Docker For Rails Developers - Chapter 2 Defining Our First Custom Image WORKDIR Correctoin

Dockerfile:

FROM ruby:2.6

RUN apt-get update -yqq
RUN apt-get install -yqq --no-install-recommends nodejs

COPY . /usr/src/app/

WORKDIR /usr/src/app/

RUN bundle install

The Dockerfile instructs us to copy the current directory into /usr/src/app/. Placing our directory myapp into /usr/src/app/.

Then the WORKDIR is defined as /usr/src/app/

And RUN bundle install.

This fails as bundle install should be run in the app directory. We’re in /usr/src/app/ but we should be in /usr/src/app/myapp.

The Dockerfile is corrected with

FROM ruby:2.6

RUN apt-get update -yqq
RUN apt-get install -yqq --no-install-recommends nodejs

COPY . /usr/src/app/

WORKDIR /usr/src/app/myapp

RUN bundle install