[lxc-users] LXD in OpenStack confusion

[Muneeb Ahmad]

>
> The "flavor" idea is a nova artifact, and nova-lxd forwards that over to
> LXD via profiles. When nova-lxd creates a container instance, it assigns a
> profile to it with the resource constraints of the nova flavor. You can see
> this in lxd with `lxc profile list` and `lxc profile show

So containers will have resource limitation too just like VMs. Doesn't this
make containers less resource efficient as it used to be originally?



On Fri, Apr 29, 2016 at 8:17 PM, Paul Hummer <paul.hummer at canonical.com>
wrote:

> Hi Muneeb-
>
> On Fri, Apr 29, 2016 at 7:29 AM, Muneeb Ahmad <muneeb.gandapur at gmail.com>
> wrote:
>>
>> First I'm confused about how flavors in OpenStack work when we are
>> dealing with LXC containers. Because one of the ideas behind containers is
>> that they can use as much resources as they want unless there's a
>> limitation. So I'm confused when we have to choose a flavor for any
>> instance, is it really going to limit the resources used by that
>> container-instance? And let's say my compute node has 1gb RAM and I use a
>> flavor that has 256mb RAM allocation, I can only launch 3 containers, after
>> that I get 'no valid hosts found' error although in reality I can run much
>> more containers than that. How all this work in containers environment?
>>
>
> The "flavor" idea is a nova artifact, and nova-lxd forwards that over to
> LXD via profiles. When nova-lxd creates a container instance, it assigns a
> profile to it with the resource constraints of the nova flavor. You can see
> this in lxd with `lxc profile list` and `lxc profile show`
>
>
>> Another question I have is that when we run a container on OpenStack, it
>> automatically copy an image into local lxc image list. Even if all the
>> containers are using the same image, it just keeps on adding the image to
>> it's list with a different name. Isn't this a waste of memory?
>>
>
> This is a bug that I have discovered recently. I filed a bug right before
> I read this email. :) https://github.com/lxc/nova-lxd/issues/124
>
> Cheers,
> Paul
>
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