diff --git a/core/installer/dns/client.go b/core/installer/dns/client.go
new file mode 100644
index 0000000..1a13a87
--- /dev/null
+++ b/core/installer/dns/client.go
@@ -0,0 +1,19 @@
+package dns
+
+import (
+	"net"
+)
+
+type Client interface {
+	Lookup(host string) ([]net.IP, error)
+}
+
+type realClient struct{}
+
+func NewClient() Client {
+	return realClient{}
+}
+
+func (c realClient) Lookup(host string) ([]net.IP, error) {
+	return net.LookupIP(host)
+}