Fail early when the settings aren't valid

This change adds a post-deployment task that verifies that the plugin
configuration matches with the configuration of the environment.

The checks are:

  - The plugin is deployed on a bare base-os node.
  - The disk configuration is valid.
  - The JVM size doesn't exceed the physical RAM.

Change-Id: I6155fbad46502b9cd23a2fa54f3137441da8a270

deployment_scripts/puppet/manifests/check_environment_configuration.pp

@@ -0,0 +1,45 @@
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+$elasticsearch_kibana = hiera('elasticsearch_kibana')
+
+if $elasticsearch_kibana['node_name'] == hiera('user_node_name') {
+  $roles = hiera('roles')
+  $blockdevices_array = split($::blockdevices, ',')
+
+  # Check that we're not colocated with other roles
+  if size($roles) > 1 {
+    fail('The Elasticsearch-Kibana plugin cannot be deployed with roles other than base-os.')
+  }
+
+  # Check that disk device(s) exist
+  if ($elasticsearch_kibana['disk1']) and !($elasticsearch_kibana['disk1'] in $blockdevices_array) {
+    fail("Disk device ${ elasticsearch_kibana['disk1'] } doesn't exist.")
+  }
+
+  if ($elasticsearch_kibana['disk2']) and !($elasticsearch_kibana['disk2'] in $blockdevices_array) {
+    fail("Disk device ${ elasticsearch_kibana['disk2'] } doesn't exist.")
+  }
+
+  if ($elasticsearch_kibana['disk3']) and !($elasticsearch_kibana['disk3'] in $blockdevices_array) {
+    fail("Disk device ${ elasticsearch_kibana['disk3'] } doesn't exist.")
+  }
+
+  # Check that JVM size doesn't exceed the physical RAM size
+  $jvmsize_mb = ($elasticsearch_kibana['jvm_heap_size'] + 0.0) * 1024
+  if $jvmsize_mb >= $::memorysize_mb {
+    fail("The configured JVM size (${ $elasticsearch_kibana['jvm_heap_size'] } GB) is greater than the total amount of RAM of the system (${ ::memorysize }).")
+  }
+}
+

tasks.yaml

@@ -1,3 +1,11 @@
+- role: ['base-os']
+  stage: post_deployment
+  type: puppet
+  parameters:
+    puppet_manifest: puppet/manifests/check_environment_configuration.pp
+    puppet_modules: puppet/modules
+    timeout: 300
+
 - role: ['base-os']
   stage: post_deployment
   type: puppet