Alex Leasenco alexandrule

Deploy Rails Application to AWS EC2

Creating AWS EC2 Instance

- login to 'AWS Management Console' (https://aws.amazon.com/console/)
- from 'Services'(in navbar) choose 'EC2'
- from 'Create Instance' section, click on 'Launch Instance'
- then select 'AMI' (Amazon Machine Image), we will be using 'Ubuntu Server 16.04 LTS (HVM)' as example
- select 'Instance Type' as per your requirement
- then click 'Next:Configure Instance Details' to continue
  change 'Configure Instance Details' or used as default settings

How to Run a Process in the Background with TMUX

There are times when you need to log off your Linux Desktop, and you want a process to run in the background. TMUX manages this very well.

For this example, let's suppose you're running a long running task like running rspecs on your project and it is 5pm, and you need to go home.

Run Your Process

Installing `pg` gem on macOS

If you're trying to install the postgresql gem pg and it is failing with the following error message:

Installing pg 1.2.3 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: ~/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/pg-1.2.3/ext
~/.rbenv/versions/3.0.0/bin/ruby -I ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0 -r ./siteconf20210125-97201-pycpo.rb extconf.rb

Based on this blogpost.

Install with Homebrew:

$ brew install postgresql@14

(The version number 14 needs to be explicitly stated. The @ mark designates a version number is specified. If you need an older version of postgres, use postgresql@13, for example.)

JWT Auth + Refresh Tokens in Rails

This is just some code I recently used in my development application in order to add token-based authentication for my api-only rails app. The api-client was to be consumed by a mobile application, so I needed an authentication solution that would keep the user logged in indefinetly and the only way to do this was either using refresh tokens or sliding sessions.

I also needed a way to both blacklist and whitelist tokens based on a unique identifier (jti)

Before trying it out DIY, I considered using:

	.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

	FROM ruby:2.6.5-alpine

	RUN apk add --update --no-cache bash build-base nodejs sqlite-dev tzdata postgresql-dev yarn

	RUN gem install bundler:2.1.4

	WORKDIR /usr/src/app

	COPY package.json yarn.lock ./
	RUN yarn install --check-files

	Africa/Abidjan
	Africa/Accra
	Africa/Addis_Ababa
	Africa/Algiers
	Africa/Asmara
	Africa/Asmera
	Africa/Bamako
	Africa/Bangui
	Africa/Banjul
	Africa/Bissau

	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:

	# /etc/systemd/system/foo.service
	[Unit]
	Description=Foo service
	Wants=nginx.service
	Requires=postgresql.service
	After=postgresql.service

	[Service]
	Type=simple
	User=foo