Documentation about setting the database connection

[etj]

The documentation at https://docs.geonode.org/en/master/devel/installation/ reports about creating a local_settings.py file, but it is not used when running the migrate command line or when starting the application.

It should be documented that, if you have your local_settings.py, you should run the commands with the
DJANGO_SETTINGS_MODULE env var set.

You can set it locally on the command line running the command, such like:

DJANGO_SETTINGS_MODULE=geonode.local_settings python manage.py migrate

and

DJANGO_SETTINGS_MODULE=geonode.local_settings paver start

Also, in the section documenting the customization of the DB, the sample snippet reports:

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'geonode_dev',
    'USER': 'geonode_dev', 

but if you replace the default

'ENGINE': 'django.contrib.gis.db.backends.postgis',

with

'ENGINE': 'django.db.backends.postgresql_psycopg2',

you'll get the error

AttributeError: 'DatabaseOperations' object has no attribute 'geo_db_type'

during the migration command.

[etj]

The info

is only reported in this page: https://docs.geonode.org/en/master/install/advanced/core/index.html#update-the-settings-in-order-to-use-the-postgresql-database

[t-book]

@etj as this is regarding docs I've transferred the issue. Your contribution is very welcome ;)