Log4perl configuration is not working - linux

Question

I have Log4perl installed on my Linux machine and have the following /path/to/log4perl.conf:
log4perl.logger.Fizz = INFO, FizzAppender
log4perl.logger.Buzz = INFO, BuzzAppender
log4perl.appender.FizzAppender = Log::Dispatch::FileRotate
log4perl.appender.FizzAppender.filename = /my/logs/fizz-log.txt
log4perl.appender.FizzAppender.max = 1
log4perl.appender.FizzAppender.DatePattern = yyyy-MM-dd
log4perl.appender.FizzAppender.TZ = EST
log4perl.appender.FizzAppender.layout = Log::Log4perl::Layout::PatternLayout
log4perl.appender.FizzAppender.layout.ConversionPattern = %d %m %n
log4perl.appender.BuzzAppender = Log::Dispatch::FileRotate
log4perl.appender.BuzzAppender.filename = /my/logs/buzz-log.txt
log4perl.appender.BuzzAppender.max = 1
log4perl.appender.BuzzAppender.DatePattern = yyyy-MM-dd
log4perl.appender.BuzzAppender.TZ = EST
log4perl.appender.BuzzAppender.layout = Log::Log4perl::Layout::PatternLayout
log4perl.appender.BuzzAppender.layout.ConversionPattern = %d %m %n
Inside each of my perl scripts (each script uses a different appender and a logs to a different log file):
use Log::Log4perl;
my $log_conf = "/path/to/log4perl.conf";
Log::Log4perl::init($log_conf);
# In one script the logger is a "Fizz" logger (like below), and in the other
# script the logger is a "Buzz" logger.
my $logger = Log::Log4perl->get_logger("Fizz");
$logger->info("This should work.");
Even though each script uses a different appender and logs to a different file, they should all have the same behavior:
Each log gets rotated once a day, and old (rotated) logs gets deleted
I've had this script running for more than 24 hours now, and I don't see any logs being generated under /my/logs/.
So I ask: is my log4perl.conf incorrect? If not, what can I do to diagnose the issue? Am I initializing the library incorrectly in the perl scripts? Thanks in advance.

Answer 1

I think you need to add the parameter mode to your log4perl.conf file:
log4perl.appender.FizzAppender.mode = truncate
log4perl.appender.BuzzAppender.mode = truncate
To speed things along I've changed your DatePattern to the following:
log4perl.appender.FizzAppender.DatePattern = yyyy-MM-dd-HH-MM
log4perl.appender.BuzzAppender.DatePattern = yyyy-MM-dd-HH-MM
Here's a test using your log4perl.conf file. I've created 2 copies of your Perl script:
log4perl_Buzz.pl
log4perl_Fizz.pl
I've added a loop within the scripts so that every second they log a message to their respective log files:
while (1) {
$logger->info("This should work.");
sleep 1;
}
I run them both at the same time and see the following results using a watch ls -l:
Every 2.0s: ls -l Thu Dec 20 21:16:51 2012
total 12
-rwxrwxr-x 1 saml saml 358 Dec 20 20:15 log4perl_Buzz.pl
-rw-rw-r-- 1 saml saml 978 Dec 20 21:07 log4perl.conf
-rwxrwxr-x 1 saml saml 358 Dec 20 20:15 log4perl_Fizz.pl
After I run the 2 scripts:
Every 2.0s: ls -l Thu Dec 20 21:17:56 2012
total 20
-rw-rw-r-- 1 saml saml 39 Dec 20 21:17 buzz-log.txt
-rw-rw-r-- 1 saml saml 39 Dec 20 21:17 fizz-log.txt
-rwxrwxr-x 1 saml saml 358 Dec 20 20:15 log4perl_Buzz.pl
-rw-rw-r-- 1 saml saml 978 Dec 20 21:07 log4perl.conf
-rwxrwxr-x 1 saml saml 358 Dec 20 20:15 log4perl_Fizz.pl
After ~2 minutes pass:
Every 2.0s: ls -l Thu Dec 20 21:19:05 2012
total 28
-rw-rw-r-- 1 saml saml 195 Dec 20 21:19 buzz-log.txt
-rw-rw-r-- 1 saml saml 2340 Dec 20 21:18 buzz-log.txt.1
-rw-rw-r-- 1 saml saml 234 Dec 20 21:19 fizz-log.txt
-rw-rw-r-- 1 saml saml 2301 Dec 20 21:18 fizz-log.txt.1
-rwxrwxr-x 1 saml saml 358 Dec 20 20:15 log4perl_Buzz.pl
-rw-rw-r-- 1 saml saml 978 Dec 20 21:07 log4perl.conf
-rwxrwxr-x 1 saml saml 358 Dec 20 20:15 log4perl_Fizz.pl
Here's my version of log4perl.conf for those that are playing at home 8-).
log4perl.logger.Fizz = INFO, FizzAppender
log4perl.logger.Buzz = INFO, BuzzAppender
log4perl.appender.FizzAppender = Log::Dispatch::FileRotate
log4perl.appender.FizzAppender.filename = fizz-log.txt
log4perl.appender.FizzAppender.max = 1
log4perl.appender.FizzAppender.DatePattern = yyyy-MM-dd-HH-MM
log4perl.appender.FizzAppender.TZ = EST
log4perl.appender.FizzAppender.layout = Log::Log4perl::Layout::PatternLayout
log4perl.appender.FizzAppender.layout.ConversionPattern = %d %m %n
log4perl.appender.FizzAppender.mode = truncate
log4perl.appender.BuzzAppender = Log::Dispatch::FileRotate
log4perl.appender.BuzzAppender.filename = buzz-log.txt
log4perl.appender.BuzzAppender.max = 1
log4perl.appender.BuzzAppender.DatePattern = yyyy-MM-dd-HH-MM
log4perl.appender.BuzzAppender.TZ = EST
log4perl.appender.BuzzAppender.layout = Log::Log4perl::Layout::PatternLayout
log4perl.appender.BuzzAppender.layout.ConversionPattern = %d %m %n
log4perl.appender.BuzzAppender.mode = truncate
These were useful resources in figuring this out:
Log::Dispatch::FileRotate on CPAN
log4perl FAQ
Limiting log size with log4perl - stackoverflow