[RUBY] Error encountered with notes when deploying docker on rails


FROM ruby:2.5.1
RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - && apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN mkdir /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", ""]

entrypoint.sh Directly under the project directory


set -e

rm -f /myapp/tmp/pids/server.pid

exec "$@"



version: '3'
      context: .
      dockerfile: Dockerfile
    command: bundle exec rails s -p 3000 -b ''
    tty: true
    stdin_open: true
      - db
      - "3000:3000"
      - .:/myapp:delegated
    image: mysql:5.7
      MYSQL_USER: root
      MYSQL_ROOT_PASSWORD: password
      - '3316:3306'
      - ./db/mysql/volumes:/var/lib/mysql

docker command related

#Container list(Including those that are stopped)
$ docker ps -a

#Container ID list
$ docker ps -a -q

#Delete container
$ docker rm [Container ID]

#(Forced) container deletion
$ docker rm -f [Container ID]

#Go inside the container
$ docker-compose exec web bash

#(1) Exit the container
$ exit
# (2)Get out of the container
Ctrl + P + Q (Without stopping the container)

Differences between docker-compose build, up, start, run

docker-compose build Build only the image, not the container. Of course, it doesn't even start the container

docker-compose up If there is an image cache, build and start the container from there. If there is no image cache, build the image with build and build / start the container.

docker-compose start

Launch any already built containers, if any (Stop the container with docker-compose stop)

docker-compose run Execute the command in the container of the service specified by the argument

$ docker-compose run web rails s
$ docker-compose run web rails c


Reference site for docker command

https://qiita.com/tegnike/items/bcdcee0320e11a928d46 [Reverse lookup of docker-compose command for beginners](https://qiita.com/okyk/items/a374ddb3f853d1688820 #) [Docker-compose command summary](https://qiita.com/wasanx25/items/d47caf37b79e855af95f#%E5%8F%82%E8%80%83%E3%83%AA%E3%83%B3%E3%82 % AF #)

If docker is slow

[Mac docker will be free from slow stress](https://qiita.com/ysKey2/items/346c429ac8dfa0aed892 #)


      - .:/project/sample_app:delegated

Error encountered

Autoprefixer doesn’t support Node v4.8.2.

web_1  | ActionView::Template::Error (Autoprefixer doesn’t support Node v4.8.2. Update it.):
web_1  |     3:   <head>
web_1  |     4:     <title><%= content_for?(:html_title) ? yield(:html_title) : "Japanepa.com" %></title>
web_1  |     5:     <%= csrf_meta_tags %>
web_1  |     6:     <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
web_1  |     7:     <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
web_1  |     8:     <%= Gon::Base.render_data %>
web_1  |     9:     <%= include_gon %>

Autoprefixer doesn’t support Node v4.8.2. "The thing that automatically adds Vender Prefixes is that the Gem called Autoprefixer doesn't support Node v4.8.2."

1. Measures for Autoprefixer do n’t support Node v4.8.2.

Ruby on Rails - Autoprefixer doesn’t support Node v4.9.1. Update it. How to fix? It seems that it can be fixed by inserting a gem called "mini_racer"

2. Measures for Autoprefixer do n’t support Node v4.8.2.

Autoprefixer doesn’t support Node v4.8.2. Update it

#Change before
RUN apt-get update -qq \ && apt-get install -y nodejs postgresql-client

#After change
RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - && apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*

Your Ruby version is 2.5.8, but your Gemfile specified 2.5.1 Error caused by different version of ruby However, the gemfile and dockerfile said:

source 'https://rubygems.org'
ruby '2.5.1'
FROM ruby:2.5.1

Countermeasures for Your Ruby version is 2.5.8, but your Gemfile specified 2.5.1

When I looked it up, the only solution was to match the ruby versions in the Gemfile and Dockerfile. Therefore, take the following countermeasures

"Uninstall and reinstall docker"

In fact, this solved the problem, but I can't recommend it in a too aggressive way.

Later, while investigating various dockers, I speculate that the following may be the cause.
  1. I used to launch a container with ruby 2.5.8, so that image remained.
  2. When docker-compose, instead of pulling the 2.5.1 image described in the dockerfile newly The error occurred because the previously pulled ruby 2.5.8 image was used.

I'm not very familiar with docker, but if the ruby image is pulled, will it be used regardless of the ruby version described in the Dockerfile? ??

I didn't understand the difference between docker-compose ʻup, build and start`, so I summarized it

What is a cache? Once you build Docker, a cache is created. As you know, browsers such as Google Chrome have the same function. If you have a cache, you can process it quickly when you build it from the second time onwards.

However, there are times when it is inconvenient to have a cache, such as when updating a Dockerfile. If you don't add the --no-cache option as introduced above, Docker will use the cache to build the image, so you won't see the updated Dockerfile and you won't be able to create a new image.

After all, it seems that a version difference error occurred because the cache when launching the container with the previous ruby 2.5.8 remained.

If you have an old ruby image

Remedy 1

#Docker without using cache-compose.Pull a new image with the ruby version specified by yml

$ docker-compose build --no-cache

Remedy 2

Delete old image

#Show a list of docker images

$ docker images
> REPOSITORY          TAG                   IMAGE ID            CREATED             SIZE
> ruby                2.5.1                 3c8181e703d2        22 months ago       869MB

#Delete image by specifying IMAGE ID

$ docker rmi 3c8181e703d2

that's all

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