This Docker images provides the official/node image as base with the mDNS/ZeroConf stack on top. So you can enjoy your node app while it is accessible by default as node.local. (Port 80)
- Requirements
- Getting starting
- docker-compose usage example
- Host configs
- Configure a different mDNS hostname
- Other top level domains
- Further reading
- Host enabled Avahi daemon
- Host enabled mDNS NSS lookup
You just need to run it like that, to get a working node:
$ docker run --rm hausgold/node
The port 3000 is proxied by haproxy to port 80 to make node.local directly accessible. The port 3000 is untouched.
node:
image: hausgold/node
environment:
# Mind the .local suffix
- MDNS_HOSTNAME=node.test.local
ports:
# The ports are just for you to know when configure your
# container links, on depended containers
- "3000"
Install the nss-mdns package, enable and start the avahi-daemon.service. Then, edit the file /etc/nsswitch.conf and change the hosts line like this:
hosts: ... mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns ...
The magic environment variable is MDNS_HOSTNAME. Just pass it like that to your docker run command:
$ docker run --rm -e MDNS_HOSTNAME=something.else.local hausgold/node
This will result in something.else.local.
You can also configure multiple aliases (CNAME's) for your container by passing the MDNS_CNAMES environment variable. It will register all the comma separated domains as aliases for the container, next to the regular mDNS hostname.
$ docker run --rm \
-e MDNS_HOSTNAME=something.else.local \
-e MDNS_CNAMES=nothing.else.local,special.local \
hausgold/node
This will result in something.else.local, nothing.else.local and special.local.
By default .local is the default mDNS top level domain. This images does not force you to use it. But if you do not use the default .local top level domain, you need to configure your host avahi to accept it.
- Docker/mDNS demo: https://github.com/Jack12816/docker-mdns
- Archlinux howto: https://wiki.archlinux.org/index.php/avahi
- Ubuntu/Debian howto: https://wiki.ubuntuusers.de/Avahi/