I want to summary for who meets problems with Openstack when deploy cluster with 3 controller using Kolla Ansible

Scenario: 1 of 3 controller is down

1. Login horizon and use API such as nova, cinder will be very slow

fix by:

nano:
kolla-ansible/ansible/roles/heat/templates/heat.conf.j2
kolla-ansible/ansible/roles/nova/templates/nova.conf.j2
kolla-ansible/ansible/roles/keystone/templates/keystone.conf.j2
kolla-ansible/ansible/roles/neutron/templates/neutron.conf.j2

kolla-ansible/ansible/roles/cinder/templates/cinder.conf.j2

or which service need caches
 

add as below

[cache]
backend = oslo_cache.memcache_pool
enabled = True
memcache_servers = {{ kolla_internal_vip_address }}:{{ memcached_port }}
memcache_dead_retry = 0.25
memcache_socket_timeout = 900

but it is not the end

2. Cannot launch instance or mapping block device(stuck at this step)

nano kolla-ansible/ansible/roles/rabbitmq/templates/definitions.json.j2

 
"policies":[
    {"vhost": "/", "name": "ha-all", "pattern": "^(?!(amq\.)|(.*_fanout_)|(reply_)).*", "apply-to": "all", "definition": {"ha-mode":"all"}, "priority":0}{% if project_name == 'outward_rabbitmq' %},
    {"vhost": "{{ murano_agent_rabbitmq_vhost }}", "name": "ha-all", "pattern": ".*", "apply-to": "all", "definition": {"ha-mode":"all"}, "priority":0}
    {% endif %}
  ]

nano /etc/kollla/global.conf

[oslo_messaging_rabbit]
kombu_reconnect_delay=0.5

I used Xena 13.4 and Yoga 14.8.1.

Above bugs are critical, but I see that it was not fixed. I am just an operator and I want to share what I encountered for new people who come to Openstack