netbox-community-netbox/docs/configuration/optional-settings.md

The following are optional settings which may be declared in `netbox/netbox/configuration.py`.

## ADMINS

NetBox will email details about critical errors to the administrators listed here. This should be a list of (name, email) tuples. For example:

```
ADMINS = [
    ['Hank Hill', 'hhill@example.com'],
    ['Dale Gribble', 'dgribble@example.com'],
]
```

---

## DEBUG

Default: False

This setting enables debugging. This should be done only during development or troubleshooting. Never enable debugging on a production system, as it can expose sensitive data to unauthenticated users. 

---

## EMAIL

In order to send email, NetBox needs an email server configured. The following items can be defined within the `EMAIL` setting:

* SERVER - Host name or IP address of the email server (use `localhost` if running locally)
* PORT - TCP port to use for the connection (default: 25)
* USERNAME - Username with which to authenticate
* PASSSWORD - Password with which to authenticate
* TIMEOUT - Amount of time to wait for a connection (seconds)
* FROM_EMAIL - Sender address for emails sent by NetBox

---

## LOGIN_REQUIRED

Default: False,

Setting this to True will permit only authenticated users to access any part of NetBox. By default, anonymous users are permitted to access most data in NetBox (excluding secrets) but not make any changes.

---

## MAINTENANCE_MODE

Default: False

Setting this to True will display a "maintenance mode" banner at the top of every page.

---

## NETBOX_USERNAME

## NETBOX_PASSWORD

If provided, NetBox will use these credentials to authenticate against devices when collecting data.

---

## PAGINATE_COUNT

Default: 50

Determine how many objects to display per page within each list of objects.

---

## PREFER_IPV4

Default: False

When determining the primary IP address for a device, IPv6 is preferred over IPv4 by default. Set this to True to prefer IPv4 instead.

---

## TIME_ZONE

Default: UTC

The time zone NetBox will use when dealing with dates and times. It is recommended to use UTC time unless you have a specific need to use a local time zone. [List of available time zones](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones).

---

## Date and Time Formatting

You may define custom formatting for date and times. For detailed instructions on writing format strings, please see [the Django documentation](https://docs.djangoproject.com/en/dev/ref/templates/builtins/#date).

Defaults:

```
DATE_FORMAT = 'N j, Y'               # June 26, 2016
SHORT_DATE_FORMAT = 'Y-m-d'          # 2016-06-27
TIME_FORMAT = 'g:i a'                # 1:23 p.m.
SHORT_TIME_FORMAT = 'H:i:s'          # 13:23:00
DATETIME_FORMAT = 'N j, Y g:i a'     # June 26, 2016 1:23 p.m.
SHORT_DATETIME_FORMAT = 'Y-m-d H:i'  # 2016-06-27 13:23
```