feat: create exporters module

- upgrade node_exporter, bring managed under exporters module
- upgrade postgres_exporter, bring managed under exporters module
- add flag to cleanup previous iterations of exporters from prometheus module
- fix issues with vmclusster: replication + dedup

modules/exporters/manifests/node_exporter.pp

@@ -0,0 +1,81 @@
+class exporters::node_exporter (
+  Boolean $enable         = false,
+  String  $user           = 'node_exporter',
+  String  $group          = 'node_exporter',
+  Boolean $manage_user    = true,
+  Boolean $manage_service = true,
+  Stdlib::Port $port      = 9100,
+  Stdlib::Absolutepath $exec_path     = '/usr/bin/node_exporter',
+  Boolean $cleanup_old_node_exporter  = false,
+){
+
+  if $cleanup_old_node_exporter {
+    # remove the symlink
+    file {'/usr/local/bin/node_exporter':
+      ensure => absent
+    }
+    # remove the /opt/node_exporter-1.8.1.linux-amd64 directory
+    file {'/opt/node_exporter-1.8.1.linux-amd64':
+      ensure  => absent,
+      recurse => true,
+      force   => true,
+    }
+  }
+
+  if $enable {
+
+    # install required package
+    package {'node_exporter':
+      ensure => installed,
+    }
+
+    # manage the user/group
+    if $manage_user {
+      group { $group:
+        ensure => present,
+      }
+
+      user { $user:
+        ensure     => present,
+        shell      => '/usr/sbin/nologin',
+        groups     => $group,
+        managehome => true,
+      }
+    }
+
+    # manage the systemd service
+    if $manage_service {
+
+      # Use these in notifications or file resources
+      systemd::unit_file { 'node_exporter.service':
+        content   => template('exporters/node_exporter.service.erb'),
+        enable    => true,
+        active    => true,
+        subscribe => Package['node_exporter'],
+      }
+    }
+
+    # manage consul service
+    consul::service { 'node_exporter':
+      service_name => 'node_exporter',
+      address      => $facts['networking']['ip'],
+      port         => $port,
+      tags         => [
+        'metrics',
+        'metrics_scheme=http',
+        'metrics_job=node',
+      ],
+      checks       => [
+        {
+          id              => 'node_exporter_http_check',
+          name            => 'node_exporter HTTP Check',
+          http            => "http://${facts['networking']['fqdn']}:${port}",
+          method          => 'GET',
+          tls_skip_verify => true,
+          interval        => '10s',
+          timeout         => '1s',
+        },
+      ],
+    }
+  }
+}

modules/exporters/manifests/postgres_exporter.pp

@@ -0,0 +1,95 @@
+class exporters::postgres_exporter (
+  String        $db_pass,
+  String        $db_user  = 'postgres_exporter',
+  Stdlib::Host  $db_host  = $facts['networking']['ip'],
+  Stdlib::Port  $db_port  = 5432,
+  Boolean $enable         = false,
+  String  $user           = 'postgres_exporter',
+  String  $group          = 'postgres_exporter',
+  Boolean $manage_user    = true,
+  Boolean $manage_service = true,
+  Stdlib::Port $port      = 9187,
+  Stdlib::Absolutepath $exec_path     = '/usr/bin/postgres_exporter',
+  Stdlib::Absolutepath $vars_path     = '/etc/sysconfig/postgres_exporter',
+  Boolean $cleanup_old_postgres_exporter  = false,
+){
+
+  if $cleanup_old_postgres_exporter {
+    # remove the symlink
+    file {'/usr/local/bin/postgres_exporter':
+      ensure => absent
+    }
+    # remove the /opt/postgres_exporter-0.5.1.linux-amd64 directory
+    file {'/opt/postgres_exporter-0.5.1.linux-amd64':
+      ensure  => absent,
+      recurse => true,
+      force   => true,
+    }
+  }
+
+  if $enable {
+
+    # install required package
+    package {'postgres_exporter':
+      ensure => installed,
+    }
+
+    # manage the user/group
+    if $manage_user {
+      group { $group:
+        ensure => present,
+      }
+
+      user { $user:
+        ensure     => present,
+        shell      => '/usr/sbin/nologin',
+        groups     => $group,
+        managehome => true,
+      }
+    }
+
+    # manage the environment file
+    file { $vars_path:
+      ensure  => file,
+      owner   => 'root',
+      group   => 'root',
+      mode    => '0644',
+      content => template('exporters/postgres_exporter_sysconfig.erb')
+    }
+
+    # manage the systemd service
+    if $manage_service {
+
+      # Use these in notifications or file resources
+      systemd::unit_file { 'postgres_exporter.service':
+        content   => template('exporters/postgres_exporter.service.erb'),
+        enable    => true,
+        active    => true,
+        subscribe => Package['postgres_exporter'],
+      }
+    }
+
+    # manage consul service
+    consul::service { 'postgres_exporter':
+      service_name => 'postgres_exporter',
+      address      => $facts['networking']['ip'],
+      port         => $port,
+      tags         => [
+        'metrics',
+        'metrics_scheme=http',
+        'metrics_job=postgres',
+      ],
+      checks       => [
+        {
+          id              => 'postgres_exporter_http_check',
+          name            => 'postgres_exporter HTTP Check',
+          http            => "http://${facts['networking']['fqdn']}:${port}",
+          method          => 'GET',
+          tls_skip_verify => true,
+          interval        => '10s',
+          timeout         => '1s',
+        },
+      ],
+    }
+  }
+}

modules/exporters/templates/node_exporter.service.erb

@@ -0,0 +1,15 @@
+[Unit]
+Description=Prometheus node_exporter
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=<%= @user %>
+Group=<%= @group %>
+ExecStart=<%= @exec_path %>
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=process
+Restart=always
+
+[Install]
+WantedBy=multi-user.target

modules/exporters/templates/postgres_exporter.service.erb

@@ -0,0 +1,16 @@
+[Unit]
+Description=Prometheus postgres_exporter
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=<%= @user %>
+Group=<%= @group %>
+EnvironmentFile=<%= @vars_file %>
+ExecStart=<%= @exec_path %>
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=process
+Restart=always
+
+[Install]
+WantedBy=multi-user.target

modules/exporters/templates/postgres_exporter_sysconfig.erb

@@ -0,0 +1,4 @@
+# THIS FILE IS MANAGED BY PUPPET
+DATA_SOURCE_URI="<%= @db_host %>:<%= @db_port %>/postgres?sslmode=disable"
+DATA_SOURCE_USER="<%= @db_user %>"
+DATA_SOURCE_PASS="<%= @db_pass %>"