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Monitoring Elasticsearch
Monitoring Elasticsearch

Monitoring Elasticsearch:

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Profile Icon Dan Noble Profile Icon Lababidi Profile Icon Agrawal
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Paperback Jul 2016 180 pages 1st Edition
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Profile Icon Dan Noble Profile Icon Lababidi Profile Icon Agrawal
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Paperback Jul 2016 180 pages 1st Edition
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Monitoring Elasticsearch

Chapter 2. Installation and the Requirements for Elasticsearch

The Java Runtime Environment (JRE) is the only requirement to run Elasticsearch.

The official Elasticsearch documentation recommends that you use either Oracle Java 8 (update 20 or later), or Oracle Java 7 (update 55 or later). Once you choose your version of the JRE, we recommend that all your nodes use the same version to maintain compatibility. Using different versions of Java across your cluster or using Java versions earlier than the ones specified here, can lead to data corruption. Once you choose a version of Elasticsearch, all the nodes in your cluster should use the same version.

While it is possible to run Elasticsearch on both Windows and Linux, this book focuses on using it exclusively in a Linux environment. The Elasticsearch documentation is centered on Linux and most of the Elasticsearch community runs the software on Linux. However, there is no reason a production cluster of Elasticsearch cannot run on...

Installing Elasticsearch

At the time of writing this book, Elasticsearch 2.3.2 is the current stable release and Elasticsearch 5 is in alpha testing. For production clusters, we recommend using the 2.3.2 release and quickly updating to the 5 general availability (GA) release once it is available. Note that while Elasticsearch 5 is compatible with indices created in Elasticsearch 2.x, there have also been some API changes and feature deprecations after the 1.x release. Readers should account for these important changes before upgrading. More details on upgrading from 2.x to 5 can be found on the Elastic website at the following URLS:

Notable API changes include the following:

  • Indices from Elasticsearch 1.x must first be upgraded to 2.x before finally moving to version 5
  • The deprecated filtered, or, and and queries were removed in favor of the bool, must, and should...

Configuring an Elasticsearch cluster

This section will cover some basic Elasticsearch configuration in addition to a few changes that will positively impact your cluster's performance.

Most Elasticsearch configuration changes will be applied to elasticsearch.yml. For our installation of Elasticsearch on Ubuntu, this file is located at /etc/elasticsearch/elasticsearch.yml. Elasticsearch internal configuration changes are applied to elasticsearch.yml. Environmental variables can be set in the application's startup script. For our installation of Elasticsearch 2.3.2 on Ubuntu, these files are in the following locations:

  • Internal Configuration is located at

    /etc/elasticsearch/ elasticsearch.yml

  • Environmental Variable Configuration is located at

    /etc/defau lts/elasticsearch

Cluster name

A wonderful thing about Elasticsearch is the ease with which you can build a cluster. Elasticsearch nodes on the same local area network (LAN) will automatically form a cluster with each other if they...

Understanding your cluster

Elasticsearch has many different moving parts, and it can get a little complicated to ensure that everything runs properly. Fortunately, there are some great open source monitoring tools that are available to help you keep tabs on your cluster. This section will cover how to install some of the most popular and useful monitoring tools on your cluster, and the following two chapters will go into these tools in more detail.

Installing Elasticsearch-head

Elasticsearch-head is a simple, free, open source tool that provides a high-level examination of your cluster. It is one of the most useful tools used when administering and monitoring the health of a cluster. Elasticsearch-head only needs to be installed on one node in your cluster. However, we recommend installing it on all nodes for redundancy. It's installed as an Elasticsearch plugin.

If you have an Internet connection, you can install Elasticsearch-head with the Elasticsearch plugin utility, as follows:

sudo...

Cluster requirements

The requirements for your cluster—the number of nodes and the hardware specifications of each node—depend on several factors, including the following:

  • Total volume of data
  • Data ingest rate
  • Average record size
  • Data mapping
  • Types of queries being run
  • System performance requirements

There's no one size fits all formula to determine cluster requirements for a given Elasticsearch use case. The best approach is to meticulously test performance while changing variables, such as shard size, the number of nodes in the cluster, and hardware configurations until an optimal solution is found. This section focuses on high-level guidelines to consider when configuring your cluster.

It's a good idea to run at least three nodes in a production environment and to set data replication to 1, which asks Elasticsearch to maintain one copy of each shard in the cluster. This configuration will ensure that if a node goes down, your cluster won't lose any data.

Elasticsearch...

Summary

This chapter covered Elasticsearch installation, configuration, monitoring tools, and cluster requirements. Tools such as Elasticsearch-head, Bigdesk, and Marvel all lay the groundwork to monitor your cluster and analyze its performance. However, you still have to know what aspects to look for and how to find them. In the next chapter, we will examine Elasticsearch-head and Bigdesk further, and discuss important things to look for in these tools when monitoring an Elasticsearch cluster.

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Key benefits

  • •Understand common performance and reliability pitfalls in ElasticSearch
  • •Use popular monitoring tools such as ElasticSearch-head, BigDesk, Marvel, Kibana, and more
  • •This is a step-by-step guide with lots of case studies on solving real-world ElasticSearch cluster issues

Description

ElasticSearch is a distributed search server similar to Apache Solr with a focus on large datasets, a schema-less setup, and high availability. This schema-free architecture allows ElasticSearch to index and search unstructured content, making it perfectly suited for both small projects and large big data warehouses with petabytes of unstructured data. This book is your toolkit to teach you how to keep your cluster in good health, and show you how to diagnose and treat unexpected issues along the way. You will start by getting introduced to ElasticSearch, and look at some common performance issues that pop up when using the system. You will then see how to install and configure ElasticSearch and the ElasticSearch monitoring plugins. Then, you will proceed to install and use the Marvel dashboard to monitor ElasticSearch. You will find out how to troubleshoot some of the common performance and reliability issues that come up when using ElasticSearch. Finally, you will analyze your cluster’s historical performance, and get to know how to get to the bottom of and recover from system failures. This book will guide you through several monitoring tools, and utilizes real-world cases and dilemmas faced when using ElasticSearch, showing you how to solve them simply, quickly, and cleanly.

Who is this book for?

This book is for developers and system administrators who use ElasticSearch in a wide range of capacities. Prior knowledge of ElasticSearch and related technologies would be helpful, but is not necessary.

What you will learn

  • •Explore your cluster with ElasticSearch-head and BigDesk
  • •Access the underlying data of the ElasticSearch monitoring plugins using the ElasticSearch API
  • •Analyze your cluster's performance with Marvel
  • •Troubleshoot some of the common performance and reliability issues that come up when using ElasticSearch
  • •Analyze a cluster's historical performance, and get to the bottom of and recover from system failures
  • •Use and install various other tools and plugins such as Kibana and Kopf, which is helpful to monitor ElasticSearch
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Publication date : Jul 27, 2016
Length: 180 pages
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Language : English
ISBN-13 : 9781784397807
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Table of Contents

9 Chapters
1. Introduction to Monitoring Elasticsearch Chevron down icon Chevron up icon
2. Installation and the Requirements for Elasticsearch Chevron down icon Chevron up icon
3. Elasticsearch-head and Bigdesk Chevron down icon Chevron up icon
4. Marvel Dashboard Chevron down icon Chevron up icon
5. System Monitoring Chevron down icon Chevron up icon
6. Troubleshooting Performance and Reliability Issues Chevron down icon Chevron up icon
7. Node Failure and Post-Mortem Analysis Chevron down icon Chevron up icon
8. Looking Forward Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
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