Caddyfile.tmpl

{{ $CurrentContainer := where $ "ID" .Docker.CurrentContainerID | first }}

{{ define "proxy_vhost" }}
	{{ if .Address }}
		{{ if and .Container.Node.ID .Address.HostPort }}
	## Using container IP:PORT
	proxy / {{ .Container.Node.Address.IP }}:{{ .Address.HostPort }} {
		transparent
	}
		{{ else if .Network }}
	## Using Network IP:PORT
	proxy / {{ .Network.IP }}:{{ .Address.Port }} {
		transparent
	}
		{{ end }}
	{{ else if .Network }}
	## Using fallback to Network IP:80
	## "{{ .Container.Name }}"
	proxy / {{ .Network.IP }} {
		transparent
	}
	{{ end }}
{{ end }}

{{ range $host, $containers := groupByMulti $ "Env.VIRTUAL_HOST" "," }}
{{ $host }} {
{{ range $container := $containers }}
	## $container.Name: "{{ $container.Name }}"
	{{ $addrLen := len $container.Addresses }}
	{{ range $knownNetwork := $CurrentContainer.Networks }}
		{{ range $containerNetwork := $container.Networks }}
			{{ if eq $knownNetwork.Name $containerNetwork.Name }}

				{{ $basicauth := $container.Env.VIRTUAL_HOST_BASIC_AUTH }}
				{{ if $basicauth }}
	basicauth {{ $basicauth }}
				{{ end }}

				{{/* If only 1 port exposed, use that */}}
				{{ if eq $addrLen 1 }}
	{{ $address := index $container.Addresses 0 }}
	{{ template "proxy_vhost" (dict "Container" $container "Address" $address "Network" $containerNetwork) }}
				{{/* If more than one port exposed, use the one matching VIRTUAL_PORT env var, falling back to standard web port 80 */}}
				{{ else }}
	{{ $port := coalesce $container.Env.VIRTUAL_PORT "80" }}
	{{ $address := where $container.Addresses "Port" $port | first }}
	{{ template "proxy_vhost" (dict "Container" $container "Address" $address "Network" $containerNetwork) }}
				{{ end }}

				{{ $extraconfig := $container.Env.VIRTUAL_HOST_EXTRA_CONFIG }}
				{{ if $extraconfig }}
	{{ $extraconfig }}
				{{ end }}
			{{ end }}
		{{ end }}
	{{ end }}
{{ end }}
	log stdout
	errors stdout
}
{{ end }}