diff --git a/data/data/libvirt/main.tf b/data/data/libvirt/main.tf
index ccc4b3a08f1..51c75c46f4c 100644
--- a/data/data/libvirt/main.tf
+++ b/data/data/libvirt/main.tf
@@ -64,8 +64,8 @@ resource "libvirt_domain" "master" {
 
   name = "${var.tectonic_cluster_name}-master-${count.index}"
 
-  memory = "3072"
-  vcpu   = "2"
+  memory = "${var.libvirt_master_memory}"
+  vcpu   = "${var.libvirt_master_vcpu}"
 
   coreos_ignition = "${libvirt_ignition.master.id}"
 
diff --git a/data/data/libvirt/variables-libvirt.tf b/data/data/libvirt/variables-libvirt.tf
index cb76f1c5504..b48e7913145 100644
--- a/data/data/libvirt/variables-libvirt.tf
+++ b/data/data/libvirt/variables-libvirt.tf
@@ -32,3 +32,19 @@ variable "tectonic_libvirt_master_ips" {
   type        = "list"
   description = "the list of desired master ips. Must match tectonic_master_count"
 }
+
+# It's definitely recommended to bump this if you can.
+variable "libvirt_master_memory" {
+  type        = "string"
+  description = "RAM in MiB allocated to masters"
+  default     = "4096"
+}
+
+# At some point this one is likely to default to the number
+# of physical cores you have.  See also
+# https://pagure.io/standard-test-roles/pull-request/223
+variable "libvirt_master_vcpu" {
+  type        = "string"
+  description = "CPUs allocated to masters"
+  default     = "2"
+}