diff --git a/roles/openshift_node/defaults/main.yml b/roles/openshift_node/defaults/main.yml
index 69994b47697..f463578eb06 100644
--- a/roles/openshift_node/defaults/main.yml
+++ b/roles/openshift_node/defaults/main.yml
@@ -187,6 +187,8 @@ default_r_openshift_node_os_firewall_allow:
 - service: Kubernetes service NodePort UDP
   port: "{{ openshift_node_port_range | default('') }}/udp"
   cond: "{{ openshift_node_port_range is defined }}"
+- service: Prometheus monitoring
+  port: 9000-10000/tcp
 # Allow multiple port ranges to be added to the role
 r_openshift_node_os_firewall_allow: "{{ default_r_openshift_node_os_firewall_allow | union(openshift_node_open_ports | default([])) }}"