[ovirt-users] Suggestions on changing hosts' network

[Edward Haas]

On Mon, Jan 8, 2018 at 1:57 PM, Edward Haas <ehaas at redhat.com> wrote:

>
>
> On Mon, Jan 8, 2018 at 1:19 AM, Gianluca Cecchi <gianluca.cecchi at gmail.com
> > wrote:
>
>>
>>
>> On Wed, Jan 3, 2018 at 12:25 PM, Gianluca Cecchi <
>> gianluca.cecchi at gmail.com> wrote:
>>
>>>
>>>
>>> On Wed, Jan 3, 2018 at 11:56 AM, Marcin Mirecki <mmirecki at redhat.com>
>>> wrote:
>>>
>>>> Hello Gianluca,
>>>>
>>>> Add/remove would probably be the simplest way to go.
>>>> The procedure would be:
>>>> - take host to maintenance
>>>> - remove host
>>>> - use vdsm-cient to change the ip of ovirtmgmt
>>>> - add the host again
>>>>
>>>> Just changing the dns configuration sounds quite interesting.
>>>> I suppose the host certificates should be ok if the host was added by
>>>> hostname.
>>>>
>>>>
>>> I've already done something similar in September; see here the full
>>> thread:
>>> http://lists.ovirt.org/pipermail/users/2017-September/084411.html
>>>
>>> In that case it was more complicated in the sense that vlan change was
>>> involved for ovirtmgmt and I passed through a new cluster.
>>> Now it is more simple, but while on September case the hosts were plain
>>> CentOS hosts, now they are ovirt-node-ng, so my manual ifcfg files
>>> manipulation doesn't fit.
>>>
>>> If vdsm-client command is ok I presume it will be something of type:
>>>
>>> # vdsm-client Host setupNetworks
>>> vdsm-client: Command Host.setupNetworks with args {} failed:
>>> (code=-32603, message=Attempt to call function: <bound method
>>> Global.setupNetworks of <API.Global object at 0x2279f10>> with arguments:
>>> () error: setupNetworks() takes exactly 4 arguments (1 given))
>>> #
>>>
>>> with some sort of json configuration, but it is not clear to me what to
>>> give
>>>
>>> Can I do the change of ip from the host web cockpit mgmt interface? I
>>> set/change the ip and then eventually reboot the server to see if it works?
>>>
>>> Gianluca
>>>
>>
>>
>> hello,
>> any update on how to give JSON representation (or other way) to use
>> vdsm-client and change ip/gateway of ovirt-ng node?
>> Thanks
>>
>
> How to use vdsm-client in general: Just check its man page.
> You will need to fill up the existing management network details in the
> json format, replacing just the IP address.
> The main concern here is, that if you missed something, it may be removed.
> You should follow https://access.redhat.com/solutions/168983 for full
> details.
>
> I would suggest using a different approach, although I have not tested it
> myself:
> Edit the persisted relevant configuration files: /var/lib/vdsm/persistence/
> netconf
> (Change the IP there, without touching the other stuff)
> Then, reboot the host.. It should identify that the existing config is not
> in sync with the persisted one and a reconfig will be issued automatically.
> The risk here is that the config will not successfully get applied, so
> make sure you save the previous version.
>
> Thanks,
> Edy.
>

Just to avoid misunderstanding here, all these hacks are not officially
supported. It is not recommended to attempt them on a production unit.


>
>
>
>>
>> Gianluca
>>
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>>
>
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