From 3edcf9b6705aace9ec98addd8293d1aed5b47c89 Mon Sep 17 00:00:00 2001
From: Swann Croiset <scroiset@mirantis.com>
Date: Thu, 14 Jan 2016 11:51:57 +0100
Subject: [PATCH] Set appropriately the Pacemaker option no-quorum-policy

When the cluster does not have quorum (less than 3 Elasticsearch nodes) the
'no-quorum policiy' is set to 'ignore', which allows to continue all resource
management.
If the cluster have quorum (more that 2 nodes), the policy is set to 'stop',
which stops all resources in the affected cluster partition if the cluster
loses quorum to avoid data corruption.

http://clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/s-cluster-options.html

Change-Id: I3b1ad071e4bf31581f245bbd8de863e6266ffb5b
---
 .../puppet/manifests/enable_quorum.pp         | 34 +++++++++++++++++++
 deployment_tasks.yaml                         | 14 ++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 deployment_scripts/puppet/manifests/enable_quorum.pp

diff --git a/deployment_scripts/puppet/manifests/enable_quorum.pp b/deployment_scripts/puppet/manifests/enable_quorum.pp
new file mode 100644
index 0000000..e8867dd
--- /dev/null
+++ b/deployment_scripts/puppet/manifests/enable_quorum.pp
@@ -0,0 +1,34 @@
+#    Copyright 2016 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.
+#
+
+prepare_network_config(hiera('network_scheme', {}))
+$corosync_roles = hiera_array('lma::corosync_roles')
+$network_metadata = hiera('network_metadata')
+$nodes = get_nodes_hash_by_roles($network_metadata, $corosync_roles)
+
+Cs_property {
+  provider => 'crm',
+}
+
+if count($nodes) > 2 {
+  $policy = 'stop'
+} else {
+  $policy = 'ignore'
+}
+
+cs_property { 'no-quorum-policy':
+  ensure => present,
+  value  => $policy,
+}
diff --git a/deployment_tasks.yaml b/deployment_tasks.yaml
index bb996ad..0ebbcc1 100644
--- a/deployment_tasks.yaml
+++ b/deployment_tasks.yaml
@@ -143,3 +143,17 @@
     timeout: 600
   reexecute_on:
     - deploy_changes
+
+# This task needs to be reexecuted to reconfigure the no-quorum-policy each
+# time the cluster is scaled.
+- id: lma-enable-quorum
+  type: puppet
+  groups: [primary-elasticsearch_kibana]
+  requires: [lma-es-kibana-haproxy]
+  required_for: [deploy_end]
+  parameters:
+    puppet_manifest: "puppet/manifests/enable_quorum.pp"
+    puppet_modules: "puppet/modules"
+    timeout: 120
+  reexecute_on:
+    - deploy_changes