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Extracts the file-based deploy target connectors: - haproxy.md (107 lines) — combined-PEM (cert+chain+key) deploy with haproxy -c validate; multi-frontend + crt-list directory guidance - traefik.md (105 lines) — file-provider zero-reload deploy; file watcher latency notes; mixing with built-in ACME guidance - caddy.md (100 lines) — admin API mode (recommended) vs file mode; admin-API exposure threat model - envoy.md (112 lines) — file SDS mode (recommended) vs static bootstrap; service-mesh interactions - postfix.md (175 lines) — dual-mode (Postfix MTA / Dovecot IMAPS) connector with daemon-specific quirks (STARTTLS chain expectations, no shared session cache); Bundle 11 test pins Index forward-list expanded to enumerate all 10 target connectors (5 from Phase 4 structural + 5 from this batch) in alphabetical order. This is part 3 of 4 for the Phase 4 follow-on (per-connector page extraction) tracked in cowork/docs-overhaul-phase-2-restructure-2026-05-04/log.md. Net add: 5 files, 599 lines. No content removed from index.md.
101 lines
3.2 KiB
Markdown
101 lines
3.2 KiB
Markdown
# Caddy Connector — Operator Deep-Dive
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> Last reviewed: 2026-05-05
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>
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> Operator-grade documentation for the Caddy target connector. For
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> the connector-development context (interface contract, registry,
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> atomic deploy primitive shared across all targets), see the
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> [connector index](index.md).
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## Overview
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The Caddy connector supports two deployment modes:
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- **API mode (recommended).** Posts the certificate directly to
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Caddy's admin API for zero-downtime hot reload.
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- **File mode (fallback).** Writes cert and key files to disk,
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relying on Caddy's built-in file watcher or a manual reload.
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Implementation lives at `internal/connector/target/caddy/`.
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## When to use this connector
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Use the Caddy connector when:
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- Caddy fronts your services and you want certctl-managed certs
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rather than letting Caddy run its own ACME client.
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- You want zero-downtime hot reload via Caddy's admin API.
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Look elsewhere when:
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- You'd rather Caddy keep running its own ACME client — point it
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at certctl's ACME server (see
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[migration/acme-from-caddy.md](../../migration/acme-from-caddy.md))
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for the cleanest pattern.
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## Configuration
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```json
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{
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"mode": "api",
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"admin_api": "http://localhost:2019",
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"cert_dir": "/etc/caddy/certs",
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"cert_file": "site.crt",
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"key_file": "site.key"
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}
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```
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When `mode` is `"api"`, the connector posts the certificate to
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the admin API endpoint. When `mode` is `"file"`, it writes files
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to `cert_dir` (same pattern as Traefik). The `admin_api` field is
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ignored in file mode.
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## Mode trade-offs
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### API mode
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- Zero-downtime hot reload via `POST /load` or
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certificate-specific endpoints.
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- Requires Caddy's admin API to be enabled and reachable from the
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deployment agent.
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- Best fit for production deployments where Caddy is configured
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with an admin endpoint.
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### File mode
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- Writes cert and key files to `cert_dir`; Caddy picks them up
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via its file watcher or on next config reload.
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- Use when the admin API isn't available or when Caddy is
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configured to read certificates from disk.
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- Behaviorally equivalent to the [Traefik](traefik.md) connector.
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## Deploy contract
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API mode bypasses the Bundle I file-write deploy primitive and
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talks directly to the Caddy admin API. File mode follows the
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standard atomic-write + verify path (idempotency check → backup
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→ atomic write → optional reload → post-deploy TLS verify).
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## Operator playbook
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### Admin API exposure
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Caddy's admin API is an unauthenticated control surface by
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default. In API mode, ensure the admin API is bound to a
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loopback or trusted network — exposing it to the public would
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let anyone reload Caddy's config. Run the agent on the same host
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as Caddy and use `http://localhost:2019` for the safest posture.
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### Falling back to file mode
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If the admin API is intermittently unreachable, switch the
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target's `mode` to `file` via `PUT /api/v1/targets/{id}`. The
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deploy still lands; reload behaviour is whatever the operator's
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Caddy config does with file changes.
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## Related docs
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- [Connector index](index.md) — interface contract, registry, deploy primitive
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- [Traefik](traefik.md) — comparable file-provider target
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- [Migration: point Caddy at certctl's ACME](../../migration/acme-from-caddy.md) — alternative pattern when Caddy should keep its ACME client
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