CentOS 7.x Install and configure OTRS

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1. Install EPEL using:

   yum install epel-release -y

2. Install HTTPD and MARIADB using:

   yum install httpd mariadb-server mariadb -y

3. Start Apache and MariaDB server and enable them to start on boot

   systemctl start httpd
   systemctl start mariadb
   systemctl enable httpd
   systemctl enable mariadb

4. Secure Mariadb using:

   mysql_secure_installation

5. Create DB for OTRS using:

   mysql -u root -p
   mysql> CREATE DATABASE otrs_db;
   mysql> GRANT ALL PRIVILEGES ON otrs_db.* TO 'otrs'@'localhost' IDENTIFIED BY 'password';
   mysql> FLUSH PRIVILEGES;
   mysql> exit

6. Modify '/etc/my.cnf' file as follows:

   max_allowed_packet=30M
   query_cache_size=36M
   innodb_log_file_size=256M

7. Save the file then restart MariaDB service to apply these changes

   systemctl stop mariadb
   rm -f /var/lib/mysql/ib_logfile*
   systemctl start mariadb

8. Install GCC using:

   yum install gcc -y

9. Install required PERL modules using:

   yum install bash-completion "perl(Archive::Zip)" "perl(Crypt::SSLeay)" "perl(IO::Socket::SSL)" "perl(LWP::UserAgent)" "perl(Net::DNS)" "perl(Net::LDAP)" "perl(Template)" "perl(XML::LibXML)" "perl(XML::LibXSLT)" "perl(XML::Parser)" "perl(YAML::XS)" "perl(YAML::XS)" "perl(Authen::NTLM)" "perl(Mail::IMAPClient)" "perl(JSON::XS)" "perl(Encode::HanExtra)"  "perl(DBD::Pg)" "perl(Crypt::Eksblowfish::Bcrypt)" perl-core procmail -y

10. Download OTRS from Internet. Example URL is http://ftp.otrs.org/pub/otrs/RPMS/rhel/7/otrs-6.0.6-01.noarch.rpm
11. Install OTRS using yum

    yum localinstall otrs-6.0.6-01.noarch.rpm

12. Check the missing modules by running the following script

    /opt/otrs/bin/otrs.CheckModules.pl

13. Install Missing Modules
14. Copy OTRS default configuration file

    cd /opt/otrs/Kernel
    cp Config.pm.dist Config.pm

15. Modify mysql settings in '/opt/otrs/Kernel/Config.pm' to:

    $Self->{Database} = 'otrs_db';
    $Self->{DatabaseUser} = 'otrs';
    $Self->{DatabasePw} = 'password';

16. Enable MySQL support by editing '/opt/otrs/scripts/apache2-perl-startup.pl file as:

    use DBD::mysql ();
    use Kernel::System::DB::mysql;

17. Restart Apache using:

    systemctl restart httpd

18. Start the OTRS daemon and activate its cronjob

    su - otrs -c "/opt/otrs/bin/otrs.Daemon.pl start"
    su - otrs -c "/opt/otrs/bin/Cron.sh start"

19. Open OTRS in web browser using http://<fqdn-or-ip-address>/otrs/index.pl

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