serverAppConfigs/docs/Infrastructure/Caddy.md

Caddy

Caddy is the single reverse proxy for both hosts. It runs as a container on Dankclaw (192.168.0.143), terminates TLS with real Let's Encrypt certificates, routes hostnames to containers on both hosts, and protects the homepage and sensitive services with HTTP basic auth.

Docs: https://caddyserver.com/docs

Facts (live inventory)

Item	Value
Image	franksdank/caddy-porkbun:latest (local build, dankclaw/caddy/Containerfile)
Config	/home/dank/Containers/caddy/Caddyfile (bind mount, rendered by deploy)
Data	/home/dank/Containers/caddy/data (certs) and .../config (ACME state)
Ports	80, 443 on 192.168.0.143
TLS	Let's Encrypt, DNS-01 via the Porkbun module (one cert per vhost)
Runs on	Dankclaw only — Dankserver has no Caddy

The Caddyfile in git (dankclaw/Caddyfile) carries a REPLACE_WITH_HASH placeholder. scripts/deploy.sh renders the real basicauth hash from the host .env (CADDY_BASICAUTH_HASH) into the mounted path before up. See Deployment Flow.

The porkbun image

Stock Caddy cannot solve the ACME challenge because the router exposes no inbound port 80/443. The local image adds the github.com/caddy-dns/porkbun module, which answers the DNS-01 challenge by creating and deleting a _acme-challenge TXT record through the Porkbun API. No inbound port is needed. Rebuild only when Caddy or the module needs an update:

podman build -t franksdank/caddy-porkbun:latest -f dankclaw/caddy/Containerfile .

The Caddyfile references the credentials through the environment:

acme_dns porkbun {
    api_key {env.PORKBUN_API_KEY}
    api_secret_key {env.PORKBUN_API_SECRET_KEY}
}

compose passes both variables from the host .env. Keep the real keys in .env only; .env.example holds placeholders. The Porkbun account holds only franksdank.cloud.

Vhost map

Every vhost uses the flat franksdank.cloud convention. The full list lives in dankclaw/Caddyfile. Routing by host:

Upstream	Reach
Dankclaw services (compose network)	by container name, e.g. comfyui:8188
Dankclaw quadlet services	by published LAN port, e.g. 192.168.0.143:3000 (Gitea)
Dankserver services	by published LAN port, e.g. 192.168.0.235:8085 (RomM)

The bare-IP catch-all :80 302-redirects to https://dankclaw.franksdank.cloud/. The legacy name dankserver.franksdank.cloud 302-redirects there too. plex.franksdank.casa is the only plain-HTTP vhost; it cannot get a DNS-01 cert because franksdank.casa is not in the Porkbun account. The canonical Plex name is plex.franksdank.cloud.

Basic auth

The Caddyfile in git carries a bare placeholder; deploy.sh substitutes the full hash from the host .env (CADDY_BASICAUTH_HASH):

chat.franksdank.cloud {
    basicauth {
        dank REPLACE_WITH_HASH
    }
    reverse_proxy 192.168.0.143:3005
}

After rendering, the line reads dank $2a$14$xxxx… (one complete hash). Do not put a $2a$14$ prefix in the template: it would render a double-prefixed, invalid hash (2026-08-22 incident — every basicauth vhost returned 401 for every password). tests/deployment_flow.bats pins the render contract.

The homepage (and SearXNG, Hermes, Prometheus, RomM, Copyparty) use forward_auth (Authentik SSO) rather than basicauth; see Homepage and Authentik. The basicauth hash above is still rendered for the vhosts that keep it (Grafana, Pi-hole).

Operations

Validate before a reload:

caddy validate --config /etc/caddy/Caddyfile --adapter caddyfile

The admin endpoint stays on (loopback-only, unpublished port), so a Caddyfile change hot-reloads within seconds via the file watcher. deploy.sh also issues an explicit reload after rendering. Manual reload from the host:

podman exec caddy caddy reload --config /etc/caddy/Caddyfile --adapter caddyfile

Certificates and ACME state live in the caddy data volume. Back it up with the stack. Each vhost owns one certificate; renewals are automatic and also use DNS-01.

Gotchas

• admin off disables the config file watcher: rendered changes then sit on disk while Caddy serves its stale in-memory config until the container is recreated, and nothing logs an error (2026-08-22: a broken basicauth hash survived several deploys this way). tests/caddyfile.bats forbids admin off.
• The basicauth template must stay a bare REPLACE_WITH_HASH token (no $2a$14$ prefix) — the rendered value is the complete hash. A double prefix silently rejects every password with 401; no Caddy error is logged.
• A new vhost needs three things: a Pi-hole addn-hosts line, a Porkbun A record, and the Caddyfile block. See LAN-DNS.
• The G36 has no NAT loopback, so LAN clients must resolve the name to the LAN IP. That is the Pi-hole role in LAN-DNS.
• Caddy serves HTTPS on 443 and HTTP on 80 (redirects). The router needs no 80/443 port forward for LAN use.

See Also

• LAN-DNS — how names resolve on the LAN and WAN
• Network Architecture — topology, access policy
• Homepage
• Dankclaw Stack