diff --git a/tripleo_ansible/ansible_plugins/module_utils/ceph_spec.py b/tripleo_ansible/ansible_plugins/module_utils/ceph_spec.py
index a976c2edb..8296ed21b 100644
--- a/tripleo_ansible/ansible_plugins/module_utils/ceph_spec.py
+++ b/tripleo_ansible/ansible_plugins/module_utils/ceph_spec.py
@@ -208,7 +208,7 @@ class CephDaemonSpec(object):
         # append the spec if provided
         if len(self.spec.keys()) > 0:
             if self.validate_keys(self.spec.keys(), ALLOWED_SPEC_KEYS):
-                sp = {'spec': self.filter_spec(self.spec)}
+                sp = {'spec': self.normalize_spec(self.filter_spec(self.spec))}
             else:
                 raise Exception("Fatal: the spec should be composed by only allowed keywords")
 
@@ -216,6 +216,17 @@ class CephDaemonSpec(object):
         spec_template = {**spec_template, **ntw, **self.extra, **pl, **sp}
         return spec_template
 
+    def normalize_spec(self, spec):
+        '''
+        For each spec key we need to make sure
+        that ports are evaluated as int, otherwise
+        cephadm fails when the spec is applied.
+        '''
+        for k, v in spec.items():
+            if 'port' in k:
+                spec[k] = int(v)
+        return spec
+
     def filter_spec(self, spec):
         return {k: v for k, v in spec.items() if v}
 
diff --git a/tripleo_ansible/roles/tripleo_cephadm/tasks/monitoring.yaml b/tripleo_ansible/roles/tripleo_cephadm/tasks/monitoring.yaml
index fa728388f..83b732028 100644
--- a/tripleo_ansible/roles/tripleo_cephadm/tasks/monitoring.yaml
+++ b/tripleo_ansible/roles/tripleo_cephadm/tasks/monitoring.yaml
@@ -63,20 +63,22 @@
     - name: Create the monitoring stack Daemon spec definition
       become: true
       ceph_mkspec:
-        service_type: "{{ item }}"
-        service_id: "{{ item }}"
-        service_name: "{{ item }}"
+        service_type: "{{ item.daemon }}"
+        service_id: "{{ item.daemon }}"
+        service_name: "{{ item.daemon }}"
         apply: true
         hosts: "{{ _hosts | unique }}"
         render_path: "{{ tripleo_cephadm_spec_home }}"
         networks: "{{ tripleo_cephadm_monitoring_address_block }}"
+        spec:
+          port: "{{ item.port }}"
       environment:
         CEPH_CONTAINER_IMAGE: "{{ tripleo_cephadm_container_ns + '/' + tripleo_cephadm_container_image + ':' + tripleo_cephadm_container_tag }}"
         CEPH_CONTAINER_BINARY: "{{ tripleo_cephadm_container_cli }}"
       with_items:
-        - "alertmanager"
-        - "prometheus"
-        - "grafana"
+        - {"daemon": "grafana", "port": "{{ tripleo_cephadm_grafana_port | default(3100) }}"}
+        - {"daemon": "prometheus", "port": "{{ tripleo_cephadm_prometheus_port | default(9092) }}"}
+        - {"daemon": "alertmanager", "port": "{{ tripleo_cephadm_alertmanager_port | default(9094) }}"}
   when: tripleo_cephadm_dashboard_enabled | bool
 
 - include_tasks: dashboard/dashboard.yaml