Ashrith Mekala ashrithr

Sample TCP server-client implementation using openssl in ruby

Use the wrapper shell script to create ssl certificates ./openssl.sh -newca, enter the details and the required files will be generated to ./demoCA dir from where you run the script. cacert.pem will be your ssl-certificate and private/cakey.pem will be your ssl-key

Start SSL Server using:

ruby ssl_server.rb 9099 demoCA/cacert.pem demoCA/private/cakey.pem

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

Producers send messages to brokers
Consumers read messages from brokers
Messages are sent to a topic

Installing ruby using rvm:

# On RedHat based systems
yum install curl

# On Debian based systems
apt-get install curl

Why I love zsh

Smarter completion. A few examples:
context sensitive -- if you have file "name1" and directory "name2", "cd nam<TAB>" completes to "name2/"
"tar xf <TAB>" completes to tarballs only. "unrar x <TAB>" completes to RARs only. etc.
rsync / scp completion: "rsync host:anything/<TAB>" shows you files on host under anything/
also works with rsync:// URLs
SSH host completion from ~/.ssh/config & ~/.ssh/known_hosts
lots of other smart completions: Rake tasks, git commands & SHAs, dpkg packages, dash-options for most commands, etc etc.

	#!/bin/bash
	#
	# Licensed to the Apache Software Foundation (ASF) under one or more
	# contributor license agreements. See the NOTICE file distributed with
	# this work for additional information regarding copyright ownership.
	# The ASF licenses this file to You under the Apache License, Version 2.0
	# (the "License"); you may not use this file except in compliance with
	# the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0

	[user]
	name = ashrithr
	email = [email protected]
	[color]
	ui = auto
	[credential]
	helper = osxkeychain
	[core]
	excludesfile = /Users/ashrith/.gitignore_global
	[difftool "sourcetree"]

	class String
	def undent
	gsub(/^.{#{slice(/^ +/).length}}/, '')
	end
	end

	#Usage:
	test = <<-EOS.undent
	testing unindent
	..another line

	function sshable () {
	[[ $# -ne 3 ]] && { echo "requires instance, ssh_user, ssh_key arguments"; return; }
	instance=$1
	ssh_user=$2
	ssh_key=$3
	command=$(ssh -t -t -o ConnectTimeout=2 -o StrictHostKeyChecking=no -o BatchMode=yes -o UserKnownHostsFile=/dev/null -p 22 -i ${ssh_key} ${ssh_user}@${instance} "echo" &>/dev/null)
	until $command; do
	echo -e ".\c"
	done
	echo ""

	#!/usr/bin/env bash

	# -
	# Script to install standalone puppet
	# -

	OS=`uname -s`
	REV=`uname -r`
	MACH=`uname -m`

	require 'openssl'

	#
	# Program to demonstrate Certificate Signing Request using openssl
	#

	# Create a new key
	def gen_key(name)
	key = OpenSSL::PKey::RSA.new 1024
	file = File.new name, "w"