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The problem is that hostnames of nodes appear in /etc/hosts files, and
entries in those files have to be unique to make any sense. Thus, we either
need to provide a user with ability to create their own generators of node
names (not sure that's makes sense), require a user to provide a name for
every node and validate that every name is unique (which I guess the
blueprint in question implies), or provide ability to generate node
hostname by some user-defined template (prefix) suffixed with ID-based
iterator. We should choose one of options for every environment and don't
mix them, as Fedor pointed out.

-Oleg

On Fri, Jul 24, 2015 at 12:07 PM, Evgeniy L <eli at mirantis.com> wrote:

> Hi Andrew,
>
> I don't agree with you, user should be able to name the node any way he
> wants why there should be a constraint which is related to some internal id
> in Nailgun database? For example if he deleted node-5 and then he wants
> to replace this node with another one, he can and should be able to provide
> for this replacement node hostname node-5, even if node's id in the
> database
> is 6.
>
> Thanks,
>
> On Fri, Jul 24, 2015 at 2:36 AM, Andrew Woodward <xarses at gmail.com> wrote:
>
>>
>>
>> On Wed, Jul 22, 2015 at 6:32 AM Fedor Zhadaev <fzhadaev at mirantis.com>
>> wrote:
>>
>>> Thanks for your answers.
>>>
>>> Let me clarify some points:
>>>
>>> Sure, we have to validate hostnames during node renaming. And sure we do
>>> it. This issue appears when we already have node with name 'node-X' and new
>>> node is created without providing custom name. I'll give you the example:
>>>
>>> 1. User has node with hostname 'node-4' (with ID = 4; and there no nodes
>>> with ID > 4) ;
>>> 2. He renames it in 'node-5' (this name is correct and unique. OK)
>>> 3. He adds new node without providing custom hostname.
>>>     New node gets ID = 5 (it's primary key and increments automatically)
>>> and default hostname 'node-5'. (Here we have a problem with uniqueness.)
>>>
>>> It will be strange if we refuse to create node with default name if
>>> somebody has renamed another node using this name.
>>>
>>> About nodes hostnames. Actually we can't refuse to use custom hostnames
>>> in format 'node-{#}' because it is one of the main use cases. So we need to
>>> find the solution which accepts such renaming.
>>>
>> How is this a main use case? This is exactly what we should not support.
>> If they want the node to have 'node-5' as it's hostname we need them to be
>> node.id = 5 (IE the node id in the DB is 5) They would not need custom
>> node naming in this case.
>>
>>>
>>> 2015-07-22 12:42 GMT+03:00 Igor Kalnitsky <ikalnitsky at mirantis.com>:
>>>
>>>> Hi guys,
>>>>
>>>> @Sergii, it looks like you misunderstood something. `node-uuid` is not
>>>> a general use case. It's only about conflicting nodes, and I'm sure
>>>> everyone's going to change such a hostname in order to avoid
>>>> confusion.
>>>>
>>>> @Andrew,
>>>>
>>>> a) Database refuses hostnames that break unique constraint, sot it'll
>>>> work out-of-box.
>>>>
>>>> b) I like this idea. I think refusing `node-id` where `id` is not
>>>> actually a node id is good idea. It solves our problem.
>>>>
>>>> Thanks,
>>>> Igor
>>>>
>>>> On Wed, Jul 22, 2015 at 8:21 AM, Sergii Golovatiuk
>>>> <sgolovatiuk at mirantis.com> wrote:
>>>> > node-uuid is very terrible from UX perspective of view. Ask support
>>>> people
>>>> > if they are comfortable to ssh such nodes or telling the name in phone
>>>> > conversation with customer. If we cannot validate FQDN of hostname I
>>>> would
>>>> > slip this feature to next release where we can pay more attention to
>>>> > details.
>>>> >
>>>> > --
>>>> > Best regards,
>>>> > Sergii Golovatiuk,
>>>> > Skype #golserge
>>>> > IRC #holser
>>>> >
>>>> >
>>>> __________________________________________________________________________
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>>>> >
>>>>
>>>>
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>>>
>>>
>>>
>>> --
>>> Kind Regards,
>>> Fedor Zhadaev
>>> Junior Software Engineer, Mirantis Inc.
>>> Skype: zhadaevfm
>>> E-mail: fzhadaev at mirantis.com
>>>
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>> --
>>
>> --
>>
>> Andrew Woodward
>>
>> Mirantis
>>
>> Fuel Community Ambassador
>>
>> Ceph Community
>>
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>>
>
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