fdyn - simple Dynamic DNS plugin for CoreDNS, using a mix of forward and Redis.
The fdyn plugin is a forked version of the standard CoreDNS forward
plugin, with a difference: if the
returned IP from the upstream server is 0.0.0.0 (IPv4) or ::/0 (IPv6), fdyn
will look up the name in the local Redis (using GET of the FQDN, including
trailing period) and substitutes that instead. Thus you can set up all the
paraphernalia of SOA, NS and authority records in a proper DNS server, and
just override the dynamic IP address that is usually all you want to do.
If the queried string does not exist, fdyn will look for wildcard entries, e.g. if foo.bar.example.com is the domain looked up, fdyn will look up in Redis:
- foo.bar.example.com
- *.foo.bar.example.com
- *.bar.example.com
- *.example.com
- *.com