Log::Log4perl::Appender::RRDs - Log to a RRDtool Archive
use Log::Log4perl qw(get_logger); use RRDs; my $DB = "myrrddb.dat"; RRDs::create( $DB, "--step=1", "DS:myvalue:GAUGE:2:U:U", "RRA:MAX:0.5:1:120"); print time(), "\n"; Log::Log4perl->init(\qq{ log4perl.category = INFO, RRDapp log4perl.appender.RRDapp = Log::Log4perl::Appender::RRDs log4perl.appender.RRDapp.dbname = $DB log4perl.appender.RRDapp.layout = Log::Log4perl::Layout::PatternLayout log4perl.appender.RRDapp.layout.ConversionPattern = N:%m }); my $logger = get_logger(); for(10, 15, 20, 25) { $logger->info($_); sleep 1; }
Log::Log4perl::Appender::RRDs appenders facilitate writing data to RRDtool round-robin archives via Log4perl. For documentation on RRD and its Perl interface RRDs (which comes with the distribution), check out http://rrdtool.org.
Log::Log4perl::Appender::RRDs
RRDs
Messages sent to Log4perl's RRDs appender are expected to be numerical values (ints or floats), which then are used to run a rrdtool update command on an existing round-robin database. The name of this database needs to be set in the appender's dbname configuration parameter.
rrdtool update
dbname
If there's more parameters you wish to pass to the update method, use the rrdupd_params configuration parameter:
update
rrdupd_params
log4perl.appender.RRDapp.rrdupd_params = --template=in:out
To read out the round robin database later on, use rrdtool fetch or rrdtool graph for graphic displays.
rrdtool fetch
rrdtool graph
Mike Schilli <log4perl@perlmeister.com>, 2004
To install Log::Log4perl, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Log::Log4perl
CPAN shell
perl -MCPAN -e shell install Log::Log4perl
For more information on module installation, please visit the detailed CPAN module installation guide.