On Thu, Sep 28, 2017 at 3:03 PM, Michael Burman <mbur...@redhat.com> wrote:

> When you delete the host, all files remain as they were before. Nothing
> changes.
> I have tested this flow today and this is the result:
>
> 1) For example i have host installed with ovirtmgmt as my management and i
> want to change the management network of the cluster or to add to a new
> cluster with different management network.
>
> 2) Follow the steps create another network as the management network(as
> explained in the mail or feature page). Make sure to check the 'default
> route' property as well! and make ovirtmgmt as non-required network as well.
>
> 3) Remove the host - no need to remove any files or packages
>
> 4) Add the host to the new cluster with the new management network.
>
> 5) What will happen is that engine will fail to configure the new
> management network on the host(and become non-operational), but it is
> easily can be work around by going to the setup networks dialog and switch
> between the networks, by detaching ovirtmgmt and attaching the new
> management network. After pressing OK the new management network will be
> saved on the host and the new network configuration will be applied on the
> host.
>
> 6) After this step host still remain as non-operational, all we need to do
> now is to 'Activate' the host  and host become operational once again with
> the new network changes will take place. All files will be update
> successfully on the host.
>
> - So it looks like we not handling such scenario smoothly and maybe this
> should be fixed.
> If we had a host running with 1 management network and we want to add this
> host to a different cluster with a different management network engine and
> vdsm should be able to take care of it during the installation of the host
> and to successfully make all the required changes.
>
> Dan , Alona what do you think? should we handle such use case? or this is
> expected?
>

Pert Horacek recently wrote a vdsm-tool to remove networks from a host that
is no longer used by oVirt.
https://gerrit.ovirt.org/#/c/79495/ - link to Petr's code.

It will be officially available on 4.2.


>
>
>
>
>
> On Wed, Sep 27, 2017 at 7:24 PM, Gianluca Cecchi <
> gianluca.cec...@gmail.com> wrote:
>
>>
>>
>> On Wed, Sep 27, 2017 at 4:32 PM, Michael Burman <mbur...@redhat.com>
>> wrote:
>>
>>> I was referring to situation in which the host was there before, but you
>>> need to re-install it to the new cluster with the new management network.
>>>
>>> No package removing is needed at all. Why would you do steps 2-4? no
>>> need.
>>> Step 5 should work.
>>>
>>> I'm not sure i understand what you mean by ' still I cannot remove the
>>> default ovirtmgmt network from that cluster'??
>>> Do you want to detach it from the cluster?
>>> Do you want to remove it from the DC?
>>> Note that you can change the management network role only if the cluster
>>> has no hosts in it.
>>>
>>>
>>>
>> I will try this way.
>> Normally in my setups the ip on the mgmt network of the host is also the
>> ip corresponding to its hostname
>> When I delete a host from engine, what happens in relation to its network
>> files in /etc/sysconfig/network-scripts/ directory and the contents of
>> /var/lib/vdsm/ directory and its subdirectories?
>>
>>
>
>
>
> --
>
> Michael Burman
>
> Quality engineer - rhv network - redhat israel
>
> Red Hat
>
> <https://www.redhat.com>
>
> mbur...@redhat.com    M: 0545355725     IM: mburman
> <https://red.ht/sig>
>
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