Bosun init.d 指令碼

這是 Bosun 的 init.d 指令碼，其中包括設定環境變數，可用於隱藏原始配置中的機密。它使用 http://software.clapper.org/daemonize/ 將程式作為守護程式執行。

#!/bin/sh
#
# /etc/rc.d/init.d/bosun
# bosun
#
# chkconfig: - 98 02
# description: bosun

### BEGIN INIT INFO
# Provides:          bosun
# Required-Start:    networking
# Required-Stop:     networking
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Runs teh bosun
# Description:       bosun

### END INIT INFO
# Source function library.
. /etc/rc.d/init.d/functions

base_dir="/opt/bosun"
exec="/opt/bosun/bosun"
prog="bosun"
config="${base_dir}/config/prod.conf"

[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog

lockfile=/var/lock/subsys/$prog
pidfile=/var/run/bosun.pid
logfile=/var/log/$prog.log

#These "secrets" can be used in the prod.conf using syntax like ${env.CHAT} or ${env.API_KEY}
export CHAT=https://chat.company.com/rooms/123?key=123456789012345678901234567890
export API_KEY=123456789012345678901234567890

check() {
    $exec -t -c $config
    if [ $? -ne 0 ]; then
       echo "Errors found in configuration file, check it with '$exec -t'."
       exit 1
    fi
}

start() {
    [ -x $exec ] || exit 5
    [ -f $config ] || exit 6
    check
    echo -n $"Starting $prog: "
    # if not running, start it up here, usually something like "daemon $exec"
    ulimit -n 65536
    daemon daemonize -a -c $base_dir -e $logfile -o $logfile  -p $pidfile -l $lockfile $exec -c $config $OPTS
    retval=$?
    echo
    [ $retval -eq 0 ] && touch $lockfile
    return $retval
}

stop() {
    echo -n $"Stopping $prog: "
    # stop it here, often "killproc $prog"
    killproc -p $pidfile -d 5m
    retval=$?
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}

restart() {
    check
    stop
    start
}

reload() {
    restart
}

force_reload() {
    restart
}

rh_status() {
    # run checks to determine if the service is running or use generic status
    status $prog
}

rh_status_q() {
    rh_status >/dev/null 2>&1
}

case "$1" in
    start)
        rh_status_q && exit 0
        $1
        ;;
    stop)
        rh_status_q || exit 0
        $1
        ;;
    restart)
        $1
        ;;
    reload)
        rh_status_q || exit 7
        $1
        ;;
    force-reload)
        force_reload
        ;;
    status)
        rh_status
        ;;
    condrestart|try-restart)
        rh_status_q || exit 0
        restart
        ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
        exit 2
esac