Make ::tripleo::profile::base classes work with multiple nodes

In the Next Generation HA architecture a number of active/active services
will be run via systemd. In order for this to work we need to make sure that
the sync_db operation only takes place on the bootstrap node, just like it is
done today for the pacemaker profiles.

We do this by removing sync_db as a parameter and instead set it to true
or false depending if the hostname matches the bootstrap_node as it is done
today in the pacemaker role.

Note that we call hiera('bootstrap_nodeid', undef) because if a profile
is included on a non controller node that variable will be undefined.

The following testing was done:
- HA puppet-pacemaker.yaml scenario with three computes
- NonHA with one controller
- NonHA with three controllers

Fixes-Bug: 1600149

Co-Author: cmsj@tenshu.net

Change-Id: I04a7b9e3c18627ea512000a34357acb7f27d6e0e
Implements: blueprint ha-lightweight-architecture

1 files changed, 12 insertions, 6 deletions

diff --git a/manifests/profile/base/sahara/engine.pp b/manifests/profile/base/sahara/engine.pp
index 8fa1f5f..f792a96 100644
--- a/manifests/profile/base/sahara/engine.pp
+++ b/manifests/profile/base/sahara/engine.pp
@@ -18,19 +18,25 @@
 #
 # === Parameters
 #
-# [*sync_db*]
-#   (Optional) Whether to run db sync
-#   Defaults to true
+# [*bootstrap_node*]
+#   (Optional) The hostname of the node responsible for bootstrapping tasks
+#   Defaults to hiera('bootstrap_nodeid')
 #
 # [*step*]
 #   (Optional) The current step in deployment. See tripleo-heat-templates
 #   for more details.
 #   Defaults to hiera('step')
-#
+
 class tripleo::profile::base::sahara::engine (
-  $sync_db = true,
-  $step    = hiera('step'),
+  $bootstrap_node = hiera('bootstrap_nodeid', undef),
+  $step           = hiera('step'),
 ) {
+  if $::hostname == downcase($bootstrap_node) {
+    $sync_db = true
+  } else {
+    $sync_db = false
+  }
+
   if $step >= 3 and $sync_db {
     include ::sahara::db::mysql
   }