garbd (Galera Arbitrator) init script

etc_garbd

GARBD_ADDRESS="gcomm://192.168.1.2"
GARBD_GROUP="my_snazzy_cluster"

garbd

### BEGIN INIT INFO
# Provides:          garbd
# Required-Start:    $network
# Required-Stop:     $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start garbd at boot time
# Description:       Enables Galera Arbitrator service. By Mike Green <[email protected]>
### END INIT INFO

PATH=/bin:/sbin:/usr/bin:/usr/sbin

DAEMON=/usr/bin/garbd
[ -x "$DAEMON" ] || exit 0

NAME=garbd
DESC="Galera Arbitrator"
VERBOSE=yes
GARBD_LOG="/var/log/garbd.log"
GARBD_ADDRESS=""
GARBD_GROUP=""

[ -r /etc/garbd ] && . /etc/garbd

. /lib/init/vars.sh
. /lib/lsb/init-functions

LISTEN_PORT=4567
PIDFILE="/var/run/${NAME}.pid"
SCRIPTNAME=${0##*/}
SCRIPTNAME=${SCRIPTNAME#[SK]??}
ACTION="$1"

## Checks if garbd is running
#
# check_alive insists on garbd listening
# check_dead also fails if there is a lost garbd in the process list
#
# Usage: boolean garbd_status [check_alive|check_dead]
garbd_status () {
    # Check if listening
    port_output=`lsof -i TCP:${LISTEN_PORT} | wc -l`
    port_alive=0
    if [ "$port_output" -gt 0 ]; then port_alive=1; fi

    # Check if alive
    ps_alive=0
    if [ -f "$PIDFILE" ] && ps `cat $PIDFILE` >/dev/null 2>&1; then ps_alive=1; fi

    if [ "$1" = "check_alive"  -a  $port_alive = 1 ] ||
       [ "$1" = "check_dead"   -a  $port_alive = 0  -a  $ps_alive = 0 ]; then
        return 0 # EXIT_SUCCESS
    else
        return 1 # EXIT_FAILURE
    fi
}

case "$ACTION" in
    start)
        log_daemon_msg "Starting $DESC" "$NAME"
        start-stop-daemon --start --quiet --pidfile $PIDFILE --make-pidfile --background --exec $DAEMON -- \
            --log $GARBD_LOG --address $GARBD_ADDRESS --group $GARBD_GROUP

        for i in 1 2 3 4 5 6 7 8 9 10; do
            sleep 1
            if garbd_status check_alive; then break; fi
            log_progress_msg "."
        done

        sleep 3

        if garbd_status check_alive; then
            log_end_msg 0
        else
            log_end_msg 1
            log_failure_msg "Please take a look at ${GARBD_LOG}"
        fi
        ;;

    stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        if ! garbd_status check_dead; then
            start-stop-daemon --oknodo --stop --quiet --pidfile $PIDFILE --exec $DAEMON

            sleep 1

            if ! garbd_status check_dead; then
                log_end_msg 1
                log_daemon_msg "Killing $DESC by signal" "$NAME"

                killall -15 garbd

                server_down=
                for i in 1 2 3 4 5 6 7 8 9 10; do
                    sleep 1
                    if garbd_status check_dead; then server_down=1; break; fi
                done
                if test -z "$server_down"; then killall -9 garbd; fi
            else
                rm $PIDFILE
            fi
        fi

        sleep 1

        if ! garbd_status check_dead; then
            log_end_msg 1
            log_failure_msg "Please stop garbd manually!"
            exit -1
        else
            log_end_msg 0
        fi
        ;;

    restart|force-reload)
        /etc/init.d/garbd stop
        /etc/init.d/garbd start
        ;;

    status)
        if garbd_status check_alive; then
            log_action_msg "$DESC is running"
        else
            log_action_msg "$DESC is stopped"
            exit 3
        fi
        ;;
    *)
        echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload|status}" >&2
        exit 3
        ;;
esac

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