Add monitoring

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/prometheus-blackbox-exporter/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Restart prometheus-blackbox-exporter
+  service:
+    name: prometheus-blackbox-exporter
+    state: restarted

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

@@ -0,0 +1,23 @@
+---
+- name: Install Prometheus Blackbox exporter
+  apt:
+    update_cache: true
+    name: prometheus-blackbox-exporter
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Make Prometheus Blackbox exporter listen on localhost only
+  lineinfile:
+    path: /etc/default/prometheus-blackbox-exporter
+    regexp: '^ARGS='
+    line: >
+      ARGS='--config.file /etc/prometheus/blackbox.yml
+      --web.listen-address="localhost:9115"'
+  notify: Restart prometheus-blackbox-exporter
+
+- name: Activate prometheus Blackbox exporter service
+  systemd:
+    name: prometheus-blackbox-exporter
+    enabled: true
+    state: started