register nodes on the server

books/monitoring.yml

@@ -1,6 +1,6 @@
 #!/usr/bin/env ansible-playbook
 ---
-- hosts: prometheus_server
+- hosts: prometheus_servers
   roles:
     - prometheus
 

group_vars/all/vars.yml

@@ -2,3 +2,6 @@
 # Use python 3
 ansible_python_interpreter: /usr/bin/python3
 dns_resolve_server: 1.1.1.1
+
+# Default prometheus serveur, to overide in host_vars or something
+appointed_prometheus_server: hindley

hosts

@@ -30,6 +30,8 @@ all:
     tests:
       hosts:
         rossum:
+        azerty:
+        hellman:
     vpn:
       hosts:
         azerty:
@@ -40,7 +42,7 @@ all:
     apt_proxies:
       hosts:
         hindley:
-    prometheus_server:
+    prometheus_servers:
       hosts:
         hindley:
     matrix:

roles/prometheus-node-exporter/tasks/main.yml

@@ -30,3 +30,26 @@
         value: "{{ lan_address }}:9100"
 #      - name: web.config
 #        value: /etc/node_exporter/config.yaml
+
+# Add the node to the server targets
+
+- name: Get the list of targets of the server
+  slurp:
+    src: /etc/prometheus/node-targets.json
+  register: server_target_file
+  delegate_to: "{{ appointed_prometheus_server }}"
+
+- name: Set target variable
+  set_fact:
+    server_target: "{{ server_target_file['content'] | b64decode | from_json }}"
+
+- name: Add the node to the targets
+  set_fact:
+    server_target: "[{{ server_target[0] | combine({'targets': [lan_address]}, list_merge='append_rp') }}]"
+
+- name: Put the new target list
+  copy:
+    content: "{{ server_target | to_nice_json }}"
+    dest: /etc/prometheus/node-targets.json
+  delegate_to: "{{ appointed_prometheus_server }}"
+