apache

How to analyze and interpret Apache Log

How to analyze and interpret Apache Webserver Log

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Apache web servers can generate a lot of logs. These logs contain information such as the HTTP requests that Apache has handled and responded to, and other activities that are specific to Apache. Analyzing the logs is an important part of administering Apache and ensuring that it runs as expected.

In this guide, we’ll go over the different logging options present in Apache and how to interpret this log data. You’ll learn how to analyze the logs that Apache produces and how to configure the logging settings to give you the most relevant data about what Apache is doing.

In this tutorial you will learn:

  • Configure and understand Apache webserver logging
  • What are Apache log levels
  • How to interpret Apache log formatting and its meaning
  • What are the most common Apache log configuration files
  • How to extend logging configuration to include forensic data

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How to benchmark Webserver with Apache Bench

How to benchmark Webserver with Apache Bench

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Apache Bench is a tool used to measure the performance of a web server. Despite having “Apache” in its name, it can actually be used to test any type of web server. In this tutorial, we’ll go over the steps to use Apache Bench and how to interpret its report about a web server’s performance.

Apache Bench works by sending varying amounts of HTTP requests to the web server and recording the response times. It can tell you how much congestion the server can handle before it gets overwhelmed and performance diminishes.

In this tutorial you will learn:

  • How to install Apache Bench
  • How to use Apache Bench
  • How to interpret Apache Bench Results

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Installation of Apache Web Server on RHEL 8 / CentOS 8 using dnf command

How to install Apache on RHEL 8 / CentOS 8 Linux

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The Apache HTTP Server or simply Apache, is free and open-source cross-platform web server software developed and maintained by Apache Software Foundation. Apache is a easy to learn and configure web server providing an ability to host websites mainly via HTTP or HTTPS protocols. Under RHEL 8 / CentOS 8 system Apache webserver is know under name httpd.

In this tutorial you will learn:

  • How to install Apache webserver
  • How to enable and start Apache webserver
  • How to open firewall HTTP port 80
  • How to create basic same website

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HDFS Architecture

How to install Hadoop on RHEL 8 / CentOS 8 Linux

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Apache Hadoop is an open source framework used for distributed storage as well as distributed processing of big data on clusters of computers which runs on commodity hardwares. Hadoop stores data in Hadoop Distributed File System (HDFS) and the processing of these data is done using MapReduce. YARN provides API for requesting and allocating resource in the Hadoop cluster.

The Apache Hadoop framework is composed of the following modules:

  • Hadoop Common
  • Hadoop Distributed File System (HDFS)
  • YARN
  • MapReduce

This article explains how to install Hadoop Version 2 on RHEL 8 or CentOS 8. We will install HDFS (Namenode and Datanode), YARN, MapReduce on the single node cluster in Pseudo Distributed Mode which is distributed simulation on a single machine. Each Hadoop daemon such as hdfs, yarn, mapreduce etc. will run as a separate/individual java process.

In this tutorial you will learn:

  • How to add users for Hadoop Environment
  • How to install and configure the Oracle JDK
  • How to configure passwordless SSH
  • How to install Hadoop and configure necessary related xml files
  • How to start the Hadoop Cluster
  • How to access NameNode and ResourceManager Web UI

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Examples page served by Apache Tomcat

How to install apache tomcat on Linux RHEL 8 / CentOS 8

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In this tutorial we will learn how to install Apache Tomcat 8 application container to RHEL 8 / CentOS 8. We will be using the zip package available to download from the Apache Tomcat website. As this package will not handle setting up the environment, we will create it from the command line.

In this tutorial you will learn:

  • How to install Apache Tomcat from zip file
  • How to create the environment for the Tomcat server from command line
  • How to add basic service file to systemd
  • How to enable autostart, start and stop the Tomcat server
  • How to verify Tomcat is reachable

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Tomcat providing the examples application

How to set up Apache webserver proxy in front of Apache Tomcat on Red Hat Linux

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Objective

Our objective is to setup Apache httpd to work as a proxy in front of the Apache Tomcat application container.

Operating System and Software Versions

  • Operating system: Red Hat Enterprise Linux 7.5
  • Software: Apache httpd, Apache Tomcat

Requirements

Privileged access to the system

Difficulty

EASY

Conventions

  • # – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
  • $ – given linux commands to be executed as a regular non-privileged user

Introduction

Using Apache httpd as a proxy to an Apache Tomcat application container is a common setup. It comes with many use cases, the most trivial is serving static content from httpd, while providing services implementing heavy business logic from an application written in Java that resides in the Tomcat container.

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