netbox-webhook-nxapi

This repo provides an example of how one might update NX-OS interfaces using Netbox's webhook feature.

The flow goes something like:

Netbox-->WebhookServer-->update_interface.bash-->nxapi_config.py-->NexusSwitch

In our example, we update the following interface configurations:

• description
• vlan
• mtu
• interface state (shutdown or not)

Getting started

If you've never used webhooks before, below is a quick-start guide.

1. Install webhook. If using Ubuntu, and prefer snaps, then:

sudo snap install webhook

else:

sudo apt install webhook

2. cd into the directory where you downloaded this repo

3. Edit update-interface.bash

Change the following with your NX-OS username and password:

PASSWORD='your_nxos_password'
USERNAME='admin'

4. Optionally, update your PYTHONPATH

If you move nxapi.py to a different location, add that location to your PYTHONPATH; either in update-interface.bash, or in your .bash_profile, etc.

5. Edit hooks.json

Change execute-command to point to where update-interface.bash lives on your server.

"execute-command": "/home/arobel/netbox-webhook-nxapi/update-interface.bash",

Change command-working-directory to this repo's directory on your server.

"command-working-directory": "/home/arobel/netbox-webhook-nxapi",

6. Start webhook

Specify the port you'll configure Netbox to use (8888 in the below examples)

If using the snap version:

snap run webhook -hooks hooks.json -port 8888 -verbose

Else, if installed using apt:

webhook -hooks hooks.json -port 8888 --verbose

7. Configure Netbox

We'll configure Netbox below to trigger a webhook if dcim.interfaces changes

• In the Netbox sidebar, scroll down and click "Other" then "Webhooks"
• Click "Add" in the Webhooks pane.
• For Name* use update-interface
• For Content Types* select DCIM > interface from the drop-down menu
• Make sure Enabled is checked.
• Under Events, check Creations and Updates
• For URL*, use http://your_server:8888/hooks/update-interface

Replace your_server with the hostname or ip address of your server. Replace 8888 with the port you used in step 5 above.

• Make sure HTTP Method* is POST
• Make sure HTTP content type* is application/json
• Scroll down to the bottom of the page and click Save

8. Update an interface in Netbox

If you do this manually, follow the steps below. Else, if you'd like to try my netbox-tools, you can use the interface_create_update.py script. Below is an example for that:

./interface_create_update.py --device cvd_leaf_1 --interface Ethernet1/1 --mode access --type 1000base-x-sfp --vlan 20 --description "DB Servers" --mtu 9216 --disabled

• Read the Netbox documentation for adding devices and interfaces if you don't already have a device/interface configured.
• Under Devices in the Netbox sidebar, select Interfaces (or select a device and then select its interface from the device interface tab)
• Click the interface to edit (in this case, we are configuring the vlan on access mode interfaces, so select an access interface)
• Make change(s) to the interface (one or more of Description, MTU, Enabled, or Untagged VLAN)
• Click Save

9. Check that the webhook fired

Go back to your terminal where you started webhook. You should see some output that looks similar to:

[webhook] 2022/10/06 18:34:21 Started POST /hooks/update-interface
[webhook] 2022/10/06 18:34:21 [075319] incoming HTTP request from A.B.C.D:40284
[webhook] 2022/10/06 18:34:21 [075319] update-interface got matched
[webhook] 2022/10/06 18:34:21 [075319] update-interface hook triggered successfully
[webhook] 2022/10/06 18:34:21 Completed 200 OK in 391.854µs
[webhook] 2022/10/06 18:34:21 [075319] executing /home/admin1/arobel/netbox-webhook-nxapi/update-interface.bash (/home/admin1/arobel/netbox-webhook-nxapi/update-interface.bash) with arguments ["/home/admin1/arobel/netbox-webhook-nxapi/update-interface.bash" "cvd_leaf_1" "Ethernet1/1" "10" "Web Servers" "9216" "false"] and environment [] using /home/admin1/arobel/netbox-webhook-nxapi as cwd
[webhook] 2022/10/06 18:34:26 [075319] command output: 
[webhook] 2022/10/06 18:34:26 [075319] finished handling update-interface

10. Check the NX-OS switch manually

• Verify the interface configuration changed show running-config interface X/Y
• Verify the accounting log show accounting log