Apache modules

Modules are either compiled in (static) or dynamically loaded (shared).

List static with httpd -l

List all with httpd -t -D DUMP_MODULES

Shared modules are stored in /etc/httpd/modules/

Shared modules are either loaded directly in httpd.conf or by looking in conf.d/*.conf

E.g. conf.d/perl.conf

...

LoadModule perl_module modules/mod_perl.so

...

Here are some paths that are good to know (Apache on CentOS):

Executables /usr/sbin

Config /etc/httpd

Logs /etc/httpd/log

Web Root /var/www/html

Configure Apache for multiple instances of catalyst module in fastcgi

FastCgiServer /home/andreas/MyModule/script/pbweb_fastcgi.pl -processes 3

FastCgiServer /home/andreas/MyModule2/script/pbweb_fastcgi.pl -processes 3

NameVirtualHost *:80

<VirtualHost *:80>

ServerName a.xyz.com

Alias / /home/andreas/mymodulea/script/mymodule_fastcgi.pl/

</virtualhost>

<VirtualHost *:80>

ServerName b.xyz.com

Alias / /home/andreas/mymoduleb/script/mymodule_fastcgi.pl/

</virtualhost>

The end / after mymodule_fastcgi.pl is really important.

Configure Apache for multiple instances of catalyst module in mod_perl

The trick was to:

use virtual hosts

PerlOptions +Parent to create a new interpreter

PerlModule instead of PerlLoadModule which caused apache to crash

NameVirtualHost *:80

<VirtualHost *:80 />

ServerName a.xyz.com

PerlOptions +Parent

PerlSwitches -IC:/mymodulea/lib -IC:/morestuff/lib

PerlModule MyModule

<Location />

SetHandler modperl

PerlResponseHandler MyModule

</Location>

</VirtualHost>

<VirtualHost *:80 />

ServerName b.xyz.com

PerlOptions +Parent

PerlSwitches -IC:/mymoduleb/lib -IC:/morestuff/lib

PerlModule MyModule

<Location />

SetHandler modperl

PerlResponseHandler MyModule

</Location>

</VirtualHost>

Update

Sorry to say I only got this working on Windows since DBD:Pg caused error on CentOS.

Some CentOS basics

First try
Some basic app admin

chkconfig, activate/deactivate services,

service, start and stop services

system-config-securitylevel

Get VNC up and running

Follow the instructions.

If you get an error that says bad display name when starting the vgcnserver at the end make sure that the machine recognizes it’s name. If not add it to /etc/hosts.

Open up the firewall for 5901 (and perhaps more) by running system-config-securitylevel

Apache

service httpd start

chkconfig httpd on

Works to connect from my windows machine after this

PostgreSQL

Followed the instructions approximately.

Got an error at the Starting postgresql service: prompt.

Read something about SELinux causing problems so I shut it down and rebooted and the server seems to be running. Don’t know if it was related with SELinux though.

Second try

During installation
For tasks, choose “Desktop – Gnome” and Server
Disable firewall and SELinux

Installed software
Perl 5.8.8
mod_perl 2.0.4
httpd 2.2.3
PostgreSQL not installed
Check installed version:

# rpm -q

VNC
As above.

PostgreSQL
8.3.6 install
# rpm -Uvh http://yum.pgsqlrpms.org/reporpms/8.3/pgdg-centos-8.3-6.noarch.rpm
# yum install postgresql-server
Followed the book then a bit for initdb:

# su - postgres
-bash-3.2$ initdb
...
-bash-3.2$ exit
Start service and autostart at reboot:

# service postgresql start
# chkconfig postgresql on

Ended up with 8.3.9 but that should be ok.

Createuser and db:

# su - postgres
-bash-3.2$ createuser XYZ
-bash-3.2$ createdb -O XYZ XYZ

ftp
service vsftpd start
chkconfig vsftpd on

Add data to db
# psql -U XYZ < XYZ.sql

Apache
As above.

Perl stuff

Started with:

# yum install postgresql-devel.x86_64
# yum install gcc
since pg_config and gcc is needed when running:

# cpan install Bundle::DBD::Pg
When checking things out with get_datasources.pl (from the book) make sure to use a user that can read db and script. I added XYZ as a unix user and copied the script to ~ before getting it to work. Don’t know why though.

# cpan install Catalyst::Devel
Results in a million dependencies, just said yes to everything. Something was installed.

Open stuff for web development

CentOS

Apache web server

PostgreSQL

SQLite

Catalyst

Template Toolkit

Perl