Added redis_exporter module

README.md

@@ -25,7 +25,7 @@ This module automates the install and configuration of Prometheus monitoring too
 * Installs a configuration file for prometheus daemon (/etc/prometheus/prometheus.yaml) or for alertmanager (/etc/prometheus/alert.rules)
 * Manages the services via upstart, sysv, or systemd
 * Optionally creates alert rules
-* The following exporters are currently implemented: node_exporter, statsd_exporter, process_exporter, haproxy_exporter, mysqld_exporter, blackbox_exporter, consul_exporter
+* The following exporters are currently implemented: node_exporter, statsd_exporter, process_exporter, haproxy_exporter, mysqld_exporter, blackbox_exporter, consul_exporter, redis_exporter
 
 ## Usage
 

manifests/params.pp

@@ -195,6 +195,15 @@
   $blackbox_exporter_modules = {}
   $blackbox_exporter_config_file = '/etc/blackbox-exporter.yaml'
   $blackbox_exporter_version = '0.7.0'
+  $redis_exporter_redis_address = ['redis://localhost:6379']
+  $redis_exporter_download_extension = 'tar.gz'
+  $redis_exporter_download_url_base = 'https://github.com/oliver006/redis_exporter/releases'
+  $redis_exporter_extra_groups = []
+  $redis_exporter_group = 'redis-exporter'
+  $redis_exporter_package_ensure = 'latest'
+  $redis_exporter_package_name = 'redis_exporter'
+  $redis_exporter_user = 'redis-exporter'
+  $redis_exporter_version = '0.11.2'
   $user = 'prometheus'
   $version = '1.5.2'
   case $::architecture {

manifests/redis_exporter.pp

@@ -0,0 +1,176 @@
+# Class: prometheus::redis_exporter
+#
+# This module manages prometheus node redis_exporter
+#
+# Parameters:
+#  [*arch*]
+#  Architecture (amd64 or i386)
+#
+
+#  [*bin_dir*]
+#  Directory where binaries are located
+#
+#  [*addr*]
+#  Array of address of one or more redis nodes. Defaults to redis://localhost:6379
+#
+#  [*download_extension*]
+#  Extension for the release binary archive
+#
+#  [*download_url*]
+#  Complete URL corresponding to the where the release binary archive can be downloaded
+#
+#  [*download_url_base*]
+#  Base URL for the binary archive
+#
+#  [*extra_groups*]
+#  Extra groups to add the binary user to
+#
+#  [*extra_options*]
+#  Extra options added to the startup command
+#  For a full list of the exporter's supported extra options
+#  please refer to https://github.com/oliver006/redis_exporter
+#
+#  [*group*]
+#  Group under which the binary is running
+#
+#  [*init_style*]
+#  Service startup scripts style (e.g. rc, upstart or systemd)
+#
+#  [*install_method*]
+#  Installation method: url or package (only url is supported currently)
+#
+#  [*manage_group*]
+#  Whether to create a group for or rely on external code for that
+#
+#  [*manage_service*]
+#  Should puppet manage the service? (default true)
+#
+#  [*manage_user*]
+#  Whether to create user or rely on external code for that
+#
+#  [*namespace*]
+#  Namespace for the metrics, defaults to `redis`.
+#
+#  [*os*]
+#  Operating system (linux is the only one supported)
+#
+#  [*package_ensure*]
+#  If package, then use this for package ensure default 'latest'
+#
+#  [*package_name*]
+#  The binary package name - not available yet
+#
+#  [*purge_config_dir*]
+#  Purge config files no longer generated by Puppet
+#
+#  [*restart_on_change*]
+#  Should puppet restart the service on configuration change? (default true)
+#
+#  [*service_enable*]
+#  Whether to enable the service from puppet (default true)
+#
+#  [*service_ensure*]
+#  State ensured for the service (default 'running')
+#
+#  [*service_name*]
+#  Name of the node exporter service (default 'redis_exporter')
+#
+#  [*user*]
+#  User which runs the service
+#
+#  [*version*]
+#  The binary release version
+class prometheus::redis_exporter (
+  Array[String]    $addr                = $::prometheus::params::redis_exporter_redis_address,
+  String           $arch                = $::prometheus::params::arch,
+  String           $bin_dir             = $::prometheus::params::bin_dir,
+  String           $download_extension  = $::prometheus::params::redis_exporter_download_extension,
+  Optional[String] $download_url        = undef,
+  String           $download_url_base   = $::prometheus::params::redis_exporter_download_url_base,
+  Array[String]    $extra_groups        = $::prometheus::params::redis_exporter_extra_groups,
+  String           $extra_options       = '',
+  String           $group               = $::prometheus::params::redis_exporter_group,
+  String           $init_style          = $::prometheus::params::init_style,
+  String           $install_method      = $::prometheus::params::install_method,
+  Boolean          $manage_group        = true,
+  Boolean          $manage_service      = true,
+  Boolean          $manage_user         = true,
+  String           $namespace           = 'redis',
+  String           $os                  = $::prometheus::params::os,
+  String           $package_ensure      = $::prometheus::params::redis_exporter_package_ensure,
+  String           $package_name        = $::prometheus::params::redis_exporter_package_name,
+  Boolean          $purge_config_dir    = true,
+  Boolean          $restart_on_change   = true,
+  Boolean          $service_enable      = true,
+  String           $service_ensure      = 'running',
+  String           $service_name        = 'redis_exporter',
+  String           $user                = $::prometheus::params::redis_exporter_user,
+  String           $version             = $::prometheus::params::redis_exporter_version,
+) inherits prometheus::params {
+
+  $release = "v${version}"
+
+  $real_download_url = pick($download_url, "${download_url_base}/download/${release}/${package_name}-${release}.${os}-${arch}.${download_extension}")
+  $notify_service = $restart_on_change ? {
+    true    => Service[$service_name],
+    default => undef,
+  }
+
+  $str_addresses = join($addr, ',')
+  $options = "-redis.addr=${str_addresses} -namespace=${namespace} ${extra_options}"
+
+  if $install_method == 'url' {
+    # Not a big fan of copypasting but prometheus::daemon takes for granted
+    # a specific path embedded in the prometheus *_exporter tarball, which
+    # redis_exporter lacks.
+    # TODO: patch prometheus::daemon to support custom extract directories
+    $exporter_install_method = 'none'
+    file { "/opt/${service_name}-${version}.${os}-${arch}":
+      ensure => 'directory',
+      owner  => 'root',
+      group  => 0, # 0 instead of root because OS X uses "wheel".
+      mode   => '0555',
+    }
+    -> archive { "/tmp/${service_name}-${version}.${download_extension}":
+      ensure          => present,
+      extract         => true,
+      extract_path    => "/opt/${service_name}-${version}.${os}-${arch}",
+      source          => $real_download_url,
+      checksum_verify => false,
+      creates         => "/opt/${name}-${version}.${os}-${arch}/${name}",
+      cleanup         => true,
+    }
+    -> file { "${bin_dir}/${service_name}":
+      ensure => link,
+      notify => $notify_service,
+      target => "/opt/${service_name}-${version}.${os}-${arch}/${service_name}",
+      before => Prometheus::Daemon[$service_name],
+    }
+  } else {
+    $exporter_install_method = $install_method
+  }
+
+  prometheus::daemon { $service_name:
+    install_method     => $exporter_install_method,
+    version            => $version,
+    download_extension => $download_extension,
+    os                 => $os,
+    arch               => $arch,
+    bin_dir            => $bin_dir,
+    notify_service     => $notify_service,
+    package_name       => $package_name,
+    package_ensure     => $package_ensure,
+    manage_user        => $manage_user,
+    user               => $user,
+    extra_groups       => $extra_groups,
+    real_download_url  => $real_download_url,
+    group              => $group,
+    manage_group       => $manage_group,
+    purge              => $purge_config_dir,
+    options            => $options,
+    init_style         => $init_style,
+    service_ensure     => $service_ensure,
+    service_enable     => $service_enable,
+    manage_service     => $manage_service,
+  }
+}

spec/classes/redis_exporter_spec.rb

@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+describe 'prometheus::redis_exporter' do
+  on_supported_os.each do |os, facts|
+    context "on #{os}" do
+      let(:facts) do
+        facts
+      end
+
+      context 'with version specified' do
+        let(:params) do
+          {
+            version: '0.11.2',
+            arch: 'amd64',
+            os: 'linux'
+          }
+        end
+
+        describe 'install correct binary' do
+          it { is_expected.to contain_file('/usr/local/bin/redis_exporter').with('target' => '/opt/redis_exporter-0.11.2.linux-amd64/redis_exporter') }
+        end
+      end
+    end
+  end
+end