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'],
]
```

---

## BANNER_TOP

## BANNER_BOTTOM

Setting these variables will display content in a banner at the top and/or bottom of the page, respectively. To replicate the content of the top banner in the bottom banner, set:

```
BANNER_TOP = 'Your banner text'
BANNER_BOTTOM = BANNER_TOP
```

---

## BASE_PATH

Default: None

The base URL path to use when accessing NetBox. Do not include the scheme or domain name. For example, if installed at http://example.com/netbox/, set:

```
BASE_PATH = 'netbox/'
```

---

## CORS_ORIGIN_ALLOW_ALL

Default: False

If True, cross-origin resource sharing (CORS) requests will be accepted from all origins. If False, a whitelist will be used (see below).

---

## CORS_ORIGIN_WHITELIST

## CORS_ORIGIN_REGEX_WHITELIST

These settings specify a list of origins that are authorized to make cross-site API requests. Use `CORS_ORIGIN_WHITELIST` to define a list of exact hostnames, or `CORS_ORIGIN_REGEX_WHITELIST` to define a set of regular expressions. (These settings have no effect if `CORS_ORIGIN_ALLOW_ALL` is True.)

---

## 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

---

# ENFORCE_GLOBAL_UNIQUE

Default: False

Enforcement of unique IP space can be toggled on a per-VRF basis. To enforce unique IP space within the global table (all prefixes and IP addresses not assigned to a VRF), set `ENFORCE_GLOBAL_UNIQUE` to True.

---

## LOGGING

By default, all messages of INFO severity or higher will be logged to the console. Additionally, if `DEBUG` is False and email access has been configured, ERROR and CRITICAL messages will be emailed to the users defined in `ADMINS`.

The Django framework on which NetBox runs allows for the customization of logging, e.g. to write logs to file. Please consult the [Django logging documentation](https://docs.djangoproject.com/en/1.11/topics/logging/) for more information on configuring this setting. Below is an example which will write all INFO and higher messages to a file:

```
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'file': {
            'level': 'INFO',
            'class': 'logging.FileHandler',
            'filename': '/var/log/netbox.log',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['file'],
            'level': 'INFO',
        },
    },
}
```

---

## 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.

---

## MAX_PAGE_SIZE

Default: 1000

An API consumer can request an arbitrary number of objects by appending the "limit" parameter to the URL (e.g. `?limit=1000`). This setting defines the maximum limit. Setting it to `0` or `None` will allow an API consumer to request all objects by specifying `?limit=0`.

---

## 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
```
