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Zeku, 1 year ago to piracy in How to automate windscribes ephemeral port update in qbittorrent?

If you happen to use gluetun (great project btw) you can use the environment property VPN_PORT_FORWARDING=on and a volume mapping to /tmp/gluetun/forwarded_port to obtain the port number from the container. Then with the bittorrent-port-forward-file container (Link) you can automatically set the port from the file to qbittorrent.
I use this with ProtonVPN and it works like a charm.

Here the relevant parts of my docker compose file:

<span style="color:#323232;">  gluetun:
</span><span style="color:#323232;">    image: qmcgaw/gluetun
</span><span style="color:#323232;">    &lt;...>
</span><span style="color:#323232;">    volumes:
</span><span style="color:#323232;">      &lt;...>
</span><span style="color:#323232;">      - ./port-forwarding/forwarded_port:/tmp/gluetun/forwarded_port:rw
</span><span style="color:#323232;">    environment:
</span><span style="color:#323232;">      # See https://github.com/qdm12/gluetun/wiki
</span><span style="color:#323232;">      &lt;...>
</span><span style="color:#323232;">      - VPN_PORT_FORWARDING=on
</span><span style="color:#323232;">      - VPN_PORT_FORWARDING_PROVIDER=protonvpn
</span><span style="color:#323232;">
</span><span style="color:#323232;">  qbittorrent-port-forward-file:
</span><span style="color:#323232;">    platform: linux/amd64 #needed for raspi
</span><span style="color:#323232;">    image: charlocharlie/qbittorrent-port-forward-file                           
</span><span style="color:#323232;">    container_name: port-forward-file                                            
</span><span style="color:#323232;">    depends_on:
</span><span style="color:#323232;">      - qbittorrent
</span><span style="color:#323232;">      - gluetun
</span><span style="color:#323232;">    restart: unless-stopped
</span><span style="color:#323232;">    volumes:
</span><span style="color:#323232;">      - ./port-forwarding:/config:ro
</span><span style="color:#323232;">    environment:
</span><span style="color:#323232;">      - QBT_USERNAME=
</span><span style="color:#323232;">      - QBT_PASSWORD=
</span><span style="color:#323232;">      - QBT_ADDR=gluetun:9092
</span><span style="color:#323232;">      - PORT_FILE=/config/forwarded_port
</span>

The file containing the port number sits at ./port-forwarding/forwarded_port on the host (you may need to create the empty file before first usage).

See gluetun wiki here: Link