Configuration manager for network devices
Homer allows to manage the lifecycle of the configuration for network devices, generating and deploying their configuration.
The configuration generation is based on YAML files to define variables and Jinja2 templates. The YAML files allow for hierarchical override of variables based on the device role, site or hostname. Once generated, the configuration can be deployed to the selected devices.
The device list can either live hardcoded in the configuration files or be dynamically gathered from Netbox. When using Netbox as inventory both the Virtual Chassis endpoint and the Device endpoint are used to select all the devices that matches the configured whitelist of device roles and statuses.
Also when using Netbox as inventory for each device additional metadata is exposed to the templates, namely:
- role: device role slug
- site: device site slug
- type: device type slug
- ip4: primary IPv4 without netmask
- ip6: primary IPv6 without netmask
- netbox_object: the Netbox device object. Directly exposed data should always be preferred in templates. It is exposed to not be a blocker in case some additional data is needed that is not yet exposed by Homer explicitely. It could be removed in a future release.
When using Netbox to gather dynamic configuration, it’s also possible to write a custom plugin in the form of a Python module that implements a class called NetboxDeviceDataPlugin that inherits from homer.netbox.BaseNetboxDeviceData and is in the Python PATH. Assuming that the plugin class implements a method named _get_name, it will be accessible within the templates with netbox.device_plugin.name.
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