[CentOS-virt] Upgrading Xen 3 on SL 5 server with CentOS 5 and SL 5

[Pasi Kärkkäinen]

On Fri, Feb 20, 2015 at 09:56:46AM -0500, Nico Kadel-Garcia wrote:
>    I'm dealing with an old Xen 3 server, and badly need to update it and all
>    the vm's on it to more contemporary operating systems.  So far, so good!
>    Can the Xen server on CentOS 5 para-virtualized CentOS 6?
>

Yes, CentOS 5 Xen host can run CentOS 6 PV domUs. Or CentOS 6 HVM guests.


>    And if not, I'm having real trouble getting a live cd or installation media to boot in
>    full virtualization to do the update of the guests.
>    I'd normally start by updating the Xen server first, but that's not
>    workable right now.
>

Yeah CentOS 6 runs as Xen HVM (fully virtualized) aswell. With or without PV drivers (PVHVM).

-- Pasi

 
>    Nico Kadel-Garcia
>    Email: n[1]kadel at gmail.com
>    Sent from iPhone
>    On Feb 18, 2015, at 11:59, SilverTip257 <[2]silvertip257 at gmail.com> wrote:
> 
>      On Wed, Feb 18, 2015 at 3:10 AM, C. L. Martinez
>      <[3]carlopmart at gmail.com> wrote:
> 
>        On Tue, Feb 17, 2015 at 1:43 PM, Sven Kieske <[4]s.kieske at mittwald.de>
>        wrote:
>        >
>        >
>        > On 17/02/15 09:18, C. L. Martinez wrote:
>        >> Hi all,
>        >>
>        >> How can I stop/disable a nic in a virtual guest using a virsh
>        >> command?? I am searching the same effect like if I unplug network
>        >> cable ... Is it possible?? I have tried with "detach-interface"
>        >> command without luck. I don't want to remove the nic from guest
>        >> configuration, only to stop the nic ...
>        >
>        > Depending on your network architecture you could just ifdown
>        > the vmnet, but this just works if you don't have multiple
>        > vms on one vmnet (which you shouldn't).
>        >
>        > HTH
>        >
>        > --
> 
>        Ok, to do a ifdown of virtual bridge it seems the only option.
> 
>        Many thanks to all for your answers.
> 
>      * Definitely look to Juerg Haefliger's solution.  It's exactly what you
>      want since you requested a method that can be done from the virsh
>      interface.  Thanks Juerg!
>      1) down the vnetX interface from the host node
>        ip link show dev vnetX
>        ip link set down vnetX
>        ip link show dev vnetX
>      And if using bridged networking, you have one more option.
>      2) remove the vnetX interface from the bridge
>        brctl delif <bridge_int> vnetX
>      Certainly downing the interface using either Juerg's solution via virsh
>      or mine via iproute2 tools is most ideal since it's easier/simpler to
>      reinstate.  You can use ifconfig if you prefer it over ip tools, but
>      enjoy those tools and syntax while it remains! [0]  ;-)
>      [0] [5]https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/
>      --
>      ---~~.~~---
>      Mike
>      //  SilverTip257  //
> 
>      _______________________________________________
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> 
> References
> 
>    Visible links
>    1. mailto:kadel at gmail.com
>    2. mailto:silvertip257 at gmail.com
>    3. mailto:carlopmart at gmail.com
>    4. mailto:s.kieske at mittwald.de
>    5. https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/
>    6. mailto:CentOS-virt at centos.org
>    7. http://lists.centos.org/mailman/listinfo/centos-virt

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