[Openstack-operators] Murano in Production
smelikyan at mirantis.com
Fri Sep 23 07:21:59 UTC 2016
if I understand correctly we use pacemaker/corosync to manage our
cluster. When primary controller is detected as failed - pacemaker
updates HAProxy configuration to point to the new primary controller.
I don't know all details regarding HA Proxy and how HA is made in that
case, I've added Andrew who might share more details regarding that.
Andrew can you help here?
On Fri, Sep 23, 2016 at 12:11 AM, Kris G. Lindgren
<klindgren at godaddy.com> wrote:
> How are you having ha proxy pointing to the current primary controller? Is this done automatically or are you manually setting a server as the master?
> Sent from my iPad
>> On Sep 23, 2016, at 5:17 AM, Serg Melikyan <smelikyan at mirantis.com> wrote:
>> Hi Joe,
>> I can share some details on how murano is configured as part of the
>> default Mirantis OpenStack configuration and try to explain why it's
>> done in that way as it's done, I hope it helps you in your case.
>> As part of Mirantis OpenStack second instance of the RabbitMQ is
>> getting deployed specially for the murano, but it's configuration is
>> different than for the RabbitMQ instance used by the other OpenStack
>> Why to use separate instance of the RabbitMQ?
>> 1. Prevent possibility to get access to the RabbitMQ supporting
>> whole cloud infrastructure by limiting access on the networking level
>> rather than rely on authentication/authorization
>> 2. Prevent possibility of DDoS by limiting access on the
>> networking level to the infrastructure RabbitMQ
>> Given that second RabbitMQ instance is used only for the murano-agent
>> <-> murano-engine communications and murano-agent is running on the
>> VMs we had to make couple of changes in the deployment of the RabbitMQ
>> (bellow I am referencing RabbitMQ as RabbitMQ instance used by Murano
>> for m-agent <-> m-engine communications):
>> 1. RabbitMQ is not clustered, just separate instance running on each
>> controller node
>> 2. RabbitMQ is exposed on the Public VIP where all OpenStack APIs are exposed
>> 3. It's has different port number than default
>> 4. HAProxy is used, RabbitMQ is hidden behind it and HAProxy is always
>> pointing to the RabbitMQ on the current primary controller
>> Note: How murano-agent is working? Murano-engine creates queue with
>> uniq name and put configuration tasks to that queue which are later
>> getting picked up by murano-agent when VM is booted and murano-agent
>> is configured to use created queue through cloud-init.
>> #1 Clustering
>> * Given that per 1 app deployment from we create 1-N VMs and send 1-M
>> configuration tasks, where in most of the cases N and M are less than
>> * Even if app deployment will be failed due to cluster failover it's
>> can be always re-deployed by the user.
>> * Controller-node failover most probably will lead to limited
>> accessibility of the Heat, Nova & Neutron API and application
>> deployment will fail regardless of the not executing configuration
>> task on the VM.
>> #2 Exposure on the Public VIP
>> One of the reasons behind choosing RabbitMQ as transport for
>> murano-agent communications was connectivity from the VM - it's much
>> easier to implement connectivity *from* the VM than *to* VM.
>> But even in the case when you are connecting to the broker from the VM
>> you should have connectivity and public interface where all other
>> OpenStack APIs are exposed is most natural way to do that.
>> #3 Different from the default port number
>> Just to avoid confusion from the RabbitMQ used for the infrastructure,
>> even given that they are on the different networks.
>> #4 HAProxy
>> In case of the default Mirantis OpenStack configuration is used mostly
>> to support non-clustered RabbitMQ setup and exposure on the Public
>> VIP, but also helpful in case of more complicated setups.
>> P.S. I hope my answers helped, let me know if I can cover something in
>> more details.
>> Serg Melikyan, Development Manager at Mirantis, Inc.
>> http://mirantis.com | smelikyan at mirantis.com
>> OpenStack-operators mailing list
>> OpenStack-operators at lists.openstack.org
Serg Melikyan, Development Manager at Mirantis, Inc.
http://mirantis.com | smelikyan at mirantis.com
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