CentOS virt - Jul 2018 - AWS c5d.9/18xlarge instances not supported

Hi,

why are larger AWS instances c5d.9xlarge and c5d.18xlarge (NVMe SSD attached)
NOT supported by Centos7 AMI,

while smaller instances (e.g. c5d.4xlarge) are supported?

Also regular c5.9/18xlarge are supported.



Thanks, Jens-Uwe



Jens-Uwe Schl??ler









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On Sat, Jul 14, 2018 at 7:41 AM, Jens-Uwe Schluessler
<jens-uwe.schluessler at tu-dresden.de> wrote:
> Hi,
>
> why are larger AWS instances c5d.9xlarge and c5d.18xlarge (NVMe SSD
> attached) NOT supported by Centos7 AMI,
It wouldn't be the first time. I had problems with the i3 instances
when they first came out, and I've been dealing with kernel/hardware
incompatibilities with Linux kernels since.... 2000. New hardware, and
even new virtualization toolkits that interact with both the
supporting hardware and the virtualization layer, can have startling
interactions. That's why testing is so critical.
> while smaller instances (e.g. c5d.4xlarge) are supported?
>
> Also regular c5.9/18xlarge are supported.
See above. Also, the base CentOS 7 3.10.0 kernel is becoming a bit
dated: it's 5 years old now. If you have time: can you set up a
smaller instance, do kernel updates on top of a CentOs 7 AMI, and see
if *that* AMI is compatible with the new instances? Might make for an
interesting test and get you a working AMI.

It seems, c5d.9xlarge and c5d.18xlarge are excluded by intention, already
grayed out in AWS instance start console.
Other providers (RH) enable them too.
Thanks

-----Urspr?ngliche Nachricht-----
Von: CentOS-virt <centos-virt-bounces at centos.org> Im Auftrag von Nico
Kadel-Garcia
Gesendet: Samstag, 14. Juli 2018 14:22
An: Discussion about the virtualization on CentOS <centos-virt at
centos.org>
Betreff: Re: [CentOS-virt] AWS c5d.9/18xlarge instances not supported

On Sat, Jul 14, 2018 at 7:41 AM, Jens-Uwe Schluessler
<jens-uwe.schluessler at tu-dresden.de> wrote:
> Hi,
>
> why are larger AWS instances c5d.9xlarge and c5d.18xlarge (NVMe SSD
> attached) NOT supported by Centos7 AMI,
It wouldn't be the first time. I had problems with the i3 instances when
they first came out, and I've been dealing with kernel/hardware
incompatibilities with Linux kernels since.... 2000. New hardware, and even
new virtualization toolkits that interact with both the supporting hardware
and the virtualization layer, can have startling interactions. That's why
testing is so critical.
> while smaller instances (e.g. c5d.4xlarge) are supported?
>
> Also regular c5.9/18xlarge are supported.
See above. Also, the base CentOS 7 3.10.0 kernel is becoming a bit
dated: it's 5 years old now. If you have time: can you set up a smaller
instance, do kernel updates on top of a CentOs 7 AMI, and see if *that* AMI
is compatible with the new instances? Might make for an interesting test and
get you a working AMI.
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CentOS-virt at centos.org
https://lists.centos.org/mailman/listinfo/centos-virt
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On Sat, Jul 14, 2018 at 5:22 AM Nico Kadel-Garcia <nkadel at gmail.com>
wrote:
> See above. Also, the base CentOS 7 3.10.0 kernel is becoming a bit
> dated: it's 5 years old now. If you have time: can you set up a
> smaller instance, do kernel updates on top of a CentOs 7 AMI, and see
> if *that* AMI is compatible with the new instances? Might make for an
> interesting test and get you a working AMI.
I did this with CentOS 6 at some point, and it's worth noting that
you'll have to build your own AMI from scratch, you can't just update
the existing AMI- the base AMI's lack of support "taints" derived
ones.

I used packer's chroot builder, it was pretty reasonable and you can
find examples online to help you get started.

-- 
-----------------------
| Henry Finucane
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