Example init script for Go Service (SystemV)

Go server init script.sh

#!/bin/sh
#
# GO - this script starts and stops the Event server daemon
#
# chkconfig:   345 85 15
# description: GO - server written in golang
# processname: go
# config:      /config/go.json
# pidfile:     /var/run/go.pid

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

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

go="/bin/go-server"
prog=$(basename $go)
pidfile=/var/run/go.pid
GO_USER="flume"
CONF_FILE="/config/go.json"
if [ -f /proc/cpuinfo ]; then
    threads=$(cat /proc/cpuinfo | grep -i 'core id' | wc -l)
elif [ -d /System/Library ]; then
    threads=$(sysctl machdep.cpu.thread_count | cut -f2 -d\ )
else
    threads=8
fi
[[ ${threads} -gt 1 ]]  && threads=$((threads / 5))
[[ ${threads} -ge 1 ]] || threads=1

GOMAXPROCS="${threads:-1}"

[ -f /etc/sysconfig/go ] && . /etc/sysconfig/go

lockfile=/var/lock/subsys/go.events
start() {
    if [ ! -x $go ];then
        failure $"$go has not permissions"
        exit 5
    fi
    if [ ! -e "$CONF_FILE" ];then
        failure $"$CONF_FILE is not exist"
         exit 6
    fi
    echo -n $"Starting $prog: "

    
    runuser -s /bin/bash ${GO_USER} -c "GOMAXPROCS=${GOMAXPROCS:-10} $go -c $CONF_FILE" >/dev/null 2>&1 &
    retval=$?
    _pid=$!  
    if [ $retval -eq 0 ];then
        touch $lockfile
        mkdir -p $(dirname "$pidfile")
        [ "$_pid" != "" ] &&  echo "$_pid" > $pidfile
        success $"$prog startup"
    else
        failure $"exit code $retval"
    fi
        echo
    return $retval
}


stop() {
    echo -n $"Stopping $prog: "
    declare -f checkpid &> /dev/null  && _checkpid_exist="true" ||  _checkpid_exist="false"
    retval=$?
    checkpid $(cat "$pidfile" 2> /dev/null)     
    if [[ $? -eq 0 ]] || [[ "${_checkpid_exist:-false}" = "false" ]];then
        killproc -p $pidfile $go -QUIT
        retval=$?
    fi
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}

restart() {
    configtest || return $?
    stop
    sleep 3
    start
}

force_reload() {
    restart
}

configtest() {    
    RETVAL=1
    echo -n $"Checking $CONF_FILE: "    
    if [[ -e "$CONF_FILE" ]];then
        cat "$CONF_FILE" 2> /dev/null | jq . &> /dev/null   
        RETVAL=$?    
    fi        
    return $RETVAL
}

rh_status() {
    status -p $pidfile $go
}

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