[lxc-users] LXD in OpenStack confusion

[Serge Hallyn]

Quoting Muneeb Ahmad (muneeb.gandapur at gmail.com):
> >
> > 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?

How so?

> 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
> >
> > _______________________________________________
> > lxc-users mailing list
> > lxc-users at lists.linuxcontainers.org
> > http://lists.linuxcontainers.org/listinfo/lxc-users
> >

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