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,
 		},
diff --git a/metropolis/test/launch/cli/launch-cluster/main.go b/metropolis/test/launch/cli/launch-cluster/main.go
index 859e17f..793cc28 100644
--- a/metropolis/test/launch/cli/launch-cluster/main.go
+++ b/metropolis/test/launch/cli/launch-cluster/main.go
@@ -148,6 +148,7 @@
 	var consensusMemberList, kubernetesControllerList, kubernetesWorkerList []int
 
 	flag.IntVar(&opts.NumNodes, "num-nodes", 3, "Number of cluster nodes")
+	flag.StringVar(&clusterConfig.ClusterDomain, "cluster-domain", "cluster.internal", "Cluster domain")
 	flagdefs.TPMModeVar(flag.CommandLine, &clusterConfig.TpmMode, "tpm-mode", cpb.ClusterConfiguration_TPM_MODE_REQUIRED, "TPM mode to set on cluster")
 	flagdefs.StorageSecurityPolicyVar(flag.CommandLine, &clusterConfig.StorageSecurityPolicy, "storage-security", cpb.ClusterConfiguration_STORAGE_SECURITY_POLICY_NEEDS_INSECURE, "Storage security policy to set on cluster")
 	flag.IntVar(&opts.Node.CPUs, "cpu", 1, "Number of virtual CPUs of each node")