Improve playbook with run_once

Author: seunghun1ee

etc/kayobe/ansible/deploy-radosgw-usage-exporter.yml

@@ -13,6 +13,7 @@
       environment: "{{ openstack_auth_env }}"
       delegate_to: localhost
       register: credential_check
+      run_once: true
 
     - name: Create ec2 credential if there's none
       command: >
@@ -21,6 +22,7 @@
         --format json
       environment: "{{ openstack_auth_env }}"
       delegate_to: localhost
+      run_once: true
       when: "{{ credential_check.stdout == [] }}"
 
     - name: Query ec2 credential for admin
@@ -31,6 +33,7 @@
       environment: "{{ openstack_auth_env }}"
       delegate_to: localhost
       register: credential
+      run_once: true
 
     - name: Get object storage endpoint
       command: >
@@ -40,6 +43,7 @@
       environment: "{{ openstack_auth_env }}"
       delegate_to: localhost
       register: endpoint
+      run_once: true
 
     - name: Ensure radosgw_usage_exporter container is running
       community.docker.docker_container:
@@ -57,17 +61,21 @@
         radosgw_server: "{{ host.URL | regex_replace('(https?://)([^:/]+):([0-9]+)/.*', '\\1\\2:\\3') }}" # Drop Swift api address
       become: true
 
-    - name: Get target ip addresses
+    - name: Get Prometheus target ip addresses of RADOS gateway usage exporters
       set_fact:
         prometheus_targets: "{{ prometheus_targets | default([]) +[( internal_net_name | net_ip( item ) + ':9242' )] }}"
       loop: "{{ groups['monitoring'] }}"
+      run_once: true
 
-    - name: Ensure radosgw_usage_exporter is targeted by prometheus-server
-      blockinfile:
-        path: /etc/kolla/prometheus-server/prometheus.yml
-        block: |
-          - honor_labels: true
-            job_name: ceph_radosgw_usage_exporter
+    - name: Print config to append on prometheus.yml
+      debug:
+        msg: |
+          Add Prometheus target for RADOS gateway usage exporter below at prometheus.yml then reconfigure prometheus_server.
+          You can find a template to prometheus.yml at ``ansible/roles/prometheus/templates/prometheus.yml.j2`` under kolla-ansible directory.
+          Make sure to use {% raw %} and {% endraw %} tags appropriately on prometheus.yml if you're overriding it for the first time.
+
+          - job_name: ceph_radosgw_usage_exporter
+            honor_labels: true
             scrape_interval: 15s
             static_configs:
             - targets:
@@ -80,9 +88,5 @@
               separator: ""
               regex: (.+)
               replacement: ${1}
-      become: true
+      run_once: true
 
-    - name: Restart prometheus-server
-      ansible.builtin.command:
-        cmd: systemctl restart kolla-prometheus_server-container
-      become: true