Clustercheck, monitor service for galera containers

In HA overcloud deployments, HAProxy makes use of a helper service
called "clustercheck", to check whether galera nodes are available for
serving traffic.

This change implements a dedicated profile for clustercheck, which was
originally part of the pacemaker mysql profile. The profile generates
the necessary configuration files for clustercheck and let heat
templates manage the associated container's lifecycle.

Co-Authored-By: Michele Baldessari <michele@acksyn.org>
Partial-Bug: #1692969
Change-Id: I1aabe34fa6a9c8c705a4405f275b66502c313cf2

1 files changed, 65 insertions, 0 deletions

diff --git a/manifests/profile/pacemaker/clustercheck.pp b/manifests/profile/pacemaker/clustercheck.pp
new file mode 100644
index 0000000..fad30da
--- /dev/null
+++ b/manifests/profile/pacemaker/clustercheck.pp
@@ -0,0 +1,65 @@
+# Copyright 2016 Red Hat, 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.
+#
+# == Class: tripleo::profile::pacemaker::clustercheck
+#
+# Clustercheck, galera health check profile for tripleo
+#
+# === Parameters
+# [*step*]
+#   (Optional) The current step in deployment. See tripleo-heat-templates
+#   for more details.
+#   Defaults to hiera('step')
+#
+# [*bind_address*]
+#   (Optional) The address that the local mysql instance should bind to.
+#   Defaults to hiera('mysql_bind_host')
+#
+# [*clustercheck_password*]
+#   (Optional) The password for the clustercheck user.
+#   Defaults to hiera('mysql::server::root_password')
+#
+#
+class tripleo::profile::pacemaker::clustercheck (
+  $step                  = hiera('step'),
+  $clustercheck_password = hiera('mysql::server::root_password'),
+  $bind_address          = hiera('mysql_bind_host'),
+) {
+
+  if $step >= 1 {
+    file { '/etc/sysconfig/clustercheck' :
+      ensure  => file,
+      mode    => '0600',
+      owner   => 'mysql',
+      group   => 'mysql',
+      content => "MYSQL_USERNAME=root\n
+MYSQL_PASSWORD='${clustercheck_password}'\n
+MYSQL_HOST=localhost\n",
+    }
+
+    # the clustercheck service is run via xinet in the container
+    xinetd::service { 'galera-monitor' :
+      bind           => $bind_address,
+      port           => '9200',
+      server         => '/usr/bin/clustercheck',
+      per_source     => 'UNLIMITED',
+      log_on_success => '',
+      log_on_failure => 'HOST',
+      flags          => 'REUSE',
+      service_type   => 'UNLISTED',
+      user           => 'mysql',
+      group          => 'mysql',
+    }
+  }
+}