Roberto Fernandez ctwoprod

Kafka Topics

List existing topics

bin/kafka-topics.sh --zookeeper localhost:2181 --list

Describe a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

... wait a minute ...

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

Squashing Git Commits

The easy and flexible way

This method avoids merge conflicts if you have periodically pulled master into your branch. It also gives you the opportunity to squash into more than 1 commit, or to re-arrange your code into completely different commits (e.g. if you ended up working on three different features but the commits were not consecutive).

Note: You cannot use this method if you intend to open a pull request to merge your feature branch. This method requires committing directly to master.

Switch to the master branch and make sure you are up to date:

Python3 Virtualenv Setup

Requirements

Python 3
Pip 3

$ brew install python3

Install MySQL on macOS Sierra

This procedure explains how to install MySQL using Homebrew on macOS Sierra 10.12

Install Homebrew

Installing Homebrew is effortless, open Terminal and enter :
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Note: Homebrew will download and install Command Line Tools for Xcode 8.0 as part of the installation process.

Install MySQL

At this time of writing, Homebrew has MySQL version 5.7.15 as default formulae in its main repository :

	pipeline {
	// run on jenkins nodes tha has java 8 label
	agent { label 'java8' }
	// global env variables
	environment {
	EMAIL_RECIPIENTS = '[email protected]'
	}
	stages {

	stage('Build with unit testing') {

	======
	Videos
	======

	DevOps

	What is DevOps? by Rackspace - Really great introduction to DevOps
	https://www.youtube.com/watch?v=_I94-tJlovg

	Sanjeev Sharma series on DevOps (great repetition to really get the DevOps concept)

	## Install Jenkins

	$ sudo yum update
	$ sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo
	$ sudo rpm --import http://pkg.jenkins-ci.org/redhat-stable/jenkins-ci.org.key
	$ sudo yum install jenkins
	$ sudo service jenkins start
	$ sudo chkconfig jenkins on

	## Install Docker (Amazon EC2 Container Service)

	package com.elm.mb.rest.filters;

	import java.io.IOException;

	import javax.servlet.FilterChain;
	import javax.servlet.ServletException;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;

	import org.apache.commons.logging.Log;