[prometheus] Install snmp export

monitoring.yml

@@ -27,6 +27,9 @@
           job: prometheus
         targets:
           - localhost:9090
+    prometheus_snmp_targets:
+      - targets:
+          - pulsar.adm.crans.org
   roles:
     - prometheus
     - prometheus-alertmanager

roles/prometheus-node/handlers/main.yml

+---
+- name: Restart prometheus-node-exporter
+  service:
+    name: prometheus-node-exporter
+    state: restarted

roles/prometheus-node/tasks/main.yml

@@ -7,6 +7,12 @@
   retries: 3
   until: apt_result is succeeded
 
+- name: Activate prometheus-node-exporter service
+  systemd:
+    name: prometheus-node-exporter
+    enabled: yes
+    state: started
+
 # Doesn't work on Debian Stretch
 - name: Make Prometheus node-exporter listen on adm only
   when:

roles/prometheus/handlers/main.yml

@@ -3,3 +3,8 @@
   service:
     name: prometheus
     state: restarted
+
+- name: Restart prometheus-snmp-exporter
+  service:
+    name: prometheus-snmp-exporter
+    state: restarted

roles/prometheus/tasks/main.yml

@@ -2,7 +2,9 @@
 - name: Install Prometheus
   apt:
     update_cache: true
-    name: prometheus
+    name:
+      - prometheus
+      - prometheus-snmp-exporter
   register: apt_result
   retries: 3
   until: apt_result is succeeded
@@ -19,8 +21,30 @@
     dest: /etc/prometheus/alert.rules.yml
   notify: Restart Prometheus
 
+# Doesn't work on Debian Stretch
+- name: Make Prometheus snmp-exporter listen on adm only
+  when:
+    - ansible_distribution_release == 'buster'
+  lineinfile:
+    path: /etc/default/prometheus-node-exporter
+    regexp: '^ARGS='
+    line: "ARGS=\"--web.listen-address={{ ansible_fqdn }}:9116\""
+  notify: Restart prometheus-snmp-exporter
+
 # We don't need to restart Prometheus when updating nodes
 - name: Configure Prometheus nodes
   copy:
     content: "{{ prometheus_targets | to_nice_json }}"
     dest: /etc/prometheus/targets.json
+
+# We don't need to restart Prometheus when updating nodes
+- name: Configure Prometheus SNMP devices
+  copy:
+    content: "{{ prometheus_snmp_targets | to_nice_json }}"
+    dest: /etc/prometheus/targets_snmp.json
+
+- name: Activate prometheus service
+  systemd:
+    name: prometheus
+    enabled: yes
+    state: started

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

@@ -29,4 +29,17 @@ scrape_configs:
     file_sd_configs:
       - files:
         - '/etc/prometheus/targets.json'
-
+  - job_name: snmp
+    file_sd_configs:
+      - files:
+        - '/etc/prometheus/targets_snmp.json'
+    metrics_path: /snmp
+    params:
+      module: [if_mib]
+    relabel_configs:
+      - source_labels: [__address__]
+        target_label: __param_target
+      - source_labels: [__param_target]
+        target_label: instance
+      - target_label: __address__
+        replacement: 127.0.0.1:9116