[CentOS-virt] Upgrade of CentOS and libvirt: need help on configuring network

Or my old KVM notes,for setting up the networking for TUSK software, at
https://wikis.uit.tufts.edu/confluence/display/TUSKpub/Install+KVM+Hypervisor+For+TUSK.
Libvirt, NetworkManager, and the system-config-network tools of RHEL and
thus of CentOS have no configuration tools that handle pair bonding, and
the published directions for pair bonding and bridging needed.... a lot of
work, which is why I wrote those.


On Mon, Sep 23, 2013 at 10:52 AM, Stefano Stabellini <
stefano.stabellini at eu.citrix.com> wrote:

> On Mon, 23 Sep 2013, Schut, Koos J J (Koos) wrote:
> > I upgraded from CentOS 5.9 to CentOS 6.4.
> >
> > I try to reuse my virtual machines and am only partially successful: I
> can run them, I just cannot get the network OK and need
> > some help with that.
> >
> >
> >
> > What I had in the past was pretty simple: both the host and the VM’s
> used eth0 and each had an IP in the same subnet and could
> > communicate freely. With the new install it seems somewhat more complex
> and I think I need to configure a bridge and use that.
> > Unfortunately, info I find through google is overwhelming and confusing.
> All examples either configure something else, or the
> > outcome is not what  expected.
> >
> >
> >
> > So: how to go about setting things up to have say:
> >
> > My physical machine is on 192.168.0.90
> >
> > My Virtual machines are on 192.168.0.100 and 101.
> >
> > These are to be fixed addresses.
> >
> > The 2 VM’s have to communicate with each other and with the physical
> machine.
> >
> > The VM’s do not necessarily need to communicate with the rest of the
> world.
> >
> > The physical machine needs to communicate with the rest of the world.
> >
> >
> >
> > I use:
> >
> > - CentOS-6.4_64
> >
> > - Virtual Machine Manager 0.9.0
> >
> > - xen 4.2.3
> >
> > - libvirt 0.10.2.7-5
> >
> > - VM’s show Hypervisor = xen (fullvirt)
> >
> > - Emulator = qemu-dm
> >
> > - NIC points to Shared device name virbr0
> >
> > - on the host, virbr0 has IQ 192.168.122.1
> >
> >
> >
> > I have been fighting this for 2 weeks, now. I tried to follow several
> advises which resulted in either the VM’s not connecting
> > to anything, or my host losing its connection to the rest of the world,
> or both. So either I still do something not-right, or I
> > follow the wrong gidelines.
> >
> >
> >
> > Can someone give me a push in the right direction, please?
>
> Did you try to follow:
>
> http://wiki.xen.org/wiki/Host_Configuration/Networking
>
> ?
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>
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