t.Fatal(err)
	}
	certFile = path.Join(tempDir, "etcdcert.pem")
	if err := ioutil.WriteFile(certFile, []byte(testingcert.CertFileContent), 0644); err != nil {
		t.Fatal(err)
	}
	keyFile = path.Join(tempDir, "etcdkey.pem")
	if err := ioutil.WriteFile(keyFile, []byte(testingcert.KeyFileContent), 0644); err != nil {
		t.Fatal(err)
	}
	caFile = path.Join(tempDir, "ca.pem")