Invalid yield in layout.erb about dashing-icinga2

[mocdaniel]

I just confirmed this error and noticed that this yield-thing caused trouble in older versions of dashing-icinga2 already, but didn't break the dashboard. For some reason, thin redirects requests to / to /layout in this container's version instead of rendering the actual dashboard - a fix will be available soon.

[mocdaniel]

Fixed in 5ed16c9, dbodky/dashing-icinga2:latest over on DockerHub should work again as well.

Long story short: Dockerfile used ruby:buster as base image and thus something like ruby:buster:latest implicitly. Ruby 3.X and the gems coming with it broke the templating language used in template.erb, apparently (I am no ruby specialist :D). I pinned the ruby version to use to 2.7.X by changing the base image to ruby:2.7-buster for now. I'm going to go ahead and close this issue for now.

[srgzx]

Hi, I know this is a long shot, but I am working on a project that uses Sinatra and Thin that has this exact same problem, and I am attempting to learn what's causing it and how to make it compatible with Ruby 3.x. I am not a Ruby specialist either, unfortunately. If you or anyone else can remember exactly what is going on here, or can suggest how to fix it other than downgrading to Ruby 2.7, I would appreciate it. Cheers.