Docker

This is to create automatic PTR and A/AAA records for the docker daemon

NOTE: it is a good idea to have caching enabled in the Corefile due to possible delays with the docker daemon

Requirements

The CoreDNS server needs to be able to read the unix socket for docker (typically be part of the docker group)

Using

Example

docker.example.com 2001:db8::/64 172.19.0.0/16 {
    docker {
        suffix ".docker.example.com"
    }
    cache {
        success 1024
        denial 1024
    }
}

Options

suffix:

This is to specify the ending of the container, such as .docker.example.com with the container name mariadb would become the hostname mariadb.docker.example.com. Please note: the leading dot is REQUIRED

ttl: set the TTL (default 86400)