Apache httpd : Configure mod_perl2021/03/15

	Install [mod_perl] to make Perl scripts be fast.
[1]	Install [mod_perl].

# install from EPEL

[root@www ~]#

dnf --enablerepo=epel -y install mod_perl

[2]	Configure [PerlRun] mode which always put Perl interpreter on RAM.

[root@www ~]#

vi /etc/httpd/conf.d/perl.conf

# line 15 : uncomment (check codes and output warnings to logs)

PerlSwitches -w

# line 24 : uncomment

PerlSwitches -T

# line 30-37 : uncomment like follows

Alias /perl /var/www/perl
<Directory /var/www/perl>
    # processes files as perl-scripts under the directory
    SetHandler perl-script
    # set specific extension if do not want to processes all files as CGI (comment out the line above, too)
    AddHandler perl-script .cgi
#    PerlResponseHandler ModPerl::Registry
    # add the line to specify PerlRun mode
    PerlResponseHandler ModPerl::PerlRun
    PerlOptions +ParseHeaders
    Options +ExecCGI
</Directory>

# line 43-49 : uncomment and add like follows (for status page)

<Location /perl-status>
    SetHandler perl-script
    PerlResponseHandler Apache2::Status
    # set any acccess permission you need
    Require ip 127.0.0.1 10.0.0.0/24 
#    Order deny,allow
#    Deny from all
#    Allow from .example.com
</Location>

[root@www ~]#

systemctl restart httpd

[3]	Create a test script to verify settings.

[root@www ~]#

mkdir /var/www/perl

[root@www ~]#

vi /var/www/perl/test-mod_perl.cgi

#!/usr/bin/perl

use strict;
use warnings;

print "Content-type: text/html\n\n";

my $a = 0;
&number();

sub number {
    $a++;
    print "number \$a = $a \n";
}

[root@www ~]#

chmod 705 /var/www/perl/test-mod_perl.cgi

[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 1

[4]	Configure Registry mode which has caches of executed codes on RAM.

[root@www ~]#

vi /etc/httpd/conf.d/perl.conf

Alias /perl /var/www/perl
<Directory /var/www/perl>
#    SetHandler perl-script
    AddHandler perl-script .cgi
    # enable the line for Registry mode
    PerlResponseHandler ModPerl::Registry
#    PerlResponseHandler ModPerl::PerlRun
    PerlOptions +ParseHeaders
    Options +ExecCGI
</Directory>

[root@www ~]#

systemctl restart httpd

[5]	Access to the test script which is an example of [3] section, then variable increases by reloading because variable is cached on RAM. So it's necessarry to edit the code for Registry mode.

[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 1
[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 2
[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 3

[root@www ~]#

vi /var/www/perl/test-mod_perl.cgi

#!/usr/bin/perl

use strict;
use warnings;

print "Content-type: text/html\n\n";

my $a = 0;
&number($a);

sub number {
    my($a) = @_;
    $a++;
    print "number \$a = $a \n";
}

[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 1
[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 1
[root@www ~]#

curl https://www.srv.world/perl/test-mod_perl.cgi

number $a = 1

[6]	By the way, it's possible to see the status of [mod_perl] to access to [(your hostname or IP address)/perl-status].

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