Monthly Archives: March 2016

How to use yum history to roll back an update

Environment Red Hat Enterprise Linux 6 , 7 yum Issue How to roll back an update using yum in Red Hat Enterprise Linux-6, 7? How to use yum history? Information on best practice to enable easy backout of yum patching Resolution Note: Downgrading a system to minor version (ex: RHEL6.1 to RHEL6.0) is not recommended… Read More »

Hands-free Kafka Replication: A lesson in operational simplicity

Hands-free Kafka Replication: A lesson in operational simplicity by Neha Narkhede July 02, 2015 Neha Narkhede Find me on: LinkedIn Twitter Building operational simplicity into distributed systems, especially for nuanced behaviors, is somewhat of an art and often best achieved after gathering production experience. Apache Kafka’s popularity can be attributed in large part to its… Read More »

Kafka 0.9.0 Documentation

1. Getting Started 1.1 Introduction 1.2 Use Cases 1.3 Quick Start 1.4 Ecosystem 1.5 Upgrading 2. API 2.1 Producer API 2.2 Consumer API 2.2.1 Old High Level Consumer API 2.2.2 Old Simple Consumer API 2.2.3 New Consumer API 3. Configuration 3.1 Broker Configs 3.2 Producer Configs 3.3 Consumer Configs 3.3.1 Old Consumer Configs 3.3.2 New… Read More »

Linux Network Bridge

A bridge is a piece of software used to unite two or more network segments. A bridge behaves like a virtual network switch, working transparently (the other machines do not need to know or care about its existence). Any real devices (e.g. eth0) and virtual devices (e.g. tap0) can be connected to it. This article… Read More »

Spark Standalone Mode

Installing Spark Standalone to a Cluster To install Spark Standalone mode, you simply place a compiled version of Spark on each node on the cluster. You can obtain pre-built versions of Spark with each release or build it yourself. Starting a Cluster Manually You can start a standalone master server by executing: ./sbin/start-master.sh Once started,… Read More »

Get Your Dedicated VPN In Full Business gear.

    According to Gartner, the world’s leading IT research and advisory company, IT outsourcing will be a $335 billion industry by 2019. *|Get Your Dedicated VPN In Full Business gear. |* According to Gartner, the world’s leading IT research and advisory company, IT outsourcing will be a $335 billion industry by 2019. Moreover, a December… Read More »

How To Set Up a Production Elasticsearch Cluster on CentOS 7

Introduction Elasticsearch is a popular open source search server that is used for real-time distributed search and analysis of data. When used for anything other than development, Elasticsearch should be deployed across multiple servers as a cluster, for the best performance, stability, and scalability. This tutorial will show you how to install and configure a… Read More »

How To Set Up a Production Elasticsearch Cluster on Ubuntu 14.04

Introduction Elasticsearch is a popular open source search server that is used for real-time distributed search and analysis of data. When used for anything other than development, Elasticsearch should be deployed across multiple servers as a cluster, for the best performance, stability, and scalability. This tutorial will show you how to install and configure a… Read More »

How To Set Up Basic HTTP Authentication With Nginx on CentOS 7

Introduction Nginx is one of the leading web servers in active use. It and its commercial edition, Nginx Plus, are developed by Nginx, Inc. In this tutorial, you’ll learn how to restrict access to an Nginx-powered website using the HTTP basic authentication method on Ubuntu 14.04. HTTP basic authentication is a simple username and (hashed)… Read More »