From 3cb0ab71de09c1836d1b72840998cea2a140d141 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Tue, 8 Dec 2020 23:09:03 +0100
Subject: add basic prometheus exporter roles

---
 .../prometheus/exporter/base/defaults/main.yml     |  2 ++
 .../prometheus/exporter/base/tasks/main.yml        | 16 ++++++++++++
 .../exporter/base/templates/nginx-vhost.conf.j2    | 15 +++++++++++
 .../prometheus/exporter/node/handlers/main.yml     |  5 ++++
 .../prometheus/exporter/node/tasks/main.yml        | 29 ++++++++++++++++++++++
 5 files changed, 67 insertions(+)
 create mode 100644 roles/monitoring/prometheus/exporter/base/defaults/main.yml
 create mode 100644 roles/monitoring/prometheus/exporter/base/tasks/main.yml
 create mode 100644 roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2
 create mode 100644 roles/monitoring/prometheus/exporter/node/handlers/main.yml
 create mode 100644 roles/monitoring/prometheus/exporter/node/tasks/main.yml

(limited to 'roles')

diff --git a/roles/monitoring/prometheus/exporter/base/defaults/main.yml b/roles/monitoring/prometheus/exporter/base/defaults/main.yml
new file mode 100644
index 00000000..5f8ce103
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/defaults/main.yml
@@ -0,0 +1,2 @@
+---
+prometheus_exporter_port: 9000
diff --git a/roles/monitoring/prometheus/exporter/base/tasks/main.yml b/roles/monitoring/prometheus/exporter/base/tasks/main.yml
new file mode 100644
index 00000000..c3a04bd9
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/tasks/main.yml
@@ -0,0 +1,16 @@
+---
+- name: create main configuration directories
+  loop:
+  - exporters-available
+  - exporters-enabled
+  file:
+    path: "/etc/prometheus-exporter/{{ item }}"
+    state: directory
+
+- name: install nginx vhost
+  vars:
+    nginx_vhost:
+      name: prometheus-exporter
+      content: "{{ lookup('template', 'nginx-vhost.conf.j2') }}"
+  include_role:
+    name: nginx/vhost
diff --git a/roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2 b/roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2
new file mode 100644
index 00000000..e032ca3d
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/base/templates/nginx-vhost.conf.j2
@@ -0,0 +1,15 @@
+server {
+  listen {{ prometheus_exporter_port }};
+  listen [::]:{{ prometheus_exporter_port }};
+  server_name _;
+
+  ## TODO: configure ssl
+
+  location / {
+     return 404 "unknown exporter: $uri\n";
+  }
+  include /etc/prometheus-exporter/exporters-enabled/*;
+
+  access_log /var/log/nginx/access-prometheus-exporter.log;
+  error_log /var/log/nginx/error-prometheus-exporter.log;
+}
diff --git a/roles/monitoring/prometheus/exporter/node/handlers/main.yml b/roles/monitoring/prometheus/exporter/node/handlers/main.yml
new file mode 100644
index 00000000..9c62baf6
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/handlers/main.yml
@@ -0,0 +1,5 @@
+---
+- name: restart prometheus-node-exporter
+  service:
+    name: prometheus-node-exporter
+    state: restarted
diff --git a/roles/monitoring/prometheus/exporter/node/tasks/main.yml b/roles/monitoring/prometheus/exporter/node/tasks/main.yml
new file mode 100644
index 00000000..286b6d75
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/tasks/main.yml
@@ -0,0 +1,29 @@
+---
+- name: install apt packages
+  apt:
+    name: prometheus-node-exporter
+    state: present
+
+  ## TODO: add other configs
+- name: listen on localhost only
+  lineinfile:
+    path: /etc/default/prometheus-node-exporter
+    regexp: '^ARGS='
+    line: 'ARGS="--web.listen-address=127.0.0.1:9100"'
+  notify: restart prometheus-node-exporter
+
+- name: create nginx snippet
+  copy:
+    content: |
+      location = /node {
+        proxy_pass http://127.0.0.1:9100/metrics;
+      }
+    dest: /etc/prometheus-exporter/exporters-available/node
+  # notify: reload nginx
+
+- name: enable nginx snippet
+  file:
+    src: /etc/prometheus-exporter/exporters-available/node
+    dest: /etc/prometheus-exporter/exporters-enabled/node
+    state: link
+  # notify: reload nginx
-- 
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