {
test -s $old_pid && kill -$1 `cat $old_pid`
}
case $action in
start)
sig 0 && echo >&2 "Already running" && exit 0
su -c "$CMD" - <USER>
;;
stop)
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
sig TERM && exit 0
echo >&2 "Not running"
;;
restart|reload)
sig HUP && echo reloaded OK && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
su -c "$CMD" - <USER>
;;
upgrade)
if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
then
n=$TIMEOUT
while test -s $old_pid && test $n -ge 0
do
printf '.' && sleep 1 && n=$(( $n - 1 ))
done
echo
if test $n -lt 0 && test -s $old_pid
then
echo >&2 "$old_pid still exists after $TIMEOUT seconds"
exit 1
fi
exit 0
fi
echo >&2 "Couldn't upgrade, starting '$CMD' instead"
su -c "$CMD" - <USER>
;;
reopen-logs)
sig USR1
;;
*)
echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
exit 1
;;
esac
Saying
service unicorn_<APP NAME> start
app boots no problem and browser resolves all requests
but when I try to stop the service
service unicorn_<APP NAME> stop
I get the error from the file "Not running", I try to restart
service unicorn_<APP_NAME> restart
I get the error:
Couldn't reload, starting 'cd <APP_NAME>; <APP_NAME>/bin/unicorn -D -c <APP_NAME>/config/unicorn.rb -E production' instead
master failed to start, check stderr log for details
I think it is because it loses track of the pid for the worker processes and checking the /tmp/pid area unicorn.pid does not exist and if I create a blank one it makes no difference.
Any help appreciated.