Docker Dynamic Upstreams for Caddy.

This package implements a docker dynamic upstreams module for Caddy.

This is a fork which puts more emphasis on using the Caddyfile for routing instead of container labels.

Requires Caddy 2+.

Installation

Download from official website or build yourself using xcaddy.

Here is a Dockerfile example.

FROM caddy:<version>-builder AS builder

RUN xcaddy build \
    --with github.com/v4violet/caddy-docker-upstreams

FROM caddy:<version>

COPY --from=builder /usr/bin/caddy /usr/bin/caddy

Caddyfile Syntax

example.com {
  reverse_proxy /api/* {
    dynamic docker "api"
  }

  reverse_proxy {
    dynamic docker "frontend"
  }
}

Docker Labels

This module requires the Docker Labels to provide the necessary information.

Label	Description
caddy	required, should match the label in the Caddyfile (eg. caddy=api matches upstream definition of dynamic docker "api")
caddy.network	optional but suggested if your container is attached to multiple networks, specify the docker network which caddy connecting through (if it is empty, the first network of container will be specified)
caddy.port	optional unless the plugin cant auto detect the port

Example

# docker-compose.yaml
services:
  whoami:
    image: traefik/whoami:latest
    restart: always
    labels:
      - caddy=whoami
      - caddy.port=80

# Caddyfile
whoami.example.com {
  reverse_proxy {
    dyanmic docker "whoami"
  }
}

Docker Client

Environment variables could configure the docker client:

• DOCKER_HOST to set the URL to the docker server.
• DOCKER_API_VERSION to set the version of the API to use, leave empty for latest.
• DOCKER_CERT_PATH to specify the directory from which to load the TLS certificates ("ca.pem", "cert.pem", "key.pem').
• DOCKER_TLS_VERIFY to enable or disable TLS verification (off by default).