diff --git a/metropolis/test/e2e/suites/core/run_test.go b/metropolis/test/e2e/suites/core/run_test.go
index c8f654f..7a07b1e 100644
--- a/metropolis/test/e2e/suites/core/run_test.go
+++ b/metropolis/test/e2e/suites/core/run_test.go
@@ -81,6 +81,7 @@
 		NumNodes:      2,
 		LocalRegistry: lr,
 		InitialClusterConfiguration: &cpb.ClusterConfiguration{
+			ClusterDomain:         "cluster.test",
 			TpmMode:               cpb.ClusterConfiguration_TPM_MODE_DISABLED,
 			StorageSecurityPolicy: cpb.ClusterConfiguration_STORAGE_SECURITY_POLICY_NEEDS_INSECURE,
 		},
diff --git a/metropolis/test/e2e/suites/ha_cold/run_test.go b/metropolis/test/e2e/suites/ha_cold/run_test.go
index 6a5c6e8..43ff689 100644
--- a/metropolis/test/e2e/suites/ha_cold/run_test.go
+++ b/metropolis/test/e2e/suites/ha_cold/run_test.go
@@ -42,6 +42,7 @@
 		NumNodes:        3,
 		NodeLogsToFiles: true,
 		InitialClusterConfiguration: &cpb.ClusterConfiguration{
+			ClusterDomain:         "cluster.test",
 			TpmMode:               cpb.ClusterConfiguration_TPM_MODE_DISABLED,
 			StorageSecurityPolicy: cpb.ClusterConfiguration_STORAGE_SECURITY_POLICY_NEEDS_INSECURE,
 		},
diff --git a/metropolis/test/e2e/suites/kubernetes/run_test.go b/metropolis/test/e2e/suites/kubernetes/run_test.go
index 80a8292..f815c57 100644
--- a/metropolis/test/e2e/suites/kubernetes/run_test.go
+++ b/metropolis/test/e2e/suites/kubernetes/run_test.go
@@ -72,6 +72,7 @@
 	clusterOptions := mlaunch.ClusterOptions{
 		NumNodes: 2,
 		InitialClusterConfiguration: &cpb.ClusterConfiguration{
+			ClusterDomain:         "cluster.test",
 			TpmMode:               cpb.ClusterConfiguration_TPM_MODE_DISABLED,
 			StorageSecurityPolicy: cpb.ClusterConfiguration_STORAGE_SECURITY_POLICY_NEEDS_INSECURE,
 			KubernetesConfig: &cpb.ClusterConfiguration_KubernetesConfig{
@@ -266,6 +267,7 @@
 		NumNodes:      2,
 		LocalRegistry: lr,
 		InitialClusterConfiguration: &cpb.ClusterConfiguration{
+			ClusterDomain:         "cluster.test",
 			TpmMode:               cpb.ClusterConfiguration_TPM_MODE_DISABLED,
 			StorageSecurityPolicy: cpb.ClusterConfiguration_STORAGE_SECURITY_POLICY_NEEDS_INSECURE,
 		},