generated from bisco/codex-bootstrap
Alfredo Di Stasio
37 lines
1.8 KiB
Markdown
37 lines
1.8 KiB
Markdown
# Architecture
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This project runs Traefik Proxy as a Dockerized TCP load balancer.
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## Components
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- `compose.yaml`: defines the Traefik container, published port, host-based configuration volume, container hardening, and healthcheck.
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- `config/traefik.yml`: static Traefik configuration for HTTP, TCP TLS, ping, file provider, and logging.
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- `config/dynamic/tcp-services.yml`: dynamic HTTP challenge routers, TCP routers, and backend load-balancer services.
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## Data flow
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1. A client opens a TLS connection to the Docker host on `443/tcp`.
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2. Docker forwards the connection to Traefik on container port `8443/tcp`.
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3. Traefik matches the TCP router using `HostSNI(*)`.
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4. Traefik forwards the unchanged TCP stream to one configured backend IP address and port.
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5. The selected backend terminates TLS and presents its own SSL certificate.
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For HTTP-01 certificate validation:
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1. Let's Encrypt opens an HTTP connection to the Docker host on `80/tcp`.
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2. Docker forwards the request to Traefik on container port `8080/tcp`.
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3. Traefik matches the HTTP `Host(...)` and `PathPrefix('/.well-known/acme-challenge/')` router.
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4. Traefik forwards the request to the configured local challenge responder.
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## Persistence
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Traefik configuration is stored in the host `./config` directory and mounted read-only at `/etc/traefik`.
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No certificates, private keys, application data, or Docker socket are mounted into the Traefik container.
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## Deployment topology
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Traefik runs as one Docker container on the load-balancer host. Backends are external to this Compose stack and must be reachable from the container through their configured IP addresses and ports. The Compose service defines `host.docker.internal` through Docker's `host-gateway` feature for backends that listen on the Docker host itself.
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See `docs/adr/0001-traefik-tcp-tls-passthrough.md` for the design decision.
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