Re: [sage-support] Sage Cell Server

[Andrey Novoseltsev]

Hello!

Note that we have a dedicated group sage-cell (cc-ed).

At the moment we have GCE for Americas and Madrid for everyone else including Europe. There are occasional power problems in the building with the Madrid server which are supposed to go away after this last time, we will see if that is indeed the case. These servers are responding to sagecell.sagemath.org and have valid security certificates. While it is unfortunate that there are such interruptions in Madrid, an equivalent machine in GCE would cost about $2000/year, so overall I am very happy that this hardware is provided to us.

Those who heavily rely on SageMathCell should indeed consider running their own servers to make sure there are no downtimes/slowdows at the worst possible moment and/or unexpected upgrades that may break some particular code. It is possible that SageMath Inc will provide such a service in the future.

aleph.sagemath.org should not be used or recommended at all.

As for Android app, I can't test it and found it difficult in the past to get much feedback on it or figure out who is responsible for it. Personally I think it should be removed from the app store since having an unmaintained and broken app is bad for reputation.

Thank you,
Andrey

[William Stein]

On Fri, Jan 27, 2017 at 4:21 PM, Andrey Novoseltsev <novo...@gmail.com> wrote:
> Hello!
>
> Note that we have a dedicated group sage-cell (cc-ed).
>
> At the moment we have GCE for Americas and Madrid for everyone else
> including Europe. There are occasional power problems in the building with
> the Madrid server which are supposed to go away after this last time, we
> will see if that is indeed the case. These servers are responding to
> sagecell.sagemath.org and have valid security certificates. While it is
> unfortunate that there are such interruptions in Madrid, an equivalent
> machine in GCE would cost about $2000/year, so overall I am very happy that
> this hardware is provided to us.
>
> Those who heavily rely on SageMathCell should indeed consider running their
> own servers to make sure there are no downtimes/slowdows at the worst
> possible moment and/or unexpected upgrades that may break some particular
> code. It is possible that SageMath Inc will provide such a service in the
> future.
>

Maybe say something about the service we (SageMath, Inc.) does provide
right now?

> aleph.sagemath.org should not be used or recommended at all.
>
> As for Android app, I can't test it and found it difficult in the past to
> get much feedback on it or figure out who is responsible for it. Personally
> I think it should be removed from the app store since having an unmaintained
> and broken app is bad for reputation.
>
> Thank you,
> Andrey
>

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William (http://wstein.org)

[Andrey Novoseltsev]

On Friday, 27 January 2017 17:26:13 UTC-7, William Stein wrote:

Maybe say something about the service we (SageMath, Inc.) does provide
right now?

Great point - SageMath, Inc. actually pays for the current GCE part of sagecell.sagemath.org - apart from the computational machine it hosts the global permalink database. (UTMOST grant should cover 2 years eventually.) And of course if account-less computations are not essential, SageMath, Inc. provides SageMathCloud!

[Ingo Dahn]

Hi,

what would be  the requirements for setting up our own public SageCell server? In particular

How much resources would a dedicated virtual machine for such a server need?

How much time of a qualified admin, experienced with maintaining servers on Ubuntu, would be approximately required for installation and maintenance?

[Andrey Novoseltsev]

I would recommend 4 CPU cores, 16GB RAM (extra swap is recommended), 50GB SSD (BTRFS with compression). For CPU and RAM the more the merrier, of course, while for disk space there isn't much point in going beyond 100GB.

As for admin time it is a bit hard to judge - everything is supposed to be automatic with instructions at
https://github.com/sagemath/sagecell/blob/master/contrib/vm/README.md
but if there are any issues or desire to clearly understand each step, it will take some time. Note that suggestions on improving and clarifying scripts and documentation are very much welcome!