REFERENCE(1)                   mrtg                  REFERENCE(1)



NAME
       reference - MRTG 2.9.18pre7 configuration reference

OVERVIEW
       The runtime behaviour of MRTG is governed by a configura-
       tion file. Run of the mill configuration files can be gen-
       erated with cfgmaker. (Check the cfgmaker manpage). But
       for more elaborate configurations some hand tuning is
       required.

       This document describes all the configuration options
       understud by the mrtg software.

SYNTAX
       MRTG configuration file syntax follows some simple rules:

       o   Keywords must start at the beginning of a line.

       o   Lines which follow a keyword line which do start with
           a blank are appended to the keyword line

       o   Empty Lines are ignored

       o   Lines starting with a # sign are comments.

       o   You can add other files into the configuration file
           using

           Include: file

           Example:

            Include: base-options.inc


GLOBAL PARAMETERS
       WorkDir

       WorkDir specifies where the logfiles and the webpages
       should be created.

       Example:

        WorkDir: /usr/tardis/pub/www/stats/mrtg


OPTIONAL GLOBAL PARAMETERS
       HtmlDir

       HtmlDir specifies the directory where the html (or shtml,
       but we'll get on to those later,) lives.

       NOTE: Workdir overides the settings for htmldir, imagedir
             and logdir

       Example:

        Htmldir: /www/mrtg/





       ImageDir

       ImageDir specifies the directory where the images live,
       they should be under the html directory.

       Example:

        Imagedir: /www/mrtg/images


       LogDir

       LogDir specifies the directory where the logs are stored.
       This need not be under htmldir directive.

       Example:

        Logdir: /www/mrtg/logs


       Forks (UNIX only)

       An a system that can fork (UNIX for example) mrtg can fork
       itself into multiple instances while it is acquiring data
       via snmp.

       For situations with high latency or a great number of
       devices this will speed things up considerably. It will
       not make things faster though if you query a single switch
       sitting next door.

       As far as I know NT can not fork so this option is not
       available on NT.

       Example:

        Forks: 4


       Refresh

       How many seconds apart should the browser (Netscape) be
       instructed to reload the page? If this is not defined, the
       default is 300 seconds (5 minutes).

       Example:

        Refresh: 600


       Interval

       How often do you call mrtg? The default is 5 minutes. If
       you call it less often, you should specify it here. This
       does two things:

       o   the generated HTML page does contain the right infor-
           mation about the calling interval ...

       o   a META header in the generated HTML page will instruct
           caches about the time to live of this page .....

       In this example we tell mrtg that we will be calling it
       every 10 minutes. If you are calling mrtg every 5 minutes,
       you can leave this line commented out.

       Example:

        Interval: 10


       WriteExpires

       With this switch mrtg will generate .meta files for CERN
       and Apache servers which contain Expiration tags for the
       html and gif files. The *.meta files will be created in
       the same directory as the other files, so you will have to
       set "MetaDir ." and "MetaFiles on" in your apache.conf or
       .htaccess file for this to work

       NOTE: If you are running Apache-1.2 or later, you can use
       the mod_expire to achieve the same effect ... see the file
       htaccess.txt

       Example:

        WriteExpires: Yes


       NoMib2

       Normally we ask the SNMP device for 'sysUptime', 'sysName'
       properties some do not have these. If you want to avoid
       getting complaints from mrtg about these missing proper-
       ties, specivy the nomib2 option.

       An example of agents which do not implement base mib2
       attributes are Computer Associates - Unicenter TNG Agents.
       CA relies on using the base OS SNMP agent in addition to
       its own agents to supplement the management of a system.

       Example:

        NoMib2: Yes


       SingleRequest

       Some SNMP implementations can not deal with requests ask-
       ing for multiple snmp variables in one go. Set this in
       your cfg file to force mrtg to only ask for one variable
       per request.

       Examples

        SingleRequest: Yes


       SnmpOptions

       Apart form the per target timeout options, you can also
       configure the behaviour of the snmpget process on a more
       profound level. SnmpOptions accepts a hash of options. The
       following options are currently supported:

        timeout                   => $default_timeout,
        retries                   => $default_retries,
        backoff                   => $default_backoff,
        default_max_repetitions   => $max_repetitions,
        lenient_source_port_matching => 0,
        lenient_source_address_matching => 1

       The values behind the options indicate the current default
       value.  Note that these settings OVERRIDE the per target
       timeout settings.

       Example:

       SnmpOptions: retries => 2, only_ip_address_matching => 0

       Note that AS/400 snmp seems to be broken in a way which
       prevents mrtg from working with it unless

        SnmpOptions: lenient_source_port_matching => 1

       is set.

       IconDir

       If you want to keep the mrtg icons in some place other
       than the working (or imagedir) directory, use the IconDir
       variable for defining the url to the icons directory.

       Example:

        IconDir: /mrtgicons/


       LoadMIBs

       Load the MIB file(s) specified and make its OIDs available
       as symbolic names. For better efficiancy, a cache of MIBs
       is maintained in the WorkDir.

       Example:

        LoadMIBs: /dept/net/mibs/netapp.mib,/usr/local/lib/ft100m.mib


       Language

       Switch output format to the selected Language (Check the
       translate directory to see which languages are supported
       at the moment. In this directory you can also find
       instructions on how to create new translations).

       Currently the following laguages are supported:

       big5 brazilian bulgarian catalan chinese croatian czech
       danish dutch eucjp french galician gb gb2312 german greek
       hungarian icelandic indonesia iso2022jp italian korean
       lithuanian malay norwegian polish portuguese romanian rus-
       sian russian1251 serbian slovak slovenian spanish swedish
       turkish ukrainian

       Example:

        Language: danish


       LogFormat

       Setting LogFormat to 'rrdtool' in your mrtg.cfg file
       enables rrdtool mode.  In rrdtool mode, mrtg relies on
       rrdtool to do its logging. Graphs and html pages will be
       generated on the fly by the 14all.cgi which can be found
       in the contrib section together with a short readme ...
       This feature has been contributed by Rainer Baw-
       idamann <bawidama@users.sourceforge.net>. Please check his
       website for more information: http://www.wh-hms.uni-
       ulm.de/~widi/14all/

       Example:

        LogFormat: rrdtool


       LibAdd

       If you are using rrdtool mode and your rrdtool Perl module
       (RRDs.pm) is not installed in a location where perl can
       find it on its own, you can use LibAdd to supply an appro-
       priate path.

       Example:

        LibAdd: /usr/local/rrdtool/lib/perl/


       PathAdd

       If the rrdtool executable can not be found in the normal
       "PATH", you can use this parameter to add a suitable
       directory to your path.

       Example:

        PathAdd: /usr/local/rrdtool/bin/


       RunAsDaemon

       The RunAsDaemon keyword enables daemon mode operation. The
       purpose of daemon mode is that MRTG is launched once and
       not at regular basis by cron as in native mode. This
       behavior saves computing resourses as loading and parsing
       of configuration files only hapens once.

       Using daemon mode MRTG itself is responible for timing the
       measurement intervals. Therfore its important to set the
       Interval keyword to an apropiate value.

       Note that using daemon mode MRTG should no longer be
       started from cron by regular basis as each started process
       runs forever. Instead MRTG should be started from the com-
       mand prompt or by a system startup script.

       If you want mrtg to run under a particular user and group
       (it is not recomended to run MRTG as root) then you can
       use the --user=user_name and --group=group_name options on
       the mrtg commandline.

        mrtg --user=mrtg_user --group=mrtg_group mrtg.cfg

       Also note that in daemon mode restart of the process is
       required in order to activate changes in the config file.

       Under UNIX, the Daemon switch causes mrtg to fork into
       background after checking its config file. On Windows NT
       the MRTG process will detach from the console, but because
       the NT/2000 shell waits for its children you have to use
       the special start sequence when you launch the program:

        start /b perl mrtg mrtg.cfg

       You may have to add path information equal to what you add
       when you run mrtg from the commandline.

       Example

        RunAsDaemon:Yes
        Interval:5

       Makes MRTG run as a daemon beginning data collection every
       5 minutes

PER TARGET CONFIGURATION
       Each monitoring target must be identified by a unique
       name. This name must be appended to each parameter belong-
       ing to the same target. The name will also be used for
       naming the generated webpages, logfiles and images for
       this target.

       Target

       With the Target keyword you tell mrtg what it should moni-
       tor. The Target keyword takes arguments in a wide range of
       formats:

       Basic
           The most basic format is "port:community@router" This
           will generate a traffic graph for the interface 'port'
           of the host 'router' (dns name or IP address) and it
           will use the community 'community' (snmp password) for
           the snmp query.

           Example:

            Target[ezwf]: 2:public@wellfleet-fddi.ethz.ch

           If your community contains a "@" or a " " these char-
           acters mus be escaped with a "\".

            Target[bla]: 2:stu\ pi\@d@router


       SNMPv2c
           If you have a fast router you might want to try to
           poll the ifHC* counters.  This feature gets activated
           by switching to SNMPv2c. Unfortunately not all devices
           support SNMPv2c yet. If it works, this will prevent
           your counters from wraping within the 5 minute polling
           interval. As we now use 64 bit instead of the normal
           32 bit.

           Example:

            Target[ezwf]: 2:public@router1:::::2


       Reversing
           Sometimes you are sitting on the wrong side of the
           link, and you would like to have mrtg report Incoming
           traffic as outgoing and vice versa. This can be
           achieved by adding the '-' sign in front of the "Tar-
           get" description. It flips the incoming and outgoing
           traffic rates.

           Example:

            Target[ezci]: -1:public@ezci-ether.ethz.ch


       Explicit OIDs
           You can also explicitly define the OID to query by
           using the following syntax 'OID_1&OID_2:commu-
           nity@router' The following example will retrieve error
           counts for input and output on interface 1.  MRTG
           needs to graph two variables, so you need to specify
           two OID's such as temperature and humidity or error
           input and error output.

           Example:

            Target[ezwf]: 1.3.6.1.2.1.2.2.1.14.1&1.3.6.1.2.1.2.2.1.20.1:public@myrouter


       MIB Variables
           MRTG knows a number of symbolical SNMP variable names.
           See the file mibhelp.txt for a list of known names.
           One example are the ifInErrors and ifOutErrors.  This
           means you can specify the above as:

           Example:

            Target[ezwf]: ifInErrors.1&ifOutErrors.1:public@myrouter


       Interface by IP
           Sometimes SNMP interface index can change, like when
           new interfaces are added or removed. This can cause
           all Target entries in your config file to become wrong
           by offset, causing MRTG to graphs wrong instances etc.
           MRTG supports IP address instead of ifindex in target
           definition. Then MRTG will query snmp device and try
           to map IP address to current ifindex, You can use IP
           address in every type of target definition, by adding
           IP address of the numbered interface after OID and
           separation char '/'

           Make sure that given IP address is used on your same
           target router, your same target router, especially
           when graphing two different OIDs and/or interface
           split by '&' delimiter.

           You can tell cfgmaker to generate such references with
           the option --ifref=ip.

           Example:

            Target[ezwf]: /1.2.3.4:public@wellfleet-fddi.ethz.ch
            Target[ezci]: -/1.2.3.4:public@ezci-ether.ethz.ch
            Target[ezwf]: 1.3.6.1.2.1.2.2.1.14/1.2.3.4&1.3.6.1.2.1.2.2.1.14/1.2.3.4:public@myrouter
            Target[ezwf]: ifInErrors/1.2.3.4&ifOutErrors/1.2.3.4:public@myrouter


       Interface by Description
           If you can not use IP addresses you might want to use
           the interface names. This works similar to the IP
           address aproach only that the prefix to use is a \
           instead of a /

           You can tell cfgmaker to generate such references with
           the option --ifref=descr.

           Example:

            Target[ezwf]: \My-Interface2:public@wellfleet-fddi.ethz.ch
            Target[ezci]: -\My-Interface2:public@ezci-ether.ethz.ch
            Target[ezwf]: 1.3.6.1.2.1.2.2.1.14\My-Interface2&1.3.6.1.2.1.2.2.1.14\My-Interface3:public@myrouter
            Target[ezwf]: ifInErrors\My-Interface2&ifOutErrors\My-Interface3:public@myrouter

           If your description contains a "&", a ":", a "@" or a
           " " you can include them but you must escape with a
           backlash:

            Target[ezwf]: \fun\: \ ney\&ddd:public@hello.router


       Interface by Name
           The only sensible way to reference interfaces of your
           switches.

           You can tell cfgmaker to generate such references with
           the option --ifref=name.

           Example:

            Target[ezwf]: #2/11:public@wellfleet-fddi.ethz.ch
            Target[ezci]: -#2/11:public@ezci-ether.ethz.ch
            Target[ezwf]: 1.3.6.1.2.1.2.2.1.14#3/7&1.3.6.1.2.1.2.2.1.14#3/7:public@myrouter
            Target[ezwf]: ifInErrors#3/7&ifOutErrors#3/7:public@myrouter

           If your description contains a "&", a ":", a "@" or a
           " " you can include them but you must escape with a
           backlash:

            Target[ezwf]: #\: \ fun:public@hello.router

           Note that the # sign will be interpreted as a comment
           character if it is the first non white-space character
           on the line.

       Interface by Ethernet Address
           When the SNMP interface index changes, you can key
           that interface by its 'Physical Address', sometimes
           called a 'hard address', which is the SNMP variable
           'ifPhysAddress'.  Internally, MRTG matches the Physi-
           cal Address from the *.cfg file to its current index,
           and then uses that index for the rest of the session.

           You can use the Physical Address in every type of tar-
           get definition, by adding the Physical Address after
           the OID and separation char '!' (analogous to the IP
           address option).  The Physical address is specified as
           '-' delimited octets, such as "0a-0-f1-5-23-18" (omit
           the double quotes). Note that some routers use the
           same Hardware Ethernet Address for all their Interface
           which prevents unique interface identification. Mrtg
           will notice such problems and alert you.

           You can tell cfgmaker to generate configuration files
           with hardware ethernet address references by using the
           option --ifref=eth.

           Example:

            Target[ezwf]: !0a-0b-0c-0d:public@wellfleet-fddi.ethz.ch
            Target[ezci]: -!0-f-bb-05-71-22:public@ezci-ether.ethz.ch
            Target[ezwf]: 1.3.6.1.2.1.2.2.1.14!0a-00-10-23-44-51&!0a-00-10-23-44-51:public@myrouter
            Target[ezwf]: ifInErrors!0a-00-10-23-44-51&ifOutErrors!0a-00-10-23-44-51:public@myrouter


       Interface by Type
           It seems that there are devices that try to defy all
           monitoring efforts, the interesting interfaces have
           neither ifName nor a constant ifDescr not to think of
           a persistant ifIndex. The only way to get a constant
           mapping is by looking at the interface type, because
           the interface you are interested in is unique in the
           device you are looking at ...

           You can tell cfgmaker to generate such references with
           the option --ifref=type.

           Example:

            Target[ezwf]: %13:public@wellfleet-fddi.ethz.ch
            Target[ezci]: -%13:public@ezci-ether.ethz.ch
            Target[ezwf]: 1.3.6.1.2.1.2.2.1.14%13&1.3.6.1.2.1.2.2.1.14%14:public@myrouter
            Target[ezwf]: ifInErrors%13&ifOutErrors%14:public@myrouter


       Extended Host Name Syntax
           In all places where ``community@router'' is accepted,
           you can add additional parameters for the SNMP commu-
           nication using colon-separated suffixes. The full syn-
           tax is as follows:

            community@router[:[port][:[timeout][:[retries][:[backoff][:version]]]]]

           where the meaning of each parameter is as follows:

           port
               the UDP port under which to contact the SNMP agent
               (default: 161)

           timeout
               initial timeout for SNMP queries, in seconds
               (default: 2.0)

           retries
               number of times a timed-out request will be
               retried (default: 5)

           backoff
               factor by which the timeout is multiplied on every
               retry (default: 1.0).

           version
               for SNMP version if you have a fast router you
               might want to put a '2' here. This will make mrtg
               try to poll the 64 bit counters. And thus prevent
               excessive counter wrapping. Not all routers sup-
               port this though.

               Example:

                3:public@router1:::::2


           A value that equals the default value can be omitted.
           Trailing colons can be omitted, too.

           Example:

             Target[ezci]: 1:public@ezci-ether.ethz.ch:9161::4

           This would refer to the input/output octet counters
           for the interface with ifIndex 1 on ezci-
           ether.ethz.ch, as known by the SNMP agent listening on
           UDP port 9161.  The standard initial timeout (2.0 sec-
           onds) is used, but the number of retries is set to
           four.  The backoff value is the default.

       External Monitoring Scripts
           if you want to monitor something which does not pro-
           vide data via snmp you can use some external program
           to do the data gathering.

           The external command must return 4 lines of output:

           Line 1
               current state of the first variable, normally
               'incoming bytes count'

           Line 2
               current state of the second variable, normally
               'outgoing bytes count'

           Line 3
               string (in any human readable format), telling the
               uptime of the target.

           Line 4
               string, telling the name of the target.

           Depending on the type of data your script returns you
           might want to use the 'gauge' or 'absolute' arguments
           for the Options keyword.

           Example:

            Target[ezwf]: `/usr/local/bin/df2mrtg /dev/dsk/c0t2d0s0`

           Note the use of the backticks (`), not apostrophes (')
           around the command.

           If you want to use a backtick in the command  name
           this can be done but you must escape it with a back-
           slash ...

       Multi Target Syntax
           You can also use several statements in a mathematical
           expression.  This could be used to aggregate both B
           channels in an ISDN connection or multiple T1s that
           are aggregated into a single channel for greater band-
           width.  Note the whitespace arround the target defini-
           tions.

           Example:

            Target[ezwf]: 2:public@wellfleetA + 1:public@wellfleetA
                         * 4:public@ciscoF


       RouterUptime

       In cases where you calculate the used bandwidth from sev-
       eral interfaces you normaly don't get the router uptime
       and router name displayed on the web page.

       If these interfaces are on the same router and the uptime
       and name should be displayed nevertheless you have to
       specify its community and address again with the RouterUp-
       time keyword.

       Example:

        Target[kacisco.comp.edu]: 1:public@194.64.66.250 + 2:public@194.64.66.250
        RouterUptime[kacisco.comp.edu]: public@194.64.66.250


       MaxBytes

       The maximum value either of the two variables monitored
       are allowed to reach. For monitoring router traffic this
       is normally specified in bytes per second this interface
       port can carry.

       If a number higher than MaxBytes is returned, it is
       ignored.  Also read the section on AbsMax for further
       info.  The MaxBytes value is also used in calculating the
       Y range for unscaled graphs (see the section on Unscaled).

       Since most links are rated in bits per second, you need to
       divide their maximum bandwidth (in bits) by eight (8) in
       order to get bytes per second.  This is very important to
       make your unscaled graphs display realistic information.
       T1 = 193000, 56K = 7000, Ethernet = 1250000. The MaxBytes
       value will be used by mrtg to decide whether it got a
       valid response from the router.

       If you need two different MaxBytes values for the two mon-
       itored variables, you can use MaxBytes1 and MaxBytes2
       instead of MaxBytes.

       Example:

        MaxBytes[ezwf]: 1250000


       MaxBytes1

       Same as MaxBytes, for variable 1.

       MaxBytes2

       Same as MaxBytes, for variable 2.

       Title

       Title for the HTML page which gets generated for the
       graph.

       Example:

        Title[ezwf]: Traffic Analysis for Our Nice Company


       PageTop

       Things to add to the top of the generated HTML page.  Note
       that you can have several lines of text as long as the
       first column is empty.

       Note that the continuation lines will all end up on the
       same line in the html page. If you want linebreaks in the
       generated html use the '\n' sequence.

       Example:

        PageTop[ezwf]: <H1>Traffic Analysis for ETZ C95.1</H1>
          Our Campus Backbone runs over an FDDI line\n
          with a maximum transfer rate of 12.5 megabytes per
          Second.


OPTIONAL PER TARGET PARAMETERS
       PageFoot

       Things to add to the bottom of the generated HTML page.
       Note that you can have several lines of text as long as
       the first column is empty.

       Note that the continuation lines will all end up on the
       same line in the html page. If you want linebreaks in the
       generated html use the '\n' sequence.

       The material will be added just before the </BODY> tag:

       Example:

        PageFoot[ezwf]: Contact <A HREF="mailto:peter@x.yz">Peter</A>
         if you have questions regarding this page


       AddHead

       Use this tag like the PageTop header, but its contents
       will be added between </TITLE> and </HEAD>.

       Example:

        AddHead[ezwf]: <link rev="made" href="mailto:mrtg@blabla.edu">


       BodyTag

       BodyTag lets you supply your very own <body ...> tag for
       the generated webpages.

       Example:

        BodyTag[ezwf]: <BODY LEFTMARGIN="1" TOPMARGIN="1"
                             BACKGROUND="/stats/images/bg.neo2.gif">


       AbsMax

       If you are monitoring a link which can handle more traffic
       than the MaxBytes value. Eg, a line which uses compression
       or some frame relay link, you can use the AbsMax keyword
       to give the absolute maximum value ever to be reached.  We
       need to know this in order to sort out unrealistic values
       returned by the routers. If you do not set AbsMax, rateup
       will ignore values higher than MaxBytes.

       Example:

        AbsMax[ezwf]: 2500000





       Unscaled

       By default each graph is scaled vertically to make the
       actual data visible even when it is much lower than
       MaxBytes.  With the Unscaled variable you can suppress
       this.  It's argument is a string, containing one letter
       for each graph you don't want to be scaled: d=day w=week
       m=month y=year.  In the example scaling for the yearly and
       the monthly graph are suppressed.

       Example:

        Unscaled[ezwf]: ym


       WithPeak

       By default the graphs only contain the average values of
       the monitored variables - normally the transfer rates for
       incoming and outgoing traffic.  The following option
       instructs mrtg to display the peak 5 minute values in the
       [w]eekly, [m]onthly and [y]early graph. In the example we
       define the monthly and the yearly graph to contain peak as
       well as average values.

       Examples:

        WithPeak[ezwf]: ym


       Suppress

       By default mrtg produces 4 graphs. With this option you
       can suppress the generation of selected graphs.  The
       option value syntax is analogous to the above two options.
       In this example we suppress the yearly graph as it is
       quite empty in the beginning.

       Example:

        Suppress[ezwf]: y


       Extension

       By default, mrtg creates .html files. Use this option to
       tell mrtg to use a different extension. For example you
       could set the extension to php3, then you will be able to
       enclose PHP tags into the output (usefull for getting a
       router name out of a database).

       Example:

        Extension[ezwf]: phtml


       Directory

       By default, mrtg puts all the files that it generates for
       each target (the GIFs, the HTML page, the log file, etc.)
       in WorkDir.

       If the Directory option is specified, the files are
       instead put into a directory under WorkDir or Log-, Image-
       and HtmlDir).  (For example the Directory option below
       would cause all the files for a target ezwf to be put into
       directory /usr/tardis/pub/www/stats/mrtg/ezwf/ .)

       The directory must already exist; mrtg will not create it.

       Example:

        WorkDir: /usr/tardis/pub/www/stats/mrtg
        Directory[ezwf]: ezwf

       NOTE: the Directory option must always be 'relative' or
       bad things will happen.

       XSize and YSize

       By default mrtgs graphs are 100 by 400 pixels wide (plus
       some more for the labels. In the example we get almost
       square graphs ...

       Note: XSize must be between 20 and 600; YSize must be
       larger than 20

       Example:

        XSize[ezwf]: 300
        YSize[ezwf]: 300


       XZoom and YZoom

       If you want your graphs to have larger pixels, you can
       "Zoom" them.

       Example:

        XZoom[ezwf]: 2.0
        YZoom[ezwf]: 2.0


       XScale and YScale

       If you want your graphs to be actually scaled use XScale
       and YScale. (Beware while this works, the results look
       ugly (to be frank) so if someone wants to fix this:
       patches are welcome.

       Example:

        XScale[ezwf]: 1.5
        YScale[ezwf]: 1.5


       YTics and YTicsFactor

       If you want to show more than 4 lines per graph, use
       YTics.  If you want to scale the value used for the YLe-
       gend of these tics, use YTicsFactor.  The default value
       for YTics is 4 and the default value for YTicsFactor is
       1.0 .

       Example:

         Suppose you get values ranging from 0 to 700.
         You want to plot 7 lines and want to show
         0, 1, 2, 3, 4, 5, 6, 7 instead of 0, 100, 200,
         300, 400, 500, 600, 700.  You should write then:

         YTics[ezwf]: 7
         YTicsFactor[ezwf]: 0.01


       Factor

       If you want to multiply all numbers shown below the graph
       with a constant factor, use this directive to define it ..

       Example:

         Factor[as400]: 4096


       Step

       Change the default step from 5 * 60 seconds to something
       else (I have not tested this well ...)

       Example:

        Step[ezwf]: 60


       Options

       The Options Keyword allows you to set some boolean
       switches:

       growright
           The graph grows to the left by default.  This option
           flips the direction of growth causing the current time
           to be at the right edge of the graph and the history
           values to the left of it.

       bits
           All the monitored variable values are multiplied by 8
           (i.e. shown in bits instead of bytes) ... looks much
           more impressive :-) It also affects the 'factory
           default' labeling and units for the given target.

       perminute
           All the monitored variable values are multiplied by 60
           (i.e. shown in units per minute instead of units per
           second) in case of small values more accurate graphs
           are displayed.  It also affects the 'factory default'
           labeling and units for the given target.

       perhour
           All the monitored variable values are multiplied by
           3600 (i.e. shown in units per hour instead of units
           per second) in case of small values more accurate
           graphs are displayed.  It also affects the 'factory
           default' labeling and units for the given target.

       noinfo
           Suppress the information about uptime and device name
           in the generated webpage.

       nopercent
           Don't print usage percentages

       transparent
           make the background of the generated gifs transparent
           ...

       integer
           Print summary lines below graph as integers without
           comma

       dorelpercent
           The relative percentage of IN-traffic to OUT-traffic
           is calculated and displayed in the graph as an addi-
           tional line.  Note: Only a fixed scale is available
           (from 0 to 100%). Therefore for IN-traffic greater
           than OUT-traffic also 100% is displayed.  If you sus-
           pect that your IN-traffic is not always less than or
           equal to your OUT-traffic you are urged to not use
           this options.  Note: If you use this option in combi-
           nation with the Colours options, a fifth colour-name
           colour-value pair is required there.

       avgpeak
           There are some ISPs who use the average Peak values to
           bill their customers.  Using this option MRTG displays
           these values for each graph. The value is built by
           averaging the max 5 minute traffic avarage for each
           'step' shown in the graph. For the Weekly graph this
           means that it builds the average of all 2 hour inter-
           vals 5 minute peak values. (Confused? Though so!)

       gauge
           Treat the values gathered from target as 'current sta-
           tus' measurements and not as ever incrementing coun-
           ters.  This would be useful to monitor things like
           disk space, processor load, temperature, and the like
           ...

           In the absence of 'gauge' or 'absolute' options, MRTG
           treats variable as a counter and calculates the dif-
           ference between the current and the previous value and
           divides that by the elapsed time between the last two
           readings to get the value to be plotted.

       absolute
           This is for counter type data sources which reset
           their value when they are read. This means that rateup
           does not have to build the difference between the cur-
           rent and the last value read from the data source. The
           value obtained is still divided by the elapsed time
           between the current and the last reading, which makes
           it different from the 'gauge' option. Useful for
           external data gatherers.

       unknaszero
           Log unknown data as zero instead of the default
           behaviour of repeating the last value seen. Be careful
           with this, often a flat line in the graph is much more
           obvious than a line at 0.

       withzeroes
           Normally we ignore all values which are zero when cal-
           culating the average transfer rate on a line. If this
           is not desirable use this option.

       noborder
           If you are using rateup to log data, MRTG will create
           the graph images.  Normally these images have a shaded
           border around them. If you do not want the border to
           be drawn, enable this option. This option has no
           effect if you are not using rateup.

       noarrow
           As with the option above, this effects rateup graph
           generation only. Normally rateup will generate graphs
           with a small arrow showing the direction of the data.
           If you do not want this arrow to be drawn, enable this
           option. This option has no effect if you are not using
           rateup.

       noi When using rateup for graph generation, you can use
           this option to stop rateup drawing a graph for the 'I'
           or first variable. This also removes entries for this
           variable in the HTML page MRTG generates, and will
           remove the peaks for this variable if they are
           enabled. This allows you to hide this data, or can be
           very useful if you are only graphing one line of data
           rather than two.  This option is not destructive - any
           data received for the the variable continued to be
           logged, it just isn't shown.

       noo Same as above, except relating to the 'O' or second
           variable.

       nobanner
           When using rateup for graph generation, this option
           disables MRTG adding the MRTG banner to the HTML pages
           it generates.

       nolegend
           When using rateup for graph generation, this option
           will stop MRTG creating a legend at the bottom of the
           HTML pages it generates.

       Example:

        Options[ezwf]: growright, bits


       kilo

       Use this option to change the multiplier value for build-
       ing prefixes. Defaultvalue is 1000. This tag is for the
       special case that 1kB = 1024B, 1MB = 1024kB and so far.

       Example:

        kilo[ezwf]: 1024


       kMG

       Change the default multiplier prefixes (,k,M,G,T,P). In
       the tag ShortLegend define only the basic units.  Format:
       Comma seperated list of prefixed. Two consecutive commas
       or a comma at start or end of the line gives no prefix on
       this item.  Note: If you do not want prefixes, then leave
       this line blank.

       Example: velocity in nm/s (nanometers per second) dis-
       played in nm/h.

        ShortLegend[ezwf]: m/h
        kMG[ezwf]: n,u,m,,k,M,G,T,P
        options[ezwf]: perhour



       Colours

       The Colours tag allows you to override the default colour
       scheme.  Note: All 4 of the required colours must be spec-
       ified here. The colour name ('Colourx' below) is the leg-
       end name displayed, while the RGB value is the real colour
       used for the display, both on the graph and in the html
       doc.

       Format is: Col1#RRGGBB,Col2#RRGGBB,Col3#RRGGBB,Col4#RRGGBB

       Important: If you use the dorelpercent options tag a fifth
       colour name colour value pair is required:
       Col1#RRGGBB,Col2#RRGGBB,Col3#RRGGBB,Col4#RRGGBB,Col5#RRGGBB

       Colour1
           First variable (normally Input) on default graph

       Colour2
           Second variable (normally Output) on default graph

       Colour3
           Max first variable (input)

       Colour4
           Max second variable (output)

       RRGGBB
           2 digit hex values for Red, Green and Blue

       Example:

        Colours[ezwf]: GREEN#00eb0c,BLUE#1000ff,DARK GREEN#006600,VIOLET#ff00ff


       Background

       With the Background tag you can configure the background
       colour of the generated HTML page

       Example:

        Background[ezwf]: #a0a0a0a


       YLegend, ShortLegend, Legend[1234]

       The following keywords allow you to override the text dis-
       played for the various legends of the graph and in the
       HTML document

       YLegend
           The Y-axis label of the graph. Note that a text which
           is too long to fit in the graph will be silently
           ignored.

       ShortLegend
           The units string (default 'b/s') used for Max, Average
           and Current

       Legend[1234IO]
           The strings for the colour legend

       Example:

         YLegend[ezwf]: Bits per Second
         ShortLegend[ezwf]: b/s
         Legend1[ezwf]: Incoming Traffic in Bits per Second
         Legend2[ezwf]: Outgoing Traffic in Bits per Second
         Legend3[ezwf]: Maximal 5 Minute Incoming Traffic
         Legend4[ezwf]: Maximal 5 Minute Outgoing Traffic
         LegendI[ezwf]: &nbsp;In:
         LegendO[ezwf]: &nbsp;Out:

       Note, if LegendI or LegendO are set to an empty string
       with

        LegendO[ezwf]:

       The corresponding line below the graph will not be printed
       at all.

       Timezone

       If you live in an international world, you might want to
       generate the graphs in different timezones. This is set in
       the TZ variable. Under certain operating systems like
       Solaris, this will provoke the localtime call to give the
       time in the selected timezone ...

       Example:

        Timezone[ezwf]: Japan

       The Timezone is the standard Solaris timezone, ie Japan,
       Hongkong, GMT, GMT+1 etc etc.

       Weekformat

       By default, mrtg (actually rateup) uses the strftime(3)
       '%W' option to format week numbers in the monthly graphs.
       The exact semantics of this format option vary between
       systems.  If you find that the week numbers are wrong, and
       your system's strftime(3) routine supports it, you can try
       another format option.  The POSIX '%V' option seems to
       correspond to a widely used week numbering convention.
       The week format character should be specified as a single
       letter; either W, V, or U.

       Example:

        Weekformat[ezwf]: V


       SetEnv

       When calling external scrits from withing your cfg file
       (Threshold or script targets) you might want to pass some
       data on to the script. This can be done with the SetEnv
       configuration option ... it takes a series of environment
       variable assignments. Note that the quotes are mandatory.

       Example:

        SetEnv[myrouter]:  EMAIL="contact_email@someplace.net"
                           HOST="www.some_server.net"
                           URL="http://www.some_server.net/path/mrtg.html"


THRESHOLD CHECKING
       Through its threshold checking functionality mrtg is able
       to detect threshold problems for the various targets and
       can call external scripts to handle those problems (send
       email or a page to an administrator).

       Threshold checking is configured through the following
       parameters:

       ThreshDir (GLOBAL)

       By defining ThreshDir to point to a writable directory,
       MRTG will only alert you when a threshold boundery has
       been crossed.

       Example:

        ThreshDir: /var/mrtg/thresh


       ThreshMinI  (PER TARGET)

       This is the minimum acceptable value for the Input (first)
       parameter.  If the parameter falls below this value, the
       program specified in ThreshProgI will be run. If the value
       ends in '%' then the threshold is defined relative to
       MaxBytes.

       ThreshMaxI (PER TARGET)

       This is the maximum acceptable value for the Input (first)
       parameter.  If the parameter falls above this value, the
       program specified in ThreshProgI will be run. If the value
       ends in '%' then the threshold is defined relative to
       MaxBytes.

       ThreshDesc (PER TARGET)

       Its value will be assigned to the environment variable
       THRESH_DESC before any of the programs mentioned below are
       called. The programms can use the value of this variable
       to produce more userfriendly output.

       ThreshProgI  (PER TARGET)

       This defines a program to be run if ThreshMinI or Thresh-
       MaxI is broken.  MRTG passes 3 arguments: the $router
       variable, the threshold value broken, and the current
       parameter value.

       ThreshProgOKI  (PER TARGET)

       This defines a program to be run if the parameter is cur-
       rently OK (based on ThreshMinI and ThreshMaxI), but wasn't
       OK on the previous running -- based on the files found in
       ThreshDir. MRTG passes 3 arguments: the $router variable
       the un-broken threshold value, and the current parameter
       value.

       ThreshMinO, ThreshMaxO, ThreshProgO, and ThreshProgOKO

       They work the same as their *I counterparts, except on the
       Output (second) parameter.

       Note, that you can use the SetEnv parameter explained
       above to pass additional information to the threshold pro-
       grams.

PER TARGET DEFAULT VALUES
       Pre- and Postfix

       To save yourself some typing you can define a target
       called '^'. The text of every Keyword you define for this
       target will be PREPENDED to the corresponding Keyword of
       all the targets defined below this line. The same goes for
       a Target called '$' but its text will be APPENDED.

       Note that a space is inserted between the prepended text
       and the Keyword value, as well as between the Keyword
       value and the appended text. This works well for text-val-
       ued Keywords, but is not very useful for other Keywords.
       See the "default" target description below.

       The example will make mrtg use a common header and a com-
       mon contact person in all the pages generated from targets
       defined later in this file.

       Example:

        PageTop[^]: <H1>NoWhere Unis Traffic Stats</H1><HR>
        PageTop[$]: Contact Peter Norton if you have any questions<HR>

       To remove the prepend/append value, specify an empty
       value, e.g.:

        PageTop[^]:
        PageTop[$]:

       NOTE: With PREPEND and APPEND there is normally a space
       inserted between the local value and the PRE- or APPEND
       value. Sometimes this is not desirable. You can use the
       NoSpaceChar config option to define a character which can
       be mentioned at the end of a $ or ^ definition in order to
       supress the space.

       Example:

         NoSpaceChar: ~
         Target[^]: 1.3.6.1.4.1.482.50.2.4.20.0&1.3.6.1.4.1.482.50.2.4.21.0:get@~
         Target[a]: a.tolna.net
         Target[b]: b.tolna.net
         Target[c]: c.tolna.net
         Target[d]: d.tolna.net


       Default Values

       The target name '_' specifies a default value for that
       Keyword. In the absence of explicit Keyword value, the
       prepended and the appended keyword value, the default
       value will be used.

       Example:

        YSize[_]: 150
        Options[_]: growright,bits,nopercent
        WithPeak[_]: ymw
        Suppress[_]: y
        MaxBytes[_]: 1250000

       To remove the default value and return to the 'factory
       default', specify an empty value, e.g.:

        YLegend[_]:

       There can be several instances of setting the
       default/prepend/append values in the configuration file.
       The later setting replaces the previous one for the rest
       of the configuration file.  The default/prepend/append
       values used for a given keyword/target pair are the ones
       that were in effect at the point in the configuration file
       where the target was mentioned for the first time.

       Example:

        MaxBytes[_]: 1250000
        Target[myrouter.somplace.edu.2]: 2:public@myrouter.somplace.edu
        MaxBytes[_]: 8000
        Title[myrouter.somplace.edu.2]: Traffic Analysis for myrouter.somplace.edu IF 2

       The default MaxBytes for the target myrouter.som-
       place.edu.2 in the above example will be 1250000, which
       was in effect where the target name myrouter.som-
       place.edu.2 first appeared in the config file.

COMMAND LINE OPTIONS
       --user username  and --group groupname
           Run as the given user and/or group. (Unix Only)

       --lock-file filename
           Use an alternate lock-file (the default is to use the
           configuration-file appended with "_l").

       --confcache-file filename
           Use an alternate confcache-file (the default is to use
           the configuration-file appended with ".ok")

       --logging filename|eventlog
           If this is set to writable filename, all output from
           mrtg (warnings, debug messages, errors) will go to
           filename. If you are running on Win32 you can specify
           eventlog instead of a filename which will send all
           error to the windows event log.

           NOTE:Note, there is no Message DLL for mrtg which has
           the side effect that the windows event logger will
           display a nice message with every entry in the event
           log, complaing about the fact that mrtg has no message
           dll. If any of the Windows folks want to contribute
           one, they are welcome.

EXAMPLES
       Minimal mrtg.cfg

        WorkDir: /usr/tardis/pub/www/stats/mrtg
        Target[r1]: 2:public@myrouter.somplace.edu
        MaxBytes[r1]: 8000
        Title[r1]: Traffic Analysis ISDN
        PageTop[r1]: <H1>Stats for our ISDN Line</H1>


       Cfg for several Routers.

        WorkDir: /usr/tardis/pub/www/stats/mrtg
        Title[^]: Traffic Analysis for
        PageTop[^]: <H1>Stats for
        PageTop[$]: Contact The Chief if you notice anybody<HR>
        MaxBytes[_]: 8000
        Options[_]: growright

        Title[isdn]: our ISDN Line
        PageTop[isdn]: our ISDN Line</H1>
        Target[isdn]: 2:public@router.somplace.edu

        Title[backb]: our Campus Backbone
        PageTop[backb]: our Campus Backbone</H1>
        Target[backb]: 1:public@router.somplace.edu
        MaxBytes[backb]: 1250000

        # the following line removes the default prepend value
        # defined above

        Title[^]:

        Title[isdn2]: Traffic for the Backup ISDN Line
        PageTop[isdn2]: our ISDN Line</H1>
        Target[isdn2]: 3:public@router.somplace.edu


AUTHOR
       Tobias Oetiker <oetiker@ee.ethz.ch> and many contributors



2002-04-15                  2.9.18pre7               REFERENCE(1)
