ActiveMQ 5 - Unix daemon

[David Blundell <da...@100percentit.com>]

I am testing ActiveMQ 5 (20070702.220514-14) on RHEL 64 bit.


As the shutdown script is not present in ./bin I tried to use the
./bin/linux/activemq wrapper to start the program as a daemon.  I got an
error that libwrapper.so could not be loaded as it was a 32 bit Wrapper.  To
fix this I added the latest 64 bit release of wrapper (3.2.3).


This allowed me to run "./bin/linux/activemq start" without errors but
ActiveMQ was not started.  The log just showed that the wrapper stopped. 
When I turned on debugging I could not see anything wrong - the only lines
that seemed relevant were:


INFO   | jvm 1    | 2007/07/03 23:29:51 | WrapperSimpleApp: main method
completed
INFO   | jvm 1    | 2007/07/03 23:29:51 | WrapperSimpleApp: start(args) end. 
Main Completed=true, exitCode=null
INFO   | jvm 1    | 2007/07/03 23:29:51 | WrapperListener.start runner
thread stopped.
...
DEBUG  | wrapper  | 2007/07/03 23:29:54 | Signal trapped.  Details:
DEBUG  | wrapper  | 2007/07/03 23:29:54 |   signal number=17 (SIGCHLD),
source="unknown"

I tried setting up the same snapshot of ActiveMQ on OS X 10.4.10 and while
the 32 bit libwrapper.so worked fine I had a similar lack of results (other
than receiving "signal number=20" rather than 17).


I could not find any relevant open issues on the wrapper or the shutdown
script so it may be that I'm missing something obvious.


I wanted to run ActiveMQ as a daemon and log all output to syslog with a
prefix of "activemq".  As I could not get the wrapper to work I added an
activemq user and wrote a new init.d file.  It is similar to the details at
http://activemq.apache.org/unix-service.html but it works for ActiveMQ 5
snapshots where shutdown is not present.  It also outputs everything to
syslog and adds "status" to the existing start, stop and restart commands:



#!/bin/bash
#
# chkconfig: 345 99 01
# description: Message queue
#
PROG=activemq
PROG_USER=activemq
DAEMON_HOME=/opt/activemq
DAEMON=$DAEMON_HOME/bin/$PROG
LOCKFILE=/var/lock/subsys/$PROG
PIDFILE=/var/run/$PROG.pid

test -x $DAEMON || exit 0

# Source function library.
. /etc/rc.d/init.d/functions

RETVAL=0

usage () {
    echo "Usage: service $PROG {start|stop|restart|status}"
    RETVAL=1
}

start () {
        echo -n $"Starting $PROG: "
        if [ ! -e $LOCKFILE ]; then
                cd $DAEMON_HOME
                sudo -u $PROG_USER $DAEMON > >(logger -t $PROG) 2>&1 &
        else
                echo -n "Lockfile exists"
                false
        fi
        RETVAL=$?
        if [ $RETVAL -eq 0 ]; then
                logger -t activemq "starting $PROG."
                echo $! > $PIDFILE
                touch $LOCKFILE
        else
                logger -t activemq "unable to start $PROG."
        fi
        [ $RETVAL -eq 0 ] && success $"$PROG startup" || failure $"$PROG
startup"
        echo
}

stop () {
        echo -n "Shutting down $PROG: "
        killproc -p $PIDFILE -d 20
        RETVAL=$?
        echo
        [ $RETVAL = 0 ] && rm -f $LOCKFILE
}

case "$1" in
    start) start ;;
    stop) stop ;;
    restart|reload)
        stop
        start
        ;;
    status)
        status $PROG -p $PIDFILE
        RETVAL=$?
        ;;
    *) usage ;;
esac

exit $RETVAL


My questions are: Am I doing something wrong with the wrapper?  Has the
shutdown script been removed permanently (if so I hope the init script above
helps)?


Thanks, David.

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