Jack Moore

Email: jack(at)jmoore53.com
Project Updates

Production Dockerfile and the Most Cryptic Error Message I've Ever Faced

05 Aug 2019 » containers, docker, commandcenter

Ran This:

RUN RAILS_ENV=production rake assets:precompile

Received this:

Compilation Failed:


I was in the middle of building a docker production image for a rails application with precompiled javascript assets baked into the image and this error kept occuring within the Alpine image I was attempting to precompile the assets.

TLDR: I am still new to Javascript (and I am really starting to come around to it), but I was using both yarn and npm. Webpacker does not like this. package.json does not like this. package-lock.json doesn’t like this. I am pretty sure yarn.lock doesnt like this. And even Rails didnt like this! It was just a bad combo.

When you see an error what do you do?

I saw this error and I had no idea what to do. Usually I am pointed to a line number or a method that is broken due to failed dependencies. This was new to me. This error failed silently reporting no issues besides this note and exiting from the docker build with an exit status of 1.

I was really stuck for a while and didn’t know what to do, so I did what any hacker would do and Googled it. Google came up with a few issues

Update Alpine Packages to Edge!


What the crust. There were 2 different node versions I needed to get the most current yarn version and the latest npm version for the image.

© Jack Moore