slimtoolkit/slim

Minified Rails/Unicorn startup failure

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#15 opened on Feb 28, 2016

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bughelp wanted

Description

config.ru:1:in <main>': cannot load such file -- rack/builder (LoadError) from /usr/local/bundle/gems/unicorn-4.9.0/lib/unicorn.rb:48:ineval' from /usr/local/bundle/gems/unicorn-4.9.0/lib/unicorn.rb:48:in block in builder' from /usr/local/bundle/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:768:incall' from /usr/local/bundle/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:768:in build_app!' from /usr/local/bundle/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:137:instart' from /usr/local/bundle/gems/unicorn-4.9.0/bin/unicorn:126:in <top (required)>' from /usr/local/bundle/bin/unicorn:16:inload' from /usr/local/bundle/bin/unicorn:16:in `'

Reported in this blog post: http://chrisstump.online/2016/02/23/docker-image-reduction-techniques-and-tools/

Similar Rails app: https://github.com/cstump/docker_example

Contributor guide

Tech stack
railsdocker
Domain
devopsbackend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
Ruby on RailsDockerSlim tool
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
First, reproduce the issue using the linked blog post and similar Rails app. Investigate whether the minified Docker image missing rack/builder causes the error. Check Slim's configuration for excluding necessary gems. Look at the official Slim documentation and existing tests for Rails/Unicorn support. Consider updating the issue with findings or closing if resolved.