Open Stack

Hi Hieu,

I replied inline.

Best regards,
Hongbin

> -----Original Message-----
> From: Hieu LE [mailto:hieulq19 at gmail.com]
> Sent: June-19-16 9:17 AM
> To: openstack-operators at lists.openstack.org
> Cc: Hongbin Lu
> Subject: [Magnum] Container on bare metal or container on VM
> 
> Hi folks,
> CC Hongbin Lu - PTL of Magnum and Zun.
> 
> (sorry for cross-posting because of sending to wrong ML)
> 
> I am very interested in container-related projects in OpenStack
> ecosystems, especially Magnum and Kolla and I also have a plan to
> deploy Magnum in my lab for HPC researching purposes. But I have some
> questions regarding of deployment model of Magnum:
> 1. What is the pros/cons of deployment containers on VMs comparing with
> containers on bare metal? I have seen RackSpace providing their
> container service on bare metal and some other providers, but Amazon
> use container on VM instead.
> The only problem I saw with container on VM is only about management of
> quota and resources. Deploying containers on VM will lead us to think
> about whether we need to provide more containers on x VM for user or we
> need to provide x+1 VMs for user to scale based on their needs. There
> are 2 layers for operators to manage: 1st is VMs quota/resources and
> 2nd is containers.
[Hongbin Lu] Agree with you that containers on VMs are more complex to manage. There are other cons as well. For example, networking and storage are harder to setup. It is slower to scale up (because the speed to spin up VMs is not as fast as spinning up containers). In comparison, there are several pros. First, running containers on VMs provide strong isolation between containers of different tenants. Second, it can reuse the same resource pool to run VMs and containers (instead of creating a dedicated resource pool for running containers).

> 2. Currently Magnum is on her way to implement the integration with
> Ironic but I can not see the clearer way to keep track about this
> feature (I have read the etherpad of Magnum team after summit). My team
> really want to contribute in this feature but we need something clearer
> to make a decision. Can you provide us some specs or related bp?
[Hongbin Lu] Here is the BP: https://blueprints.launchpad.net/magnum/+spec/magnum-baremetal-full-support . Currently, we have the Heat templates to provision k8s on top of Ironic instances. The next step is to introduce an ironic bay to deliver the full support. Spyros (the BP owner) will report the latest status every weeks in the Magnum team meeting, so you can keep track of the status there. I encourage you to contact Spyros if you want to contribute in this feature. I believe Spyros will coordinate the efforts.

> 
> Thanks,
> Hieu LE.
> 
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