VimleshS

Patterns of Enterprise Application Architecture

By Martin Fowler (2002)

Chapter 1: Layering

A basic example of layering: FTP < TCP < IP < Ethernet

Benefis of layering:

• You can understand a layer without knowing much about the others.
• Minimize dependencies.

VimleshS

#Reference
#https://devnotcorp.wordpress.com/2012/08/21/usage-examples-of-rubys-openssl-lib/



#!/usr/bin/ruby
require 'openssl'
require 'date'
require 'time'
 

VimleshS

In this article, I'll walk through a basic Rails (3.2.x) setup for creating a nested resource for two models. Nested resources work well when you want to build out URL structure between two related models, and still maintain a RESTful convention. This code assumes you are running RVM to manage Ruby/Gem versions, and Git for version control.

Creating a new Rails project

$ mkdir family # create rvm gemset 
$ echo "rvm use --create ruby-1.9.2@family" > family/.rvmrc 
$ cd family # install rails 
$ gem install rails # create new rails project 
$ rails new . # version control 

VimleshS

Recording Rule Example 1
================================
# Aggregating up requests per second that has a path label:
- record: instance_path:requests:rate5m
  expr: rate(requests_total{job="myjob"}[5m])

- record: path:requests:rate5m
  expr: sum without (instance)(instance_path:requests:rate5m{job="myjob"})

Recording Rule Example 2

VimleshS

# Add field
echo '{"hello": "world"}' | jq --arg foo bar '. + {foo: $foo}'
# {
#   "hello": "world",
#   "foo": "bar"
# }

# Override field value
echo '{"hello": "world"}' | jq --arg foo bar '. + {hello: $foo}'
{

VimleshS

Checkout a new working branch

 git checkout -b <branchname>

Make Changes

 git add
 git commit -m "description of changes"

Sync with remote

VimleshS

An Ansible summary

Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)

Configuration file

intro_configuration.html

First one found from of

VimleshS

Based on these:

https://wiki.jenkins-ci.org/display/JENKINS/Installing+Jenkins+on+Ubuntu
http://www.intridea.com/blog/2013/5/21/howto-install-setup-jenkins-ci-for-rails-projects

Setup an EC2 instance with Ubuntu (14.04)
Open port 8080

Install Jenkins
wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -

VimleshS

Go program interaction

Example of how to use stdout and stdin from other programs in golang

Requires go

Run

go run parentprocess.go

VimleshS

abc	1	2	3
def	4	5	6
ga	7	9	10
hij	1	5	99