On 06/04/16 15:54 +0000, Hongbin Lu wrote:


-----Original Message-----
From: Flavio Percoco [mailto:[email protected]]
Sent: April-06-16 9:14 AM
To: [email protected]
Subject: [openstack-dev] [magnum] Containers lifecycle management


Greetings,

I'm fairly new to Magnum and I hope my comments below are accurate.

After reading some docs, links and other references, I seem to
understand the Magnum team has a debate on whether providing
abstraction for containers lifecycle is something the project should do
or not. There's a patch that attempts to remove PODs and some debates
on whether `container-*` commands are actually useful or not.

FYI, according to the latest decision [1][2], below is what it will be:
* The k8s abstractions (pod/service/replication controller) will be removed. 
Users will need to use native tool (i.e. kubectl) to consume the k8s service.
* The docker swarm abstraction (container) will be moved to a separated driver. 
In particular, there will be two drivers for operators to select. The first 
driver will have minimum functionality (i.e. provision/manage/delete the swarm 
cluster). The second driver will have additional APIs to manage container 
resources in the swarm bay.

[1] https://wiki.openstack.org/wiki/Magnum/NativeAPI
[2] https://etherpad.openstack.org/p/magnum-native-api


Based on the above, I wanted to understand what would be the
recommended way for services willing to consume magnum to run
containers? I've been digging a bit into what would be required for
Trove to consume Magnum and based on the above, it seems the answer is
that it should support either docker, k8s or mesos instead.

- Is the above correct?

I think it is correct. At current stage, Trove needs to select a bay type 
(docker swarm, k8s or mesos). If the use case is to manage a single container, 
it is recommended to choose the docker swarm bay type.

- Is there a way to create a container, transparently, on whatever
backend using
  Magnum's API?

At current stage, it is impossible. There is a blueprint [3] for proposing to 
unify the heterogeneity of different bay types, but we are in disagreement on 
whether Magnum should provide such functionality. You are welcome to contribute 
your use cases if you prefer to have it implemented.

[3] https://blueprints.launchpad.net/magnum/+spec/unified-containers

Thanks for the clarifications Hongbin.

Would it make sense to have the containers abstraction do this for other bays 
too?

Flavio

--
@flaper87
Flavio Percoco

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