Node IDs?

[Tim Hockin]

What's the difference between NodeSystemInfo.MachineID and
.SystemUUID? I want to log something that has no risk of privacy
information but is also not going to be deprecated. I'm a fan of
UUIDs, so I hope that wins, but I just need someone with context to
tell me which field to use.

Tim

[Vishnu Kannan]

I'd recommend using `MachineID` since `SystemUUID` can be the BIOS ID at times.  

Tim

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[Tim Hockin]

Dawn said one is to be EOL'ed ? what is Machine ID? How is it
generated and what does it hold?

On Fri, Aug 26, 2016 at 2:04 PM, Vishnu Kannan <vis...@google.com> wrote:
> I'd recommend using `MachineID` since `SystemUUID` can be the BIOS ID at
> times.
>
> On Fri, Aug 26, 2016 at 11:08 AM, 'Tim Hockin' via kubernetes-sig-node
> <kubernete...@googlegroups.com> wrote:
>>
>> What's the difference between NodeSystemInfo.MachineID and
>> .SystemUUID? I want to log something that has no risk of privacy
>> information but is also not going to be deprecated. I'm a fan of
>> UUIDs, so I hope that wins, but I just need someone with context to
>> tell me which field to use.
>>
>> Tim
>>
>> --
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[Vishnu Kannan]

http://man7.org/linux/man-pages/man5/machine-id.5.html

On Fri, Aug 26, 2016 at 2:09 PM, 'Tim Hockin' via kubernetes-sig-node <kubernete...@googlegroups.com> wrote:

Dawn said one is to be EOL'ed ?  what is Machine ID?  How is it
generated and what does it hold?

On Fri, Aug 26, 2016 at 2:04 PM, Vishnu Kannan <vis...@google.com> wrote:
> I'd recommend using `MachineID` since `SystemUUID` can be the BIOS ID at
> times.
>
> On Fri, Aug 26, 2016 at 11:08 AM, 'Tim Hockin' via kubernetes-sig-node
> <kubernetes-sig-node@googlegroups.com> wrote:
>>
>> What's the difference between NodeSystemInfo.MachineID and
>> .SystemUUID?  I want to log something that has no risk of privacy
>> information but is also not going to be deprecated.  I'm a fan of
>> UUIDs, so I hope that wins, but I just need someone with context to
>> tell me which field to use.
>>
>> Tim
>>
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>
>

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[Dawn Chen]

We want to use MachineID for machine inventory manager, and on systemd node, it is assigned by systemd. Kubelet / cAdvisor reads both /etc/machine-id and /var/lib/dbus/machine-id. If both are empty, we just leave it as empty.

If I understand correctly, SystemUUID  is used by Redhat heavily for machine inventory manager, which is out of Kubernetes control. See: https://access.redhat.com/documentation/en-US/Red_Hat_Subscription_Management/1/html/RHSM/getting-system-uuid.html

SystemUUID is the one we talked about to deprecate, and quickly found Redhat is used heavily. 

[Tim Hockin]

Can we just get one field that is a UUID generated by kubelet or
something that that we can rely on in *all* installations? What you
just described is insane. TWO poorly documented fields, both
optional...

[Brandon Philips]

/etc/machine-id is used consistently on every modern linux using systemd. I would prefer that we continue that trend and use that field and generate our own only if /etc/machine-id doesn't exist.

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[Vishnu Kannan]

I agree with you Tim. Can we deprecate fields from v1.Node?

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[Brandon Philips]

On Fri, Aug 26, 2016 at 3:17 PM 'Dawn Chen' via kubernetes-sig-node <kubernete...@googlegroups.com> wrote:

If I understand correctly, SystemUUID  is used by Redhat heavily for machine inventory manager, which is out of Kubernetes control. See: https://access.redhat.com/documentation/en-US/Red_Hat_Subscription_Management/1/html/RHSM/getting-system-uuid.html

SystemUUID is the one we talked about to deprecate, and quickly found Redhat is used heavily. 

Can it be turned into a label field instead? Like "redhat.com/system-uuid"?

Brandon 

[Tim Hockin]

we probably can't deprecate fields but we can document which one(s) matter...

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[Brandon Philips]

To close the loop on this I put up a PR: https://github.com/kubernetes/kubernetes/pull/32937

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