From c00b5f854e1e74555620cda657052250dd8058a3 Mon Sep 17 00:00:00 2001
From: Markus Hauschild <markus@moepman.eu>
Date: Thu, 19 Jul 2018 16:29:44 +0200
Subject: [PATCH] Add new prometheus/grafana roles

---
 group_vars/all/vars.yml                      |  8 +++++
 hosts                                        |  1 +
 roles/grafana/tasks/main.yml                 | 10 ++++++
 roles/prometheus/handlers/main.yml           |  3 ++
 roles/prometheus/tasks/main.yml              | 14 +++++++++
 roles/prometheus/templates/prometheus.yml.j2 | 33 ++++++++++++++++++++
 site.yml                                     |  6 ++++
 7 files changed, 75 insertions(+)
 create mode 100644 roles/grafana/tasks/main.yml
 create mode 100644 roles/prometheus/handlers/main.yml
 create mode 100644 roles/prometheus/tasks/main.yml
 create mode 100644 roles/prometheus/templates/prometheus.yml.j2

diff --git a/group_vars/all/vars.yml b/group_vars/all/vars.yml
index 2ba249b..d9387c7 100644
--- a/group_vars/all/vars.yml
+++ b/group_vars/all/vars.yml
@@ -25,6 +25,14 @@ gre_matrix:
  - { id: 26, a: gw21, b: gw31 }
 # - { id: 33, a: gw22, b: gw31 }
 
+node_targets:
+- gw11.regensburg.freifunk.net:9100
+- gw21.regensburg.freifunk.net:9100
+- gw31.regensburg.freifunk.net:9100
+- confluence.regensburg.freifunk.net:9100
+- stats.ffrgb:9100
+- unms.ffrgb:9100
+
 ntp_servers:
 - 0.de.pool.ntp.org
 - 1.de.pool.ntp.org
diff --git a/hosts b/hosts
index 4daaa80..e4c8504 100644
--- a/hosts
+++ b/hosts
@@ -3,4 +3,5 @@ gw11.regensburg.freifunk.net
 gw21.regensburg.freifunk.net
 gw31.regensburg.freifunk.net
 confluence.regensburg.freifunk.net
+stats.ffrgb ansible_host=10.90.224.100
 unms.ffrgb ansible_host=10.90.224.101
diff --git a/roles/grafana/tasks/main.yml b/roles/grafana/tasks/main.yml
new file mode 100644
index 0000000..6975180
--- /dev/null
+++ b/roles/grafana/tasks/main.yml
@@ -0,0 +1,10 @@
+---
+
+- name: Enable grafana apt-key
+  apt_key: url='https://packagecloud.io/gpg.key'
+
+- name: Enable grafana repository
+  apt_repository: repo='deb https://packagecloud.io/grafana/stable/debian/ stretch main'
+
+- name: Install grafana
+  apt: name=grafana
diff --git a/roles/prometheus/handlers/main.yml b/roles/prometheus/handlers/main.yml
new file mode 100644
index 0000000..961a5ce
--- /dev/null
+++ b/roles/prometheus/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: Restart prometheus
+  service: name=prometheus state=restarted
diff --git a/roles/prometheus/tasks/main.yml b/roles/prometheus/tasks/main.yml
new file mode 100644
index 0000000..c28df74
--- /dev/null
+++ b/roles/prometheus/tasks/main.yml
@@ -0,0 +1,14 @@
+---
+
+- name: Enable backports for prometheus
+  apt_repository: repo='deb http://httpredir.debian.org/debian stretch-backports main'
+
+- name: Install prometheus
+  apt: name=prometheus default_release='stretch-backports'
+
+- name: Configure prometheus
+  template: src=prometheus.yml.j2 dest=/etc/prometheus/prometheus.yml
+  notify: Restart prometheus
+
+- name: Enable prometheus
+  service: name=prometheus enabled=yes
diff --git a/roles/prometheus/templates/prometheus.yml.j2 b/roles/prometheus/templates/prometheus.yml.j2
new file mode 100644
index 0000000..bac1557
--- /dev/null
+++ b/roles/prometheus/templates/prometheus.yml.j2
@@ -0,0 +1,33 @@
+# Sample config for Prometheus.
+
+global:
+  scrape_interval:     60s
+  evaluation_interval: 60s
+  # scrape_timeout is set to the global default (10s).
+
+  # Attach these labels to any time series or alerts when communicating with
+  # external systems (federation, remote storage, Alertmanager).
+  external_labels:
+      monitor: 'example'
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets:
+      # - localhost:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  - job_name: node
+    static_configs:
+      - targets:
+{% for target in node_targets %}
+        - {{ target }}
+{% endfor %}
diff --git a/site.yml b/site.yml
index eb476e3..faeddee 100644
--- a/site.yml
+++ b/site.yml
@@ -29,3 +29,9 @@
   hosts: confluence.regensburg.freifunk.net
   roles:
   - confluence
+
+- name: Setup stats server
+  hosts: stats.ffrgb
+  roles:
+  - prometheus
+  - grafana