[RUBY] I built a rails environment with docker and mysql, but I got stuck

I made a rails environment in docker https://qiita.com/NA_simple/items/5e7f95ae58eec5d20e1f

If for some reason it doesn't work on the way, it seems that mysql-clients can't be installed. Refer to the URL below for how to rewrite. https://qiita.com/yagi_eng/items/1368fb2a234629a0c8e7

I'm addicted to it when I'm on the right track.


$ docker-compose run web rails db:create
Starting postgress_db ... done
Could not find activesupport- in any of the sources
Run `bundle install` to install missing gems.

Why is the ruby version different? ?? When I searched for the version in rbenv, I couldn't find 2.7.1. rbenv noticed old and updated

Update rbenv https://qiita.com/pugiemonn/items/f277440ec260b8d4fa6a

I noticed that the gem from was also old,


$ gem update

I haven't gone yet ... Perform bundler update.

I was desperate here and there, so I'll give it some time.

Organize once and start the procedure from the beginning of a different site.


Start docker and access localhost without stopping! !! !! Alright! !! !! !!


Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

Why: D It seems that there is no file when I google, so there are some articles that I forcibly make with sudo touch. But I deleted and created it thinking that there is a file

Same error.

?? ?? ?? I think, I notice that I have not launched mysql here This is it! !! !! I thought


mysql.server start

Is executed, but it does not start. Apparently when I google


sudo rm mysql.sock
brew uninstall mysql
brew install mysql

After deleting the sock file, uninstall mysql → install it. The path of mysql.sock was found in the previous error, so delete it


mysql.server start

... passed! !! !! !!

Did this go ...?


Yatter --------! !! !! !! !! !! !! !! !!

I think it was faster to build after understanding docker. Let's study again. myself.

Anyway, I'm glad I moved

Contents of each final file ↓


source 'https://rubygems.org'
gem 'rails', '~>6'


version: '3'
    image: mysql:8.0
      - '3306:3306'
    command: --default-authentication-plugin=mysql_native_password
      - mysql-data:/var/lib/mysql
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b ''"
      - .:/myapp
      - "3000:3000"
      - db
    stdin_open: true
    tty: true
    command: bundle exec rails server -b
    driver: local


FROM ruby:2.7
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
    && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
    && apt-get update -qq \
    && apt-get install -y nodejs yarn \
    && mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]

CMD ["rails", "server", "-b", ""]

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