feat(exporters): added node_exporter

docs/README.rst

@@ -92,3 +92,9 @@ dependency on ``prometheus.service.clean`` via include list.
 This state will remove the prometheus package and has a depency on
 ``prometheus.config.clean`` via include list.
 
+``prometheus.exporters``
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+This state will manage prometheus exporters according to Pillar ``prometheus:exporters``.
+It includes sub-states like ``prometheus.exporters.node``.
+If you don't want to use Pillar data for this you may use the sub-states directly.

kitchen.yml

@@ -42,6 +42,7 @@ provisioner:
     base:
       '*':
         - prometheus
+        - prometheus.exporters
   pillars:
     top.sls:
       base:

pillar.example

@@ -62,3 +62,8 @@ prometheus:
 
         static_configs:
         - targets: ['localhost:9090']
+
+  exporters:
+    node:
+      args:
+        web.listen-address: ":9110"

prometheus/defaults.yaml

@@ -9,3 +9,7 @@ prometheus:
   service:
     name: prometheus
     sysrc: False
+  exporters:
+    node:
+      pkg: prometheus-node-exporter
+      service: prometheus-node-exporter

prometheus/exporters/init.sls

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+# vim: ft=sls
+
+{#- Get the `tplroot` from `tpldir` #}
+{%- set tplroot = tpldir.split('/')[0] %}
+{%- set sls_config_file = tplroot ~ '.config.file' %}
+{%- from tplroot ~ "/map.jinja" import prometheus with context %}
+
+{%- if prometheus.exporters.keys()|length > 0 %}
+include:
+{%-   for name in prometheus.exporters.keys()|list %}
+  - .{{ name }}
+{%-   endfor %}
+{%- endif %}

prometheus/exporters/node/clean.sls

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+# vim: ft=sls
+
+{#- Get the `tplroot` from `tpldir` #}
+{%- set tplroot = tpldir.split('/')[0] %}
+{%- from tplroot ~ "/map.jinja" import prometheus with context %}
+
+prometheus-exporters-node-service-dead:
+  service.dead:
+    - name: {{ prometheus.exporters.node.service }}
+    - enable: False
+
+prometheus-exporters-node-pkg-removed:
+  pkg.removed:
+    - name: {{ prometheus.exporters.node.pkg }}
+    - require:
+      - service: prometheus-exporters-node-service-dead
+
+{# FreeBSD #}
+{%- if salt['grains.get']('os_family') == 'FreeBSD' %}
+{%-   for parameter in ['args', 'listen_address', 'textfile_dir'] %}
+prometheus-exporters-node-args-{{ parameter }}:
+  sysrc.absent:
+    - name: node_exporter_{{ parameter }}
+    - require:
+      - service: prometheus-exporters-node-service-dead
+{%-   endfor %}
+{%- endif %}

prometheus/exporters/node/init.sls

@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+# vim: ft=sls
+
+{#- Get the `tplroot` from `tpldir` #}
+{%- set tplroot = tpldir.split('/')[0] %}
+{%- from tplroot ~ "/map.jinja" import prometheus with context %}
+
+{%- macro concat_args(args) %}
+{%-   if args|length > 0 %}
+{%-     for k,v in args -%}
+{%-       if not k or not v %}{% continue %}{% endif -%}
+          --{{ k }}={{ v }}
+{%-       if not loop.last %} {% endif -%}
+{%-     endfor -%}
+{%-   endif -%}
+{%- endmacro %}
+
+prometheus-exporters-node-pkg-installed:
+  pkg.installed:
+    - name: {{ prometheus.exporters.node.pkg }}
+
+{%- if 'args' in prometheus.exporters.node %}
+{%-   set args = prometheus.exporters.node.get('args', {}) -%}
+
+{# FreeBSD #}
+{%-   if salt['grains.get']('os_family') == 'FreeBSD' %}
+{%-     if 'web.listen-address' in args.keys() %}
+{%-       set value = args.pop('web.listen-address') %}
+prometheus-exporters-node-args-web-listen-address:
+  sysrc.managed:
+    - name: node_exporter_listen_address
+    - value: {{ value }}
+    - watch_in:
+      - service: prometheus-exporters-node-service-running
+{%-     endif %}
+
+{%-     if 'collector.textfile.directory' in args.keys() %}
+{%-       set value = args.pop('collector.textfile.directory') %}
+prometheus-exporters-node-args-collector-textfile-directory:
+  sysrc.managed:
+    - name: node_exporter_textfile_dir
+    - value: {{ value }}
+    - watch_in:
+      - service: prometheus-exporters-node-service-running
+{%-     endif %}
+
+prometheus-exporters-node-args:
+  sysrc.managed:
+    - name: node_exporter_args
+    # service node_exporter restart tended to hang on FreeBSD
+    # https://github.com/saltstack/salt/issues/44848#issuecomment-487016414
+    - value: "{{ concat_args(args|dictsort) }} >/dev/null 2>&1"
+    - watch_in:
+      - service: prometheus-exporters-node-service-running
+
+{# Debian #}
+{%-   elif salt['grains.get']('os_family') == 'Debian'%}
+prometheus-exporters-node-args:
+  file.managed:
+    - name: {{ prometheus.exporters.node.config_file }}
+    - contents: |
+        ARGS="{{ concat_args(args) }}"
+    - watch_in:
+      - service: prometheus-exporters-node-service-running
+{%-   endif %}
+{%- endif %}
+
+prometheus-exporters-node-service-running:
+  service.running:
+    - name: {{ prometheus.exporters.node.service }}
+    - enable: True
+    - watch:
+      - pkg: prometheus-exporters-node-pkg-installed

prometheus/osfamilymap.yaml

@@ -10,7 +10,10 @@
 # you will need to provide at least an empty dict in this file, e.g.
 # osfamilymap: {}
 ---
-Debian: {}
+Debian:
+  exporters:
+    node:
+      config_file: /etc/default/prometheus-node-exporter
 
 RedHat: {}
 
@@ -27,6 +30,10 @@ FreeBSD:
   config_file: /usr/local/etc/prometheus.yml
   service:
     sysrc: True
+  exporters:
+    node:
+      pkg: node_exporter
+      service: node_exporter
 
 OpenBSD:
   rootgroup: wheel

test/integration/default/controls/packages_spec.rb

@@ -4,4 +4,8 @@ control 'Prometheus package' do
   describe package('prometheus') do
     it { should be_installed }
   end
+
+  describe package('prometheus-node-exporter') do
+    it { should be_installed }
+  end
 end

test/integration/default/controls/services_spec.rb

@@ -6,4 +6,9 @@ control 'Prometheus service' do
     it { should be_enabled }
     it { should be_running }
   end
+
+  describe service('prometheus-node-exporter') do
+    it { should be_enabled }
+    it { should be_running }
+  end
 end