Configuring High Availability

TripleO supports high availability of the controller services using Pacemaker. To enable this feature, you need at least three controller nodes, enable Pacemaker as the resource manager and specify an NTP server.

Create the following environment file:

$ cat ~/environment.yaml
  ControllerCount: 3

And add the following arguments to your openstack overcloud deploy command to deploy with HA:

-e environment.yaml -e /usr/share/openstack-tripleo-heat-templates/environments/docker-ha.yaml --ntp-server