hausgold/redis repository overview

This Docker images provides the official/redis⁠ image as base with the mDNS/ZeroConf stack on top. So you can enjoy redis⁠ while it is accessible by default as redis.local. (Port 6379)

• Requirements⁠
• Getting starting⁠
• docker-compose usage example⁠
• Host configs⁠
• Configure a different mDNS hostname⁠
• Other top level domains⁠
• Further reading⁠

⁠Requirements

• Host enabled Avahi daemon
• Host enabled mDNS NSS lookup

⁠Getting starting

You just need to run it like that, to get a working redis:

$ docker run --rm hausgold/redis

The port 6379 is untouched.

⁠docker-compose usage example

services:
  redis:
    image: hausgold/redis
    environment:
      # Mind the .local suffix
      MDNS_HOSTNAME: redis.test.local
      # We allow additional redis-server arguments via: (default)
      REDIS_ARGS: --databases 1000

⁠Host configs

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 ...

⁠Configure a different mDNS hostname

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/redis

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/redis

This will result in something.else.local, nothing.else.local and special.local.

⁠Other top level domains

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.

⁠Further reading

• 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/⁠