[openstack-dev] [tripleo] prototype with standalone mode and remote edge compute nodes

Bogdan Dobrelya bdobreli at redhat.com
Fri Jul 20 06:18:54 UTC 2018

On 7/20/18 2:13 AM, Ben Nemec wrote:
> On 07/19/2018 03:37 PM, Emilien Macchi wrote:
>> Today I played a little bit with Standalone deployment [1] to deploy a 
>> single OpenStack cloud without the need of an undercloud and overcloud.
>> The use-case I am testing is the following:
>> "As an operator, I want to deploy a single node OpenStack, that I can 
>> extend with remote compute nodes on the edge when needed."
>> We still have a bunch of things to figure out so it works out of the 
>> box, but so far I was able to build something that worked, and I found 
>> useful to share it early to gather some feedback:
>> https://gitlab.com/emacchi/tripleo-standalone-edge
>> Keep in mind this is a proof of concept, based on upstream 
>> documentation and re-using 100% what is in TripleO today. The only 
>> thing I'm doing is to change the environment and the roles for the 
>> remote compute node.
>> I plan to work on cleaning the manual steps that I had to do to make 
>> it working, like hardcoding some hiera parameters and figure out how 
>> to override ServiceNetmap.
>> Anyway, feel free to test / ask questions / provide feedback.
> What is the benefit of doing this over just using deployed server to 
> install a remote server from the central management system?  You need to 
> have connectivity back to the central location anyway.  Won't this 
> become unwieldy with a large number of edge nodes?  I thought we told 
> people not to use Packstack for multi-node deployments for exactly that 
> reason.
> I guess my concern is that eliminating the undercloud makes sense for 
> single-node PoC's and development work, but for what sounds like a 
> production workload I feel like you're cutting off your nose to spite 
> your face.  In the interest of saving one VM's worth of resources, now 
> all of your day 2 operations have no built-in orchestration.  Every time 
> you want to change a configuration it's "copy new script to system, ssh 
> to system, run script, repeat for all systems.  So maybe this is a 
> backdoor way to make Ansible our API? ;-)

Ansible may orchestrate that for day 2. Deploying Heat stacks is already 
made ephemeral for standalone/underclouds so only thing you'll need for 
day 2 is ansible really. Hence, the need of undercloud shrinks into 
having an ansible control node, like your laptop, to control all clouds 
via inventory.

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Best regards,
Bogdan Dobrelya,
Irc #bogdando

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