Change the rabbitmq ha policies during an M/N Upgrade

This takes care of the M->N upgrade path when changing
the ha rabbitmq policy.

Partial-Bug: #1628998

Change-Id: I2468a096b5d7042bc801a742a7a85fb1521c1c02

2 files changed, 24 insertions, 1 deletions

diff --git a/extraconfig/tasks/major_upgrade_controller_pacemaker_1.sh b/extraconfig/tasks/major_upgrade_controller_pacemaker_1.sh
index d4200e5f..23074fcb 100755
--- a/extraconfig/tasks/major_upgrade_controller_pacemaker_1.sh
+++ b/extraconfig/tasks/major_upgrade_controller_pacemaker_1.sh
@@ -20,9 +20,13 @@ check_disk_for_mysql_dump
 STONITH_STATE=$(pcs property show stonith-enabled | grep "stonith-enabled" | awk '{ print $2 }')
 pcs property set stonith-enabled=false
 
-# Migrate to HA NG
+# Migrate to HA NG and fix up rabbitmq queues
+# We fix up the rabbitmq ha queues after the migration because it will
+# restart the rabbitmq resource. Doing it after the migration means no other
+# services will be restart as there are no other constraints
 if [[ -n $(is_bootstrap_node) ]]; then
     migrate_full_to_ng_ha
+    rabbitmq_mitaka_newton_upgrade
 fi
 
 # After migrating the cluster to HA-NG the services not under pacemaker's control
diff --git a/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh b/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh
index cd78f838..5b834b2b 100644
--- a/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh
+++ b/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh
@@ -169,3 +169,22 @@ function migrate_full_to_ng_ha {
         fi
     fi
 }
+
+# This function will make sure that the rabbitmq ha policies are converted from mitaka to newton
+# In mitaka we had: Attributes: set_policy="ha-all ^(?!amq\.).* {"ha-mode":"all"}"
+# In newton we want: Attributes: set_policy="ha-all ^(?!amq\.).* {"ha-mode":"exactly","ha-params":2}"
+# The nr "2" should be CEIL(N/2) where N is the number of Controllers (i.e. rabbit instances)
+# Note that changing an attribute like this makes the rabbitmq resource restart
+function rabbitmq_mitaka_newton_upgrade {
+    if pcs resource show rabbitmq-clone | grep -q -E "Attributes:.*\"ha-mode\":\"all\""; then
+        # Number of controller is obtained by counting how many hostnames we
+        # have in controller_node_names hiera key
+        nr_controllers=$(($(hiera controller_node_names | grep -o "," |wc -l) + 1))
+        nr_queues=$(($nr_controllers / 2 + ($nr_controllers % 2)))
+        if ! [ $nr_queues -gt 0 -a $nr_queues -le $nr_controllers ]; then
+            echo_error "ERROR: The nr. of HA queues during the M/N upgrade is out of range $nr_queues"
+            exit 1
+        fi
+        pcs resource update rabbitmq set_policy='ha-all ^(?!amq\\.).* {"ha-mode":"exactly","ha-params":'"$nr_queues}" --wait=600
+    fi
+}