func (c *CoreDNS) String() string {
	return "etcdDNS"
}

// CoreDNS - represents dns config for coredns server.
type CoreDNS struct {
	domainNames []string
	domainIPs   set.StringSet
	domainPort  string
	prefixPath  string
	etcdClient  *clientv3.Client
}

// EtcdOption - functional options pattern style
type EtcdOption func(*CoreDNS)

      ],
      "protocol": "TCP",
      "uid": "Kubernetes//Pod/kube-system/coredns-5dd5756b68-mgjn9",
      "name": "coredns-5dd5756b68-mgjn9",
      "namespace": "kube-system",
      "trustDomain": "cluster.local",
      "serviceAccount": "coredns",
      "workloadName": "coredns",
      "workloadType": "deployment",
      "canonicalName": "coredns",
      "canonicalRevision": "latest",
      "node": "ambient-control-plane",

                                            "filter_metadata": {
                                                "istio": {
                                                    "workload": "coredns;kube-system;;;Kubernetes"
                                                }
                                            }
                                        },

    retry install_metallb ""
  fi

  # IPv6 clusters need some CoreDNS changes in order to work in CI:
  # Istio CI doesn't offer IPv6 connectivity, so CoreDNS should be configured
  # to work in an offline environment:
  # https://github.com/coredns/coredns/issues/2494#issuecomment-457215452
  # CoreDNS should handle those domains and answer with NXDOMAIN instead of SERVFAIL

istio-system       ztunnel-xljhg                                        10.244.1.44 ambient-worker        None                                TCP
kube-system        coredns-5dd5756b68-mgjn9                             10.244.0.2  ambient-control-plane None                                TCP
kube-system        coredns-5dd5756b68-nzlpw                             10.244.0.3  ambient-control-plane None                                TCP

                        "metadata": {
                            "filterMetadata": {
                                "istio": {
                                    "workload": "coredns;kube-system;;;Kubernetes"
                                }
                            }
                        },
                        "loadBalancingWeight": 1
                    },
                    {

          istio:
            workload: coredns;kube-system;;;Kubernetes
    - endpoint:
        address:
          socketAddress:
            address: 10.244.0.3
            portValue: 53
        healthCheckConfig: {}
      healthStatus: HEALTHY
      loadBalancingWeight: 1
      metadata:
        filterMetadata:
          istio:
            workload: coredns;kube-system;;;Kubernetes
    loadBalancingWeight: 2

= vendor/github.com/coredns/caddy licensed under: =

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

= vendor/github.com/coredns/corefile-migration licensed under: =

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

### 2. Run MinIO in federated mode

Bucket lookup from DNS federation requires two dependencies

- etcd (for bucket DNS service records)
- CoreDNS (for DNS management based on populated bucket DNS service records, optional)

## Architecture

![bucket-lookup](https://github.com/minio/minio/blob/master/docs/federation/lookup/bucket-lookup.png?raw=true)