epiclabs-io / epicmdns

mdns module for CoreDNS

epic-mdns mDNS CoreDNS plugin

This CoreDNS plug-in bridges DNS to your local network, translating found .local hosts to any preconfigured domain

Technically, it supports all kinds of records. Additionally, it can browse the network periodically to discover services (DNS-SD).

How to use:

First, add the following to your CoreDNS plugin.cfg and recompile CoreDNS:

epicmdns:github.com/epiclabs-io/epicmdns

Second, add to your Corefile:

example.com {
    cancel
	epicmdns example.com {
	}
}

The above exposes all found mDNS .local services and hosts under example.com. Thus, myserver.local in mDNS can now be resolved as myserver.example.com.

Advanced configuration

epicmdns <domain> {              # domain to map to
    min_ttl <seconds>            # (int, seconds) minimum TTL to keep records for, overriding mDNS response. Default 300s
    browse_period <seconds>      # (int, seconds) period to keep service list updated. Default 60s
    force_unicast                # (bool) whether we ask hosts to respond directly to us if possible. Default false
    ip4 <ip>                     # (string, IP address) IPv4 interface to bind to. Defaults to 0.0.0.0
    ip6 <ipv6>                   # (string, IP address) IPv6 interface to bind to. Defaults to 0::0
    browse <service>             # (string) repeat as necessary. List of services to scan and keep updated
    browse_period  <seconds>     # (int, seconds) How often scan the list of services. Default 60s
    retry_period <seconds>       # (float, seconds) How often retry mDNS queries. Default 0.250s
    cache_purge_period <seconds> # (int, seconds) How often clean the cache for stale records. Default 300s

Full examples

Expose .local directly to regular DNS

This example exposes .local hosts to conventional DNS, as-is. Useful to help non-mDNS aware client devices, such as Android and older versions of Windows in the LAN discover mDNS services and hosts.

local {
	debug
	log
	cancel
	epicmdns local {
		min_ttl 120
        browse_period 60
        browse _workstation._tcp.local
        browse _etcd-server-ssl._tcp
	}
	records local {
		@  60 IN SOA myserver admin.myserver 1 120 120 120 300
	}
}

Map .local to an arbitrary domain

This example exposes .local hosts to conventional DNS, mapping them to .epiclabs.io

epiclabs.io {
	debug
	log
	cancel
	epicmdns epiclabs.io
}

Your Feedback

Add your issue here on GitHub. Feel free to get in touch if you have any questions.

Author(s)

This package is written and maintained by Javier Peletier (@jpeletier) - Epic Labs