From 35fb88969a6cb85d8ba7541820acf3b0ff891055 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Mon, 31 May 2021 22:41:50 +0200
Subject: prometheus: initial node exporter role

---
 .../prometheus/exporter/base/templates/service.j2  |  1 +
 .../prometheus/exporter/node/defaults/main.yml     |  5 +++
 .../prometheus/exporter/node/handlers/main.yml     |  6 ++++
 .../prometheus/exporter/node/tasks/main.yml        | 36 ++++++++++++++++++++--
 .../prometheus/exporter/node/templates/service.j2  | 10 ++++++
 5 files changed, 55 insertions(+), 3 deletions(-)
 create mode 100644 roles/monitoring/prometheus/exporter/node/defaults/main.yml
 create mode 100644 roles/monitoring/prometheus/exporter/node/templates/service.j2

(limited to 'roles/monitoring')

diff --git a/roles/monitoring/prometheus/exporter/base/templates/service.j2 b/roles/monitoring/prometheus/exporter/base/templates/service.j2
index 6069fc79..e2c54d6c 100644
--- a/roles/monitoring/prometheus/exporter/base/templates/service.j2
+++ b/roles/monitoring/prometheus/exporter/base/templates/service.j2
@@ -5,6 +5,7 @@ Description=Prometheus exporter proxy
 Restart=always
 User=prometheus-exporter
 ExecStart=/usr/bin/prometheus-exporter-exporter --config.dirs=/etc/prometheus/exporter/enabled --config.file="" --web.listen-address="{{ prometheus_exporter_listen }}"
+{# TODO: implement reloading once the exporter_exporter supports this #}
 
 # systemd hardening-options
 AmbientCapabilities=
diff --git a/roles/monitoring/prometheus/exporter/node/defaults/main.yml b/roles/monitoring/prometheus/exporter/node/defaults/main.yml
new file mode 100644
index 00000000..5eff7844
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/defaults/main.yml
@@ -0,0 +1,5 @@
+---
+prometheus_exporter_node_disable_collectors: []
+
+prometheus_exporter_node_extra_collectors:
+- ntp
diff --git a/roles/monitoring/prometheus/exporter/node/handlers/main.yml b/roles/monitoring/prometheus/exporter/node/handlers/main.yml
index 9c62baf6..3e1b2000 100644
--- a/roles/monitoring/prometheus/exporter/node/handlers/main.yml
+++ b/roles/monitoring/prometheus/exporter/node/handlers/main.yml
@@ -3,3 +3,9 @@
   service:
     name: prometheus-node-exporter
     state: restarted
+
+- name: reload prometheus-exporter-exporter
+  service:
+    name: prometheus-exporter-exporter
+    ## TODO: implement reload once exporter_exporter supports this...
+    state: restarted
diff --git a/roles/monitoring/prometheus/exporter/node/tasks/main.yml b/roles/monitoring/prometheus/exporter/node/tasks/main.yml
index 0758eb3f..694dafb0 100644
--- a/roles/monitoring/prometheus/exporter/node/tasks/main.yml
+++ b/roles/monitoring/prometheus/exporter/node/tasks/main.yml
@@ -1,9 +1,39 @@
 ---
+- name: check if prometheus apt component of spreadspace repo is enabled
+  assert:
+    msg: "please enable the 'prometheus' component of spreadspace repo using 'spreadspace_apt_repo_components'"
+    that:
+    - spreadspace_apt_repo_components is defined
+    - "'prometheus' in spreadspace_apt_repo_components"
+
 - name: install apt packages
   apt:
     name: prom-exporter-node
     state: present
 
-## TODO:
-## - systemd service unit
-## - add snippet to exporter-exporter config-dir
+- name: create directory for textfile collector
+  file:
+    path: /var/lib/prometheus-node-exporter/textfile-collector
+    state: directory
+
+- name: generate systemd service unit
+  template:
+    src: service.j2
+    dest: /etc/systemd/system/prometheus-node-exporter.service
+  notify: restart prometheus-node-exporter
+
+- name: make sure prometheus-exporter-exporter is enabled and started
+  systemd:
+    name: prometheus-node-exporter.service
+    daemon_reload: yes
+    state: started
+    enabled: yes
+
+- name: register exporter
+  copy:
+    content: |
+      method: http
+      http:
+        port: 9100
+    dest: /etc/prometheus/exporter/enabled/node.yml
+  notify: reload prometheus-exporter-exporter
diff --git a/roles/monitoring/prometheus/exporter/node/templates/service.j2 b/roles/monitoring/prometheus/exporter/node/templates/service.j2
new file mode 100644
index 00000000..c3b46472
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/templates/service.j2
@@ -0,0 +1,10 @@
+[Unit]
+Description=Prometheus exporter
+
+[Service]
+Restart=always
+User=prometheus-exporter
+ExecStart=/usr/bin/prometheus-node-exporter --web.listen-address="127.0.0.1:9100" --web.disable-exporter-metrics --collector.textfile.directory="/var/lib/prometheus-node-exporter/textfile-collector" {% for collector in prometheus_exporter_node_disable_collectors %} --no-collector.{{ collector }}{% endfor %}{% for collector in prometheus_exporter_node_extra_collectors %} --collector.{{ collector }}{% endfor %}{{ '' }}
+
+[Install]
+WantedBy=multi-user.target
-- 
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