8.6. Network And Routing Topology

Host ports, Kong aliases, direct service ports, backend-network-only services, and localhost-mode boundaries.

1. Diagram

Open the full-size diagram.

2. Notes

The host-gateway address depends on the runtime; it is not a fixed IP. Docker resolves the literal host-gateway value in extra_hosts itself. Podman has no such shortcut: resolve_host_gateway_ip() in bootstrapper/utils/system.py queries the default bridge network's IPAM gateway, then falls back to a throwaway container. Localhost-source endpoints always name host.docker.internal, which each reading container maps to that gateway (#1361).

3. Source Files

• bootstrapper/utils/kong_config_generator.py
• bootstrapper/utils/system.py
• bootstrapper/services/topology.py
• services/kong/service.yml