[Rdo-list] RFC: Document Regarding Highly Availability Openstack (Juno) Deployments

[Arash Kaffamanesh]

Hi Andrew,

Thanks for sharing and for the nice hard work, much appreciated!

-- Arash



On Fri, Mar 6, 2015 at 5:34 AM, Andrew Beekhof <abeekhof at redhat.com> wrote:

> I would like to draw people's attention to a new document that hopes to
> capture the process of deploying Openstack for High Availability on CentOS
> / RHEL.
>
> Goals:
>
> - separate discussion (why) from implementation (how)
> - be conducive to copy & paste
> - easily be versioned as a whole
> - clearly distinguishes parts that need to be customised (variables)
> - able to be fed into a tool for automated deployment if needed
>
> This document grew out of an internal Red Hat one that served as input to
> our installer team.
> For this reason you may find some things are still referred to by their
> downstream names (eg. RHEL and OSP6) but except for the yum repositories
> used, everything should apply equally to Juno and CentOS7.
> I expect to clean these up over time and encourage people to point out
> incompatibilities.
>
> You can find the document at:
>
>    https://github.com/beekhof/osp-ha-deploy/blob/master/ha-openstack.md
>
> and an updated wiki entry that summarises the key points and refers to it:
>
>
> https://openstack.redhat.com/RDO_HighlyAvailable_and_LoadBalanced_Control_Services
>
> Please be aware that it is an evolving document, regularly updated in
> response to feedback from the field.
> For example in the last few weeks we have incorporated a new RabbitMQ
> agent and changed cinder-volume to active/passive.
>
> The scripts this document links to can be fed directly to a tool called
> PhD (https://github.com/davidvossel/phd) which is an unofficial side
> project of the cluster team.
> It is by no means expected that anyone should need this tool to understand
> or implement the deployment documented here.
>
> There are some aspects of this setup that I have inherited and for which
> the rationale has been lost to the mists of time.
> If anyone has insight into why things are done in a specific way, or would
> like to provide additional background, please get in touch.
>
> Examples:
> - MongoDB is apparently incompatible with HAProxy.  Does anyone know if
> this is for the same TCP keep-alive issue RabbitMQ has?
> - I'm led to believe there are interesting things to be said on the topic
> of neutron L3 plugins. Would anyone like to kick off?
>
> -- Andrew
>
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