Set a hosts file when selfcontaining

net.go

@@ -175,6 +175,10 @@ func setupDNS(servers []net.IP, etc string) error {
 	}
 	resolv := []byte(strings.Join(lines, "\n"))
 	err := ioutil.WriteFile(path.Join(etc, "resolv.conf"), resolv, 0644)
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(path.Join(etc, "hosts"), []byte("::1 localhost"), 0644)
 	return err
 }