Removed old Docker assets examples from the Ruby guide

igor-alexandrov · igor-alexandrov · commit 7b6fa5669089 · 2024-12-23T08:57:43.000+04:00
diff --git a/content/guides/ruby/containerize.md b/content/guides/ruby/containerize.md
@@ -127,15 +127,34 @@ EXPOSE 80
 CMD ["./bin/thrust", "./bin/rails", "server"]
 ```
 
-The Dockerfile above assumes you are using Thruster and Puma as the application server. In case you are using any other server, you can replace the last three lines with the following:
+The Dockerfile above assumes you are using Thruster together with Puma as an application server. In case you are using any other server, you can replace the last three lines with the following:
 
 ```dockerfile
 # Start the application server
 EXPOSE 3000
 CMD ["./bin/rails", "server"]
 ```
 
-Besides the Dockerfile you will also need a `.dockerignore` file. This file is used to exclude files and directories from the context of the build. Below is an example of a `.dockerignore` file.
+We specified the Docker entrypoint as `./bin/docker-entrypoint` which is a script that prepares the database and runs the application server. Below is an example of such a script.
+
+```bash {title=docker-entrypoint}
+#!/bin/bash -e
+
+# Enable jemalloc for reduced memory usage and latency.
+if [ -z "${LD_PRELOAD+x}" ]; then
+    LD_PRELOAD=$(find /usr/lib -name libjemalloc.so.2 -print -quit)
+    export LD_PRELOAD
+fi
+
+# If running the rails server then create or migrate existing database
+if [ "${@: -2:1}" == "./bin/rails" ] && [ "${@: -1:1}" == "server" ]; then
+  ./bin/rails db:prepare
+fi
+
+exec "${@}"
+```
+
+Besides the two files above you will also need a `.dockerignore` file. This file is used to exclude files and directories from the context of the build. Below is an example of a `.dockerignore` file.
 
 ```text {collapse=true,title=".dockerignore"}
 # See https://docs.docker.com/engine/reference/builder/#dockerignore-file for more about ignoring files.
@@ -199,308 +218,6 @@ services:
       - "3000:80"
 ```
 
-
-Now that you have an application, you can create the necessary Docker assets to
-containerize your application. You can use Docker Desktop's built-in Docker Init
-feature to help streamline the process, or you can manually create the assets.
-
-`docker init`, the command for bootstrapping the Docker-related assets for a project, does not yet support the Ruby programming language. This means that if you are working with Ruby, you'll need to create Dockerfiles and other related configurations manually.
-
-Inside the `docker-ruby-on-rails` directory, create the following files:
-
-Create a file named `Dockerfile` with the following contents.
-
-```dockerfile {collapse=true,title=Dockerfile}
-# syntax=docker/dockerfile:1
-
-# Use the official Ruby image with version 3.2.0
-FROM ruby:3.2.0
-
-# Install dependencies
-RUN apt-get update -qq && apt-get install -y \
-  nodejs \
-  postgresql-client \
-  libssl-dev \
-  libreadline-dev \
-  zlib1g-dev \
-  build-essential \
-  curl
-
-# Install rbenv
-RUN git clone https://github.com/rbenv/rbenv.git ~/.rbenv && \
-  echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc && \
-  echo 'eval "$(rbenv init -)"' >> ~/.bashrc && \
-  git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build && \
-  echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
-
-# Install the specified Ruby version using rbenv
-ENV PATH="/root/.rbenv/bin:/root/.rbenv/shims:$PATH"
-RUN rbenv install 3.2.0 && rbenv global 3.2.0
-
-# Set the working directory
-WORKDIR /myapp
-
-# Copy the Gemfile and Gemfile.lock
-COPY Gemfile /myapp/Gemfile
-COPY Gemfile.lock /myapp/Gemfile.lock
-
-# Install Gems dependencies
-RUN gem install bundler && bundle install
-
-# Copy the application code
-COPY . /myapp
-
-# Precompile assets (optional, if using Rails with assets)
-RUN bundle exec rake assets:precompile
-
-# Expose the port the app runs on
-EXPOSE 3000
-
-# Command to run the server
-CMD ["rails", "server", "-b", "0.0.0.0"]
-```
-
-Create a file named `compose.yaml` with the following contents.
-
-```yaml {collapse=true,title=compose.yaml}
-services:
-  web:
-    build: .
-    command: bundle exec rails s -b '0.0.0.0'
-    volumes:
-      - .:/myapp
-    ports:
-      - "3000:3000"
-```
-
-Create a file named `.dockerignore` with the following contents.
-
-```text {collapse=true,title=".dockerignore"}
-git
-.gitignore
-
-# Created by https://www.gitignore.io/api/git,ruby,rails,jetbrains+all
-# Edit at https://www.gitignore.io/?templates=git,ruby,rails,jetbrains+all
-
-### Git ###
-# Created by git for backups. To disable backups in Git:
-# $ git config --global mergetool.keepBackup false
-*.orig
-
-# Created by git when using merge tools for conflicts
-*.BACKUP.*
-*.BASE.*
-*.LOCAL.*
-*.REMOTE.*
-*_BACKUP_*.txt
-*_BASE_*.txt
-*_LOCAL_*.txt
-*_REMOTE_*.txt
-
-### JetBrains+all ###
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
-# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
-
-# User-specific stuff
-.idea/**/workspace.xml
-.idea/**/tasks.xml
-.idea/**/usage.statistics.xml
-.idea/**/dictionaries
-.idea/**/shelf
-
-# Generated files
-.idea/**/contentModel.xml
-
-# Sensitive or high-churn files
-.idea/**/dataSources/
-.idea/**/dataSources.ids
-.idea/**/dataSources.local.xml
-.idea/**/sqlDataSources.xml
-.idea/**/dynamic.xml
-.idea/**/uiDesigner.xml
-.idea/**/dbnavigator.xml
-
-# Gradle
-.idea/**/gradle.xml
-.idea/**/libraries
-
-# Gradle and Maven with auto-import
-# When using Gradle or Maven with auto-import, you should exclude module files,
-# since they will be recreated, and may cause churn.  Uncomment if using
-# auto-import.
-# .idea/modules.xml
-# .idea/*.iml
-# .idea/modules
-# *.iml
-# *.ipr
-
-# CMake
-cmake-build-*/
-
-# Mongo Explorer plugin
-.idea/**/mongoSettings.xml
-
-# File-based project format
-*.iws
-
-# IntelliJ
-out/
-
-# mpeltonen/sbt-idea plugin
-.idea_modules/
-
-# JIRA plugin
-atlassian-ide-plugin.xml
-
-# Cursive Clojure plugin
-.idea/replstate.xml
-
-# Crashlytics plugin (for Android Studio and IntelliJ)
-com_crashlytics_export_strings.xml
-crashlytics.properties
-crashlytics-build.properties
-fabric.properties
-
-# Editor-based Rest Client
-.idea/httpRequests
-
-# Android studio 3.1+ serialized cache file
-.idea/caches/build_file_checksums.ser
-
-### JetBrains+all Patch ###
-# Ignores the whole .idea folder and all .iml files
-# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
-
-.idea/
-
-# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
-
-*.iml
-modules.xml
-.idea/misc.xml
-*.ipr
-
-# Sonarlint plugin
-.idea/sonarlint
-
-### Rails ###
-*.rbc
-capybara-*.html
-.rspec
-/db/*.sqlite3
-/db/*.sqlite3-journal
-/public/system
-/coverage/
-/spec/tmp
-rerun.txt
-pickle-email-*.html
-
-# Ignore all logfiles and tempfiles.
-/log/*
-/tmp/*
-!/log/.keep
-!/tmp/.keep
-
-# TODO Comment out this rule if you are OK with secrets being uploaded to the repo
-config/initializers/secret_token.rb
-config/master.key
-
-# Only include if you have production secrets in this file, which is no longer a Rails default
-# config/secrets.yml
-
-# dotenv
-# TODO Comment out this rule if environment variables can be committed
-.env
-
-## Environment normalization:
-/.bundle
-/vendor/bundle
-
-# these should all be checked in to normalize the environment:
-# Gemfile.lock, .ruby-version, .ruby-gemset
-
-# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
-.rvmrc
-
-# if using bower-rails ignore default bower_components path bower.json files
-/vendor/assets/bower_components
-*.bowerrc
-bower.json
-
-# Ignore pow environment settings
-.powenv
-
-# Ignore Byebug command history file.
-.byebug_history
-
-# Ignore node_modules
-node_modules/
-
-# Ignore precompiled javascript packs
-/public/packs
-/public/packs-test
-/public/assets
-
-# Ignore yarn files
-/yarn-error.log
-yarn-debug.log*
-.yarn-integrity
-
-# Ignore uploaded files in development
-/storage/*
-!/storage/.keep
-
-### Ruby ###
-*.gem
-/.config
-/InstalledFiles
-/pkg/
-/spec/reports/
-/spec/examples.txt
-/test/tmp/
-/test/version_tmp/
-/tmp/
-
-# Used by dotenv library to load environment variables.
-# .env
-
-# Ignore Byebug command history file.
-
-## Specific to RubyMotion:
-.dat*
-.repl_history
-build/
-*.bridgesupport
-build-iPhoneOS/
-build-iPhoneSimulator/
-
-## Specific to RubyMotion (use of CocoaPods):
-#
-# We recommend against adding the Pods directory to your .gitignore. However
-# you should judge for yourself, the pros and cons are mentioned at:
-# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
-# vendor/Pods/
-
-## Documentation cache and generated files:
-/.yardoc/
-/_yardoc/
-/doc/
-/rdoc/
-
-/.bundle/
-/lib/bundler/man/
-
-# for a library or gem, you might want to ignore these files since the code is
-# intended to run in multiple environments; otherwise, check them in:
-# Gemfile.lock
-# .ruby-version
-# .ruby-gemset
-
-# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
-
-# End of https://www.gitignore.io/api/git,ruby,rails,jetbrains+all
-```
-
 You should now have the following three files in your `docker-ruby-on-rails`
 directory.
 
