.. component_exercises:

Exercises
=========

Components and Services
-----------------------

.. note:: Hint, if ``bash-completion`` is installed, try <TAB><TAB> to get completions.

#. start/stop services
      .. code-block:: console

        $ sudo service apache2
        $ sudo service apache2 reload
        $ sudo service tomcat7
        $ sudo service postgresql
#. basic psql interactions
      .. code-block:: console

        $ sudo su - postgres
        $ psql
        => help                 # get help
        => \?                   # psql specific commands
        => \l                   # list databases
        => \c geonode           # switch database
        => \ds                  # list tables
        => \dS layers_layer     # describe table

OGC Standards
-------------

WMS
...

#. Use the layer preview functionality in GeoServer to bring up a web map.
#. Copy a the URL for the image in the map.
#. Alter URL parameters for the request.
#. Use *curl* to get the capabilities document

  .. code-block:: console

    $ curl 'http://localhost/geoserver/wms?request=getcapabilities'

More: http://docs.geoserver.org/stable/en/user/services/wms/index.html

WFS
...

#. Describe a feature type using curl (replace ws:name with your layer)

  .. code-block:: console
  
    $ curl 'http://localhost/geoserver/wfs?request=describefeaturetype&name=ws:name

More: http://docs.geoserver.org/stable/en/user/services/wfs/reference.html