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1. • CommentRowNumber1.
   • CommentAuthorTobyBartels
   • CommentTimeNov 23rd 2009
   • PermaLink
   Author: TobyBartels
   Format: MarkdownThe Ruby on Rails app underlying the Lab seems to have gone down about 15–30 minutes ago, and it's too big for me to handle. But I've written Andrew about it.

   The Ruby on Rails app underlying the Lab seems to have gone down about 15–30 minutes ago, and it's too big for me to handle. But I've written Andrew about it.

2. • CommentRowNumber2.
   • CommentAuthorTobyBartels
   • CommentTimeNov 23rd 2009
   • PermaLink
   Author: TobyBartels
   Format: MarkdownIt's back; hoorah for Andrew!

   It's back; hoorah for Andrew!

3. • CommentRowNumber3.
   • CommentAuthorAndrew Stacey
   • CommentTimeNov 23rd 2009
   • PermaLink
   Author: Andrew Stacey
   Format: MarkdownFixed. This crash was due to a slight difference between the nlab version of instiki and the official version. It's very minor, but caused a conflict in the latest update that the automatic updater couldn't resolve. I'll see what methods we can put in place to prevent this in future. Options are: 1. Only do updates when someone who can deal with such things is online. 2. Provide an automatic checker so that if there are conflicts, the update isn't done. 3. Provide an easy rollback script so that if there are conflicts, a labelf with enough access can easily roll back the update until someone who can deal with such things can check it. I don't like option 1 as these things should be rare but there are frequent updates so this feels like cutting ones arm off because one sometimes gets a torn fingernail. Option 2 is my preferred option, but I don't yet know if it's possible (haven't looked, though). Option 3 would be the easiest as it just involves writing some instructions. For non-technically minded people, the only thing you need to worry about is what the crash _looked like_. It was a great big multi-coloured page with lots of technical code on it with a big header saying "Ruby on Rails application cannot be started". If you get that again, save the page and email it to me. For lab elves, an error like this means that the main pieces of the infrastructure are working. To see anything complicated means that apache is working, to see an error message giving details of why the application could not be started means that ruby-on-rails _itself_ is working. These are the two pieces covered by the "hard" and "soft" restarts respectively, so that's why they didn't work in this instance.

   Fixed.

   This crash was due to a slight difference between the nlab version of instiki and the official version. It's very minor, but caused a conflict in the latest update that the automatic updater couldn't resolve. I'll see what methods we can put in place to prevent this in future. Options are:

   1. Only do updates when someone who can deal with such things is online.
   2. Provide an automatic checker so that if there are conflicts, the update isn't done.
   3. Provide an easy rollback script so that if there are conflicts, a labelf with enough access can easily roll back the update until someone who can deal with such things can check it.

   I don't like option 1 as these things should be rare but there are frequent updates so this feels like cutting ones arm off because one sometimes gets a torn fingernail. Option 2 is my preferred option, but I don't yet know if it's possible (haven't looked, though). Option 3 would be the easiest as it just involves writing some instructions.

   For non-technically minded people, the only thing you need to worry about is what the crash looked like. It was a great big multi-coloured page with lots of technical code on it with a big header saying "Ruby on Rails application cannot be started". If you get that again, save the page and email it to me.

   For lab elves, an error like this means that the main pieces of the infrastructure are working. To see anything complicated means that apache is working, to see an error message giving details of why the application could not be started means that ruby-on-rails itself is working. These are the two pieces covered by the "hard" and "soft" restarts respectively, so that's why they didn't work in this instance.

4. • CommentRowNumber4.
   • CommentAuthorTobyBartels
   • CommentTimeNov 23rd 2009
   • PermaLink
   Author: TobyBartels
   Format: MarkdownYeah, (2) seems ideal, but (3) would still be good if (2) doesn't work (or takes a long time to get to work).

   Yeah, (2) seems ideal, but (3) would still be good if (2) doesn't work (or takes a long time to get to work).