Error on initial visit (ActionView::Template::Error (failed to get urandom))

[johanohly]

I got Maybe running via the docker guide, but visiting the homepage yields a generic error message:

The logs reveal this error message:

maybe-app-1       | I, [2024-12-18T09:21:25.442233 #1]  INFO -- : [2d014350-1ec4-4b51-9153-4c5e92ea0da0] Started GET "/registration/new" for 185.26.63.45 at 2024-12-18 09:21:25 +0000
maybe-app-1       | I, [2024-12-18T09:21:25.453065 #1]  INFO -- : [2d014350-1ec4-4b51-9153-4c5e92ea0da0] Processing by RegistrationsController#new as HTML
maybe-app-1       | I, [2024-12-18T09:21:25.639330 #1]  INFO -- : [2d014350-1ec4-4b51-9153-4c5e92ea0da0]   Rendered layout layouts/auth.html.erb (Duration: 28.8ms | GC: 0.0ms)
maybe-app-1       | I, [2024-12-18T09:21:25.641263 #1]  INFO -- : [2d014350-1ec4-4b51-9153-4c5e92ea0da0] Completed 500 Internal Server Error in 187ms (ActiveRecord: 23.3ms (3 queries, 0 cached) | GC: 0.0ms)
maybe-app-1       | E, [2024-12-18T09:21:25.651803 #1] ERROR -- : [2d014350-1ec4-4b51-9153-4c5e92ea0da0]   
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] ActionView::Template::Error (failed to get urandom):
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] 
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     34:       disabled: @invitation.present? %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     35:   <%= form.password_field :password, autocomplete: "new-password", required: "required", label: true, maxlength: 72 %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     36:   <%= form.password_field :password_confirmation, autocomplete: "new-password", required: "required", label: true %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     37:   <% if invite_code_required? && !@invitation %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     38:     <%= form.text_field :invite_code, required: "required", label: true, value: params[:invite] %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     39:   <% end %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]     40:   <%= form.hidden_field :invitation, value: @invitation&.token %>
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0]   
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] app/controllers/concerns/invitable.rb:11:in `invite_code_required?'
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] app/controllers/concerns/invitable.rb:5:in `invite_code_required?'
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] app/helpers/forms_helper.rb:4:in `styled_form_with'
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] app/views/registrations/new.html.erb:27
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] app/controllers/concerns/localize.rb:17:in `switch_timezone'
maybe-app-1       | [2d014350-1ec4-4b51-9153-4c5e92ea0da0] app/controllers/concerns/localize.rb:12:in `switch_locale'

[smcpeck]

From within the container, can you consume /dev/urandom normally?

Try something like:

tr -dc A-Za-z0-9 </dev/urandom | head -c 13; echo

References:
https://www.reddit.com/r/rails/comments/ldfos4/cant_seed_db_keep_getting_failed_to_get_urandom/?rdt=51370
https://unix.stackexchange.com/questions/230673/how-to-generate-a-random-string

[johanohly]

Yes, that seems to run without an issue. I am running Maybe on a synology NAS, which does run a pretty limited version of Linux, but I've only encountered a straight up incompatibility with one other container (it was the cocalc docker image, but 30+ run without issue).

[johanohly]

I think I may have found a similar case in another Ruby project being run on a Synology.
Freika/dawarich#233
fixed by
Freika/dawarich#280

[bokkoman]

I have the same issue.

Logs:

I, [2025-03-17T15:06:58.963255 #1]  INFO -- : Processing by RegistrationsController#new as HTML
I, [2025-03-17T15:06:59.006919 #1]  INFO -- :   Rendered registrations/new.html.erb within layouts/auth (29.6ms)
F, [2025-03-17T15:06:59.013764 #1] FATAL -- : ActionView::Template::Error (failed to get urandom)

[fsteinmann]

Are you on a Synology platform as well? For me it doesn't work on Synology 1517+ with DSM 7

[bokkoman]

Yes, ds1815+ dsm7.1.x

[mcontreras]

Same for me, DSM 7.2.1 on a DS216+

[blakeusblade]

I found my underlying issue...

Marius mentions this on his web page (link below) Number 10...
mariushosting

Its actually mentioned as an issue on some synology NAS's that have kernel versions lower than 4. I'm running an unsupported kernel version of 3 on my Synology NAS with no possible way of upgrading even though its 2017 year model synology NAS.

I'll link this in the #1554 discussion..

[mcontreras]

That's right. I just checked and my Synology has an outdated Kernel (3.10).

[johanohly]

This doesn't really help though. It just reinforces the fact that Maybe needs to use an alternative way of generating random numbers, if they want to support many of the existing Synology NAS'.

[daFailer]

I have the same Problem. Maybe is running on a Synology NAS via Portainer. The Linux Version is 3.10.108 and can't be updated.

What surprises me is that when I run “tr -dc A-Za-z0-9 </dev/urandom | head -c 13; echo” inside the Maybe container, it works without any problems.

Are there any plans to solve this problem or is it too niche?