// if empty then c.prefixPath is used i.e "/skydns"
func CoreDNSPath(prefix string) EtcdOption {
	return func(args *CoreDNS) {
		args.prefixPath = prefix
	}
}

// NewCoreDNS - initialize a new coreDNS set/unset values.
func NewCoreDNS(cfg clientv3.Config, setters ...EtcdOption) (Store, error) {
	etcdClient, err := clientv3.New(cfg)
	if err != nil {
		return nil, err
	}

	args := &CoreDNS{

				// users are confused.
				configLogIf(ctx, fmt.Errorf("DNS store is already configured with %s, etcd is not used for DNS store", globalDNSConfig))
			} else {
				globalDNSConfig, err = dns.NewCoreDNS(etcdCfg.Config,
					dns.DomainNames(globalDomainNames),
					dns.DomainIPs(globalDomainIPs),
					dns.DomainPort(globalMinioPort),
					dns.CoreDNSPath(etcdCfg.CoreDNSPath),
				)
				if err != nil {