NetBox Python API - Check licenses expiration

netbox-licenses-expiration-check.py

import pynetbox
import requests
import datetime
from dateutil.relativedelta import relativedelta

nb = pynetbox.api(
    "https://netbox.domain.net",
    token="mysecret",
)

# uncomment below if self-signed cert is used
# session = requests.Session()
# session.verify = False
# nb.http_session = session

# getting next month's date in format YYYY-MM (2021-08)
today = datetime.date.today()
next_month = (today + relativedelta(months=1)).strftime("%Y-%m")

print("Checking licenses expiring during : " + next_month)

# modify this according to what is stored in your devices on netbox.
# we are looking in the "comments" field for a string "licenses-expiration:YYYY-MM-DD"
# for example : licenses-expiration:2021-09-30
prefix = "licenses-expiration:"

# we gather all devices that have licenses expiring next month
devices = nb.dcim.devices.filter(prefix + next_month)

# we print the name and licenses expiring date of each device gathered
for device in devices:
    print(device.name + " licenses are expiring on " + device.comments[len(prefix):])