add blackbox exporter

hosts.yml

@@ -13,6 +13,7 @@ gateways:
       ffsh_fastd_mac: 00:5b:27:80:00:64
       enable_wireguard_exit: true
       owner: ulf
+      blackbox_http_url: https://beste.freifunk-suedholstein.de/
     brunsbach:
       ansible_ssh_host: 159.69.251.9
       external_ipv4: 159.69.251.9
@@ -26,6 +27,7 @@ gateways:
       ffsh_fastd_mac: 00:5b:27:80:00:96
       enable_wireguard_exit: true
       owner: benjamin
+      blackbox_http_url: https://brunsbach.freifunk-suedholstein.de/
     trave:
       ansible_ssh_host: 88.99.86.15
       external_ipv4: 88.99.86.15
@@ -39,15 +41,18 @@ gateways:
       ffsh_fastd_mac: 00:5b:27:80:02:08
       enable_wireguard_exit: true
       owner: ulf
+      blackbox_http_url: https://trave.freifunk-suedholstein.de/
   vars:
     ansible_user: root
 
 services:
   hosts:
     map-ffsh:
       ansible_ssh_host: 116.203.148.80
+      blackbox_http_url: https://map.freifunk-suedholstein.de/
     web-ffsh:
       ansible_ssh_host: 116.203.27.68
+      blackbox_http_url: https://freifunk-suedholstein.de/
   vars:
     ansible_user: root
 

roles/blackbox_exporter/handlers/main.yml

@@ -0,0 +1,4 @@
+- name: Restart blackbox exporter
+  ansible.builtin.systemd:
+    name: prometheus-blackbox-exporter
+    state: restarted

roles/blackbox_exporter/tasks/main.yml

@@ -0,0 +1,20 @@
+- name: Install blackbox exporter
+  ansible.builtin.apt:
+    name: prometheus-blackbox-exporter
+    state: present
+    update_cache: true
+
+- name: Configure blackbox exporter
+  ansible.builtin.template:
+    src: blackbox.yml.j2
+    dest: /etc/prometheus/blackbox.yml
+    owner: root
+    group: root
+    mode: "0644"
+  notify: Restart blackbox exporter
+
+- name: Enable and start blackbox exporter
+  ansible.builtin.systemd:
+    name: prometheus-blackbox-exporter
+    enabled: true
+    state: started

roles/blackbox_exporter/templates/blackbox.yml.j2

@@ -0,0 +1,6 @@
+modules:
+  http_2xx:
+    prober: http
+    timeout: 10s
+    http:
+      follow_redirects: true

roles/prometheus/templates/prometheus.yml.j2

@@ -28,6 +28,27 @@ scrape_configs:
     static_configs:
       - targets: ["localhost:9090"]
 
+  - job_name: "blackbox-http"
+
+    metrics_path: /probe
+    params:
+      module: [http_2xx]
+
+    static_configs:
+{% for target in groups['gateways'] + groups['services'] %}
+      - targets: ["{{ hostvars[target].blackbox_http_url }}"]
+        labels:
+          instance: "{{ target }}"
+{% endfor %}
+
+    relabel_configs:
+      - source_labels: [__address__]
+        target_label: __param_target
+      - source_labels: [__param_target]
+        target_label: instance
+      - target_label: __address__
+        replacement: 127.0.0.1:9115
+
   - job_name: "gateways"
 
     metrics_path: stats/metrics

setup.yml

@@ -150,6 +150,7 @@
   #   ansible.builtin.apt:
   #     update_cache: true
   roles:
+    - {role: blackbox_exporter, tags: "blackbox-exporter"}
     - {role: prometheus, tags: "prometheus"}
 
   post_tasks: