this post was submitted on 14 Dec 2025
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So I'm learning python (by doing, reading, and doing some more), and I've been wanting to automate updating the listening port in my qbittorrent docker container when the gluetun vpn container changes the forwarded port.

This is what I came up with, which I combined with an hourly cronjob to keep it the listen port updated.

(Code under the spoiler tag to make this more readable).

Tap for spoiler

import re
import os
import logging
from datetime import datetime
from dotenv import load_dotenv

import docker
from qbittorrent import Client

# FUNCTION DECLARATION #


def log(code, message):
    logFilePath = "/opt/pyprojects/linux-iso-torrents/pf.log"
    logDateTime = datetime.today().strftime("%Y-%m-%d %H:%M:%S")
    message = f"[{logDateTime}] {message}"
    logger = logging.getLogger(__name__)
    logging.basicConfig(
        filename=f"{logFilePath}", encoding="utf-8", level=logging.DEBUG
    )
    match code:
        case "debug":
            logger.debug(message)
        case "info":
            logger.info(message)
        case "warning":
            logger.warning(message)
        case "error":
            logger.error(message)


def get_current_forwarded_port():
    client = docker.from_env()
    container = client.containers.get("a40124291102d")
    logs = container.logs().decode("utf-8")
    allPortForwards = re.findall(r".+port forwarded is [0-9]{5}", logs)
    currentForwardedPort = allPortForwards[-1].split(" ")[-1]

    return currentForwardedPort


def get_current_listening_port():
    qbConfigUrl = "/home/server/docker/qbit/config/qBittorrent/qBittorrent.conf"
    with open(qbConfigUrl) as f:
        config = f.read()
        qbitListenPort = re.search(r"Session\\Port=[0-9]{5}", config)
        currentListeningPort = qbitListenPort.group(0).split("=")[-1]

    return currentListeningPort


def update_qbittorrent_listen_port(port):
    QB_URL = os.getenv("QB_URL")
    QB_USER = os.getenv("QB_USER")
    QB_PASSWORD = os.getenv("QB_PASSWORD")
    portJSON = {}
    portJSON["listen_port"] = port
    qb = Client(QB_URL)
    qb.login(f"{QB_USER}", f"{QB_PASSWORD}")

    qb.set_preferences(**portJSON)


# BEGIN SCRIPT #

load_dotenv()

currentForwardedPort = get_current_forwarded_port()
currentListeningPort = get_current_listening_port()

if currentForwardedPort != currentListeningPort:
    update_qbittorrent_listen_port(currentPort)
    log("info", f"qbittorrent listen port set to {currentForwardedPort}")
else:
    log("info", "forwarded port and listen port are a match")

There's more I want to do, the next thing being to check the status of both containers and if one or both are down, to log that and gracefully exit, but for now, I'm pretty happy with this (open to any feedback, always willing to learn).

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[–] harsh3466@lemmy.ml 3 points 2 months ago* (last edited 2 months ago) (1 children)

I did run across the qbittorrent-natpmp when I was looking into how to change the port via the api, but wanted to work out the process myself (not because of NIH, but for the learning of figuring it all out).

I had no idea about the up/down command in gluetun! That's very nice. I'm going to look into that for sure.

Thank you!

[–] MalReynolds@piefed.social 1 points 2 months ago (1 children)

Cool stuff, I've been using https://github.com/SnoringDragon/gluetun-qbittorrent-port-manager but it's 2 years old and intermittent in functionality (works sometimes, check it if you haven't). Will keep an eye on yours.

If you're up for a challenge flaresolvarr is always in a cat and mouse game with cloudflare if that's your idea of fun.

Well Done!

[–] harsh3466@lemmy.ml 1 points 2 months ago

Thank you! I'm gonna take a look at flaresolvarr too.