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db_command_tutorial

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Database variables

NethServer comes with the most used parameters set as variables in its internal configuration databases. These variables are used to store values to be used in the final configuration files. Please, read the Database howto, the template howto and the event howtoto understand the template and database process.

These variables are useful to configure your system more easily, as you do not need to modify configuration files directly for most common cases. It also makes it possible to administer the server through its server-manager as the database variables are used to set and change configuration parameters. After editing, the configuration files must be regenerated and affected services need to be restarted.

For example, suppose you need to increase “memory-limit” in php.

You would simply execute these commands at the server console:

db configuration setprop php MemoryLimit 64
signal-event nethserver-php-save

The first line changes the value for the memory limit of PHP, the second line regenerates the configuration file and the last line will reload Apache (and subsequently also PHP as this is configured as a module of Apache).

Database parameters are case sensitive so take great care when typing at the server shell because no error messages are given should you make a typo.

The database system is based on a flat file system, but you should never edit them directly. Instead you should use the db command. More details on using the database system can be found in the Developer Manual

Setting db variables to default values

Use of 'config' is a shorthand version for 'db configuration' and therefore only works with the configuration database

Any db variable that has a default value can be reset to the default by deleting the variable entirely, then re-initializing the default database values as follows:

config delprop <key> <prop>
/etc/e-smith/events/actions/initialize-default-databases

Delete a property value

To delete the property

db accounts delprop <key> <prop>

Reset a property value

To reset to an empty value

db accounts setprop <key> <prop> <nowiki>''</nowiki>
db_command_tutorial.1432286259.txt.gz · Last modified: 2019/06/05 21:48 (external edit)