Question
Docker Image Cache When using an older ruby 1.9.3
- Posted on January 8, 2021
- DigitalOcean App PlatformRubyRuby on Rails
Asked by manpreetnarang
When building Dockerfile from an older version of ruby I’m getting a docker-cache error, see my Dockerfile to reproduce this error.
FROM ruby:1.9.3-p551
# Create app directory
RUN mkdir -p /app
WORKDIR /app
ENV RAILS_ENV=production
COPY . /app/
COPY Gemfile /app/
COPY Gemfile.lock /app/
RUN sed -i '/jessie-updates/d' /etc/apt/sources.list
# Install dependencies
RUN apt-get update && apt-get install -qq -y build-essential nodejs npm && apt-get install -qq -y zip
RUN bundle install
RUN mkdir -p log
RUN touch $RAILS_ENV.log
RUN cp /usr/share/zoneinfo/America/Toronto /etc/localtime
#RUN bundle exec sidekiq -d -e $RAILS_ENV -C config/sidekiq.yml -L log/$RAILS_ENV.log
ENTRYPOINT ["bundle", "exec"]
EXPOSE 3000
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Hi @manpreetnarang, if you are seeing this error in your App Platform builds, it is because the
ruby:1.9.3-p551image uses a deprecated v1 Docker image manifest, which is not supported by App Platform.As a workaround you can pull the image locally and push it to your own account, which will upgrade the manifest to v2, and then update the Dockerfile
FROMto use your own version of the image:Let me know if that works!
Reference: https://docs.docker.com/registry/spec/deprecated-schema-v1/
Hi there @manpreetnarang,
What is the exact
docker buildcommand that you are using? Also can you share the exact error that you are getting?One thing that I could suggest is making sure that you have the base image in place with the
docker imagescommand.As far as I can see it is still present on Dockerhub:
https://hub.docker.com/_/ruby?tab=tags&page=1&ordering=last_updated&name=1.9.3-p551
Regards, Bobby