我正在尝试像下面这样运行 docker。 但即使我安装了 yarn，它仍然不起作用。运行导轨时出错：yarn not installed。
Dockerfile：
FROM rails:on-build
EXPOSE 3000
CMD [ "rails" , "s" , "-b" , "0.0.0.0" , "-p", "3000" ]
rails/Dockerfile：
FROM ruby:2.6.2
RUN apt-get update -y && apt-get install -y build-essential libpq-dev nodejs sqlite3
ONBUILD COPY app /opt/app
ONBUILD WORKDIR /opt/app
ONBUILD EXPOSE 3000
ONBUILD RUN bundle install
ONBUILD RUN rake db:migrate
ONBUILD RUN rake db:seed
run.sh：
docker-machine create -d virtualbox Char
eval $(docker-machine env Char)
docker build -t rails:on-build . #this runs ok
docker build -t "thisdir:Dockerfile" . #this command triggers the error
错误：
Sending build context to Docker daemon 3.584kB
Step 1/4 : FROM rails:on-build
# Executing 6 build triggers
---> Using cache
---> Running in 7bfd996846cd
create
create README.md
create Rakefile
create .ruby-version
create config.ru
create .gitignore
create Gemfile
run git init from "."
Initialized empty Git repository in /opt/app/.git/
create package.json
create app
create app/assets/config/manifest.js
create app/assets/stylesheets/application.css
create app/channels/application_cable/channel.rb
create app/channels/application_cable/connection.rb
create app/controllers/application_controller.rb
create app/helpers/application_helper.rb
create app/javascript/channels/consumer.js
create app/javascript/channels/index.js
create app/javascript/packs/application.js
create app/jobs/application_job.rb
create app/mailers/application_mailer.rb
create app/models/application_record.rb
create app/views/layouts/application.html.erb
create app/views/layouts/mailer.html.erb
create app/views/layouts/mailer.text.erb
create app/assets/images/.keep
create app/controllers/concerns/.keep
create app/models/concerns/.keep
create bin
create bin/rails
create bin/rake
create bin/setup
create bin/yarn
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/cable.yml
create config/puma.rb
create config/spring.rb
create config/storage.yml
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/application_controller_renderer.rb
create config/initializers/assets.rb
create config/initializers/backtrace_silencers.rb
create config/initializers/content_security_policy.rb
create config/initializers/cookies_serializer.rb
create config/initializers/cors.rb
create config/initializers/filter_parameter_logging.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.rb
create config/initializers/new_framework_defaults_6_0.rb
create config/initializers/wrap_parameters.rb
create config/locales
create config/locales/en.yml
create config/master.key
append .gitignore
create config/boot.rb
create config/database.yml
create db
create db/seeds.rb
create lib
create lib/tasks
create lib/tasks/.keep
create lib/assets
create lib/assets/.keep
create log
create log/.keep
create public
create public/404.html
create public/422.html
create public/500.html
create public/apple-touch-icon-precomposed.png
create public/apple-touch-icon.png
create public/favicon.ico
create public/robots.txt
create tmp
create tmp/.keep
create tmp/pids
create tmp/pids/.keep
create tmp/cache
create tmp/cache/assets
create vendor
create vendor/.keep
create test/fixtures
create test/fixtures/.keep
create test/fixtures/files
create test/fixtures/files/.keep
create test/controllers
create test/controllers/.keep
create test/mailers
create test/mailers/.keep
create test/models
create test/models/.keep
create test/helpers
create test/helpers/.keep
create test/integration
create test/integration/.keep
create test/channels/application_cable/connection_test.rb
create test/test_helper.rb
create test/system
create test/system/.keep
create test/application_system_test_case.rb
create storage
create storage/.keep
create tmp/storage
create tmp/storage/.keep
remove config/initializers/cors.rb
remove config/initializers/new_framework_defaults_6_0.rb
run bundle install
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/............
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Fetching rake 13.0.1
Installing rake 13.0.1
Fetching concurrent-ruby 1.1.5
Installing concurrent-ruby 1.1.5
Fetching i18n 1.7.0
Installing i18n 1.7.0
Fetching minitest 5.13.0
Installing minitest 5.13.0
Fetching thread_safe 0.3.6
Installing thread_safe 0.3.6
Fetching tzinfo 1.2.5
Installing tzinfo 1.2.5
Fetching zeitwerk 2.2.2
Installing zeitwerk 2.2.2
Fetching activesupport 6.0.2.1
Installing activesupport 6.0.2.1
Fetching builder 3.2.4
Installing builder 3.2.4
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Installing erubi 1.9.0
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Installing mini_portile2 2.4.0
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Installing nokogiri 1.10.7 with native extensions
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Installing rails-dom-testing 2.0.3
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Installing crass 1.0.5
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Installing loofah 2.4.0
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Installing rails-html-sanitizer 1.3.0
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Installing actionview 6.0.2.1
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Installing rack 2.0.8
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Installing rack-test 1.1.0
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Installing actionpack 6.0.2.1
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Installing nio4r 2.5.2 with native extensions
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Installing websocket-extensions 0.1.4
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Installing actioncable 6.0.2.1
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Installing globalid 0.4.2
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Fetching mail 2.7.1
Installing mail 2.7.1
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Installing actionmailbox 6.0.2.1
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Installing actiontext 6.0.2.1
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Installing public_suffix 4.0.1
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Installing addressable 2.7.0
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Installing bindex 0.8.1 with native extensions
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Installing bootsnap 1.4.5 with native extensions
Using bundler 2.1.1
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Installing byebug 11.0.1 with native extensions
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Installing regexp_parser 1.6.0
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Installing xpath 3.2.0
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Installing ffi 1.11.3 with native extensions
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Installing jbuilder 2.9.1
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Fetching puma 4.3.1
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Installing thor 1.0.1
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Installing selenium-webdriver 3.142.6
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Installing spring 2.1.0
Fetching spring-watcher-listen 2.0.1
Installing spring-watcher-listen 2.0.1
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Installing sqlite3 1.4.2 with native extensions
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Installing web-console 4.0.1
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Installing webdrivers 4.1.3
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Installing webpacker 4.2.2
Bundle complete! 17 Gemfile dependencies, 75 gems now installed.
Bundled gems are installed into `/usr/local/bundle`
run bundle binstubs bundler
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
run bundle exec spring binstub --all
/usr/local/lib/ruby/2.6.0/bundler/vendor/fileutils/lib/fileutils.rb:1186: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR
/usr/local/bundle/gems/bundler-2.1.1/lib/bundler/vendor/fileutils/lib/fileutils.rb:1284: warning: previous definition of S_IF_DOOR was here
/usr/local/lib/ruby/2.6.0/bundler/vendor/fileutils/lib/fileutils.rb:1444: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM
/usr/local/bundle/gems/bundler-2.1.1/lib/bundler/vendor/fileutils/lib/fileutils.rb:1568: warning: previous definition of DIRECTORY_TERM was here
/usr/local/lib/ruby/2.6.0/bundler/vendor/fileutils/lib/fileutils.rb:1499: warning: already initialized constant Bundler::FileUtils::OPT_TABLE
/usr/local/bundle/gems/bundler-2.1.1/lib/bundler/vendor/fileutils/lib/fileutils.rb:1626: warning: previous definition of OPT_TABLE was here
/usr/local/lib/ruby/2.6.0/bundler/vendor/fileutils/lib/fileutils.rb:1553: warning: already initialized constant Bundler::FileUtils::LOW_METHODS
/usr/local/bundle/gems/bundler-2.1.1/lib/bundler/vendor/fileutils/lib/fileutils.rb:1685: warning: previous definition of LOW_METHODS was here
/usr/local/lib/ruby/2.6.0/bundler/vendor/fileutils/lib/fileutils.rb:1560: warning: already initialized constant Bundler::FileUtils::METHODS
/usr/local/bundle/gems/bundler-2.1.1/lib/bundler/vendor/fileutils/lib/fileutils.rb:1692: warning: previous definition of METHODS was here
bundler: failed to load command: spring (/usr/local/bundle/ruby/2.6.0/bin/spring)
ArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered
/usr/local/lib/ruby/2.6.0/bundler/errors.rb:9:in `status_code'
/usr/local/lib/ruby/2.6.0/bundler/errors.rb:20:in `<class:GemfileError>'
/usr/local/lib/ruby/2.6.0/bundler/errors.rb:20:in `<module:Bundler>'
/usr/local/lib/ruby/2.6.0/bundler/errors.rb:3:in `<top (required)>'
/usr/local/lib/ruby/2.6.0/bundler.rb:10:in `require'
/usr/local/lib/ruby/2.6.0/bundler.rb:10:in `<top (required)>'
/usr/local/bundle/ruby/2.6.0/gems/spring-2.1.0/lib/spring/client/run.rb:3:in `require'
/usr/local/bundle/ruby/2.6.0/gems/spring-2.1.0/lib/spring/client/run.rb:3:in `<top (required)>'
/usr/local/bundle/ruby/2.6.0/gems/spring-2.1.0/lib/spring/client.rb:5:in `require'
/usr/local/bundle/ruby/2.6.0/gems/spring-2.1.0/lib/spring/client.rb:5:in `<top (required)>'
/usr/local/bundle/ruby/2.6.0/gems/spring-2.1.0/bin/spring:48:in `require'
/usr/local/bundle/ruby/2.6.0/gems/spring-2.1.0/bin/spring:48:in `<top (required)>'
/usr/local/bundle/ruby/2.6.0/bin/spring:23:in `load'
/usr/local/bundle/ruby/2.6.0/bin/spring:23:in `<top (required)>'
rails webpacker:install
Yarn not installed. Please download and install Yarn from https://yarnpkg.com/lang/en/docs/install/
The command '/bin/sh -c rails new app' returned a non-zero code: 1
我尝试通过将以下 2 行添加到两个 Dockerfile 的顶部来安装 yarn，但它仍然不起作用，它有相同的错误。
FROM node:6.7.0
RUN npm install -g yarn
用这个更新你的 docker 文件，这将安装最新版本的 nodejs 和 yarn
RUN curl https://deb.nodesource.com/setup_12.x | bash
RUN curl https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-get update && apt-get install -y nodejs yarn
如果单行代码不适合您...
RUN curl https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
您可以将其分为两个步骤
ADD https://dl.yarnpkg.com/debian/pubkey.gpg /tmp/yarn-pubkey.gpg
RUN apt-key add /tmp/yarn-pubkey.gpg && rm /tmp/yarn-pubkey.gpg
尝试通过apt-get install yarn在映像中安装 yarn 并在安装 gem 之前运行yarn install