Prometheus Apache exporter

monitoring.yml

@@ -9,6 +9,8 @@
       - targets: [pulsar.adm.crans.org]
     prometheus_unifi_snmp_targets:
       - targets: "{{ groups['crans_unifi'] | list | sort }}"
+    prometheus_apache_targets:
+      - targets: [zamok.adm.crans.org]
   roles:
     - prometheus
     - prometheus-alertmanager
@@ -18,6 +20,11 @@
   roles:
     - prometheus-node
 
+# Export apache metrics
+- hosts: zamok.adm.crans.org
+  roles:
+    - prometheus-apache
+
 # Deploy grafana
 - hosts: fy.adm.crans.org
   vars:

roles/prometheus-apache/handlers/main.yml

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

roles/prometheus-apache/tasks/main.yml

@@ -0,0 +1,16 @@
+---
+- name: Install prometheus-apache-exporter
+  apt:
+    update_cache: true
+    name: prometheus-apache-exporter
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Make prometheus-apache-exporter listen on adm only
+  lineinfile:
+    path: /etc/default/prometheus-apache-exporter
+    regexp: '^ARGS='
+    line: |
+      ARGS="-telemetry.address={{ ansible_hostname }}.adm.crans.org:9117"
+  notify: Restart prometheus-apache-exporter

roles/prometheus/tasks/main.yml

@@ -57,6 +57,12 @@
     content: "{{ prometheus_unifi_snmp_targets | to_nice_json }}"
     dest: /etc/prometheus/targets_unifi_snmp.json
 
+# We don't need to restart Prometheus when updating nodes
+- name: Configure Prometheus Apache targets
+  copy:
+    content: "{{ prometheus_apache_targets | to_nice_json }}"
+    dest: /etc/prometheus/targets_apache.json
+
 - name: Activate prometheus service
   systemd:
     name: prometheus

roles/prometheus/templates/prometheus/prometheus.yml.j2

@@ -76,9 +76,21 @@ scrape_configs:
       - target_label: __address__
         replacement: 127.0.0.1:9116
 
+  - job_name: apache
+    file_sd_configs:
+      - files:
+        - '/etc/prometheus/targets_apache.json'
+    relabel_configs:
+      # Do not put :9117 in instance name, rather here
+      - source_labels: [__address__]
+        target_label: instance
+      - source_labels: [instance]
+        target_label: __address__
+        replacement: '$1:9117'
+
   - job_name: django
     scheme: https
     static_configs:
-#    - targets: []
+    - targets: []
 # Activate this line when the captive portal need monitoring
-    - targets: ["portail-captif.crans.org:443"]
+#    - targets: ["portail-captif.crans.org:443"]