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netbox-community-netbox/docs/features/configuration-rendering.md

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# Configuration Rendering
One of the critical aspects of operating a network is ensuring that every network node is configured correctly. By leveraging configuration templates and [context data](./context-data.md), NetBox can render complete configuration files for each device on your network.
```mermaid
flowchart TD
ConfigContext & ConfigTemplate --> Config{{Rendered configuration}}
click ConfigContext "../../models/extras/configcontext/"
click ConfigTemplate "../../models/extras/configtemplate/"
```
## Configuration Templates
Configuration templates are written in the [Jinja2 templating language](https://jinja.palletsprojects.com/), and may be automatically populated from remote data sources. Context data is applied to a template during rendering to output a complete configuration file. Below is an example template.
```jinja2
{% extends 'base.j2' %}
{% block content %}
system {
host-name {{ device.name }};
domain-name example.com;
time-zone UTC;
authentication-order [ password radius ];
ntp {
{% for server in ntp_servers %}
server {{ server }};
{% endfor %}
}
}
{% for interface in device.interfaces.all() %}
{% include 'common/interface.j2' %}
{% endfor %}
{% endblock %}
```
When rendered for a specific NetBox device, the template's `device` variable will be populated with the device instance, and `ntp_servers` will be pulled from the device's available context data. The resulting output will be a valid configuration segment that can be applied directly to a compatible network device.