Sage Cell Server

[Ingo Dahn]

Hi,

the Sage Cell server, which I plan to use for a Sage introduction workshop in the near future, seems to be down, which led me to the question whether I can set up my own Sage cell server when I install Sage on my server. 

B.t.w the Android Sage app on the Google PlayStore doesn't seem to be working - no reaction when evaluating a cell, even for the provided examples, but that's not as important for me as long as I can access the cell server.

[slelievre]

Fri 2017-01-27 11:28:49 UTC+1, Ingo Dahn:

Which server is down? This one seems to be working for me:

    http://aleph.sagemath.org

I think the Sage app for Android relies on the availability of

one of the Sage cell servers.

Best, Samuel

[David Joyner]

On Fri, Jan 27, 2017 at 5:28 AM, Ingo Dahn <ingo...@gmail.com> wrote:
> Hi,
> the Sage Cell server, which I plan to use for a Sage introduction workshop
> in the near future, seems to be down, which led me to the question whether I

http://sagecell.sagemath.org/ works for me. However, I confirm that
the android sagemath app is not working for me either. There is info
on setting up your own sagecell server here:
https://github.com/sagemath/sagecell

> can set up my own Sage cell server when I install Sage on my server.
> B.t.w the Android Sage app on the Google PlayStore doesn't seem to be
> working - no reaction when evaluating a cell, even for the provided
> examples, but that's not as important for me as long as I can access the
> cell server.
>

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[slelievre]

On my side, connection to

    http://sagecell.sagemath.org 

times out.

Requests to sagecell.sagemath.org are sent to several different servers,

depending on where you connect from. There are servers in two universities

in Spain and Germany (I imagine all Europe requests are routed there) and

one server at Google Compute Engine (I imagine all North America requests

are routed there).

See https://wiki.sagemath.org/Infrastructure

I don't know if you can bypass the routing algorithm and decide to connect

to a given sagecell server.

Your workaround for now is that the aleph.sagemath.org server seems to be

working for all.

Samuel

[Ingo Dahn]

It is http://sagecell.sagemath.org/ that I call and that times out. The real problem is that I use a set of prepared HTML pages with embedded calls to this URL and I would like to avoid having to change them shortly before a workshop. From https://wiki.sagemath.org/Infrastructure I see that there is a server at Frankfurt University in Germany to which I am probably routed as I am nearby.Is there any admin contact at Frankfurt which I may call for support?

Ingo

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[Ingo Dahn]

I confirm that I can use my worksheets if I replace https://sagecell.sagemath.org with http://aleph.sagemath.org. However when I call the aleph server with https I get an net::ERR_INSECURE_RESPONSE error which may be a problem if I make the call from within our LMS which blocks all unsecured connections.

[kcrisman]

> the Sage Cell server, which I plan to use for a Sage introduction workshop
> in the near future, seems to be down, which led me to the question whether I

http://sagecell.sagemath.org/ works for me. However, I confirm that
the android sagemath app is not working for me either.

Yeah, I think that hasn't been updated recently.  I know Volker had a GSOC student working on it at one point, so it should have been working, but I'm not sure if Andrey made any changes recently that might have invalidated that?

[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!