add varnish exporter

README.md

@@ -13,7 +13,7 @@ Role variables
 --------------
 
 | Variable                                     | Type    | Choices                                                                    | Default     | Comment         |
-|----------------------------------------------|---------|------------------------------------------------------------------|-------------|-----------------|
+|----------------------------------------------|---------|----------------------------------------------------------------------------|-------------|-----------------|
 | prometheus_server_enable                     | string  | true / false                                                               |             |                 |
 | prometheus_server_version                    | string  |                                                                            |  latest     |                 |
 | prometheus_server_monitor                    | string  |                                                                            |             |                 |
@@ -22,7 +22,7 @@ Role variables
 | prometheus_server_job_name                   | string  |                                                                            |  prometheus |                 |
 | prometheus_server_scrape_interval            | string  |                                                                            |  5          |                 |
 | prometheus_server_scrape_timeout             | string  |                                                                            |  5          |                 |
-| prometheus_exporter_packages                 | list    | node / mysqld / postgresql / mongodb / phpfpm / apache / haproxy |             |                 |
+| prometheus_exporter_packages                 | list    | node / mysqld / postgresql / mongodb / phpfpm / apache / haproxy / varnish |             |                 |
 | prometheus_node_exporter_targets             | list    |                                                                            |             |                 |
 | prometheus_mysqld_exporter_targets           | list    |                                                                            |             |                 |
 | prometheus_mongodb_exporter_targets          | list    |                                                                            |             |                 |

handlers/main.yml

@@ -46,3 +46,10 @@
     state: restarted
     enabled: yes
   tags: ['prometheus']
+
+- name: 'prometheus | varnish exporter | restart service'
+  systemd:
+    name: prometheus-varnish-exporter.service
+    state: restarted
+    enabled: yes
+  tags: ['prometheus']

tasks/main.yml

@@ -39,3 +39,8 @@
   include_tasks: 'apache_exporter.yml'
   when:
     - "'apache' in prometheus_exporter_packages"
+
+- name: 'prometheus | Varnish exporter'
+  include_tasks: 'varnish_exporter.yml'
+  when:
+    - "'varnish' in prometheus_exporter_packages"

tasks/varnish_exporter.yml

@@ -0,0 +1,43 @@
+---
+- name: 'prometheus | varnish exporter | get latest release from GitHub'
+  shell: curl --silent "https://api.github.com/repos/jonnenauha/prometheus_varnish_exporter/releases/latest" | jq -r .tag_name | sed "s/v//"
+  args:
+    warn: false
+  register: prometheus_varnish_exporter_latest_version
+  run_once: true
+
+- name: 'prometheus | varnish exporter | download'
+  get_url:
+    url: https://github.com/jonnenauha/prometheus_varnish_exporter/releases/download/v{{ prometheus_varnish_exporter_version|default(prometheus_varnish_exporter_latest_version.stdout) }}/varnish_exporter-{{ prometheus_varnish_exporter_version|default(prometheus_varnish_exporter_latest_version.stdout) }}.linux-amd64.tar.gz
+    dest: /tmp
+
+- name: 'prometheus | varnish exporter | unarchive'
+  unarchive:
+    remote_src: yes
+    src: /tmp/varnish_exporter-{{ prometheus_varnish_exporter_version|default(prometheus_varnish_exporter_latest_version.stdout) }}.linux-amd64.tar.gz
+    dest: /tmp
+
+- name: 'prometheus | varnish exporter | move to /usr/local/bin'
+  copy:
+    src: /tmp/varnish_exporter-{{ prometheus_varnish_exporter_version|default(prometheus_varnish_exporter_latest_version.stdout) }}.linux-amd64/varnish_exporter
+    dest: /usr/local/bin/prometheus-varnish-exporter
+    remote_src: yes
+    owner: root
+    group: root
+    mode: 0755
+  notify:
+    - 'prometheus | varnish exporter | restart service'
+
+- name: 'prometheus | varnish exporter | install unit file to systemd'
+  template:
+    src: systemd/prometheus-varnish-exporter.service.j2
+    dest: /etc/systemd/system/prometheus-varnish-exporter.service
+    owner: root
+    group: root
+    mode: 0600
+
+- name: 'prometheus | varnish exporter | configure systemd to use service'
+  systemd:
+    daemon_reload: yes
+    enabled: yes
+    name: prometheus-varnish-exporter.service

templates/conf/prometheus.yml.j2

@@ -107,3 +107,14 @@ scrape_configs:
         - {{ target }}:8404
 {% endfor %}
 {% endif %}
+
+{% if prometheus_varnish_exporter_targets is defined %}
+  - job_name: varnish
+    scrape_interval: 30s
+    scrape_timeout: 10s
+    static_configs:
+      - targets:
+{% for target in prometheus_varnish_exporter_targets %}
+        - {{ target }}:9131
+{% endfor %}
+{% endif %}