[one-users] ONE 4.8: Some OVS / cgroups / spice questions?

[Jaime Melis]

Hi Jhon,

> 1. Open VSwitch - bridge creation.

TL;DR: you just need one bridge per physical interface. OpenNebula will
manage the vlan tagging automatically.

It works like the 'dummy' network system, not like the 802.1Q. In the dummy
network drivers you typically have one bridge per physical interface, and
simply attach the virtual nic to the bridge, thus enabling connectity
through the physical intertaface.

When VLANs come into play, in 802.1Q we need one bridge per VLAN id, so
OpenNebula creates those bridges. However this is not necessary for the
OpenvSwitch drivers. We just have one bridge (manually created and attached
to the physical interface) and the drivers only need that bridge. When the
VM is instantiated it simply connects the virtual nic to the ovs switch and
then tags each virtual nic, so we don't new bridges.



On Mon, Sep 29, 2014 at 3:08 PM, Jhon Masschelein <
jhon.masschelein at surfsara.nl> wrote:

> Hi,
>
> I am installing a new Opennebula 4.8 cluster.
> (Been running a 3.2 cluster for the last couple of years and finally
> upgrading.)
>
> At this point, I have a split oned+mm_sched / sunstone (nginx+passenger)
> cluster with two hypervisor hosts and I can successfully start VMs, so the
> basic setup is good.
>
> I now have a few questions I hope I can get some pointers on:
>
> 1. Open VSwitch - bridge creation.
> Using the open VSwitch network driver, I cannot add a PHYSDEV. Does this
> mean that I need to create the bridges on the hosts manually?
> Considering that for regular 802.1Q bridges, opennebula does this for me,
> I expected it to be done automatically for OVS too?
> Is there a technical reason why this would not be possible?
>
> 2. cGroups
> I am installing on CentOS7 and the whole cgroup system has been merged
> with systemd.
> I am having troubles matching the cgroup info on the documentation site
> with the new "cgroup in systemd" and was wondering if any prior art already
> exists?
> Is the current implementation of cgroup in opennebula 4.8 supposed to work
> with the systemd setup?
> (I am comfortable working with systemd.)
>
> 3. SPICE client
> How am I supposed to connect to the spice socket? I have a local spice
> client and from the deployment file I can get the port number, but what IP
> should I connect too?
> Is there a ws-proxy like thing to set up? I can't seem to find any info in
> the documentation…
> Or do I need to make the hypervisor hosts available directly on the
> internet? (Not something I am really willing to do.)
>
> Thank you for reading and thanks for any info!
>
> Best regards,
>
>
> Jhon
>
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>



-- 
Jaime Melis
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | jmelis at opennebula.org
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