Delete unused subnets

urlcurl -O https://wissen.woitzel.eu/unused_subnets.py && python3 unused_subnets.py -k

What it does

Connects to one Prism Central, lists every subnet (with its cluster) that no VM NIC points to and optionally deletes the ones you mark. Python 3 only, no extra modules.

Usage

python3 unused_subnets.py [--host HOST] [--user USER] [-k] [--csv FILE] [--list-only]

# ask for host, user and password
python3 unused_subnets.py

# everything on the command line
python3 unused_subnets.py --host pc.example.local --user admin -k

# read-only: list and save as CSV, never offer to delete
python3 unused_subnets.py --host pc.example.local --user admin -k --list-only --csv unused.csv

Options

Option	Description

--host HOSTPrism Central (host/IP); asked for if missing --user USERUser; else NTNX_USER, else asked for -k, --insecureDo not verify the TLS certificate (self-signed) --csv FILEAlso save the list as CSV --list-onlyOnly list, never offer to delete -h, --helpShow the built-in help

Password

Prompted (no echo). Never passed as argument, never stored. Alternatively set NTNX_PASSWORD (and NTNX_USER).

Mark and delete

After the list the script asks Mark subnets for deletion? [y/N]. Then:

Key	Action

Up / DownMove SpaceMark / unmark and move on aMark all / none EnterContinue with the marked subnets qQuit without deleting

The marked subnets are shown again and need a final Delete these N subnet(s) now? [y/N] (default: no). Right before deleting the VMs are read again; a subnet that got a VM in the meantime is skipped. Subnets are deleted one by one, each with OK / FAIL.

Notes

A VM counts whether it is powered on or off. Subnets are matched by UUID, so identical names on different clusters are not mixed up. Other consumers of a subnet (Files, Karbon, templates) are not checked. Prism may refuse such a delete - it shows up as FAIL. Without a terminal (pipe) or with --list-only the script only lists; nothing is deleted.