The in-cluster Gluetun-pod gateway (ADR-0013) cannot be steered: a pod's tun0 is
invisible to the node datapath, and hostNetwork Gluetun hijacks the node's own
default route (breaks k3s/etcd). The tunnel itself works (PIA egress validated),
but not the steering.
New decision (ADR-0015): move the tunnel to a HOST OpenVPN systemd service on
egress-gateway node(s) (Ansible-managed, split-tunnel so it doesn't touch the node
default route), steer egress-class=vpn pods with a CiliumEgressGatewayPolicy (native
eBPF, no client-pod changes), and enforce the kill-switch with a host nftables rule
(fail-closed independent of Cilium). PIA/OpenVPN-UDP provider decision (ADR-0013)
stands; the .ovpn transfers over; PF re-solved host-side (Phase 6).
Amended for consistency: ADR-0013 (client+steering superseded), decisions/README,
docs/00, docs/01, docs/03, docs/07, agents/task-board.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
jakman85andClaude Opus 4.8
7598cff945