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Full Discussion: using Perl with rrdtool to create and update graphs
Top Forums Shell Programming and Scripting using Perl with rrdtool to create and update graphs Post 302425737 by jeffersno1 on Saturday 29th of May 2010 01:42:56 PM
Old 05-29-2010
using Perl with rrdtool to create and update graphs
Hi guys,

im having real difficulty getting my head around perl and rrdtool and was hoping someone could help

I want to run a perl script from cron which retrieves the data every 5 mins, creates .rrd's if not already created, and updates the DS from the reultsHash or $key, then creates the graphs

Because the OID i use are dynamic i have to snmpwalk a table which is fine.


To obtain the data i use:
Code:
use RRDs;

@get_snmp=`snmptable -v 2c -c public 10.123.123.1:1337 STATS-MIB::statsTable`;

to prove it works i print out the data.

Code:
foreach $key (sort keys %resultsHash) { 
print "$key $resultsHash{$key}\n"; 

output is printed as: 
Pass30d 156 
pass1d 52 
pass7d 388 
freepromd 17

i want to create an .RRD for each pass so im trying to put this into a for loop:

so in princible i should be able to do the following, but the .rrd's dont get created ????
Am i doing something fundamentially wrong here ?

Code:
foreach $key ($key) { 
  
  # if rrdtool database doesn't exist, create it 
LINE 52        if (! -e "$rrd/$key.rrd") 
        { 
                print "creating rrd database for $key ...\n"; 
                RRDs::create "$rrd/$key.rrd", 
                        "-s 300", 
                        "DS:pass:DERIVE:600:U:U", 
                        "RRA:AVERAGE:0.5:1:576", 
                        "RRA:AVERAGE:0.5:6:672", 
                        "RRA:AVERAGE:0.5:24:732", 
                        "RRA:AVERAGE:0.5:144:1460"; 
        }

I would expect the creation of rrd's to have worked. I get the error

Use of uninitialized value in concatenation (.) or string at ./st.pl line 52.

Can anyone advise me on what this means??

Many thanks in advance

Jeffers
Last edited by pludi; 05-30-2010 at 07:51 AM.. Reason: Disabled smiles in code for readability
 

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LEARN ABOUT CENTOS

rrddump

RRDDUMP(1)							      rrdtool								RRDDUMP(1)

NAME

       rrddump - dump the contents of an RRD to XML format

SYNOPSIS

       rrdtool dump filename.rrd [filename.xml] [--header|-h {none,xsd,dtd}] [--no-header] [--daemon address] > filename.xml

DESCRIPTION

       The dump function writes the contents of an RRD in human readable (?) XML format to a file or to stdout. This format can be read by
       rrdrestore. Together they allow you to transfer your files from one computer architecture to another as well to manipulate the contents of
       an RRD file in a somewhat more convenient manner.

       filename.rrd
	       The name of the RRD you want to dump.

       filename.xml
	       The (optional) filename that you want to write the XML output to.  If not specified, the XML will be printed to stdout.

       --header|-h {none,xsd,dtd}
	       By default RRDtool will add a dtd header to the xml file. Here you can customize this to and xsd header or no header at all.

       --no-header
	       A shortcut for --header=none.

	       If you want to restore the dump with RRDtool 1.2 you should use the --no-header option since 1.2 can not deal with xml headers.

       --daemon address
	       Address of the rrdcached daemon. If specified, a "flush" command is sent to the server before reading the RRD files. This allows
	       rrdtool to return fresh data even if the daemon is configured to cache values for a long time.  For a list of accepted formats, see
	       the -l option in the rrdcached manual.

		rrdtool dump --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd

EXAMPLES

       To transfer an RRD between architectures, follow these steps:

       1.  On the same system where the RRD was created, use rrdtool dump to export the data to XML format.

       2.  Transfer the XML dump to the target system.

       3.  Run rrdtool restore to create a new RRD from the XML dump. See rrdrestore for details.

ENVIRONMENT VARIABLES

       The following environment variables may be used to change the behavior of "rrdtool dump":

       RRDCACHED_ADDRESS
	   If this environment variable is set it will have the same effect as specifying the "--daemon" option on the command line. If both are
	   present, the command line argument takes precedence.

AUTHOR

       Tobias Oetiker <tobi@oetiker.ch>

1.4.8								    2013-05-23								RRDDUMP(1)
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