[Users] Unbundle bond0 which virtmgmt is attached

[Assaf Muller]

There's two checkboxes in the setup networks dialog:

1) save network configuration - This only means that if the change was successful, persist the final networking state
   so that when the host is rebooted, it is booted into the network state *after* the (successful) networking change
2) check connctivity - After the network operation, verify that the engine still has connectivity to the host. If so,
   commit the change. Otherwise roll it back.

The "save network configuration" check box shouldn't change the outcome of the result.


Assaf Muller, Cloud Networking Engineer 
Red Hat 

----- Original Message -----
From: "William Kwan" <potatok at yahoo.com>
To: "Dan Kenigsberg" <danken at redhat.com>
Cc: users at ovirt.org
Sent: Sunday, January 19, 2014 4:49:15 PM
Subject: Re: [Users] Unbundle bond0 which virtmgmt is attached

Thanks a lot! It is a good pointer, it is working. 

I'm not sure this is a dumb error from a new user. When I change the network configuration on the first system, I checked the "save network configuration". It didnt' work and dropped the connection to the system. 

1. I had both systems in maintenance mode 
2. from "hosts", picked one of the system, "setup host networks" 
3. Right clicked on eth1, "Remove eth0 from Bond" 
4. at this point, ovirtmgmt was on the right hand side listed as "Unassigned Logical networks" 
5. I dragged it back to assign it to eth0 
6. checked save network configuration 
6. clicked OK and connection is dropped 

Odd... ON the console, I saw the followings 
bonding: unable to remove non-existent slave eth0 for bond bond0. 
bonding: unable to remove non-existent slave eth1 for bond bond0. 

`/etc/init.d/network restart` and I got bond0 back. I redo the whole process without "save network configuration" and it worked fine. I did this on the 2nd system and it worked fine also. 


Will 





On Saturday, January 18, 2014 7:56 PM, Dan Kenigsberg <danken at redhat.com> wrote: 
On Sat, Jan 18, 2014 at 03:17:22PM -0800, William Kwan wrote: 

> Hi, 
> 
> FAQ type of question. 
> 
> If virtmgmt is assigned to bond0, which is composed of eth0 and eth1, what is the best way to "unbundle" eth1 from bond0? 


I'd say: 
- Move the host to maintanence, so it runs no VMs and does not play SPM 
role. 
- Use the Setup Network dialog to brake the bond and define ovirtmgmt 
directly on top of eth0. The Engine/Vdsm connection should survive 
this kind of change (unlike a change of management address or vlan). 

If the host uses a special storage domain, or is not SPM, you could even 
do that while VMs are running. 





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