gem 'aws-sdk-cloudwatch'

# config/initializers/cloudwatch_puma_metrics.rb
require 'aws-sdk-cloudwatch'
require 'net/http'
require 'json'

CLOUDWATCH = Aws::CloudWatch::Client.new(region: 'ap-northeast-1')


Thread.new do
  loop do
    begin
      sleep 10
      Rails.logger.info("Sending Puma metrics to CloudWatch")
      uri = URI('http://127.0.0.1:9293/stats')
      res = Net::HTTP.start(uri.host, uri.port, open_timeout: 1, read_timeout: 1) do |http|
        http.get(uri.request_uri)
      end

      stats = JSON.parse(res.body)
      Rails.logger.info(stats.inspect)
      capacity = stats['pool_capacity']

      CLOUDWATCH.put_metric_data(
        namespace: 'Custom/Puma',
        metric_data: [
          {
            metric_name: 'ThreadPoolCapacity',
            value: capacity,
            unit: 'Count',
            storage_resolution: 1,
            dimensions: [
              { name: 'Cluster', value: ENV['ECS_CLUSTER'] || 'default' },
              { name: 'Service', value: ENV['ECS_SERVICE_NAME'] || 'rails' }
            ]
          }
        ]
      )
     
    rescue => e
      Rails.logger.error("CloudWatch Puma metric error: #{e.class}: #{e.message}")
    end
  end
end

class RequestCounter
  def initialize(app)
    @app = app
  end

  def call(env)
    REQUEST_COUNTER.increment
    @app.call(env)
  end
end

activate_control_app 'tcp://127.0.0.1:9293', { no_token: true }

aws configure

aws ecr get-login-password --region ap-northeast-1 | docker login --username AWS --password-stdin {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com

aws ecr create-repository \
        --repository-name rails \
        --image-scanning-configuration scanOnPush=true \
        --region ap-northeast-1

docker tag rails-demo:latest {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com/rails:latest

docker push {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com/rails:latest

docker build -t rails-demo .

docker run -d -p 3000:3000 \
  -e RAILS_MASTER_KEY=$(cat config/master.key) \
  --name my-app \
  rails-demo

＜コンテナID確認＞
docker ps -a
＜コンテナにbashではいる＞
docker exec -it {コンテナID} /bin/bash

bundle exec rails c
helper.asset_url("100KB.png")

brew install jmeter

jmeter

Thread Group
  Number of Threads:50
  Ramp-up:60
  Duration:300

以下の設定で3000アクセスに設定します。1分で3000アクセスなので、秒間50アクセスです。

Constant Throughput Timer
 Target throughput:3000

以下の設定で画像にアクセスするようにします。

HTTP Request
  protocol:https
  Server Name or ip:ECSのドメイン
  Path:{helper.asset_url("100KB.png")の結果}

確認結果

秒間50アクセスを5分間継続したところ、CPU使用率は14%程度になりました。

サーバはECS Fargateで、1vCPU/2GBです。

sudo gem install rails

rails new my-app
cd my-app

rails -v
Rails 8.1.1

# syntax=docker/dockerfile:1
# check=error=true

# This Dockerfile is designed for production, not development. Use with Kamal or build'n'run by hand:
# docker build -t my_app .
# docker run -d -p 80:80 -e RAILS_MASTER_KEY= --name my_app my_app

# For a containerized dev environment, see Dev Containers: https://guides.rubyonrails.org/getting_started_with_devcontainer.html

# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
ARG RUBY_VERSION=3.4.2
FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base

# Rails app lives here
WORKDIR /rails

# Install base packages
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y curl libjemalloc2 libvips sqlite3 && \
    ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Set production environment variables and enable jemalloc for reduced memory usage and latency.
ENV RAILS_ENV="production" \
    BUNDLE_DEPLOYMENT="1" \
    BUNDLE_PATH="/usr/local/bundle" \
    BUNDLE_WITHOUT="development" \
    LD_PRELOAD="/usr/local/lib/libjemalloc.so"

# Throw-away build stage to reduce size of final image
FROM base AS build

# Install packages needed to build gems
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y build-essential git libyaml-dev pkg-config && \
    rm -rf /var/lib/apt/lists /var/cache/apt/archives

# Install application gems
COPY Gemfile Gemfile.lock vendor ./

RUN bundle install && \
    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
    # -j 1 disable parallel compilation to avoid a QEMU bug: https://github.com/rails/bootsnap/issues/495
    bundle exec bootsnap precompile -j 1 --gemfile

# Copy application code
COPY . .

# Precompile bootsnap code for faster boot times.
# -j 1 disable parallel compilation to avoid a QEMU bug: https://github.com/rails/bootsnap/issues/495
RUN bundle exec bootsnap precompile -j 1 app/ lib/

# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile




# Final stage for app image
FROM base

# Run and own only the runtime files as a non-root user for security
RUN groupadd --system --gid 1000 rails && \
    useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash
USER 1000:1000

# Copy built artifacts: gems, application
COPY --chown=rails:rails --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
COPY --chown=rails:rails --from=build /rails /rails

# Entrypoint prepares the database.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]

# Start server via Thruster by default, this can be overwritten at runtime
EXPOSE 80
CMD ["./bin/thrust", "./bin/rails", "server"]

「ENV RAILS_ENV="production"」をコメントアウトして、「ENV RAILS_ENV=development」を追記します。
#ENV RAILS_ENV="production" \
ENV RAILS_ENV=development\

以下のようにENTRYPOINTをコメントアウト
#ENTRYPOINT ["/rails/bin/docker-entrypoint"]

以下のようにEXPOSEとCMDを変更
#EXPOSE 80
#CMD ["./bin/thrust", "./bin/rails", "server"]

EXPOSE 3000
CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"]

docker build -t rails-demo .

docker run -d -p 3000:3000 \
  -e RAILS_MASTER_KEY=$(cat config/master.key) \
  --name my-app \
  rails-demo

aws configure

aws ecr get-login-password --region ap-northeast-1 | docker login --username AWS --password-stdin {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com

aws ecr create-repository \
        --repository-name rails \
        --image-scanning-configuration scanOnPush=true \
        --region ap-northeast-1

docker tag rails-demo:latest {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com/rails:latest

docker push {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com/rails:latest

rails new test_app

cd test_app/

rails -v

Rails 7.1.3.3

vi Gemfile

#gem "rails", "~> 7.1.3", ">= 7.1.3.3"     #コメントアウト

gem "rails", github: "rails/rails", branch: "7-2-stable"     #これを追加

bundle install

rails server

rails new test_app

cd test_app/

vi Dockerfile

<変更①>「ENV RAILS_ENV="production"」をコメントアウトして、「ENV RAILS_ENV=$ENVIROMENTS」を追記します。
#ENV RAILS_ENV="production" \
ENV RAILS_ENV=$ENVIROMENTS \
<変更②>
5行目のFORMの後に以下を追加
ARG ENVIROMENTS

docker build . -t test_app --build-arg ENVIROMENTS='development'

docker run -it -p 3000:3000 --env RAILS_MASTER_KEY=`cat config/master.key` test_app bin/rails server -b 0.0.0.0

aws configure

aws ecr get-login-password --region ap-northeast-1 | docker login --username AWS --password-stdin {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com

aws ecr create-repository \
        --repository-name rails \
        --image-scanning-configuration scanOnPush=true \
        --region ap-northeast-1 

docker tag test_app:latest {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com/rails:latest

docker push {AWSアカウントID}.dkr.ecr.ap-northeast-1.amazonaws.com/rails:latest

brew install rbenv

rbenv install -l

rbenv install 3.3.1
rbenv global 3.3.1

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
source ~/.zprofile

sudo gem install rails

rails --version

Rails 7.1.3.3

rails new test_app

cd test_app/

bin/rails server

vi Dockerfile

<変更①>「ENV RAILS_ENV="production"」をコメントアウトして、「ENV RAILS_ENV=$ENVIROMENTS」を追記します。
#ENV RAILS_ENV="production" \
ENV RAILS_ENV=$ENVIROMENTS \
<変更②>
5行目のFORMの後に以下を追加
ARG ENVIROMENTS

docker build . -t test_app --build-arg ENVIROMENTS='development'

docker run -it -p 3000:3000 --env RAILS_MASTER_KEY=`cat config/master.key` test_app bin/rails server -b 0.0.0.0

rails new . --force --database=mysql

vi Dockerfile

<変更①>「ENV RAILS_ENV="production"」をコメントアウトして、「ENV RAILS_ENV=$ENVIROMENTS」を追記します。
#ENV RAILS_ENV="production" \
ENV RAILS_ENV=$ENVIROMENTS \
<変更②>
5行目のFORMの後に以下を追加
ARG ENVIROMENTS

vi docker-compose.yml

version: "3"
services:
  app:
    container_name: app_rails
    build:
      args:
        ENVIROMENTS: development
        RAILS_MASTER_KEY: 'cat config/master.key'
    command: bin/rails server -b 0.0.0.0
    volumes:
      - .:/rails
    ports:
      - 80:3000
    tty: true
    stdin_open: true
    depends_on:
      - db
  db:
    image: mysql:8.0.28
    container_name: db
    environment: 
      MYSQL_ROOT_PASSWORD: password
    command: mysqld --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
    volumes:  
      - ./docker/db/data:/var/lib/mysql
    ports:
      - 3306:3306
  phpmyadmin:
    container_name: test_phpmyadmin
    image: phpmyadmin
    environment:
    - PMA_USER=root
    - PMA_PASSWORD=password
    ports:
    - 8080:80
    depends_on:
      - db

vi config/database.yml

default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: password
  host: db

development:
  <<: *default
  database: test4_development

docker compose up

docker-compose run app bin/rails db:create

docker compose exec app bash

cat /etc/os-release

PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

NoMethodError: undefined method `table_name' for

  def self.ransackable_attributes(auth_object = nil)
    # 全ての列を検索可能にする
    authorizable_ransackable_attributes
  end
  def self.ransackable_associations(auth_object = nil)
    # 全ての関連テーブルを検索可能にする
    authorizable_ransackable_associations
  end