How do you diagnose a 500 error on Heroku when there is no error message in the logs?

Posted by lala on Stack Overflow See other posts from Stack Overflow or by lala
Published on 2013-10-16T18:18:18Z Indexed on 2013/10/19 9:55 UTC
Read the original article Hit count: 343

Filed under:

ruby-on-rails

|

heroku

|

internal-server-error

I have a Rails app on Heroku that is serving 500 errors at random intervals. Web pages will display "Internal server error" in plain text, instead of the usual "We're sorry. Something went wrong." page. When I refresh the page, it works fine.

The logs don't show me an error message, just

» 14:20:34.107 2013-10-11 12:20:33.763690+00:00 heroku router - - at=info method=HEAD path=/ host=www.mydomain.com fwd="184.73.237.85/ec2-184-73-237-85.compute-1.amazonaws.com" dyno=web.1 connect=1ms service=63ms status=200 bytes=0
» 14:21:03.957 2013-10-11 12:21:03.561867+00:00 heroku router - - at=info method=GET path=/ host=www.mydomain.com fwd="50.112.95.211/ec2-50-112-95-211.us-west-2.compute.amazonaws.com" dyno=web.1 connect=0ms service=1ms status=500 bytes=21

Support has told me to look at request queuing in New Relic, but New Relic only shows a big red mark saying the server is down (even though the site works fine when refreshed).

With no error messages, I'm at a loss for how to diagnose this issue.

© Stack Overflow or respective owner

Related posts about ruby-on-rails

Ruby on Rails - How can I start? [closed]

as seen on Programmers - Search for 'Programmers'
I have misconception in understanding the relationship between Ruby language and Ruby on Rails Framework. Because of 'I am an absolute beginner' in web development I have no idea if I have to grasp the fundamentals of Ruby before I go with Ruby on Rails! I also want to ask who is behind both Ruby… >>> More
DES3 decryption in Ruby on Rails

as seen on Stack Overflow - Search for 'Stack Overflow'
My RoR server receives a string, that was encrypted in C++ application using des3 with base64 encoding The cipher object is created so: cipher = OpenSSL::Cipher::Cipher::new("des3") cipher.key = key_str cipher.iv = iv_str key_str and iv_str: are string representations of key and initialization… >>> More
Ruby on rails: Image downloads with Authentication/Authorization/Time outs

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi Guys, I'm having few doubts on implementing file downloads. I'm creating an app where I use attachment_fu with Amazon s3 to upload files. Things are working pretty well so far on uploading side. Now its the time to start the file downloads. Here is what I need, a logged in user search and browse… >>> More
Ruby on Rails deployment, on "thin" server with lot of attachments

as seen on Stack Overflow - Search for 'Stack Overflow'
A lot of PDFs are stored inside MySQL as a BLOB field for each PDF file. The average file size is 500K each. The Rails app will stream the :binary data as file downloads, where there is a user click on the download link. Assume there is a maximum of 5 users downloading 5 PDFs concurrently, what… >>> More
Apply Behavior Driven Development to Ruby on Rails with Rspec

as seen on Internet.com - Search for 'Internet.com'
Applying the Behavior Driven Development (BDD) methodology to your Rails development takes you beyond traditional Test Driven Development. Learn how to do it with the Ruby-based BDD framework RSpec. >>> More

Related posts about heroku

Hosting a website on Heroku.... I know how to, but im running into problems!

as seen on Pro Webmasters - Search for 'Pro Webmasters'
I'm starting to learn more on the back-end scale of programing. Recently I started up Heroku for the second or third time. This time I actually installed the Git update to my Mac and installed Heroku in the terminal. I wanted to upload a static html site with the Sinatra gem. Everything worked out… >>> More
Hosting a website on Heroku.... I know how to, but im running into problems!

as seen on Pro Webmasters - Search for 'Pro Webmasters'
I'm starting to learn more on the back-end scale of programing. Recently I started up Heroku for the second or third time. This time I actually installed the Git update to my Mac and installed Heroku in the terminal. I wanted to upload a static html site with the sinatra gem. Everything worked out… >>> More
Can't get heroku work with rails 3.x postgresql

as seen on Stack Overflow - Search for 'Stack Overflow'
I followed Heroku official guides to push rails project to heroku. The application.rb file is ok, I added pg gem and database.yml in the right way. When I push to heroku I get: -----> Preparing app for Rails asset pipeline Detected manifest.yml, assuming assets were compiled locally But when… >>> More
How to use Sprockets Rails plugin on Heroku?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I just deployed my Rails app to Heroku, but the Javascripts that were using Sprockets plugin don't work. I understood that, because my Heroku app is read-only, Sprockets won't work. I've found this sprockets_on_heroku plugin that should do the work, but I don't really get how to use it : I… >>> More
Error running heroku console. can't update heroku

as seen on Stack Overflow - Search for 'Stack Overflow'
When I try to run heroku console I get the following error: user@omnipresent:~/rails/demo$ heroku console ! This version of the heroku gem has been deprecated. ! Please update it by running: gem update heroku When I do the update..it says there is nothing to update! user@omnipresent:~/rails/demo$… >>> More