Wildcard Subdomain

[caf-3]

Description

When users sign up for an application hosted on Coolify (e.g., at example.com), automatically create and configure a subdomain for them (username.example.com) without manual intervention.

Desired Behavior

1. Application owner configures a wildcard domain (*.example.com) in Coolify
2. When a new user signs up inside my system (for example):

• System automatically creates a subdomain based on their username (username.example.com)
• Routes traffic for that subdomain to the main application
• No manual intervention required from the application owner
• Subdomain becomes immediately active and accessible

Use Cases

1. SaaS applications wanting to provide branded subdomains to customers
2. Multi-tenant applications where each tenant needs their own subdomain
3. Portfolio platforms where users get their own space (username.example.com)
4. Blog platforms providing custom domains to writers

[Seym0n]

I achieved this through custom labels:

traefik.enable=true
traefik.http.middlewares.gzip.compress=true
traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https

# HTTP router for subdomains
traefik.http.routers.<unique_router_name_subdomain_http>.entryPoints=http
traefik.http.routers.<unique_router_name_subdomain_http>.middlewares=redirect-to-https
traefik.http.routers.<unique_router_name_subdomain_http>.rule=HostRegexp(`.*\.example\.com`)
traefik.http.routers.<unique_router_name_subdomain_http>.service=<unique_service_name_subdomain>

# HTTP router for root domain
traefik.http.routers.<unique_router_name_root_http>.entryPoints=http
traefik.http.routers.<unique_router_name_root_http>.middlewares=redirect-to-https
traefik.http.routers.<unique_router_name_root_http>.rule=Host(`example.com`) && PathPrefix(`/`)
traefik.http.routers.<unique_router_name_root_http>.service=<unique_service_name_root>

# HTTPS router for subdomains
traefik.http.routers.<unique_router_name_subdomain_https>.entryPoints=https
traefik.http.routers.<unique_router_name_subdomain_https>.middlewares=gzip
traefik.http.routers.<unique_router_name_subdomain_https>.rule=HostRegexp(`.*\.example\.com`)
traefik.http.routers.<unique_router_name_subdomain_https>.service=<unique_service_name_subdomain>
traefik.http.routers.<unique_router_name_subdomain_https>.tls.certresolver=letsencrypt
traefik.http.routers.<unique_router_name_subdomain_https>.tls=true

# HTTPS router for root domain
traefik.http.routers.<unique_router_name_root_https>.entryPoints=https
traefik.http.routers.<unique_router_name_root_https>.middlewares=gzip
traefik.http.routers.<unique_router_name_root_https>.rule=Host(`example.com`) && PathPrefix(`/`)
traefik.http.routers.<unique_router_name_root_https>.service=<unique_service_name_root>
traefik.http.routers.<unique_router_name_root_https>.tls.certresolver=letsencrypt
traefik.http.routers.<unique_router_name_root_https>.tls=true

# Services configuration
traefik.http.services.<unique_service_name_subdomain>.loadbalancer.server.port=3000
traefik.http.services.<unique_service_name_root>.loadbalancer.server.port=3000

# Caddy configuration
caddy_0.encode=zstd gzip
caddy_0.handle_path.0_reverse_proxy={{upstreams 3000}}
caddy_0.handle_path=/*
caddy_0.header=-Server
caddy_0.try_files={path} /index.html /index.php
caddy_0=*.example.com

caddy_1.encode=zstd gzip
caddy_1.handle_path.1_reverse_proxy={{upstreams 3000}}
caddy_1.handle_path=/*
caddy_1.header=-Server
caddy_1.try_files={path} /index.html /index.php
caddy_1=example.com
caddy_ingress_network=coolify

[vikyw89]

how did you have 4 unique service names ?
I only got 2 for a single service,

• 1 for http
• 1 for https

[Seym0n]

It's in the format

http-0-<service-name>
http-1-<service-name>
https-0-<service-name>
https-1-<service-name>

which result in

traefik.http.routers.http-0-<service-name>.entryPoints=http
traefik.http.routers.http-0-<service-name>.middlewares=redirect-to-https
traefik.http.routers.http-0-<service-name>.rule=HostRegexp(`.*\.example\.com`)
traefik.http.routers.http-0-<service-name>.service=http-0-<service-name>

# HTTP router for root domain
traefik.http.routers.http-1-<service-name>.entryPoints=http
traefik.http.routers.http-1-<service-name>.middlewares=redirect-to-https
traefik.http.routers.http-1-<service-name>.rule=Host(`example.com`) && PathPrefix(`/`)
traefik.http.routers.http-1-<service-name>.service=http-1-<service-name>