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    • CommentRowNumber1.
    • CommentAuthorDavidRoberts
    • CommentTimeMar 2nd 2010

    I'm not trying to edit or anything crucial, but the nLab seems to have gone down completely.

    • CommentRowNumber2.
    • CommentAuthorTim_Porter
    • CommentTimeMar 2nd 2010

    Its back!

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeMar 2nd 2010

    Thanks, yes. I have restarted it.

    • CommentRowNumber4.
    • CommentAuthorAndrew Stacey
    • CommentTimeMar 2nd 2010

    Bleugh. This seems to be the "Help, something changed on the disk and I can't cope so I'm shutting down completely" issue which I have no idea why it happens as it really ought not to do so. This is now the third (by my count) occurrence.

    • CommentRowNumber5.
    • CommentAuthorTim_Porter
    • CommentTimeMar 7th 2010

    The n-Lab seems to be very sick this afternoon. I think it has just crashed. It was similarly sick this morning (7.30 o'clock UK time) but then that seemed to clear up.

    • CommentRowNumber6.
    • CommentAuthorTim_Porter
    • CommentTimeMar 7th 2010

    It seems to go down at the weekend. Is this due to maintenance ?

    • CommentRowNumber7.
    • CommentAuthorTobyBartels
    • CommentTimeMar 8th 2010

    For the record, it's up at the moment.

    • CommentRowNumber8.
    • CommentAuthorTim_Porter
    • CommentTimeMar 8th 2010

    It seemed to come up late yesterday (9 hours ago).

    • CommentRowNumber9.
    • CommentAuthorAndrew Stacey
    • CommentTimeMar 8th 2010

    My instinct would be to say that it is not that it crashes more at the weekend, it's more that there's fewer lab elves around to restart it.

    That said, it does seem to happen more often at weekends than weekdays. There appear to be two kinds of "crash": either some idiot decides that they are going to download the entire nlab in one go, tying up the server and grinding it to a halt. Or there's some mystery bug whereby instiki (or one of the components running it) doesn't like it when the logs rotate, or instiki gets updated, while it's trying to do something. For some reason, this has happened mainly on weekends.

    I'm not sure what yesterday's is down to, I'll investigate.

    • CommentRowNumber10.
    • CommentAuthorAndrew Stacey
    • CommentTimeMar 8th 2010

    It really would help if we had someone who knew what they were doing working for the nlab! Yet again, I've fallen into the trap of thinking that something that is set up correctly on Jacques' installation of Instiki will automatically be set up correctly on ours. In this case, it was the 'robots.txt' file. There is one in the base directory of the instiki installation so I assumed it was set up correctly. Now that I've read the official docs, I see that it's not a trivial job to make this automatic, and it's not even knowable (by instiki) where this file ought to be, so it's up to the Responsible System Administrator to ensure that it is in the right place.

    I've now done that. So, for each web on the nlab, robots are respectfully requested not to request addresses that begin with:

    feeds
    export
    revision
    show/diff
    print
    tex
    pdf
    list
    

    If anyone with a personal web would like robots to traverse those links, please let me know (and explain why). If anyone has any other possibilities of things that I may have overlooked, also please let me know.

    Incidentally, there best I can come up with for the slow-down yesterday was a spike in traffic. Slurping through the logs and looking at the number of requests per minute, then we have considerable spikes at 07:34/5 and at 07:42/3. Then a massive spike at 09:37.

    There wasn't an actual crash over the weekend, though. The logs show no record of it needing restarting. I think it was just a vast quantity of requests. The 'robots.txt' file should tame that a little.

    • CommentRowNumber11.
    • CommentAuthorUrs
    • CommentTimeMar 8th 2010

    Thanks, Andrew!!

    • CommentRowNumber12.
    • CommentAuthorTim_Porter
    • CommentTimeMar 8th 2010

    I echo that. The forum is extremely useful and could not work without the contribution of Andrew. Thanks.

    • CommentRowNumber13.
    • CommentAuthorAndrew Stacey
    • CommentTimeMar 8th 2010

    Thanks! I appreciate being appreciated!

    • CommentRowNumber14.
    • CommentAuthorEric
    • CommentTimeMar 8th 2010

    I also echo that. Thank you Andrew! I am ever more amazed at what you guys have created here.

    • CommentRowNumber15.
    • CommentAuthorTim_Porter
    • CommentTimeSep 2nd 2018

    The nLab server seems to be off! I got through briefly a few minutes ago, but then got

    Error 502 Ray ID: 453dd8e56f83bc50 • 2018-09-02 06:16:21 UTC Bad gateway

    • CommentRowNumber16.
    • CommentAuthorRichard Williamson
    • CommentTimeSep 2nd 2018
    • (edited Sep 2nd 2018)

    I’m on it. This is caused by something I am trying to fix. Unfortunately the Cloudfare layer in front of the nLab is very unhelpful in this regard; I do not have control over it.

  1. Just to confirm that the nLab will be unstable until further notice, so best to avoid editing until I make an announcement here.

  2. Should hopefully be stable for editing now. Need to look further into the asynchronous stuff, but this is not critical. Will return to it later, cannot look into it further just now.

  3. I will be doing some further work/testing on the asynchronous stuff now. This may cause disruption; if editing, please make sure to save your edits before you submit!

    • CommentRowNumber20.
    • CommentAuthorRichard Williamson
    • CommentTimeSep 2nd 2018
    • (edited Sep 2nd 2018)

    Should be stable again now. Asynchronous stuff still not working properly in general, but it is not a critical problem (in many cases it should not be noticeable). Will return to it when I get the chance.

    • CommentRowNumber21.
    • CommentAuthorUrs
    • CommentTimeSep 2nd 2018

    Just to say that right now all requests to the nLab produce Error 502.

    • CommentRowNumber22.
    • CommentAuthorUrs
    • CommentTimeSep 2nd 2018

    Sorry, false alarm, all good now.

  4. Have switched off the asynchronous rendering completely until I have time to work on it (hopefully later today). Have some ideas of how to get around the problems, but no time just now.

    • CommentRowNumber24.
    • CommentAuthorGuest
    • CommentTimeApr 28th 2021
    The nlab was down briefly earlier today, between 11am and 11:30am central european time. I was advised to report this here; no further advice needed, since it's back up again. Morgan
    • CommentRowNumber25.
    • CommentAuthorRichard Williamson
    • CommentTimeApr 28th 2021
    • (edited Apr 28th 2021)

    Thank you for mentioning this, and apologies to all for the inconvenience. Yes, Urs alerted me and I was able to bring the server back to life. I was at work and not available to debug the root cause unfortunately. There have been a couple of other occasions recently where we’ve had brief issues of a similar kind. The planned fix for this kind of thing is the move to the cloud, where a completely different infrastructure will be involved,

    • CommentRowNumber26.
    • CommentAuthorTim_Porter
    • CommentTime5 days ago

    Is the nLab down?

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