YAML Loader - Ruby

Sample YAML Loader:

Assume your yaml file 'email_credential.yml' exists in same directory and in the format below:

email:

  smtp_server: smtp.gmail.com

  smtp_port: 587

Here is the simple snippet to load YAML and collect data:

begin

  yml = YAML.load_file("email_credentials.yml")

  

  email = yml['email']['smtp_server']

  eport = yml['email']['smtp_port']

  

rescue Exception => e

  puts "Email credential YAML loading issue \n" + e.to_s

end

Website Monitor - Ruby Script

Simple Ruby Script file to check the web site and post an email using gmail service.

This script contains 2 main parts

1. Checking website - for response OK and content
2. Email to admin on failure [using gmail]

Checking Website:

    url = URI.parse(web_url)

  net_conn = Net::HTTP.new(url.host, url.port)

  net_conn.use_ssl = url.scheme == "https"

  res = net_conn.get('/')

   We can check res.code == 200 and verify res.body includes the content we wanted to see.

Email [Using gmail]

  NOTE: Gmail needs TLS encryption; so enable it before start sending msg

   

    smtp = Net::SMTP.new("smtp.gmail.com", 587)

    smtp.enable_starttls #gmail needs this encryption

    smtp.start("DOMAIN_FILLER", <gmail_acc>, <gmail_pwd>, :login)  do |s| 

      s.send_message(<msg>, <gmail_acc>, <to>)

    end  

  Sample GMAIL Msg format:

   msg = [

    "From: WebMonitor <from_addr>",

    "To: Admin <to_addr>",

    "Subject: <subject>",

    "",

    "Hi,",

    "!!MORE DETAILED MSG!!"

  ].join("\r\n");

Gist: https://gist.github.com/sivajankan/8278d75c39bc5a8260ae

The script can be added to crontab to do automated testing

Selenium - IE remote browser setup

Setup Selenium -  IE remote browser

1. Install Java. If you are setting up from a base level testing VM, you may need to first install Java.
2. Download following files from https://code.google.com/p/selenium/downloads/list into your windows machine (This page mostly has latest versions. Pick them)
• a. selenium-server-standalone-2.39.0.jar
• b. IEDriverServer _Win32_2.39.0.zip (There is version for 64 bit; pick appropriate version)
3. Place the jar file and extracted exe file from zip, into C:\SeleniumServer folder
4. In Command Prompt and navigate to 'C:\SeleniumServer'
5. Run the command to start the standalone selenium server

java -jar selenium-server-standalone-2.35.0.jar -Djava.util.logging.Level=OFF -Dwebdriver.ie.driver="C:\SeleniumServer\IEDriverServer.exe"

Cap Deploy [Capistrano]

Capistrano

Ref:
http://capistranorb.com/
https://github.com/capistrano/ # Shows list of all capistrano repos
https://github.com/capistrano/capistrano
https://github.com/capistrano/rails
https://github.com/capistrano/passenger

Gemfile

gem 'capistrano'

gem 'capistrano-rails'

gem 'capistrano-passenger'

gem 'capistrano-rvm'  #if your preference is RVM

$> bundle install
$> bundle exec cap install #Make sure files are created
$> bundle exec cap install STAGES=production  #add additional env seperated by ','

Limited gem installation [selected env]
$> bundle install --without development test

Capfile

require 'capistrano/rails'

#or

require 'capistrano/rvm'

require 'capistrano/bundler'

require 'capistrano/rails/assets'

require 'capistrano/rails/migrations'

require 'capistrano/passenger'

#For rbenv

require 'capistrano/rbenv'

require 'capistrano/chruby'

Ref: http://capistranorb.com/documentation/getting-started/configuration/

config/deploy.rb

set :application, '<app_name>'

set :repo_url, 'git@.... <git repo>'

set :linked_files, fetch(:linked_files, []).push('config/database.yml')

set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bundle', 'public/system')

set :keep_releases, 5

config/deploy/production.rb

server '<dest_server>', user: '<dest_server_user>', roles: %w{web db app}

set :deploy_to, "/var/www/html/<dir>"

set :passenger_restart_command, 'passenger-config restart-app'

set :passenger_restart_options, -> { "#{deploy_to} --ignore-app-not-running" }

Adding tasks

Ref: http://capistranorb.com/documentation/getting-started/cold-start/

in create lib/capistrano/tasks/access_check.rake file, and add

  namespace :check do

    desc "Check that we can access everything"

    task :write_permissions do

      on roles(:all) do |host|

        if test("[ -w #{fetch(:deploy_to)} ]")

          info "#{fetch(:deploy_to)} is writable on #{host}"

        else

          error "#{fetch(:deploy_to)} is not writable on #{host}"

        end

      end

    end

  end

$> bundle exec cap -T #to check the task existence
$> bundle exec cap production check:write_permissions #to verify the write permission


[Still working on Cap Scripting]

Basic Commands

cap production deploy:check

cap production deploy 

cap production deploy:rollback

Advance Comments [from capistrano Git page]

# list all available tasks
$ bundle exec cap -T

# deploy to the staging environment
$ bundle exec cap staging deploy

# deploy to the production environment
$ bundle exec cap production deploy

# simulate deploying to the production environment
# does not actually do anything
$ bundle exec cap production deploy --dry-run

# list task dependencies
$ bundle exec cap production deploy --prereqs

# trace through task invocations

$ bundle exec cap production deploy --trace

Advance Learning

https://github.com/capistrano/sshkit

Deploy issue with git

When you get: git stdout: permission denied (publickey).

$> eval $(ssh-agent)

$> ssh-add

Rails Life

Ruby Self Help Steps

Installation required Ruby setups!

http://code.tutsplus.com/tutorials/how-to-install-ruby-on-a-mac--net-21664
https://gorails.com/setup/osx/10.10-yosemite
http://railsapps.github.io/installrubyonrails-mac.html

Xcode installation if mac
RVM installation
Ruby installation
git installation
PostgreSQL or SQLite3


RVM Ruby version Preparation

rvm current #shows current default
rvm list #lists local installation

rvm get stable #get latest stable version
rvm reload # reload rvm
rvm list remote #all available to install
rvm install 2.2.5
rvm reinstall 2.2.0 --disable-binary

rvm --default use 2.1.5 #to make 2.1.5 as default

gem setup
$ echo 'gem: --no-document' >> ~/.gemrc

To create gemset
$ rvm use 2.2.1@gemset-2.2.1 --create

Install rails before the next step
$ gem install rails

Good start for first project
Ref: https://github.com/RailsApps/rails-composer/

#sudo gem install rails

rails new myapp -m https://raw.github.com/RailsApps/rails-composer/master/composer.rb

#Standard way
$rails new <project_name>

use .ruby-version  file to specify ruby version for the project
Example: 2.2.1@gemset_2_2_1

rspec

https://relishapp.com/rspec/rspec-rails/docs/gettingstarted

in Gemfile, development and test section
gem "rspec-rails"

bundle install
rails generate rspec:install

Remember: rake db:test:prepare

rake spec #to run tests


Cucumber

in Gemfile - development 

gem 'cucumber-rails', :require => false

gem 'database_cleaner'

  

bundle install
rails generate cucumber:install


Haml

add
gem "haml-rails", "~> 0.9" #Check version from https://github.com/indirect/haml-rails

rails generate haml:application_layout convert

rake haml:erb2haml # to convert existing erb files to haml

Devise Add gem "devise" in Gemfile 
bundle install

rails generate devise:install

Follow suggestions


Registeration Email issue

Google account access blocking

SMTPAuthenticationError

http://stackoverflow.com/questions/18124878/netsmtpauthenticationerror-when-sending-email-from-rails-app-on-staging-envir

Add gem 'sass-rails' in Gemfile





Pry
http://pryrepl.org/

pry -r ./config/environment.rb

Passenger for Rails : CentOS

System Info

CentOS Linux release 7.0.1406 (Core) 

3.7GB Memory 

50GB diskspace

DUAL Core - Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz

X86_64 - Architecture

Ref: 

https://www.digitalocean.com/community/tutorials/how-to-use-capistrano-to-automate-deployments-getting-started

https://www.digitalocean.com/community/tutorials/how-to-setup-a-rails-4-app-with-apache-and-passenger-on-centos-6

Root access:

yum -y update

yum groupinstall -y 'development tools'

curl -L get.rvm.io | bash -s stable  

  -- didnt work; and suggested next step in error

  >gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

curl -L get.rvm.io | bash -s stable

source /etc/profile.d/rvm.sh 

rvm reload

rvm get stable

rvm requirements

rvm reload

rvm install 2.1 #installed 2.1.5p273

rvm --default use 2.1.5

CONTINUE
https://www.rosehosting.com/blog/install-ruby-on-rails-with-apache-and-passenger-on-centos-6/

install rvm for newuser

adduser newuser

passwd newuser 

usermod -G wheel newuser #pick a fair name for new user

visudo #uncomment next line

  #%wheel ALL=(ALL) NOPASSWD:ALL

vim /etc/ssh/sshd_config #add next line to avoid ssh access using new user name

  DenyUsers newuser

service sshd restart

su - newuser

sudo yum -y update

sudo yum -y install curl curl-devel httpd-devel httpd mod_ssl

sudo curl -L get.rvm.io | bash -s stable  

  gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

#then sudo curl -L get.rvm.io | bash -s stable  

rvm get stable

rvm reload

rvm install 2.1.5

rvm use 2.1.5 --default

vim ~/.gemrc #put following lines to avoid lot of ri doc installations

---

:backtrace: false

:benchmark: false

:bulk_threshold: 1000

:sources:

- http://rubygems.org/

- http://gemcutter.org

:update_sources: true

:verbose: true

gem:

  --no-document

  --no-ri

  --no-rdoc

gem install rails

gem install passenger

passenger-install-apache2-module #follow the suggestions

PostgreSQL Installation

CentOS

#Postgres installation

ref: https://wiki.postgresql.org/wiki/YUM_Installation

ref2: http://karolgalanciak.com/blog/2013/07/19/centos-6-4-server-setup-with-ruby-on-rails-nginx-and-postgresql/

#as root

vim /etc/yum.repos.d/CentOS-Base.repo

 #add following line into [base] and [updates] section

 exclude=postgresql*

yum localinstall http://yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-centos94-9.4-1.noarch.rpm

yum install postgresql94-server

yum install postgresql94 postgresql94-devel postgresql94-server postgresql94-libs postgresql94-contrib

Installation is complete: next setup

/usr/pgsql-9.4/bin/postgresql94-setup initdb

  #service postgresql-9.4 init db - failed

  #systemctl initdb postgresql-9.4.service - didnt work

chkconfig postgresql-9.4 on #postgres start on startup

#CONFIG 

vi /var/lib/pgsql/9.3/data/pg_hba.conf

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only

local   all             all                                     md5

# IPv4 local connections:

host    all             all             127.0.0.1/32            md5

# IPv6 local connections:

host    all             all             ::1/128                 md5

service postgresql-9.4 restart

#db setup

https://wiki.postgresql.org/wiki/First_steps

$>su - postgres

$>psql

psql>alter user postgres with password 'postgres-user-password';

psql>ctrl+d

exit

$> su - newuser #user in rails installation

$> psql postgres -U postgres #postgres password from previous step

psql>create user username with password 'secretPassword'; #username - new db account user

psql>create database testdb owner=username;

To delete postgres:

yum erase postgresql94*