github.com/klaytn/klaytn@v1.10.2/build/rpm/etc/init.d/kbnd

#!/bin/bash
#
# kbnd         Startup script for the kbn
#
# chkconfig: - 85 15
# description : kbnd is Klaytn boot node daemon
#
# processname: kbnd
# config:  /etc/kbnd/conf/kbnd.conf
# pidfile: /var/run/kbnd.pid
#

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

if [ -f /etc/kbnd/conf/kbnd.conf ]; then
        . /etc/kbnd/conf/kbnd.conf
fi

kbn=/usr/bin/kbn
prog=kbnd
lockfile=${LOCKFILE-/var/lock/subsys/kbnd}
pidfile=${PIDFILE-/var/run/kbnd.pid}
auto_restart_daemon_pidfile=/var/run/restart_daemon_kbnd.pid
RETVAL=0
STOP_TIMEOUT=${STOP_TIMEOUT-10}

__pid_run() {
  __pids_var_run $prog $pidfile
}

__auto_restart_daemon_pid_run() {
    unset auto_restart_daemon_pid
    if [ ! -f $auto_restart_daemon_pidfile ]; then
        return
    fi
    AUTO_RESTART_DAEMON_PID_NUM=$(cat $auto_restart_daemon_pidfile)
    if [[ ! -z "$AUTO_RESTART_DAEMON_PID_NUM" ]]; then
        export auto_restart_daemon_pid=$(ps -p $AUTO_RESTART_DAEMON_PID_NUM -o pid=)
    fi
}
#------------------------Related Auto restart daemon functions-----------------------------
__auto_restart_daemon() {
    local backOffTime=$AUTO_RESTART_INTERVAL
    local coeff=2
    while :
    do
        sleep 1
        __pid_run
        if [ -z "$pid" ]; then
            echo "INFO[`date`] node[${PID_NUM}] is down"
            if [ -f $pidfile ]; then
                echo "INFO[`date`] remove redundant pid file"
                rm -f ${lockfile} ${pidfile}
            fi
            echo "INFO[`date`] Sleep for backOffTime.... ${backOffTime} seconds."
            sleep $backOffTime
            echo -n "INFO[`date`] "
            start_node
            backOffTime=$(echo $backOffTime $coeff | awk '{printf "%.1f\n",$1*$2}')

            echo "INFO[`date`] backOffTime = ${backOffTime}, Restarted node pid = ${PID_NUM}"
            PID_NUM=$(cat $pidfile)
            echo ""
        fi
    done
}

start_auto_restart_daemon() {
    __auto_restart_daemon_pid_run
    if [ -z $auto_restart_daemon_pid ]; then
        __auto_restart_daemon >> ${LOG_DIR}/restart_daemon.out 2>&1 &
        disown
        AUTO_RESTART_DAEMON_PID_NUM=$!
        AUTO_RESTART_DAEMON_RETVAL=$?

        set +f
        if [ $AUTO_RESTART_DAEMON_RETVAL = 0 ]; then
            echo $AUTO_RESTART_DAEMON_PID_NUM > ${auto_restart_daemon_pidfile}
            echo "Success to start auto restart daemon."
        else
            echo "Fail to start auto restart daemon."
        fi
    fi
}

stop_auto_restart_daemon() {
    echo -n "Shutting down auto restart daemon: "
    killproc -p ${auto_restart_daemon_pidfile} -d ${STOP_TIMEOUT}
    RETVAL=$?
    echo
    [ $RETVAL = 0 ] && rm -f ${auto_restart_daemon_lockfile} ${auto_restart_daemon_pidfile}
}

status_auto_restart_daemon() {
    __auto_restart_daemon_pid_run
    if [ -n "$auto_restart_daemon_pid" ]; then
        echo "auto restart daemon is running."
    else
        echo "auto restart daemon is down."
    fi
}

#------------------------Related to Klaytn node functions-----------------------------

start_node() {
    echo -n "Starting $prog: "
    if [ ! -d ${LOG_DIR} ]; then
            mkdir -p ${LOG_DIR}
    fi

    if [ ! -d $DATA_DIR ]; then
        mkdir -p $DATA_DIR
    fi

    __pids_var_run "$prog" "$pidfile"
    [ -n "$pid" ] && echo && return

    if [ ! -f $KEY_PATH ]; then
        echo
        echo "  [ERROR] : KEY_PATH is not defined in /etc/kbnd/conf/kbnd.conf"
        exit 1
    fi

    set -f
    OPTIONS="--nodekey ${KEY_PATH}"
    if [[ ! -z $NETWORK_ID ]] && [[ $NETWORK_ID != "" ]]; then
        OPTIONS="$OPTIONS --networkid $NETWORK_ID"
    fi

    if [[ ! -z $METRICS ]] && [[ $METRICS -eq 1 ]]; then
        OPTIONS="$OPTIONS --metrics"
    fi

    if [[ ! -z $PROMETHEUS ]] && [[ $PROMETHEUS -eq 1 ]]; then
        OPTIONS="$OPTIONS --prometheus"
    fi

    if [ ! -z $DATA_DIR ]; then
        OPTIONS="$OPTIONS --datadir $DATA_DIR"
    fi

    if [[ ! -z $AUTHORIZED_NODES ]] && [[ $AUTHORIZED_NODES != "" ]]; then
        OPTIONS="$OPTIONS --authorized-nodes $AUTHORIZED_NODES"
    fi

    if [[ ! -z $ADDITIONAL ]] && [[ $ADDITIONAL != "" ]]; then
        OPTIONS="$OPTIONS $ADDITIONAL"
    fi

    $kbn ${OPTIONS} >> ${LOG_DIR}/kbnd.out 2>&1 &
    RETVAL=$?
    PIDNUM=$!
    set +f
    if [ $RETVAL = 0 ]; then
            echo $PIDNUM > ${pidfile}
            touch ${lockfile}
            success "$prog startup"
    else
            failure "$prog startup"
    fi
    echo
    return $RETVAL
}

stop_node() {
    echo -n "Shutting down $prog: "
    killproc -p ${pidfile} -d ${STOP_TIMEOUT} kbn
    RETVAL=$?
    echo
    [ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}
}

#--------------------- Public functions --------------------------
start() {
    if [ ! -d $LOG_DIR ]; then
        mkdir -p $LOG_DIR
    fi

    if [ ! -z $AUTO_RESTART_NODE ] && [[ $AUTO_RESTART_NODE -eq 1 ]]; then
        start_auto_restart_daemon
    else
        start_node
    fi
}

stop() {
    if [ ! -z $AUTO_RESTART_NODE ] && [[ $AUTO_RESTART_NODE -eq 1 ]]; then
        stop_auto_restart_daemon
    fi
    stop_node
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    status)
        status -p ${pidfile} -l ${lockfile} $kbn
        if [ ! -z $AUTO_RESTART_NODE ] && [[ $AUTO_RESTART_NODE -eq 1 ]]; then
            status_auto_restart_daemon
        fi
        ;;
    restart)
        stop
        sleep 3
        start
        ;;
    *)
        echo "Usage: $prog {start|stop|restart|status}"
        exit 1
        ;;
esac
exit $?