used this comment https://www.reddit.com/r/kubernetes/comments/10b9ana/comment/j491dzl/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Specifically with gluetun you must add an environment variable called FIREWALL_INPUT_PORTS. The value is a comma separated list of ports which are in the same pod as the vpn sidecar. I.e if you have nginx exposing port 80 add port 80 to FIREWALL_INPUT_PORTS. Docs I found this at: https://github.com/qdm12/gluetun/wiki/Firewall-options

Gluetun fonctionne avec l'option du port