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RUN apt update
RUN apt upgrade -y
RUN apt install -y apt-utils
RUN a2enmod rewrite
RUN apt install -y libmcrypt-dev
RUN docker-php-ext-install mcrypt
RUN apt install -y libicu-dev
RUN docker-php-ext-install -j$(nproc) intl
RUN apt-get install -y libfreetype6-dev libjpeg62-turbo-dev libpng12-dev

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FROM alpine:3.4

##################### Base dependencies #################################
RUN apk --no-cache add ruby ruby-irb ruby-json  git ruby-bigdecimal ruby-rake \
    ruby-io-console ruby-bundler libstdc++ tzdata postgresql-client nodejs \
    libxml2 libxslt libgcrypt sqlite-libs pcre curl postgresql bash procps openssh \
    && cp /usr/bin/pg_dump /usr/bin/pg_restore /tmp/ \
    && apk del --purge postgresql \
    && mv /tmp/pg_dump /tmp/pg_restore /usr/bin/ \
    && echo "gem: --no-document" > /etc/gemrc

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FROM alpine:3.4

##################### Base dependencies #################################
RUN apk --no-cache add ruby ruby-irb ruby-json  git ruby-bigdecimal ruby-rake \
    ruby-io-console ruby-bundler libstdc++ tzdata postgresql-client nodejs \
    libxml2 libxslt libgcrypt sqlite-libs pcre curl postgresql bash procps openssh \
    && cp /usr/bin/pg_dump /usr/bin/pg_restore /tmp/ \
    && apk del --purge postgresql \
    && mv /tmp/pg_dump /tmp/pg_restore /usr/bin/ \
    && echo "gem: --no-document" > /etc/gemrc

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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:

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

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# nil? can be used on any Ruby object. It returns true only if the object is nil.
nil.nil?   # => true 
[].nil?    # => false 
{}.nil?    # => false
"".nil?    # => false
" ".nil?   # => false
true.nil?  # => false

# empty? can be used on some Ruby objects including Arrays, Hashes and Strings. It returns true only if the object's length is zero.
nil.empty?   # NoMethodError: undefined method `empty?' for nil:NilClass

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Laravel's Dependency Injection Container in Depth

Translations: Korean (by Yongwoo Lee)

Laravel has a powerful Inversion of Control (IoC) / Dependency Injection (DI) Container. Unfortunately the official documentation doesn't cover all of the available functionality, so I decided to experiment with it and document it for myself. The following is based on Laravel 5.4.26 - other versions may vary.

Introduction to Dependency Injection

I won't attempt to explain the principles behind DI / IoC here - if you're not familiar with them you might want to read What is Dependency Injection? by Fabien Potencier (creator of the Symfony framework).

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#!/bin/bash

# Install dependencies
# older ubuntus
#apt-get install build-essential libsqlite3-dev ruby1.9.1-dev
# xenial
apt install build-essential libsqlite3-dev ruby-dev

# Install the gem
gem install mailcatcher --no-ri --no-rdoc

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## How to install mcrypt in php7.2
##
## https://lukasmestan.com/install-mcrypt-extension-in-php7-2/
##


# 
# Check version php and pecl
# 
php -v # if default php is not 7.2 then use /usr/bin/php7.2 instead php

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# check if there is a file named maintenance.html
# so when you want to disable maintenance mode just remname "mv maintenance.html maintenance.html.disabled"
RewriteCond %{DOCUMENT_ROOT}/maintenance.html -f
RewriteCond %{SCRIPT_FILENAME} !maintenance.html
RewriteRule ^.*$ /maintenance.html [R=503,L]
ErrorDocument 503 /maintenance.html