Pacemaker HA suport for OVN DB servers

This patch adds the templates required to enable the OVN DB servers
to be started in master/slave mode in the pacemaker cluster.

For the OVN DBs base profile, ::tripleo::haproxy expects the parameter
'ovn_dbs_manage_lb' set to true in order for it to configure OVN DBs
for load balancing (please see this commit [1]). So this patch sets
'ovn_dbs_manage_lb' to true.

[1] - I9dc366002ef5919339961e5deebbf8aa815c73db

Co-authored-by: Babu Shanmugam (babu.shanmugam@gmail.com)
Depends-on: I94d3960e6c5406e3af309cc8c787ac0a6c9b1756
Change-Id: I60c55abfc523973aa926d8a12ec77f198d885916
Closes-bug: #1670564

environments/neutron-ml2-ovn-ha.yaml

@@ -0,0 +1,24 @@
+# A Heat environment file which can be used to enable OVN
+# extensions, configured via puppet
+resource_registry:
+  OS::TripleO::Services::NeutronCorePlugin: OS::TripleO::Services::NeutronCorePluginML2OVN
+  OS::TripleO::Services::ComputeNeutronCorePlugin: ../puppet/services/neutron-compute-plugin-ovn.yaml
+  OS::TripleO::Services::OVNDBs: ../puppet/services/pacemaker/ovn-dbs.yaml
+# Disabling Neutron services that overlap with OVN
+  OS::TripleO::Services::NeutronL3Agent: OS::Heat::None
+  OS::TripleO::Services::NeutronOvsAgent: OS::Heat::None
+  OS::TripleO::Services::NeutronMetadataAgent: OS::Heat::None
+  OS::TripleO::Services::NeutronDhcpAgent: OS::Heat::None
+  OS::TripleO::Services::ComputeNeutronOvsAgent: OS::Heat::None
+
+parameter_defaults:
+  NeutronMechanismDrivers: ovn
+  OVNVifType: ovs
+  OVNNeutronSyncMode: log
+  OVNQosDriver: ovn-qos
+  OVNTunnelEncapType: geneve
+  NeutronEnableDHCPAgent: false
+  NeutronTypeDrivers: 'geneve,vxlan,vlan,flat'
+  NeutronNetworkType: 'geneve'
+  NeutronServicePlugins: 'qos,ovn-router'
+  NeutronVniRanges: ['1:65536', ]

puppet/services/ovn-dbs.yaml

@@ -44,6 +44,7 @@ outputs:
           ovn::northbound::port: {get_param: OVNNorthboundServerPort}
           ovn::southbound::port: {get_param: OVNSouthboundServerPort}
           ovn::northd::dbs_listen_ip: {get_param: [ServiceNetMap, OvnDbsNetwork]}
+          tripleo::haproxy::ovn_dbs_manage_lb: true
           tripleo.ovn_dbs.firewall_rules:
             '121 OVN DB server ports':
               proto: 'tcp'

puppet/services/pacemaker/ovn-dbs.yaml

@@ -0,0 +1,61 @@
+heat_template_version: ocata
+
+description: >
+  OVN databases configured with puppet in HA mode
+
+parameters:
+  ServiceNetMap:
+    default: {}
+    description: Mapping of service_name -> network name. Typically set
+                 via parameter_defaults in the resource registry.  This
+                 mapping overrides those in ServiceNetMapDefaults.
+    type: json
+  DefaultPasswords:
+    default: {}
+    type: json
+  RoleName:
+    default: ''
+    description: Role name on which the service is applied
+    type: string
+  RoleParameters:
+    default: {}
+    description: Parameters specific to the role
+    type: json
+  EndpointMap:
+    default: {}
+    description: Mapping of service endpoint -> protocol. Typically set
+                 via parameter_defaults in the resource registry.
+    type: json
+  OVNNorthboundServerPort:
+    description: Port of the OVN Northbound DB server
+    type: number
+    default: 6641
+  OVNSouthboundServerPort:
+    description: Port of the OVN Southbound DB server
+    type: number
+    default: 6642
+
+resources:
+
+  OVNDBsBase:
+    type: ../ovn-dbs.yaml
+    properties:
+      ServiceNetMap: {get_param: ServiceNetMap}
+      DefaultPasswords: {get_param: DefaultPasswords}
+      EndpointMap: {get_param: EndpointMap}
+      RoleName: {get_param: RoleName}
+      RoleParameters: {get_param: RoleParameters}
+
+outputs:
+  role_data:
+    description: Role data for the OVN northd service
+    value:
+      service_name: ovn_dbs
+      config_settings:
+        map_merge:
+          - get_attr: [OVNDBsBase, role_data, config_settings]
+          - tripleo::haproxy::ovn_dbs_manage_lb: false
+            tripleo::profile::pacemaker::ovn_northd::nb_db_port: {get_param: OVNNorthboundServerPort}
+            tripleo::profile::pacemaker::ovn_northd::sb_db_port: {get_param: OVNSouthboundServerPort}
+      step_config: |
+        include ::tripleo::profile::pacemaker::ovn_northd

releasenotes/notes/ovn-ha-c0139ac519680872.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Support HA for OVN db servers and ovn-northd using Pacemaker.