heat unable to communicate with ampq rabbit server

[Mohit]

Environment -:
--------------
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.3 LTS"

$ grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/*
---snip
/etc/apt/sources.list.d/cloudarchive-ocata.list:deb http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/ocata main
/etc/apt/sources.list.d/cloudarchive-ocata.list:# deb-src http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/ocata main

$ heat --version
1.8.0

$ pip freeze|grep heat
heat==8.0.2
heat-cfntools==1.2.7
python-heatclient==1.8.0

$ dpkg -l |grep rabbit
ii rabbitmq-server 3.5.7-1ubuntu0.16.04.2 all AMQP server written in Erlang

Steps to reproduce -:
----------------------
1.Install heat packages following octa installation guide for ubuntu
2. execute openstack stack list
3. Getting error message
ERROR: Exchange.declare: (406) PRECONDITION_FAILED - inequivalent arg 'durable' for exchange 'openstack' in vhost '/openstack': received 'false' but current is 'true'

4. On rabbitmq logs
=ERROR REPORT==== 26-Sep-2017::16:20:11 ===
Channel error on connection <0.31698.5> (192.168.179.133:54012 -> 192.168.179.133:5672, vhost: '/openstack', user: 'openstack'), channel 1:
{amqp_error,precondition_failed,
            "inequivalent arg 'durable' for exchange 'openstack' in vhost '/openstack': received 'false' but current is 'true'",
            'exchange.declare'}

Workaround -:
-------------
1. Update heat.conf default section with rabbit_durable_queues = true
2. Restart the heat services

Expectations -:
----------------
The documentation page https://docs.openstack.org/project-install-guide/orchestration/ocata/install-ubuntu.html

should have listed out to set the param rabbit_durable_queues = true

Do see if you can reproduce this issue further.

[Shi Yan (yanshi-403)]

Hi, Mohit

I think this may be related to rabbit implementation.
The "durable" status is actually decided when the exchange/queue is set up.

So if you delete the heat used exchange or queue in rabbitmq server, the mq connection will be established again. That should be working fine.