From 8a18c92730504a4e34a41c1ef0ab254c9b035ace Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Sat, 26 Dec 2020 09:44:04 -0600
Subject: [PATCH] roles/collectd-prometheus: Configure plugin

The *collectd-prometheus* role configures the *write_prometheus* plugin
for collectd.  This plugin exposes data collected or received by the
collectd process in the Prometheus Exposition Format over HTTP.  It
provides the same functionality as the "official" collectd Exporter
maintained by the Prometheus team, but integrates natively into the
collectd process, and is much more complete.

The main intent of this role is to provide a mechanism to combine the
collectd data from all Pyrocufflink hosts and insert it into Prometheus.
By configuring the collectd instance on the Prometheus server itself to
enable and use the *write_prometheus* plugin and to receive the
multicast data from other hosts, collectd itself provides the desired
functionality.
---
 roles/collectd-prometheus/defaults/main.yml   |   2 ++
 .../files/collectd-local.pp                   | Bin 0 -> 892 bytes
 roles/collectd-prometheus/handlers/main.yml   |   8 +++++
 roles/collectd-prometheus/tasks/main.yml      |  34 ++++++++++++++++++
 .../templates/collectd-prometheus.conf.j2     |  10 ++++++
 roles/collectd-prometheus/vars/defaults.yml   |   1 +
 6 files changed, 55 insertions(+)
 create mode 100644 roles/collectd-prometheus/defaults/main.yml
 create mode 100644 roles/collectd-prometheus/files/collectd-local.pp
 create mode 100644 roles/collectd-prometheus/handlers/main.yml
 create mode 100644 roles/collectd-prometheus/tasks/main.yml
 create mode 100644 roles/collectd-prometheus/templates/collectd-prometheus.conf.j2
 create mode 100644 roles/collectd-prometheus/vars/defaults.yml

diff --git a/roles/collectd-prometheus/defaults/main.yml b/roles/collectd-prometheus/defaults/main.yml
new file mode 100644
index 0000000..30a73ea
--- /dev/null
+++ b/roles/collectd-prometheus/defaults/main.yml
@@ -0,0 +1,2 @@
+collectd_load_prometheus_plugin: true
+collectd_prometheus_port: 9103
diff --git a/roles/collectd-prometheus/files/collectd-local.pp b/roles/collectd-prometheus/files/collectd-local.pp
new file mode 100644
index 0000000000000000000000000000000000000000..4695d7b181cf49fb616da32291e44dfea1b9ffe6
GIT binary patch
literal 892
zcmb`FK?(vf3`M^RA}&<$0$xDT8@O?&D-SSe?LsY9oDR5{D~RWvmGZU0P@IkUAT&+W
zpS0xuD60kl+5o`qQC58b>&0lfKNZ)}%I^win*fG*(}`;jfbq^*6Lw?g&BnC=%qG)$
zOwdS;ZVYlyQ5p&6oaNpeZD_}CHpbZVYsVb7&x1XQ3R|F0{Pti?$S%5SoiFHf(PU@h
zi?+^_r)EJ^>PS_Hj!~5+Rb<uGh~8^o>+#D|bS{0G)R6U;93j0cP&=(B{ng$1SNvb_
a4V;9}JTjt<vnMmh$<$}O`I!@a@{K1$<2Dlj

literal 0
HcmV?d00001

diff --git a/roles/collectd-prometheus/handlers/main.yml b/roles/collectd-prometheus/handlers/main.yml
new file mode 100644
index 0000000..64ac7b7
--- /dev/null
+++ b/roles/collectd-prometheus/handlers/main.yml
@@ -0,0 +1,8 @@
+- name: install collectd-local selinux module
+  command:
+    semodule -i /var/lib/selinux/collectd-local.pp
+
+- name: restart collectd
+  service:
+    name: collectd
+    state: restarted
diff --git a/roles/collectd-prometheus/tasks/main.yml b/roles/collectd-prometheus/tasks/main.yml
new file mode 100644
index 0000000..93c7d0d
--- /dev/null
+++ b/roles/collectd-prometheus/tasks/main.yml
@@ -0,0 +1,34 @@
+- name: load distribution-specific values
+  include_vars: '{{ item }}'
+  with_first_found:
+  - '{{ ansible_distribution }}.yml'
+  - defaults.yml
+  tags:
+  - always
+
+- name: ensure collectd write_prometheus plugin is installed
+  package:
+    name: '{{ collectd_prometheus_package }}'
+    state: present
+  when: collectd_prometheus_package is not none
+  tags:
+  - install
+
+- name: ensure collectd-local selinux module is installed
+  copy:
+    src: collectd-local.pp
+    dest: /var/lib/selinux/collectd-local.pp
+  notify:
+  - install collectd-local selinux module
+  tags:
+  - selinux
+
+- name: ensure collectd write_prometheus plugin is configured
+  template:
+    src: collectd-prometheus.conf.j2
+    dest: /etc/collectd.d/prometheus.conf
+    mode: '0644'
+  notify:
+  - restart collectd
+  tags:
+  - collectd-config
diff --git a/roles/collectd-prometheus/templates/collectd-prometheus.conf.j2 b/roles/collectd-prometheus/templates/collectd-prometheus.conf.j2
new file mode 100644
index 0000000..8a6369d
--- /dev/null
+++ b/roles/collectd-prometheus/templates/collectd-prometheus.conf.j2
@@ -0,0 +1,10 @@
+{% if collectd_load_prometheus_plugin %}
+LoadPlugin write_prometheus
+
+{% endif %}
+<Plugin write_prometheus>
+    Port {{ collectd_prometheus_port }}
+{% if collectd_prometheus_host is defined %}
+    Host "{{ collectd_prometheus_host }}"
+{% endif %}
+</Plugin>
diff --git a/roles/collectd-prometheus/vars/defaults.yml b/roles/collectd-prometheus/vars/defaults.yml
new file mode 100644
index 0000000..ec78586
--- /dev/null
+++ b/roles/collectd-prometheus/vars/defaults.yml
@@ -0,0 +1 @@
+collectd_prometheus_package: collectd-write_prometheus