Help -- how to fork an Apache process in mod_perl safely? Not Apache2:Subprocess...
Hi all,
I need to be able to fork an Apache process in daemon form, to do some
housekeeping which might potentially take a few seconds. However, when I
do that, I start getting SQL errors (of the connection lost type) in
the browser. I do the fairly standard cleanup to daemonize the child
process, but of course it needs to retain the SQL socket open. Here is
my forking code:
sub modperl_kamikaze_fork () {
# You will have to do CORE::exit(0) at the end of the execution.
$SIG{CHLD} = 'IGNORE';
get_m-flush_buffer;
defined (my $kid = fork) or die Cannot fork: $!\n;
return $kid if $kid;
my $r = get_r;
close STDIN; open STDIN, '/dev/null'
or die Can't read /dev/null: $!;
close STDOUT; open STDOUT, '/dev/null'
or die Can't write to /dev/null: $!;
close STDERR; open STDERR, '/tmp/form.log'
or die Cannot open /tmp/fork.log\n;
setsid
or die Can't start a new session: $!;
my $oldfh = select STDERR;
local $| = 1;
select $oldfh;
warn Child (PID $$) spawned.\n;
$r-child_terminate;
}
The Apache2:Subprocess doesn't help me, because I need not to spawn an
external process, but to finish processing in mod_perl context -- just
without bugging the user with it.
Any ideas on how to either fork better, or how to solve this without
forking (e.g. is there a way to 'append' a function call to the request
after the rest of the request is completed)?
Many thanks in advance.
--
Victor Danilchenko
Senior Software Engineer, AskOnline.net
vic...@askonline.net - 617-273-0119
Re: Help -- how to fork an Apache process in mod_perl safely? Not Apache2:Subprocess...
On Tue, Aug 25, 2009 at 8:11 AM, Victor Danilchenkovic...@askonline.net wrote: I need to be able to fork an Apache process in daemon form, to do some housekeeping which might potentially take a few seconds. However, when I do that, I start getting SQL errors (of the connection lost type) in the browser. I do the fairly standard cleanup to daemonize the child process, but of course it needs to retain the SQL socket open. You can't fork and keep using a database connection. You have to open a new connection in the forked process. The Apache2:Subprocess doesn't help me, because I need not to spawn an external process, but to finish processing in mod_perl context -- just without bugging the user with it. In that case, just use a cleanup handler instead. - Perrin
Re: Help -- how to fork an Apache process in mod_perl safely? Not Apache2:Subprocess...
my solution is here:
sub fork_temporary_child {
my $result = fork();
unless( $result ) {
# Do not use SQL in child
dbh-{InactiveDestroy} = 1;
disconnect_dbh;
}
return $result;
}
On Tue, Aug 25, 2009 at 7:11 AM, Victor Danilchenko vic...@askonline.netwrote:
Hi all,
I need to be able to fork an Apache process in daemon form, to do
some housekeeping which might potentially take a few seconds. However, when
I do that, I start getting SQL errors (of the connection lost type) in the
browser. I do the fairly standard cleanup to daemonize the child process,
but of course it needs to retain the SQL socket open. Here is my forking
code:
sub modperl_kamikaze_fork () {
# You will have to do CORE::exit(0) at the end of the execution.
$SIG{CHLD} = 'IGNORE';
get_m-flush_buffer;
defined (my $kid = fork) or die Cannot fork: $!\n;
return $kid if $kid;
my $r = get_r;
close STDIN; open STDIN, '/dev/null'
or die Can't read /dev/null: $!;
close STDOUT; open STDOUT, '/dev/null'
or die Can't write to /dev/null: $!;
close STDERR; open STDERR, '/tmp/form.log'
or die Cannot open /tmp/fork.log\n;
setsid
or die Can't start a new session: $!;
my $oldfh = select STDERR;
local $| = 1;
select $oldfh;
warn Child (PID $$) spawned.\n;
$r-child_terminate;
}
The Apache2:Subprocess doesn't help me, because I need not to spawn
an external process, but to finish processing in mod_perl context -- just
without bugging the user with it.
Any ideas on how to either fork better, or how to solve this without
forking (e.g. is there a way to 'append' a function call to the request
after the rest of the request is completed)?
Many thanks in advance.
--
Victor Danilchenko
Senior Software Engineer, AskOnline.net
vic...@askonline.net - 617-273-0119
At random moments, mod_perl starts returning empty pages
My website algebra.com has been moved to a new server running Ubuntu Hardy. While everything seems to be working well, esp. the kernel and solid state disk, I have one issue. The issue is that at random moments, usually once or twice a day, my webserver starts returning completely empty pages instead of actual content. The pages are mod_perl based. I tried restarting apache every 30 minutes, but it does not help. It appears to be a random issue as opposed to a server getting tired issue. I have a cron job that checks my webserver every 5 minutes and restarts it when necessary, but obviously I hate the situation and would like to fix it. Any pointers to get started would be appreciated. Igor
Re: Help -- how to fork an Apache process in mod_perl safely? Not Apache2:Subprocess...
There are all kinds of problems that you'll encounter and have to solve if
you fork. I found it's better to call at(1) to start another seperate
process immediatly. If you need to pass data JSON worked really well for
me.
-wjt
On Aug 25, 2009 5:12 AM, Victor Danilchenko vic...@askonline.net wrote:
Hi all,
I need to be able to fork an Apache process in daemon form, to do
some housekeeping which might potentially take a few seconds. However, when
I do that, I start getting SQL errors (of the connection lost type) in the
browser. I do the fairly standard cleanup to daemonize the child process,
but of course it needs to retain the SQL socket open. Here is my forking
code:
sub modperl_kamikaze_fork () {
# You will have to do CORE::exit(0) at the end of the execution.
$SIG{CHLD} = 'IGNORE';
get_m-flush_buffer;
defined (my $kid = fork) or die Cannot fork: $!\n;
return $kid if $kid;
my $r = get_r;
close STDIN; open STDIN, '/dev/null'
or die Can't read /dev/null: $!;
close STDOUT; open STDOUT, '/dev/null'
or die Can't write to /dev/null: $!;
close STDERR; open STDERR, '/tmp/form.log'
or die Cannot open /tmp/fork.log\n;
setsid
or die Can't start a new session: $!;
my $oldfh = select STDERR;
local $| = 1;
select $oldfh;
warn Child (PID $$) spawned.\n;
$r-child_terminate;
}
The Apache2:Subprocess doesn't help me, because I need not to spawn
an external process, but to finish processing in mod_perl context -- just
without bugging the user with it.
Any ideas on how to either fork better, or how to solve this without
forking (e.g. is there a way to 'append' a function call to the request
after the rest of the request is completed)?
Many thanks in advance.
--
Victor Danilchenko
Senior Software Engineer, AskOnline.net
vic...@askonline.net - 617-273-0119
mod_perl on win32
Hi all, I'd like to know if it's possible to build mod_perl on Win32; I'd like to use mod_perl with StrawberryPerl. It seems to be that the only way that could be done is to compile Apache also with MinGW, and that's not possible because of limited support for Windows Shared Memory in MinGW. Also if you'd try to compile mod_perl it will try to run ./configure on the Apache sources but that will fail on Win32 because 1. there is no Configure in the win32 Apache sources and 2. Windows will try to execute . which is not exactly an executable file... Does anyone have pointers or tips? Thanks in advance, -- Michiel Beijen ((otrs)) :: OTRS AG :: Norsk-Data-Straße 1 :: 61352 Bad Homburg Phone: +49 (0) 6172 681988 0 :: Fax: +49 (0) 9421 56818 18 http://www.otrs.com/ :: Communication with success! Geschäftssitz: Bad Homburg Amtsgericht Bad Homburg, HRB 10751 Steuernummer: 003 240 97505 Aufsichtsratsvorsitzender: Burchard Steinbild Vorstand: André Mindermann (Vorsitzender), Martin Edenhofer NEU! ENTERPRISE SUBSCRIPTION - JETZT informieren und buchen! http://www.otrs.com/de/support/enterprise-subscription/
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 8:09 AM, Igor Chudovichu...@gmail.com wrote: My website algebra.com has been moved to a new server running Ubuntu Hardy. While everything seems to be working well, esp. the kernel and solid state disk, I have one issue. The issue is that at random moments, usually once or twice a day, my webserver starts returning completely empty pages instead of actual content. The pages are mod_perl based. I tried restarting apache every 30 minutes, but it does not help. It appears to be a random issue as opposed to a server getting tired issue. I have a cron job that checks my webserver every 5 minutes and restarts it when necessary, but obviously I hate the situation and would like to fix it. Any pointers to get started would be appreciated. Please post your version details, and the relevant sections of httpd.conf. Have you witnessed this? Are you able to get any server response headers?
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 10:32 AM, Frank Wiles fr...@wiles.org wrote: Hmmm, that's a difficult situation to debug. Are you running anything in front of apache/mod_perl like perlbal or nginx? If so, those might be the cause. I am running perlbal in front of apache, yes. perlbal is a complete lifesaver for me, because my site is high traffic and perlbal takes care of lingering prowsers and such, to keep the number of my apache processes down. When I restart apache, I do not restart perlbal. I use perlbal everywhere, including on my old Fedora server, and it seems to be very stable. My suggestion would be to run a separate instance of your app on a high port with a single apache instance and see if you can find a way to reliably reproduce the problem. Then, if there isn't anything useful in the error log, use the debugger to step through the code as you reproduce the issue from the browser. I am afraid that it is hard to reproduce. Since I run ads and such, I cannot really afford to pause for very long to debug the issue, plus it happens randomly. My 5 minute restarter saves me from a very big trouble
Re: At random moments, mod_perl starts returning empty pages
Fred Moyer wrote: The issue is that at random moments, usually once or twice a day, my webserver starts returning completely empty pages instead of actual content. The pages are mod_perl based. I've seen this happen sometimes when something segfaults. And segfaults are usually the result of having incompatible binaries/libs on your system. Is there anything in your error logs about this? -- michael peters I played golf... I did not get a hole in one, but I did hit a guy. That's way more satisfying. - Mitch Hedberg
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 11:09 AM, Igor Chudovichu...@gmail.com wrote: The issue is that at random moments, usually once or twice a day, my webserver starts returning completely empty pages instead of actual content. What's in the error_log? - Perrin
Re: mod_perl on win32
Michiel Beijen wrote: I'd like to know if it's possible to build mod_perl on Win32; I'd like to use mod_perl with StrawberryPerl. It seems to be that the only way that could be done is to compile Apache also with MinGW, and that's not possible because of limited support for Windows Shared Memory in MinGW. There are various flaws in the build, report them to d...@httpd or collect them in bugzilla reports, and mind the existing reports which might already solve your problem. Since there is no MinGW port maintainer, this often falls apart, sorry there is nothing we can do if a platform's community does not participate with or engage the developers with patches. Also if you'd try to compile mod_perl it will try to run ./configure on the Apache sources but that will fail on Win32 because 1. there is no Configure in the win32 Apache sources and 2. Windows will try to execute . which is not exactly an executable file... Does anyone have pointers or tips? You don't use the -win32-src package because that package is for building on the Microsoft Windows platform. If you want to build for a faux-unix platform you would obtain the usual tarball.
RE: mod_perl on win32
William A. Rowe, Jr. wrote on 2009-08-25: Michiel Beijen wrote: I'd like to know if it's possible to build mod_perl on Win32; I'd like to use mod_perl with StrawberryPerl. It seems to be that the only way that could be done is to compile Apache also with MinGW, and that's not possible because of limited support for Windows Shared Memory in MinGW. There are various flaws in the build, report them to d...@httpd or collect them in bugzilla reports, and mind the existing reports which might already solve your problem. The other option, if you didn't specifically want to use StrawberryPerl, is to build perl, apache mod_perl with VC++ 2008 Express.
Re: At random moments, mod_perl starts returning empty pages
Nothing much is in error_log, I do print some of my outputs, but nothing of interest. What I know is that I can retrieve www.algebra.com/apache-status, it works fine. However, retrieving mod_perl pages returns empty pages. Igor On Tue, Aug 25, 2009 at 11:14 AM, Perrin Harkins phark...@gmail.com wrote: On Tue, Aug 25, 2009 at 11:09 AM, Igor Chudovichu...@gmail.com wrote: The issue is that at random moments, usually once or twice a day, my webserver starts returning completely empty pages instead of actual content. What's in the error_log? - Perrin
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 10:50 AM, Frank Wiles fr...@wiles.org wrote: I am afraid that it is hard to reproduce. Since I run ads and such, I cannot really afford to pause for very long to debug the issue, plus it happens randomly. My 5 minute restarter saves me from a very big trouble No of course, that's why I suggested running it on a higher port and leaving your production site alone. Just to isolate the problem down as small as possible. (i.e. no perlbal, single apache process, no other users, etc. ) to see if you can narrow down what piece of the puzzle is the one causing the issue. Frank, I tried to run apache2 -X and did thousands of queries, they did not break anything. It is something else. Re: segfaults: I do get segfaults in apache, indeed. Re: httpd config file: See attached. It is kind of big. httpd.conf Description: Binary data
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 1:07 PM, Igor Chudovichu...@gmail.com wrote: Nothing much is in error_log, I do print some of my outputs, but nothing of interest. What I know is that I can retrieve www.algebra.com/apache-status, it works fine. However, retrieving mod_perl pages returns empty pages. If you mean that they don't render in the browser, it would help if you look at the content being sent instead. It must be sending something, or you'd get a timeout error. - Perrin
Re: At random moments, mod_perl starts returning empty pages
One great tool that would help with the diagnosis is the very useful mp2bug, found in mod_perl-2.0/bin/mp2bug Can you run that from your mod_perl install and post the output? Version details are a huge clue in solving mysteries like this. On Tue, Aug 25, 2009 at 10:10 AM, Igor Chudovichu...@gmail.com wrote: On Tue, Aug 25, 2009 at 10:50 AM, Frank Wiles fr...@wiles.org wrote: I am afraid that it is hard to reproduce. Since I run ads and such, I cannot really afford to pause for very long to debug the issue, plus it happens randomly. My 5 minute restarter saves me from a very big trouble No of course, that's why I suggested running it on a higher port and leaving your production site alone. Just to isolate the problem down as small as possible. (i.e. no perlbal, single apache process, no other users, etc. ) to see if you can narrow down what piece of the puzzle is the one causing the issue. Frank, I tried to run apache2 -X and did thousands of queries, they did not break anything. It is something else. Re: segfaults: I do get segfaults in apache, indeed. Re: httpd config file: See attached. It is kind of big.
Re: mod_perl2 interactive startup
Malloy - thanks for responding. Unfortunately using restart_count does not address my issue. In the http.conf I have the following: ... PerlConfigRequire conf/startup.pl ... My test startup.pl has this: our $INPUT; print STDERR Input:; $INPUT = STDIN; print STDERR you entered $INPUT; My issue is during the first start everything works as I need it to, Input: is printed out to the terminal and the script waits for input. The problem is for the automatic restart everything is tied to the log files. Everything printed to STDERR goes into the logs and a user cannot enter any input. For the restart how can I print messages and prompt for input? Thanks. ---Alex Quoting Malloy jackwor...@gmail.com: Dealing with Restarts Ideally the code running at the server startup shouldn't be affected by the apache restart. If however this is not the case, you can use Apache2::ServerUtil::restart_count. More Info: http://perl.apache.org/docs/2.0/user/handlers/server.html On Wed, Aug 19, 2009 at 4:54 AM, ama...@solutionsforprogress.com wrote: I am in the process of porting a mod_perl app to mod_perl2. The original mod_perl app has an interactive startup during which a DB password is prompted for. During the mod_perl2 startup this feature works fine at first but mod_perl2 always does a restart and during the second restart STDERR is being redirected to the log files and STDIN is ignored. So I am trying to figure out how to either: 1) Prevent the automatic restart or 2) Have STDERR and STDIN be tied to the terminal during the restart the same way they are during the initial start Here info about my system: Apache/2.2.9 (Debian) mod_apreq2-20051231/2.6.0 mod_perl/2.0.4 Perl/v5.10.0 Thank you in advance for any help/insight. --Alex -- Jack Malloy
Re: mod_perl on win32
Michiel Beijen a écrit :
I'd like to know if it's possible to build mod_perl on Win32; I'd like
to use mod_perl with StrawberryPerl. It seems to be that the only way
that could be done is to compile Apache also with MinGW, and that's not
possible because of limited support for Windows Shared Memory in MinGW
Here is how I installed StrawberryPerl + mod_perl + apache2 on Windows
(tested onVista):
1. Apache
Go to http://httpd.apache.org/download.cgi
Click on /Win32 Binary including OpenSSL 0.9.8i (MSI Installer) /
Some recommend to install it in a directory without space, although I
did not do that and it still work.
2. Perl
Go to http://strawberryperl.com/ and install the latest kit
3. I then use the script send in attachement to install all modules I
need, e.g. perl install_modules.pl
At the top of the script you will see how to get mod_perl2 and various
other stuff I need for my project. Just the lines for the modules you do
not need.
HTH,
Cheers, JD.
#!/usr/bin/perl
#
## This script, intended to be run by an installer on Windows
## will hopefully verify packages needed by Freecity are
## installed - and will attempt to install them if needed
#
## (c) 2008 by Jean-Damien Durand jeandamiendur...@free.fr
#
use 5.10.0;
use strict;
use diagnostics;
use Config;
use File::Spec;
use CPAN;
my %required_modules = (
'mod_perl2' =
'http://cpan.uwinnipeg.ca/PPMPackages/10xx/mod_perl.ppd',
'Apache2::Request' =
'http://cpan.uwinnipeg.ca/PPMPackages/10xx/libapreq2.ppd',
'GD'= 'http://www.bribes.org/perl/ppm/GD.ppd',
'GD::Text' = 'http://www.bribes.org/perl/ppm/GDTextUtil.ppd',
'Template' =
'http://cpan.uwinnipeg.ca/PPMPackages/10xx/Template-Toolkit.ppd',
'Config::General' =
'http://cpan.uwinnipeg.ca/PPMPackages/10xx/Config-General.ppd',
'Apache::DBI' = 'http://trouchelle.com/ppm10/Apache-DBI.ppd',
'CGI::Simple' = 'http://trouchelle.com/ppm10/CGI-Simple.ppd',
'HTML::Tree'= 'http://trouchelle.com/ppm10/HTML-Tree.ppd',
'File::Type'= 'http://trouchelle.com/ppm10/File-Type.ppd',
'Image::Size' = 'http://trouchelle.com/ppm10/Image-Size.ppd',
'Net::Telnet' = 'http://trouchelle.com/ppm10/Net-Telnet.ppd',
'I18N::Charset' = 'http://trouchelle.com/ppm10/I18N-Charset.ppd',
'XML::RSS' = 'http://trouchelle.com/ppm10/XML-RSS.ppd',
'Win32::Process'= 'http://trouchelle.com/ppm10/Win32-Process.ppd',
'Win32::DriveInfo' = 'http://trouchelle.com/ppm10/Win32-DriveInfo.ppd',
'List::MoreUtils' =
'http://cpan.uwinnipeg.ca/PPMPackages/10xx/List-MoreUtils.ppd',
'Win32::FileOp' = 'http://trouchelle.com/ppm10/Win32-FileOp.ppd',
'Win32::Service'= 'http://trouchelle.com/ppm10/Win32-Service.ppd',
'Win32::OLE'= 'http://www.bribes.org/perl/ppm/Win32-OLE.ppd',
'Text::Chomp' = 'http://trouchelle.com/ppm10/Text-Chomp.ppd',
'Number::Format'= 'http://trouchelle.com/ppm10/Number-Format.ppd',
'Object::Multitype' = 'http://trouchelle.com/ppm10/Object-MultiType.ppd',
'Win32::IPHelper' = 'http://trouchelle.com/ppm10/Win32-IPHelper.ppd',
'NetAddr::IP' = 'http://trouchelle.com/ppm10/NetAddr-IP.ppd'
);
print \n;
print \n;
print Freecity va verifier et installer si necessaire des \n;
print modules perl necessaires a son fonctionnement. \n;
print \n;
print \n;
print Appuyez sur Entree ou Return pour continuer \n;
print \n;
my $dummy;
read(STDIN, $dummy, 1);
# -
## Get install directory of perl
# -
my $installbin = $Config{installbin} || die No installbin in perl config !?\n;
my $installsitelib = $Config{installsitelib} || die No installsitelib in perl
config !?\n;
# ---
## This is for Time::ParseDate
# ---
$ENV{TZ}='PST8PDT';
# --
## Check required modules
# --
my $module;
my $cpanmod;
my $ppm = File::Spec-catfile($installbin, 'ppm.bat');
foreach $module (sort keys %required_modules) {
my $found = 0;
#
## For GD we force the installation
#
if ($module ne 'GD') {
foreach $cpanmod (CPAN::Shell-expand(Module, $module)){
++$found;
if ($cpanmod-inst_file) {
print $cpanmod-id, is already installed\n;
next;
}
install_module($module);
last;
}
} else {
print Forcing $module installation\n;
}
if ($found == 0) {
install_module($module);
}
}
#
## Special hook for Params::Validate that is since recently... buggy - move to
a perl only solution
#
my $validatedll =
Re: mod_perl on win32
Jean-Damien Durand a écrit : Here is how I installed StrawberryPerl + mod_perl + apache2 on Windows (tested onVista): Ah yes of course you will need to add lines like LoadFile C:\strawberry\perl\bin\perl510.dll LoadModule perl_module modules/mod_perl.so LoadFile C:\Program Files\Apache Software Foundation\Apache2.2\bin\libapreq2.dll LoadModule apreq_module modules/mod_apreq2.so in your httpd.conf (change paths if needed) Cheers, JD.
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 12:05 PM, Igor Chudovichu...@gmail.com wrote: On Tue, Aug 25, 2009 at 12:16 PM, Fred Moyer f...@redhotpenguin.com wrote: One great tool that would help with the diagnosis is the very useful mp2bug, found in mod_perl-2.0/bin/mp2bug Can you run that from your mod_perl install and post the output? Version details are a huge clue in solving mysteries like this. Fred, thanks. here goes. -8-- Start Bug Report 8-- 1. Problem Description: [DESCRIBE THE PROBLEM HERE] 2. Used Components and their Configuration: *** mod_perl version 2.03 Suggest trying 2.0.4. If that still exhibits the problem, suggest pulling a copy of subversion trunk and trying that. I'm currently running trunk on my servers (very stable). *** using /usr/lib/perl5/Apache2/BuildConfig.pm *** Makefile.PL options: MP_APR_LIB = aprext MP_APXS = /usr/bin/apxs2 MP_CCOPTS = -g -Wall MP_COMPAT_1X = 1 MP_GENERATE_XS = 1 MP_INCLUDE_DIR = /usr/include/apache2 /usr/include/apr-1.0 MP_LIBNAME = mod_perl MP_TRACE = 0 MP_USE_DSO = 1 MP_USE_GTOP = 1 MP_USE_STATIC = 0 *** The httpd binary was not found *** (apr|apu)-config linking info (apr|apu)-config scripts were not found *** /usr/bin/perl -V Summary of my perl5 (revision 5 version 8 subversion 8) configuration: Platform: osname=linux, osvers=2.6.24-19-server, archname=i486-linux-gnu-thread-multi uname='linux palmer 2.6.24-19-server #1 smp sat jul 12 00:40:01 utc 2008 i686 gnulinux ' config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.8 -Dsitearch=/usr/local/lib/perl/5.8.8 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.8 -Dd_dosuid -des' hint=recommended, useposix=true, d_sigaction=define usethreads=define use5005threads=undef useithreads=define usemultiplicity=define useperlio=define d_sfio=undef uselargefiles=define usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2', cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include' ccversion='', gccversion='4.2.3 (Ubuntu 4.2.3-2ubuntu7)', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=4, prototype=define Linker and Libraries: ld='cc', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt perllibs=-ldl -lm -lpthread -lc -lcrypt libc=/lib/libc-2.7.so, so=so, useshrplib=true, libperl=libperl.so.5.8.8 gnulibc_version='2.7' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib' Characteristics of this binary (from libperl): Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP THREADS_HAVE_PIDS USE_ITHREADS USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API Built under linux Compiled at Jan 14 2009 22:34:36 %ENV: PERL5LIB=/home/ichudov/misc/life/modules:/home/ichudov/lisleelectric.com PERLLIB=/home/ichudov/misc/life/modules:/home/ichudov/lisleelectric.com PERL_LWP_USE_HTTP_10=1 @INC: /home/ichudov/misc/life/modules /home/ichudov/lisleelectric.com /etc/perl /usr/local/lib/perl/5.8.8 /usr/local/share/perl/5.8.8 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl . *** Packages of interest status: Apache2 : - Apache2::Request : - CGI : 3.15 ExtUtils::MakeMaker: 6.30_01, 6.54 LWP : 5.808 mod_perl : - mod_perl2 : 2.03 3. This is the core dump trace: (if you get a core dump): [CORE TRACE COMES HERE] This report was generated by /usr/share/libapache2-mod-perl2/mp2bug on Tue Aug 25 19:04:41 2009 GMT. -8-- End Bug Report --8--
Re: At random moments, mod_perl starts returning empty pages
Igor, Please cc the mod_perl list on all replies. I'm available for professional mod_perl consulting offlist, but I don't come cheap :) On Tue, Aug 25, 2009 at 12:14 PM, Igor Chudovichu...@gmail.com wrote: On Tue, Aug 25, 2009 at 2:07 PM, Fred Moyer f...@redhotpenguin.com wrote: *** mod_perl version 2.03 Suggest trying 2.0.4. If that still exhibits the problem, suggest pulling a copy of subversion trunk and trying that. I'm currently running trunk on my servers (very stable). Fred, I have not compiled mod_perl in ~4 years. What is the process here, do I just download tarball and do configure and install? Is it any trickier? http://perl.apache.org/docs/2.0/user/intro/start_fast.html The risks involved are kind of big here. So I want to be safe and have a good plan. Suggest building this side by side with your existing installation. Suggest testing this out first on your test environment.
Re: At random moments, mod_perl starts returning empty pages
Perrin, the pages are zero length. In my script that checks for this condition, if I find trouble I save a few webpages to files. (/, some other page and apache-status). The first two are zero length. Igor On Tue, Aug 25, 2009 at 12:14 PM, Perrin Harkins phark...@gmail.com wrote: On Tue, Aug 25, 2009 at 1:07 PM, Igor Chudovichu...@gmail.com wrote: Nothing much is in error_log, I do print some of my outputs, but nothing of interest. What I know is that I can retrieve www.algebra.com/apache-status, it works fine. However, retrieving mod_perl pages returns empty pages. If you mean that they don't render in the browser, it would help if you look at the content being sent instead. It must be sending something, or you'd get a timeout error. - Perrin
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 12:16 PM, Fred Moyer f...@redhotpenguin.com wrote: One great tool that would help with the diagnosis is the very useful mp2bug, found in mod_perl-2.0/bin/mp2bug Can you run that from your mod_perl install and post the output? Version details are a huge clue in solving mysteries like this. Fred, thanks. here goes. -8-- Start Bug Report 8-- 1. Problem Description: [DESCRIBE THE PROBLEM HERE] 2. Used Components and their Configuration: *** mod_perl version 2.03 *** using /usr/lib/perl5/Apache2/BuildConfig.pm *** Makefile.PL options: MP_APR_LIB = aprext MP_APXS= /usr/bin/apxs2 MP_CCOPTS = -g -Wall MP_COMPAT_1X = 1 MP_GENERATE_XS = 1 MP_INCLUDE_DIR = /usr/include/apache2 /usr/include/apr-1.0 MP_LIBNAME = mod_perl MP_TRACE = 0 MP_USE_DSO = 1 MP_USE_GTOP= 1 MP_USE_STATIC = 0 *** The httpd binary was not found *** (apr|apu)-config linking info (apr|apu)-config scripts were not found *** /usr/bin/perl -V Summary of my perl5 (revision 5 version 8 subversion 8) configuration: Platform: osname=linux, osvers=2.6.24-19-server, archname=i486-linux-gnu-thread-multi uname='linux palmer 2.6.24-19-server #1 smp sat jul 12 00:40:01 utc 2008 i686 gnulinux ' config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.8 -Dsitearch=/usr/local/lib/perl/5.8.8 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.8 -Dd_dosuid -des' hint=recommended, useposix=true, d_sigaction=define usethreads=define use5005threads=undef useithreads=define usemultiplicity=define useperlio=define d_sfio=undef uselargefiles=define usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2', cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include' ccversion='', gccversion='4.2.3 (Ubuntu 4.2.3-2ubuntu7)', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=4, prototype=define Linker and Libraries: ld='cc', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt perllibs=-ldl -lm -lpthread -lc -lcrypt libc=/lib/libc-2.7.so, so=so, useshrplib=true, libperl=libperl.so.5.8.8 gnulibc_version='2.7' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib' Characteristics of this binary (from libperl): Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP THREADS_HAVE_PIDS USE_ITHREADS USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API Built under linux Compiled at Jan 14 2009 22:34:36 %ENV: PERL5LIB=/home/ichudov/misc/life/modules:/home/ichudov/ lisleelectric.com PERLLIB=/home/ichudov/misc/life/modules:/home/ichudov/lisleelectric.com PERL_LWP_USE_HTTP_10=1 @INC: /home/ichudov/misc/life/modules /home/ichudov/lisleelectric.com /etc/perl /usr/local/lib/perl/5.8.8 /usr/local/share/perl/5.8.8 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl . *** Packages of interest status: Apache2: - Apache2::Request : - CGI: 3.15 ExtUtils::MakeMaker: 6.30_01, 6.54 LWP: 5.808 mod_perl : - mod_perl2 : 2.03 3. This is the core dump trace: (if you get a core dump): [CORE TRACE COMES HERE] This report was generated by /usr/share/libapache2-mod-perl2/mp2bug on Tue Aug 25 19:04:41 2009 GMT. -8-- End Bug Report --8--
portability of mod_perl for other web servers/apps
Hi Gurus, I recently started exploring mod_perl, and am really impressed with the flexibility this can provide for Apache. This may sound far fetched, but has anyone tried porting mod_perl for web servers other than Apache. I understand this is developed as a module for Apache, and integrates tightly with it, after all its an Apache module. But looking at the flexibility it offers, I was wondering if anyone thought of extending it for other servers. Basically, I am looking for integrating some of mod_perl functionality in some high performance middleware, basically to provide a way to customized, scriptable request processing in the request processing engine. Thanks, Deven -- View this message in context: http://www.nabble.com/portability-of-mod_perl-for-other-web-servers-apps-tp25140259p25140259.html Sent from the mod_perl - General mailing list archive at Nabble.com.
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 2:24 PM, Fred Moyer f...@redhotpenguin.com wrote: Igor, Please cc the mod_perl list on all replies. I'm available for professional mod_perl consulting offlist, but I don't come cheap :) Sorry, I pressed a wrong button in GMail. :) On Tue, Aug 25, 2009 at 12:14 PM, Igor Chudovichu...@gmail.com wrote: On Tue, Aug 25, 2009 at 2:07 PM, Fred Moyer f...@redhotpenguin.com wrote: *** mod_perl version 2.03 Suggest trying 2.0.4. If that still exhibits the problem, suggest pulling a copy of subversion trunk and trying that. I'm currently running trunk on my servers (very stable). Fred, I have not compiled mod_perl in ~4 years. What is the process here, do I just download tarball and do configure and install? Is it any trickier? http://perl.apache.org/docs/2.0/user/intro/start_fast.html The risks involved are kind of big here. So I want to be safe and have a good plan. Suggest building this side by side with your existing installation. Suggest testing this out first on your test environment. OK, I did build it, it was nice. My plan is to: 1) Remove ubuntu mod_perl package 2) Do make install 3) test If test succeeds, I will stop. If test fails, I would reinstall the system mod_perl. Is that a safe plan? Thank you. Igor
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 1:07 PM, Igor Chudovichu...@gmail.com wrote: The risks involved are kind of big here. So I want to be safe and have a good plan. Suggest building this side by side with your existing installation. Suggest testing this out first on your test environment. OK, I did build it, it was nice. My plan is to: 1) Remove ubuntu mod_perl package 2) Do make install 3) test If test succeeds, I will stop. If test fails, I would reinstall the system mod_perl. Is that a safe plan? I'd try this on a test server first (which ideally is a replicate of your production environment. Best thing to do is have a rollback plan IMHO.
Re: At random moments, mod_perl starts returning empty pages
On Tue, Aug 25, 2009 at 8:50 PM, Fred Moyer f...@redhotpenguin.com wrote: My plan is to: 1) Remove ubuntu mod_perl package 2) Do make install 3) test If test succeeds, I will stop. If test fails, I would reinstall the system mod_perl. Is that a safe plan? I'd try this on a test server first (which ideally is a replicate of your production environment. Best thing to do is have a rollback plan IMHO. Yes, the above was what I would consider a rollback plan. I will indeed try it first on a non-production server. I have some news regarding this that I will post in a separate message.
News regarding mod_perl returning empty pages
I have an update on this story. I set up a shell script that would notice this condition (empty pages returned) and alert me immediately via wall within 10 seconds. So I caught this in progress, before my 5 minute restarter would intervene, and experimented quickly. As I mentioned before, I have perlbal running in front on port 80, with apache listening on localhost port 10080 and serving perlbal. Since we discussed perlbal, I tried to access http://localhost.algebra.com:10080/ instead of www.algebra.com. ( localhost.algebra.com resolves to 127.0.0.1 and is an alias for www.algebra.com). Results were materially different: instead of 100% failures that I had with perlbal, I would only fail one out of many times. The failure became intermittent instead of constant. I believe that I have an explanation: only one worker happens to be messed up. When I access apache directly, I would connect to a random worker, so my failure would be intermittent. However, perlbal was set (in perlbal.conf) to maintain persistent connection, so it would mostly bang on one worker instead of randomly hitting them. As a result, with perlbal, if that worker goes bad, then the whole website is consistently not working. In other words, perlbal is not the issue, as such, but it exacerbated the problem due to the way I set it up. I changed perlbal.conf to set persist_backend = off, which, I hope, will have an effect of perlbal creating a separate connection for every request. Should not have much effect, speed wise, since everything runs on localhost, I hope. My new perlbal.conf is included: REATE POOL dynamic pool dynamic add 127.0.0.1:10080 CREATE SERVICE balancer SET listen = 0.0.0.0:80 SET role = reverse_proxy SET pool = dynamic SET persist_client = on SET persist_backend = off SET verify_backend = on ENABLE balancer # always good to keep an internal management port open: CREATE SERVICE mgmt SET role = management SET listen = 127.0.0.1:6 ENABLE mgmt
