DNS lookup fails within Gluetun

[vincentkelleher]

Hi 👋

I've setup a basic Kubernetes pod with qBittorrent and Gluetun cohabiting within. I've tested multiple VPNs such as AirVPN, Mullvad and NordVPN using Wireguard and OpenVPN.

The VPN connection is working fine but I can't seem to get the DNS working on both containers.

Failing Scenario

The failing configuration is the following (VPN settings omitted as they are out-of-scope):

BLOCK_MALICIOUS: 'off'
DOT: 'on'
DOT_IPV6l: 'off'

When I try to run apk update on both the Gluetun and the qBittorrent containers, it fails and says it cannot reach dl-cdn.alpinelinux.org. I'm currently running some bandwidth tests so I didn't provide the precise error log but I can provide it if it's relevant although it just states the host is not resolvable.

wget acts the same way as apk but curl seems to work 🤷

I keep getting messages such as:

• Host not found (authoritative) on qBittorrent's tracker view
• Failed name has no usable address
• Bad address

Temporary Fix

As a temporary fix, I've tried enabling IPv6 and fiddling with multiple settings but the only solution was to disable the DNS part of Gluetun by using the following configuration:

DOT: 'off'

Everything works perfectly after this.

I'm wonder if I'm the only one encountering this issue 🤔

Thanks for your help 🙏