=head1 NAME

YATG::Tutorial - A simple YATG tutorial

=head1 DESCRIPTION

This tutorial will teach you how to set up L<YATG> using a very simple
configuration.

=head1 CREATING A SIMPLE CONFIGURATION

Although we could use "any" configuration format, let's start with a
simple L<YAML> configuration file:

    ---
    yatg:
        oids:
            "sysUpTime":            [disk]
            "ifHCInOctets":         [ifindex, disk]
            "ifHCOutOctets":        [ifindex, disk]
        communities: [public]
        disk_root: '.' 
        dbi_connect:
            - "dbi:SQLite:database.db"
        dbi_ip_query: 'select ip from device;'

=head2 oids

This configuration file lists a few oids (C<sysUpTime>, C<ifHCInOctets>,
C<ifHCOutOctets>), and describes how to store each one (C<disk>).

It's important to note that some oids represent scalar values (for
instance, C<sysUpTime>), while others represent arrays. For instance,
C<ifHCInOctets> may refer to several interfaces in the same machine:
C<ifHCInOctets.0>, C<ifHCInOctets.1>, and so on.

You should hint L<YATG> about these indexed interfaces, with the keyword
C<ifindex>.

=head2 communities

This is a list of community strings recognized by the monitored networks.
In our case we'll use the default "public" community string.

=head2 disk_root

This configuration item specifies the root of the "disk" storage. By
default it is C</var/lib/yatg>, but we'll use the current directory
('C<.>') instead.

=head2 dbi_connect and dbi_ip_query

YATG uses an external database to store a list of IPs. By default it uses
NetDisco schema; but NetDisco requires additional setup and configuration,
so we'll use a simpler SQLite database, consisting of a single table.

=head1 CREATING A SOURCE DATABASE USING SQLITE

L<YATG> uses a database to store the list of IPs it will monitor. We'll use
the following script to create such a database, using SQLite:

 CREATE TABLE device (
     id INTEGER AUTO_INCREMENT PRIMARY KEY,
     ip VARCHAR(15)
 );
 
 INSERT INTO device (id, ip) VALUES (1, '127.0.0.1');

Save this file as "database.sql" and create the database with the command:

 sqlite3 database.db < database.sql

If no problems occur, you can start YATG.

=head1 STARTING YATG

By now, you should have the following files in your working directory:

 config.yaml  # configuration file
 database.sql # sql schema
 database.db  # database file

Just execute yatg_updater, using the configuration file as parameter:

 yatg_updater config.yaml

YATG will store the information gathered via SNMP in a sub-directory called
C<127.0.0.1>.

=head1 TROUBLESHOOTING

The "disk" storage requires L<Tie::File::FixedRecLen>. Make sure you have
this module installed.

=head1 SEE ALSO

=over 4

=item L<YATG>

=item L<YATG::Config>

=item L<http://www.sqlite.org/>

=back

=head1 AUTHOR

Nelson Ferraz C<< <nferraz@gmail.com> >>

=head1 ACKNOWLEDGMENTS

Thanks to Oliver Gorwits who created L<YATG>.

=head1 COPYRIGHT & LICENSE

Copyright (c) 2007 Nelson Ferraz. All Rights Reserved.

This documentation is free; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut