[lxc-users] Migrating LXD VMs/containers between nodes

[Dilvan Moreira]

On Wed, Nov 25, 2015 at 3:50 PM, Serge Hallyn <serge.hallyn at ubuntu.com>
wrote:

> Quoting Dilvan Moreira (dilvan at gmail.com):
> >    1.
> >    Is there a way to pass a block volume (Ceph/rbd) or folder to a LXD
> VM,
>
> You can just have your scripts mount the volume/folder to
> /var/lib/lxd/containers/container/rootfs.  You can set
> lxc.rootfs= in the raw.lxc.


   Where this raw.lxc file is located (Can I have one for each VM)? In any
case, that doesn’t solve my problem. I cannot just start a VM from another
machine (as I can do now), I will have to copy the metadata.yam file and
templates folder. Don’t they change over time? Is it safe to copy them just
after the container is created?



>   Or you can wait for
>
> https://github.com/lxc/lxc/pull/670
>
> Once that gets into lxc, I've not thought through whether you'll need
> any specific support from lxd.
>
> I think what you're doing now makes a lot of sense - the only shortcoming
> is that live migration may be complicated because of the shared rootfs.
>
> Note that Guido (cc:d) is also doing a similar setup (using NFS).
>
> >    so LXD itself would mount the root folder (/)? It would be nice to
> have
> >    a block volume for each VM (and not all VMs using the same folder).
> >    2.
> >
> >    Is there a simpler solution than OpenStack for my use case (or a
> simpler
> >    installation procedure for OpenStack)?
>
> imho juju is the simplest way to install openstack.
>

   In all examples I found of juju installing OpenStack (I don’t know much
about juju), it was using a set of VMs or MaaS (Metal as a Service). VMs
would be pointless in my case and MaaS is very complicated to implement
(and not very useful in my case). Can I use juju in real bare metal? If so,
can you point me to some example/documentation?


> >    3.
> >
> >    Ultimately, I would like my cluster to have the ability to schedule
> VMs
> >    to nodes, move VMs from failed nodes, etc. Any suggestions on how to
> get
> >    that?
>
> The biggest complication I see is that when you ask lxd to move a
> container,
> lxd will want to migrate the rootfs.  I'm waiting for clarification from
> Tycho on whether lxd will be smart enough to DTRT.
>

   Using Ceph/rbd, there is no need to migrate anything. I am not aiming to
have live migration, so the plan is to shutdown the container and start it
agin in another node.

Cheers,

Dilvan.

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