Upgrading Xen 3 on SL 5 server with CentOS 5 and SL 5

Nico Kadel-Garcia <nkadel@xxxxxxxxx> · Fri, 20 Feb 2015 09:56:46 -0500

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? 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.

Nico Kadel-GarciaEmail: nkadel@xxxxxxxxxSent from iPhone

On Feb 18, 2015, at 11:59, SilverTip257 <silvertip257@xxxxxxxxx> wrote:

On Wed, Feb 18, 2015 at 3:10 AM, C. L. Martinez <carlopmart@xxxxxxxxx> wrote:
On Tue, Feb 17, 2015 at 1:43 PM, Sven Kieske <s.kieske@xxxxxxxxxxx> 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] https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/

-- 
---~~.~~---
Mike
//  SilverTip257  //

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