Install on a clean Debian 4.0 Etch
Needed packages:

apt-get install mysql-server

apt-get install apache2

apt-get install libapache2-mod-perl2

apt-get install libapache-dbi-perl

apt-get install libemail-date-perl

apt-get install libnet-dns-perl

apt-get install libnet-ldap-perl

apt-get install libnet-imap-simple-ssl-perl

apt-get install libgd-perl

apt-get install libgd-text-perl

apt-get install libgd-graph-perl

apt-get install libpdf-api2-perl

apt-get install libxml-parser-perl

Get OTRS tarball with wget.

wget http://ftp.otrs.org/pub/otrs/otrs-2.3.4.tar.gz

Create system account:

useradd -d /opt/otrs/ -c 'OTRS user' otrs

usermod -G www-data otrs

Installation:

cd /opt

tar xvzf /root/otrs-2.3.2.tar.gz

mv otrs-2.3.2 otrs

chmod -R 777 otrs

cd otrs/Kernel

cp Config.pm.dist Config.pm

cd Config

cp GenericAgent.pm.dist GenericAgent.pm

Check packages:

/opt/otrs/bin/otrs.checkModules

if some module is missing, go with apt-get and install the appropriate module.

MySQL config.

enter mysql prompt with:

mysql -u root -p

create database otrs;

grant all privileges on otrs.* to 'otrs'@'localhost' identified by "password" with grant option;

drop database otrs;

quit

Web server config:

into /opt/otrs/scripts/apache-perl-startup.pl
uncomment these lines (and modify user/password accordingly on the second row):

use Apache::DBI ();
Apache::DBI->connect_on_init('DBI:mysql:otrs', 'otrs', 'password');
use DBI ();
use DBD::mysql ();

create Apache 2 startup script:

/etc/init.d/apache2 stop

cd /etc/apache2/conf.d

cp /opt/otrs/scripts/apache2-httpd-new.include.conf /etc/apache2/conf.d/otrs

/etc/init.d/apache2 start

Configurazione OTRS:

modify /opt/otrs/Kernel/Config.pm, inserting DB user and password selected on MySQL step and other parameters (SMTP, ecc)

Cron jobs:

cd /opt/otrs/var/cron

for foo in *.dist; do cp $foo `basename $foo .dist`; done

modify file without dist extension to suit your needs:

/opt/otrs/bin/Cron.sh start otrs

Set permissions:

/opt/otrs/bin/SetPermissions.sh /opt/otrs otrs www-data www-data www-data

End installation:

go to

http://indirizzoserver/otrs/installer.pl

then

http://indirizzoserver/otrs-web/

first login User/Pw : root@localhost/root