How to create an error log file?

tsam has asked for the wisdom of the Perl Monks concerning the following question:

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Re: How to create an error log file? by tlm (Prior) on Apr 07, 2005 at 09:47 UTC
This is what I use: `BEGIN { require 5.004; use CGI::Carp qw(fatalsToBrowser carpout); my $logfile = 'path/to/logfile'; open LOG, ">>$logfile" or die "Couldn't append to $logfile: $!\n"; carpout(\*LOG); };` [download] This appends to the logfile all the output sent to STDERR, both during compile-time and during run-time. E.g., if I have the line `warn "Logging...\n";` [download] in my code, this will send the following to the logfile: `[Thu Apr 7 05:39:57 2005] testcgi: Logging...` [download] the lowliest monk	[reply] [d/l] [select]
Re^2: How to create an error log file? by tsam (Novice) on Apr 07, 2005 at 10:18 UTC
Hi Pustular, The code works nicely....thanx a lot:)	[reply]
Re: How to create an error log file? by rev_1318 (Chaplain) on Apr 07, 2005 at 09:35 UTC
Have you checked the logfile of your web server? Paul	[reply]
Re^2: How to create an error log file? by tsam (Novice) on Apr 07, 2005 at 09:48 UTC
Hi Paul, Actually I am quite a newbie and I am not sure how to check that...	[reply]
Re^3: How to create an error log file? by Jaap (Curate) on Apr 07, 2005 at 09:56 UTC
Ask your sysadmin the location of the webserver logfiles. It might be in your homedir somewhere. The filename is usually something like `error_log` so if you run `find ~ -name error_log` on a unix/linux box, it might find the file for you.	[reply] [d/l] [select]
Re: How to create an error log file? by reasonablekeith (Deacon) on Apr 07, 2005 at 09:47 UTC
Also, info on catching DBI errors from the DBI documentation. The important thing to note being that you can die in an eval block, but your perl script won't die. `perldoc -m DBI perldoc -f eval` [download] Typically RaiseError is used in conjunction with eval { ... } to catch the exception that's been thrown and followed by an if ($@) { ... } block to handle the caught exception. For example: `eval { ... $sth->execute(); ... }; if ($@) { # $sth->err and $DBI::err will be true if error was from DBI warn $@; # print the error ... # do whatever you need to deal with the error }` [download]	[reply] [d/l] [select]
Re: How to create an error log file? by chimni (Pilgrim) on Apr 07, 2005 at 09:36 UTC
You can have a look at the Log4perl module. The documentation is quite good .Simple to implement regards, chimni	[reply]
Re: How to create an error log file? by loris (Hermit) on Apr 07, 2005 at 13:07 UTC
Like chimni, I would also go for Log::Log4perl. I have found it extremely useful and easy to use. I wouldn't think of writing any moderately-sized program without it. loris	[reply]
Re: How to create an error log file? by pearlie (Sexton) on Apr 07, 2005 at 11:42 UTC
Hello, On linux, the apache error log is found in dir /var/log/httpd/. Also, log::log4perl gives great flexibility to trap all errors that you want and put them in a customized format in a log file.	[reply]
Re^2: How to create an error log file? by Miguel (Friar) on Apr 07, 2005 at 12:08 UTC
On linux, the apache error log is found in dir /var/log/httpd/. I'm using Linux (Slackware) and the (main) error log is in /var/log/apache2/error_log. The sysadmin can put that directory where ever he/she wants. On the other hand, foreach site I always create a dedicated /logs dir under the site directory (not a public directory). This way I don't fill up the main error_log and makes it easier to follow errors on the web site I'm currently working. I do this when I configure a new site on Apache: `<VirtualHost ....> ...... ErrorLog /path/to/website/error_log .... </VirtualHost>` [download]	[reply] [d/l]