## Configuring IDO

The IDO (Icinga Data Output) modules for Icinga 2 takes care of exporting all
configuration and status information into a database. The IDO database is used
by a number of projects including Icinga Web.

There is a separate module for each database back-end. At present support for
both MySQL and PostgreSQL is implemented. This installation guide assumed that
you are using MySQL.

> **Note**
>
> Icinga 2 uses the Icinga 1.x IDOUtils database schema starting with version
> `1.11.0`.

### Setting up the database

First of all you have to install the `icinga2-ido-mysql` package using your
distribution's package manager. Once you have done that you can proceed with
setting up a MySQL database for Icinga 2:

> **Note**
>
> The Debian packages can optionally create and maintain the database for you
> using Debian's `dbconfig` framework. This is the recommended way of setting up
> the database.

    # mysql -u root -p

    mysql> CREATE DATABASE icinga;
    Query OK, 1 row affected (0.01 sec)

    mysql>  GRANT USAGE ON icinga.* TO 'icinga'@'localhost'
              IDENTIFIED BY 'icinga'
              WITH MAX_QUERIES_PER_HOUR 0
              MAX_CONNECTIONS_PER_HOUR 0
              MAX_UPDATES_PER_HOUR 0;

    mysql>  GRANT SELECT, INSERT, UPDATE, DELETE, DROP, CREATE VIEW, INDEX, EXECUTE
              ON icinga.* TO 'icinga'@'localhost';

    mysql>  FLUSH PRIVILEGES;

    mysql> quit

After creating the database you can import the Icinga 2 IDO schema using the
following command:

    # mysql -u root -p icinga < /usr/share/doc/icinga2-ido-mysql-*/schema/mysql.sql

> **Note**
>
> The Icinga 2 RPM packages install the schema files into
> `/usr/share/doc/icinga2-ido-mysql-*/schema` (`*` means package version).
> The Icinga 2 dist tarball ships the schema files in `components/db_ido_mysql/schema/`.
>
> On SuSE-based distributions the schema files are installed in
> `/usr/share/doc/packages/icinga2-ido-mysql/schema`.

### Upgrading the database

If the database has been installed and requires an upgrade, verify the current
schema version first:

    # mysql -u root -p icinga -e 'SELECT version FROM icinga_dbversion;'
    +---------+
    | version |
    +---------+
    | 1.10.0  |
    +---------+

Check the `schema/upgrade` directory for an incremental schema upgrade file, e.g.
if your database schema version is `1.10.0` look for `mysql-upgrade-1.11.0.sql`
and newer.
Apply all database schema upgrade files incrementially.

    # mysql -u root -p icinga < /usr/share/doc/icinga2-ido-mysql-*/schema/upgrade/mysql-upgrade-1.11.0.sql

> **Note**
>
> The Icinga 2 IDO module will check for the required database schema version
> on startup and generate an error message if not satisfied.

### Installing the IDO module

The package provides a new configuration file that is installed in
`/etc/icinga2/features-available/ido-mysql.conf`. You will need to update the
database credentials in this file.

You can enable the `ido-mysql` feature configuration file using `icinga2-enable-feature`:

    # icinga2-enable-feature ido-mysql
    Module 'ido-mysql' was enabled.
    Make sure to restart Icinga 2 for these changes to take effect.

After enabling the ido-mysql feature you have to restart Icinga 2:

    # /etc/init.d/icinga2 restart