SID-02477: Perl issues while starting webserver

Status:	Answered	TWiki version:	6.1.0	Perl version:	Red Hat Enterprise Linux Server release 7.9 (Maipo)
Category:	CategoryInstallation	Server OS:	Red Hat Enterprise Linux Server release 7.9 (Maipo)	Last update:	4 years ago

I am setting up a new twiki environment and keep getting "Invalid command 'PerlRequire', perhaps misspelled or defined by a module not included in the server configuration" when I try to start the webserver. Below information will be helpful.

[root@muvmp065 ~]# whereis perl perl: /usr/bin/perl /usr/share/man/man1/perl.1.gz

/usr/share/perl5

[root@muvmp065 ~]# yum install perl Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

Package 4:perl-5.16.3-299.el7_9.x86_64 already installed and latest version Nothing to do [root@muvmp065 ~]#

-- Anwar Ansari - 2021-11-15

Discussion and Answer

The directive PerlRequire in the server configuration works only if you load mod_perl into your web server. I'm not familiar with RHEL, but maybe the Question in the Red Hat Customer Portal helps. It seems that mod_perl is at least available via EPEL.

-- Harald Jörg - 2021-11-15

Thanks. It helped to fix the problem but now I am getting new issue while starting httpd. Below is the error log. Please let me know if there is any help on this as well-

[Tue Nov 16 12:07:07.403629 2021] [perl:error] [pid 3750] Can't locate CGI.pm in @INC (@INC contains: /var/www/html/wiki5/lib . /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 /etc/httpd /var/www/html/wiki5/lib/CPAN/lib//arch /var/www/html/wiki5/lib/CPAN/lib//5.16.3/x86_64-linux-thread-multi /var/www/html/wiki5/lib/CPAN/lib//5.16.3 /var/www/html/wiki5/lib/CPAN/lib/) at /var/www/html/wiki5/lib/TWiki.pm line 76.\nBEGIN failed--compilation aborted at /var/www/html/wiki5/lib/TWiki.pm line 76.\nCompilation failed in require at /var/www/html/wiki5/lib/TWiki/UI.pm line 91.\nBEGIN failed--compilation aborted at /var/www/html/wiki5/lib/TWiki/UI.pm line 91.\nCompilation failed in require at /var/www/html/wiki5/bin/addsection line 30.\nBEGIN failed--compilation aborted at /var/www/html/wiki5/bin/addsection line 30.\nCompilation failed in require at (eval 2) line 1.\n

[Tue Nov 16 12:07:07.403648 2021] [perl:error] [pid 3750] Can't load Perl file: /var/www/html/wiki5/tools/mod_perl_startup.pl for server 10.135.40.108:80, exiting...

-- Anwar Ansari - 2021-11-16

If your provider doesn't provide CGI.pm (which is not unheard of in RHEL-world), then you could either install CgiContrib dig into the CPAN module CPAN:local::lib which allows to install CPAN modules in an arbitrary directory. I thought that this plugin ships with recent TWiki versions - so please also check your settings in bin/LocalLib.

-- Harald Jörg - 2021-11-16

Thanks for your help. After all setup I get below error when I hit https://hostxyz/bin/configure

Software error: Failed to load the perl module TWiki::Configure::Load. The module was found at /apps/data/wiki5/lib/TWiki/Configure/Load.pm, but I don't have permission to read it.

Please ensure that:

1. TWiki::Configure::Load is installed,
2. that the module is available on the @INC path,
3. that the webserver user (apache) has permission to read the TWiki/Configure/Load.pm file.

The detailed error seen was: Use of qw(...) as parentheses is deprecated at /apps/data/wiki5/lib/TWiki/Configure/Load.pm line 89. Compilation failed in require at (eval 28) line 2. BEGIN failed--compilation aborted at (eval 28) line 2.

NOTE that I was unable to load LocalLib.cfg because of the following error:

defined(@array) is deprecated at setlib.cfg line 53. Compilation failed in require at (eval 9) line 1.

-- Anwar Ansari - 2021-11-26

You seem to run a pretty outdated version of TWiki, definitely not version 6.1.0.

• The "Use of qw() as parentheses" was fixed in 2011 and released with TWiki 5.1.1, see Bugs:Item6800
• defined(@array) - this was fixed in 2014 and released with TWiki 6.0.1, see Bugs:Item7487

So what you need to do to run with a "modern" Perl is upgrade to a TWiki version which can cope with the changes that came with Perl.

-- Harald Jörg - 2021-11-26

Thanks a lot for your response. I have installed latest twiki version TWiki-6.1.0 and when I start the webserver, getting below error. Could you please help.

[Sat Nov 27 08:38:27.448034 2021] [perl:error] [pid 25556] Content-type: text/plain\n\nPerl error when reading LocalSite.cfg: \nPlease inform the site admin.\nBEGIN failed--compilation aborted at /var/www/html/twiki/lib/TWiki.pm line 585.\nCompilation failed in require at /var/www/html/twiki/bin/attach line 45.\nBEGIN failed--compilation aborted at /var/www/html/twiki/bin/attach line 45.\nCompilation failed in require at (eval 2) line 1.\n [Sat Nov 27 08:38:27.448058 2021] [perl:error] [pid 25556] Can't load Perl file: /var/www/html/twiki/tools/mod_perl_startup.pl for server hostnamexxxx:80, exiting...

-- Anwar Ansari - 2021-11-27

Referring to below error-

[Sat Nov 27 08:38:27.448058 2021] [perl:error] [pid 25556] Can't load Perl file: /var/www/html/twiki/tools/mod_perl_startup.pl for server muvmp066.emea.nsn-net.net:80, exiting...

mod_perl_startup.pl did not come with the twiki "TWiki-6.1.0" and I copied it from older twiki version (5.1)

-- Anwar Ansari - 2021-11-27

Indeed, mod_perl_startup.pl is not distributed with TWiki. There was some debate in 2008 about such a script in ModPerlStartupScript, and I guess your installation has a copy of one of the versions mentioned in this topic.

I can't say from a distance, but maybe you need to copy your lib/LocalSite.cfg from your old installation to your 6.1 installation? TWiki's bootstrapping in configure usually fixes that for you, but mod_perl_startup runs during before that, server startup. So if you try to compile TWiki modules in that file, it already needs lib/LocalSite.cfg in place.

-- Harald Jörg - 2021-11-27

Unless you have many simultaneous users, or want the extra speed you do not really need to run TWiki under mod_perl.

Did you run the ApacheConfigGenerator for your environment?

-- Peter Thoeny - 2021-11-27

Thanks Peter and Harald, my issue has been fixed.

-- Anwar Ansari - 2021-12-06

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