Ghost Caddy Multihost

Short example how to get multiple Ghost CMS instances running in front of a single Caddy Webserver.

The key in this example is to use the domain name as the name of the docker-compose folder:

├── example.com
│   └── compose.yml
├── example.org
│   └── compose.yml
├── example.net
│   └── compose.yml
└── webserver
    ├── compose.yml
    └── conf
        └── Caddyfile

In Caddy’s compose.yml we reference those domains as variables:

---
    environment:
      FROM_IP: 'w.x.y.z/32'
      DOMAIN_1: example.com
      DOMAIN_2: example.org
      DOMAIN_3: example.net
    networks:
      # DOMAIN_1
      - examplecom_default
      # DOMAIN_2
      - exampleorg_default
      # DOMAIN_3
      - examplenet_default

networks:
  # DOMAIN_1
  examplecom_default:
    external: true
  # DOMAIN_2
  exampleorg_default:
    external: true
  # DOMAIN_3
  examplenet_default:
    external: true

Now in each Ghost compose.yml we disable ports: and adding container_name: with our domain name to enable this name as a DNS address inside of the docker network:

---
services:
  ghost:
    image: ghost:6.9.1
    restart: always
#    ports:
#      - 8080:2368
    container_name: example.com

Finally in Caddy’s config we adding the target domains as variables:

{$FROM_IP} = allowed to access /ghost
{$DOMAIN_1}= referenced as domain and reverse_proxy target

{$DOMAIN_1} {
	reverse_proxy {$DOMAIN_1}:2368
	log {
		output file /log/{$DOMAIN_1}.log
	}
	@denied {
		not remote_ip {$FROM_IP}
		path /ghost/*
	}
	abort @denied
}

{$DOMAIN_2} {
	reverse_proxy {$DOMAIN_2}:2368
	log {
		output file /log/{$DOMAIN_2}.log
	}
	@denied {
		not remote_ip {$FROM_IP}
		path /ghost/*
	}
	abort @denied
}

{$DOMAIN_3} {
	reverse_proxy {$DOMAIN_3}:2368
	log {
		output file /log/{$DOMAIN_3}.log
	}
	@denied {
		not remote_ip {$FROM_IP}
		path /ghost/*
	}
	abort @denied
}

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Ghost Caddy Multihost