mongod init.d script for SLES

sles11-mongod.init

#!/bin/sh
#
# /etc/init.d/mongod
#
# Modified from: https://build.opensuse.org/package/view_file?file=mongod.init&package=mongodb&project=home:phprus:server:database&srcmd5=94d608ffe3ba91c10261c49ba16f3db1
#
### BEGIN INIT INFO
# Provides:          mongod
# Required-Start: $syslog $local_fs $network  
# Required-Stop:  $syslog $local_fs $network  
# Should-Start:   $remote_fs
# Should-Stop:    $remote_fs
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Short-Description: MongoDB server
# Description:       Starts and stops the MongoDB daemon
### END INIT INFO


# Check for missing binaries (stale symlinks should not happen)
# Note: Special treatment of stop for LSB conformance

MONGOD_BIN="/usr/local/bin/mongod"
MONGOD_LOGFILE="/var/mongo/log/mongod.log"
MONGOD_PIDFILE="/var/mongo/run/mongod.pid"
MONGOD_CONFIG="/etc/sysconfig/mongod"

MONGOD_USER=mongod
MONGOD_GROUP=mongod

test -x $MONGOD_BIN || { echo "$MONGOD_BIN not installed"; 
        if [ "$1" = "stop" ]; then exit 0;
        else exit 5; fi; }

# Check for existence of needed config file and read it
# test -r $MONGOD_CONFIG || { echo "$MONGOD_CONFIG not existing";
#         if [ "$1" = "stop" ]; then exit 0;
#         else exit 6; fi; }
# Read config
# . $MONGOD_CONFIG

# Read config
[ -e $MONGOD_CONFIG ] && . $MONGOD_CONFIG


# Source LSB init functions
# providing start_daemon, killproc, pidofproc, 
# log_success_msg, log_failure_msg and log_warning_msg.
# This is currently not used by UnitedLinux based distributions and
# not needed for init scripts for UnitedLinux only. If it is used,
# the functions from rc.status should not be sourced or used.
#. /lib/lsb/init-functions

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     be verbose in local rc status and clear it afterwards
#      rc_status -v -r  ditto and clear both the local and overall rc status
#      rc_status -s     display "skipped" and exit with status 3
#      rc_status -u     display "unused" and exit with status 3
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num>
#      rc_reset         clear both the local and overall rc status
#      rc_exit          exit appropriate to overall rc status
#      rc_active        checks whether a service is activated by symlinks
. /etc/rc.status

# Reset status of this service
rc_reset

# Return values acc. to LSB for all commands but status:
# 0          - success
# 1       - generic or unspecified error
# 2       - invalid or excess argument(s)
# 3       - unimplemented feature (e.g. "reload")
# 4       - user had insufficient privileges
# 5       - program is not installed
# 6       - program is not configured
# 7       - program is not running
# 8--199  - reserved (8--99 LSB, 100--149 distrib, 150--199 appl)
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signaling is not supported) are
# considered a success.

# Set ulimit setting
# ulimit -n 10240
ulimit -n 12000

case "$1" in
    start)
        echo -n "Starting service MongoDB "
        ## Start daemon with startproc(8). If this fails
        ## the return value is set appropriately by startproc.
        /sbin/startproc -u $MONGOD_USER -g $MONGOD_GROUP -s -e $MONGOD_BIN --config /etc/mongod.conf run
        # Remember status and be verbose
        rc_status -v
        ;;
    stop)
        echo -n "Stopping service MongoDB "
#        killproc -p /var/mongo/db/mongod.lock -t30 -TERM /usr/local/bin/mongod
        /sbin/killproc -TERM $MONGOD_BIN
        rc_status -v
        ;;
    try-restart|condrestart)
        ## Do a restart only if the service was active before.
        ## Note: try-restart is now part of LSB (as of 1.9).
        ## RH has a similar command named condrestart.
        if test "$1" = "condrestart"; then
            echo "${attn} Use try-restart ${done}(LSB)${attn} rather than condrestart ${warn}(RH)${norm}"
        fi
        $0 status
        if test $? = 0; then
            $0 restart
        else
            rc_reset        # Not running is not a failure.
        fi
        # Remember status and be quiet
        rc_status
        ;;
    restart)
        ## Stop the service and regardless of whether it was
        ## running or not, start it again.
        $0 stop
        $0 start

        # Remember status and be quiet
        rc_status
        ;;
    reload)
        $0 restart
        ;;
    status)
        echo -n "Checking for service MongoDB: "
        /sbin/checkproc -p $MONGOD_PIDFILE $MONGOD_BIN
        rc_status -v
        ;;
    *)
        echo "Usage: $0 {start|stop|status|try-restart|restart|reload}"
        exit 1
        ;;
esac
rc_exit

please explain line /sbin/startproc -u $MONGOD_USER -g $MONGOD_GROUP -s -e $MONGOD_BIN --config /etc/mongod.conf run