Konstantin Maksimov kmaksimovv

Использование docker compose с rails + postgresql

Настройка проекта

Прежде чем начать, убедитесь, что у вас установлен docker и docker-compose, если же нет, то используйте ссылки в конце документа.

Для использования docker в своем проекте, первое, что нужно сделать, это добавить Dockerfile. Этот файл описывает процесс сборки контейнера для вашего проекта. В нем указываются настройки сборки и инструкции для установки зависимостей.

Пример такого файла для простого rails-проекта:

#Add sidekiq, sinatra and whenever to the Gemfile

gem 'sidekiq'
gem 'sinatra', require: false
gem "whenever", require: false

Then install the gem

$ bundle install

psql: FATAL: Peer authentication failed for user “postgres” (or any user)

The connection failed because by default psql connects over UNIX sockets using peer authentication, that requires the current UNIX user to have the same user name as psql. So you will have to create the UNIX user postgres and then login as postgres or use sudo -u postgres psql database-name for accessing the database (and psql should not ask for a password).

If you cannot or do not want to create the UNIX user, like if you just want to connect to your database for ad hoc queries, forcing a socket connection using psql --host=localhost --dbname=database-name --username=postgres (as pointed out by @meyerson answer) will solve your immediate problem.

But if you intend to force password authentication over Unix sockets instead of the peer method, try changing the following pg_hba.conf* line:

from

Rails 5 and ActionCable

Assumptions: The application already exists. You have two models article.rb and comment.rb. Articles have two attributes, title and text. Comments have two attributes, text and article_id. See these instructions if you need help getting started.

Routes

Assuming that you are nesting your :comments resources inside of :articles, mount ActionCable and make sure you have a root.

config/routes.rb

Rails.application.routes.draw do

	= simple_form_for [:admin, @course], wrapper: :horizontal_form, html: { class: 'form-horizontal' } do \|f\|
	= f.input :name
	= f.input :description
	= f.association :teacher, label_method: :last_name
	= f.association :disciplines

	.row
	.col-md-11.col-md-offset-3.button_box
	= f.button :submit, 'Сохранить', class: 'btn btn-primary'
	= link_to 'Отменить', admin_courses_path, class: 'btn btn-default'

	# BENCHMARK-----------------------------------------------------

	#1. Rust kafka-benchmark (https://github.com/fede1024/kafka-benchmark)
	# must create topic with 6 partitions first
	bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 6--topic [scenario]
	# replace scenario with one in file kafka-benchmark/config/base_producer.yaml

	FROM ruby:2.3.1

	# Install dependencies
	RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs

	# Set an environment variable where the Rails app is installed to inside of Docker image:
	ENV RAILS_ROOT /var/www/app_name
	RUN mkdir -p $RAILS_ROOT

	# Set working directory, where the commands will be ran:

	// layout file

	<body>
	<div class="container">

	<%= flash_messages %>

	<%= yield %>
	</div><!-- /container -->
	</body>

	namespace :db do

	require 'sequel'
	Sequel.extension(:migration)
	MIGRATIONS_PATH = 'db/migrations'

	def db_conn_env
	ENV["BOOKSHELF_DATABASE_URL"]
	end

	import java.io.IOException;
	import java.util.*;

	import org.apache.hadoop.fs.Path;
	import org.apache.hadoop.conf.*;
	import org.apache.hadoop.io.*;
	import org.apache.hadoop.mapreduce.*;
	import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
	import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
	import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;