Ich nutze zur Serverüberwachung diverse Tools. Darunter ist auch mrtg, dass mir in meiner Konfiguration etwas über die Netzauslastung anzeigt. Leider kommt mrtg nicht mit einem passenden init-Script daher, so dass ich mir ein eigenes schreiben musste.

Neben der Konfiguration von mrtg benötigt man eine Konfigurationsdatei für das init-Script. Dort hinterlegt man die entsprechende mrtg-Konfiguration, lässt aber die Erweiterung „.cfg“ weg (kann natürlich auch eine andere sein, aber dann muss das Script auch noch angepasst werden).

/etc/sysconfig/mrtg

# Pfad zur Konfiguration (ohne .cfg)
MRTG_CONFIG="/etc/mrtg/foo"

Das Script reiht sich nach Apache, Netzwerk und syslog in die Startreihenfolge ein. Der Dienst time sollte gestartet werden, um die Daten in der RRD auch konsistent zu halten.

/etc/init.d/mrtg

#!/bin/sh                      
### BEGIN INIT INFO            
# Provides:          mrtg      
# Required-Start:    $syslog $network $apache
# Should-Start:      $time                   
# Required-Stop:                             
# Should-Stop:                               
# Default-Start:     3 5                     
# Default-Stop:      0 1 2 6                 
# Short-Description: mrtg daemon providing server statistics
# Description:       Start mrtg to monitoring your server
### END INIT INFO                                             
 
# Read config
. /etc/sysconfig/mrtg
 
# Check for existence of needed config file and read it
test -r "$MRTG_CONFIG.cfg" || { echo "$MRTG_CONFIG.cfg not existing";
        if [ "$1" = "stop" ]; then exit 0;                           
        else exit 6; fi; }                                           
 
# Check for missing binaries (stale symlinks should not happen)
# Note: Special treatment of stop for LSB conformance          
MRTG_BIN=/usr/bin/mrtg                                         
test -x $MRTG_BIN || { echo "$MRTG_BIN not installed";         
        if [ "$1" = "stop" ]; then exit 0;                     
        else exit 5; fi; }                                     
 
export LANG=C
MRTG="$MRTG_BIN --daemon $MRTG_CONFIG.cfg"
 
. /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.                                          
 
case "$1" in
    start)  
        echo -n "Starting mrtg "
        $MRTG 2>&1 1>/dev/null  
 
        # Remember status and be verbose
        rc_status -v                    
        ;;                              
    stop)                               
        echo -n "Shutting down mrtg "   
 
        /bin/kill `cat $MRTG_CONFIG.pid`
 
        # Remember status and be verbose
        rc_status -v                    
        ;;                              
    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
        ;;
    force-reload)
        ## Signal the daemon to reload its config. Most daemons
        ## do this on signal 1 (SIGHUP).
        ## If it does not support it, restart the service if it
        ## is running.
 
        echo -n "Reload service mrtg "
        ## if it supports it:
        /sbin/killproc -HUP $MRTG_BIN
        #touch /var/run/mrtg.pid
        rc_status -v
 
        ## Otherwise:
        #$0 try-restart
        #rc_status
        ;;
    reload)
        ## Like force-reload, but if daemon does not support
        ## signaling, do nothing (!)
 
        # If it supports signaling:
        echo -n "Reload service mrtg "
        /sbin/killproc -HUP $MRTG_BIN
        #touch /var/run/mrtg.pid
        rc_status -v
 
        ## Otherwise if it does not support reload:
        #rc_failed 3
        #rc_status -v
        ;;
    status)
        echo -n "Checking for service mrtg "
        ## Check status with checkproc(8), if process is running
        ## checkproc will return with exit status 0.
 
        # Return value is slightly different for the status command:
        # 0 - service up and running
        # 1 - service dead, but /var/run/  pid  file exists
        # 2 - service dead, but /var/lock/ lock file exists
        # 3 - service not running (unused)
        # 4 - service status unknown :-(
        # 5--199 reserved (5--99 LSB, 100--149 distro, 150--199 appl.)
 
        # NOTE: checkproc returns LSB compliant status values.
        /sbin/checkproc $MRTG_BIN
        # NOTE: rc_status knows that we called this init script with
        # "status" option and adapts its messages accordingly.
        rc_status -v
        ;;
    *)
        echo "Usage: $0 {start|stop|status|restart|force-reload|reload}"
        exit 1
        ;;
esac
rc_exit